Quantitative ökologische Analyse eines Rifflagunenareals bei Aqaba (Golf von Aqaba,Rotes Meer)

Following previous investigations on a fringing reef in the Red Sea near Aqaba (Mergner & Schuhmacher, 1974; Mergner & Svoboda, 1977) this paper presents a quantitative analysis of the faunal and floral stock in one of the selected test areas (5×5 m) located in the reef lagoon studied. During the observation period 237 macrobenthic species of 192 genera were found. Species numbers were 22 (algae), 18 (cnidarians), 22 (crustaceans), 113 (molluscs), 27 (echinoderms), 14 (fishes) and 21 (smaller animal taxa including foraminiferans, sponges, turbellarians, polychetes and ascidians). These numbers, though derived from a small and relatively monotonous reef area, exceed by far all data known from comparable reef zones. The ecological conditions as well as habitat preferences, times of occurrence, seasonal abundances, species diversities and dominances of the inhabitants observed in the test area are discussed. Comparisons of the population data of October, 1975 and March, 1976 indicate the influence of the succession, abundance and disappearance of the phytal on the environmental conditions of the mobile fauna, for example molluscs, echinoderms and fishes. The increase of some of its species, especially of juvenile individuals, is remarkable. Within the same period juvenile colonies of some xeniids and the stony coralStylophora pistillata undergo similar seasonal fluctuations; colonies eliminated by grazers or other, unknown circumstances, are replaced by new settlers. Altogether, the faunal and algal stock of this lagoon area can be interpreted as a climax community; its impressive density is apparently the result of a high number of various microhabitats. Each of these ecological niches provides manyfold living spaces for specific communities with different adaptive strategies. The highest number of species plus the highest diversity indices rank mostly among the mobile groups.

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Mit Unterstützung der Deutschen Forschungsgemeinschaft.     

Seasonal monitoring of coral–algae interactions in fringing reefs of the Gulf of Aqaba, Northern Red Sea

This paper presents seasonal in situ monitoring data on benthic coverage and coral–algae interactions in high-latitude fringing reefs of the Northern Red Sea over a period of 19 months. More than 30% of all hermatypic corals were involved in interaction with benthic reef algae during winter compared to 17% during summer, but significant correlation between the occurrence of coral–algae interactions and monitored environmental factors such as temperature and inorganic nutrient availability was not detected. Between 5 and 10-m water depth, the macroalgae Caulerpa serrulata, Peyssonnelia capensis and filamentous turf algae represented almost 100% of the benthic algae involved in interaction with corals. Turf algae were most frequently (between 77 and 90% of all interactions) involved in interactions with hermatypic corals and caused most tissue damage to them. Maximum coral tissue loss of 0.75% day⁻¹ was observed for Acropora-turf algae interaction during fall, while an equilibrium between both groups of organisms appeared during summer. Slow-growing massive corals were more resistant against negative algal influence than fast-growing branching corals. Branching corals of the genus Acropora partly exhibited a newly observed phenotypic plasticity mechanism, by development of a bulge towards the competing organism, when in interaction with algae. These findings may contribute to understand the dynamics of phase shifts in coral reefs by providing seasonally resolved in situ monitoring data on the abundance and the competitive dynamic of coral–algae interactions.     

Transport von Abscisinsäure in Explantaten,Blattstiel- und Internodialsegmenten von Coleus rheneltianus

Zusammenfassung Natürliche und synthetische Abscisinsäure wird in Explantaten, Blattstiel- und Internodialsegmenten von Coleus rheneltianus transportiert.In jüngeren Pflanzenteilen erfolgt der Transport vorwiegend oder ausschließlich basipetal, während in älteren Organteilen auch eine erhebliche akropetale Wanderung stattfindet. Eine Bestimmung der Transportgeschwindigkeit ergab für synthetische Abscisinsäure in älteren Blattstielsegmenten ungefähr 24–36 mm/h.

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Transport of abscisic acid in explants, petiole and internode segments of Coleus rheneltianus

Summary Synthetic or natural abscisic acid isolated from tomato fruits is transported in explants, petiole and internode segments from Coleus rheneltianus.Transport in segments and explants from younger parts (2nd node or internode) is mainly basipetal. In older parts (segments and explants from 5th nodes or internodes) translocation in acropetal direction is nearly of the same order of magnitude as in basipetal direction.The velocity of transport of synthetic absisic acid was investigated in petiole segments from 5th nodes and was found to be approximately 24 to 36 mm/h.

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Herrn Prof. Dr. Hans Söding in Dankbarkeit zum 70. Geburtstag gewidmet.     

Membranpotential von Chlorella fusca in Abhängigkeit von pH-Wert,Temperatur und Belichtung

Summary The dependence on external parameters of the membrane potential of Chlorella fusca (Shihira et Krauss) 211-8b, Göttingen, has been measured in media containing no salt except KCl. Near neutrality the potential is practically independent of pH. The negative potential increases with temperature from-12 mV at 5°CC to-45 mV at 20°, and remains constant thereafter, i.e., at least up to 30°. Upward temperature jumps of 5 degrees cause a fast hyperpolarisation, which is independent in magnitude of the starting temperature. The potential is influenced by illumination, and this effect increases with temperature. The light effect is reduced by 3-(3,4-dichlorophenyl)-1,1-dimethyl urea and practically abolished by carbonyl cyanide-m-chlorophenyl hydrazone.

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Abkürzungen DCMU 3-(3,4-Dichlorphenyl)-1,1-dimethylharnstoff - CCCP Carbonylcyanid-m-chlorphenylhydrazon Herrn Prof. Dr. Otto Hoffmann-Ostenhof zum 60. Geburtstag gewidmet.     

Die Acetoinbildung von Lactobacillus plantarum in Abhängigkeit von Thiamin,Liponsäure,l-Valin und l-Isoleucin

Zusammenfassung Das homofermentative Milchsäurebakterium Lactobacillus plantarum weist während der Glucosevergärung einen zeitweiligen Pyruvatstau von 120 mg/l auf, der durch Thiaminzugabe auf 10–20 mg/l reduziert werden kann. Der hierdurch intensivierte Pyruvatdurchsatz bedingt eine Verdoppelung der Acetoinsynthese, da Thiamin auch Cofaktor der Acetolactat-Synthetase ist. Ein gleichzeitiger Thiamin- und Liponsäurezusatz führt zu einer nochmaligen Verdoppelung der Acetoinausbeute. Liponsäure allein zeigt keinen Einfluß. Eine Erklärung dieses Sachverhaltes bietet die Annahme einer zusätzlichen Entstehung des Acetoins aus Acetyl-CoA zu Diacetyl und dessen Reduktion zu Acetoin. Dazu notwendiges Reduktionsäquivalent könnte die Lipoyl-Dehydrogenase liefern. Die sehr schnellen Konzentrationsveränderungen von Pyruvat und Acetoin nach Thiaminzugabe während der logarithmischen Wachstumsphase lassen eine Aktivierung des oder der Acetoin-synthetisierenden Enzyme wahrscheinlich erscheinen. Valin und Isoleucin beeinflussen die Acetoinsynthese nicht durch Rückkoppelung, sondern nur mittelbar über das Wachstum.

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Acetoin formation by Lactobacillus plantarum dependent on thiamine, lipoic acid, l-valine, and l-isoleucine

Summary During the homolactic fermentation of glucose by Lactobacillus plantarum the concentration of pyruvate rises temporarily to 120 mg/l.By the addition of thiamine, this concentration is reduced to 10–20 mg/l. The subsequently intensified turnover of pyruvate leads to the doubling of acetoin synthesis. This is reasonable since thiamine is a cofactor of the acetohydroxy acid synthetase, too.When thiamine and lipoic acid are added simultaneously, again a doubling of acetoin synthesis occurs, while lipoic acid alone has no effect. This may be explained by an additional synthesis of acetoin via acetyl-CoA to diacetyl and further reduction to acetoin.The rapid changes in the concentrations of pyruvate and acetoin following the addition of thiamine during the logarithmic growth phase may be explained by the activation of one or more of the acetoin synthesizing enzymes.A feedback inhibition of acetoin synthesis by valine and isoleucine was not detected.

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Herrn Prof.Dr.G. Drews, Freiburg, danke ich für anregende Unterstützung dieser Arbeit.     

Die auswirkungen von Kahlschlag und Brand auf dasQuercetum ilicis von Süd-Toskana,Italien

Das in der südtoskanischen Maremma klimatogeneQuercetum ilicis wird in regelmässigen Abständen von etwa 12 Jahren kahlgeschlagen, wodurch tiefgreifende Änderungen in der Vegetation entstehen. Es wird in den ersten zwei Jahren ein Massenauftreten von Therophyten beobachtet und bald darauf eine allmähliche Wiederentwicklung des Waldes, die durch Stockausschläge der kräftigeren Holzarten zustande kommt. Die häufig auftretenden Brände bedingen hingegen das Entstehen desEriceto-Lavanduletum als degradierte Dauergesellschaft. Die vorliegende Arbeit stellt einen Versuch dar, die wichtigsten Momente dieser Sukzession zu beschreiben, u. zw. mit floristischen Angaben und mit der Bearbeitung von Lebensformen, ökologischen Synusien, Schichtung, Verbreitungstypen und Polyploidie.     

Über die Wirkung von Arsenat auf Nitratreduktion,Atmung und Photosynthese von Grünalgen

Summary The effect of sodium arsenate on the metabolism of the green alga,Ankistrodesmus braunii (strain Marburg) increases with increasing arsenate concentration and with decreasing phosphate concentration. Above 10^–4 M arsenate, in a phosphate-free medium of pH 4.1, an increase in respiratory oxygen uptake and inhibition of photosynthesis were observed. At the highest concentration used (5·10^–2 M arsenate), the rate of respiration was about 250% of that of the controls, whereas photosynthesis had dropped to about 20% of the normal value. In addition, arsenate was found to be an inhibitor of the reduction of nitrite in the dark, whereas it does not inhibit the first step of nitrate reduction,i.e. the reaction nitrate nitrite. Therefore, in a solution containing nitrate, addition of arsenate leads to accumulation of nitrite. These results further support the assumption, derived previously from experiments with 2,4-dinitrophenol, that the further reduction of nitrite requires high-energy phosphate, in contrast to the first step of nitrate reduction.

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Mit 8 Textabbildungen     

Das Lamellare Dünn-Dick-Muster der Chloroplasten von Chlamydomonas,Euglena, Fucus,Vaucheria

Summary As supposed in a previous paper, Heitz (1960), the lamellar thin-thick pattern is found in four algae of very different taxonomic position. It is suggested that the presence of thin and thick lamellae as well in the chloroplasts with grana as without grana, is a common, significant characteristic. Perhaps there is a functional difference between the two kinds of lamellae. The thick lamellae in the midst of the two thin lamellae in the Algae (and in the liverwort Anthoceros) are perhaps the precursors of the many thick lamellae in the so called grana of the higher plants.

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Die Arbeit wurde mit Unterstützung durch die Deutsche Forschungsgemeinschaft ausgeführt, der ich ebenso danke wie den technischen Assistentinnen Fräulein Döemer und Fräulein Möschler.     

Die Plastoglobuli von Spinat,ihre Grö\e,Isolierung und Lipochinonzusammensetzung

Zusammenfassung Die Grö\e und HÄufigkeit der osmiophilen Plastoglobuli nimmt mit steigendem Alter der Spinatchloroplasten zu. Die Plastoglobuli besitzen in ganzen oder aufgebrochenen Chloroplasten, in Sedimenten und in isolierter Form die gleiche Grö\enverteilung wiein situ. Es gibt keine Hinweise, da\ beim Ultraschallaufschlu\ ganzer Chloroplasten Plastoglobuli durch Entmischung der Thylakoide entstehen. Beim Zentrifugieren von broken chloroplasts wird nur ein kleiner Teil der Plastoglobuli freigesetzt. Der grö\ere Teil befindet sich mit den Chloroplastenbruchstücken im Sediment.Wie bei anderen Pflanzen enthalten auch die Plastoglobuli von Spinat vorwiegend die lipophilen Plastidenchinone vom Benzochinontyp (Plastochinon 45, Plastohydrochinon,-Tocopherol und-Tocochinon), geringe Mengen an Vitamin K₁ und Spuren an Carotinoiden, jedoch keine Chlorophylle. Zwischen dem Lipochinongehalt der Chloroplasten und der Grö\e und HÄufigkeit der osmiophilen Plastoglobuli besteht eine direkte Korrelation.

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The plastoglobuli of spinach: Their size, isolation, and lipoquinone composition

Summary The size and frequency of the osmiophilic plastoglobuli of spinach chloroplasts increase with increasing age of chloroplasts. The plastoglobuli of whole or broken chloroplasts, of sediments and in the isolated form show the same size distribution asin situ. There is no evidence that plastoglobuli may arise from thylakoid lipids by ultrasonic treatment of whole chloroplasts. During the centrifugation of broken chloroplasts only a small portion of the plastoglobuli is releazed, the greater portion remains in the sediment together with the chloroplast fragments.The plastoglobuli of spinach—like those of other plants—mainly contain the excess plastidquinones of the benzoquinone type (plastoquinone 45, plastoquinol,-tocopherol,-tocoquinone), little vitamin K₁ (a naphthoquinone), traces of carotenoids, but no chlorophylls. The lipoquinone content of spinach chloroplasts increases parallel to the augmentation of the size and frequency of the plastoglobuli.

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Der Deutschen Forschungsgemeinschaft danke ich für ihre Unterstützung und FrÄuleinMargarethe Wirtz für tüchtige technische Mitarbeit.     

Zur morphologie, ökologie und systematik von sphaeroma,europosphaera und jaera

Ohne Zusammenfassung     

Einfluß von Licht,Temperatur und Außenmedium auf das elektrische Verhalten von Acetabularia crenulata

Summary 1. In sea water at 25°C cells of Acetabularia crenulata exhibit a resting potential (RP) of-170 mV between cytoplasm and external medium. At temperatures below 10°C, or upon addition of 10^-3m dinitrophenol in darkness, the cell shows a second steady potential (RP) of about-70 mV. Among the cations of sea water, i.e. K⁺, Na⁺, Mg⁺⁺, only K⁺ was found to affect RP and RP. If the ionic strength of the medium is reduced by addition of isotonic mannitol solution, RP decreases, while RP is not influenced. RP is explained as a potassium diffusion potential, while for the existence of RP an electrogenic chloride pump is inferred which is driven by ATP of the photo- or oxidative phosphorylation (system X).-2. Starting from RP, the current-voltage relationship consists of two linear portions for inward (R _e ) and outward current (R _a ), respectively, merging at RP (Fig. 3). Presumably they represent potassium conductances. For a given cell, the expression RT/F ln R _e /R _a yields a value which fits the RP of the cell (Fig. 20).-3. Starting from RP, a N-shaped current-voltage relationship was obtained for depolarisation (Fig. 3). The deviation from the potassium conductance is supposed to be due to the shunt of the potassium channel and the system X (voltage-dependent resistance). An electric circuit diagram was derived from voltage and current clamp experiments (Fig. 21); the elements of the circuit were tentatively analogized with cell functions.-4. Action potentials of about 120 mV, lasting from 30 to 300 sec may arise spontaneously. They can be triggered by lowering the temperature or depolarisation (voltage clamp, current clamp, light-off-cf. Figs. 2,11). The mechanism of the action potential can be derived from the properties of the chloride pump. Action currents were recorded upon different depolarizing steps by voltage clamp to yield current-coltage curves at different times after stimulation (Fig. 13).-5. Pulses of white light shift the potential off RP: light-on elicits a small depolarisation, light-off a large transient hyperpolarisation. The primary event of this response is a change of current (Fig. 19), the voltage change being its consequence. This result is interpreted on the basis of the circuit diagram.

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Abkürzungen AP Aktionspotential - RP stabiles Potential bei ca.-170 mV - RP stabiles Potential bei ca.-70 mV Dissertation der Math.-Nat. Fakultät der Universität Tübingen.     

Über die Blattbildung der Ophioglossaceen,insbesondere von Ophioglossum

Ohne ZusammenfassungMit 16 Textabbildungen.     

Der Einfluss von Wirkstoffen,von Röntgen- und Elektronenstrahlen auf die Cambiumtätigkeit vonBeta vulgaris

Ohne ZusammenfassungMit 10 Textabbildungen.Dissertation der Naturwissenschaftlichen Fakultät der Universität Erlangen.Herrn Prof. Dr.J. Schwemmle, der die Anregung zu der vorliegenden Arbeit gab, danke ich für das Interesse und die Förderung, die er meiner Arbeit zuteil werden ließ. Mein Dank gilt ferner den Herren Dr.F. Wachsmann und Dr.Breuer, die mir bei der Bestrahlung der Objekte behilflich waren.     

Der Einfluß von Temperatur,Futter, Größe und Herkunft auf die sexuelle Differenzierung von Glasaalen(Anguilla anguilla)

The effects of rearing and feeding conditions, as well as of body size and origin on sexual differentiation have been examined in elvers collected on the Atlantik coast (River Ems) and in the Tyrrhenian Sea. Raised at 17°, 20°, 23°, 26° or 29° C and at constant photoperiod, the elvers received either commercial fish food or cod roe. Eels from the Tyrrhenian Sea mostly developed into males. To some extent, at temperatures optimal for growth (26° C) and feeding a cod-roe diet, a shift of sex ratio in favour of females was observed in Atlantic eels. The results obtained contradict those ofFidora (1951), who, rearing elvers in ponds, found the percentage of male eels to be positively correlated with increasing stock density. Although in the present study, stock density was 200 times higher than inFidora's experiments, the percentage of females was much higher than that of males. The results obtained supportBellini's (1907) findings that big elvers preferentially develop into females, but small elvers into males. Irrespective of elvers' origin, water temperature and diet, the onset of sexual differentiation dependends upon attaining a certain body length (15–25 cm), but not on age. Whereas under natural conditions females are supposed to grow faster than males, under the conditions tested the males grew faster than the females. It is concluded, that, in addition to genetic factors, various environmental factors may influence sex determination in eels.     

Der Einfluß von Amytal, 2,4-Dinitrophenol und Phenazinmethosulfat auf die Bacteriochlorophyllsynthese in anaeroben Kulturen von Rhodospirillum rubrum

Zusammenfassung Durch die Hemmstoffe Amytal (5·10^-3 m), 2,4-Dinitrophenol (1,25·10^-4 m) und Phenazinmethosulfat (10^-6 m) wird die Bacteriochlorophyllbildung bei Rhodospirillum rubrum unter anaeroben Bedingungen im Dunkeln völlig verhindert. Der Abbau der Speicherstoffe (Kohlenhydrate) verläuft genau so rasch oder schneller als ohne Hemmstoffe.Die Hemmung der Bacteriochlorophyllsynthese unter anaeroben Bedingungen im Licht ist vom spezifischen Anfangsbacteriochlorophyllgehalt der Zellen abhängig. Nach einer semiaeroben oder anaeroben Vorkultur der Bakterien, bei der der Photosyntheseapparat in gewissem Umfange ausgebildet wird, ist der Einfluß der genannten Hemmstoffe auf die Bacteriochlorophyllsynthese und das Wachstum im Licht deutlich geringer als in pigmentlosen Zellen.Bei einem spezifischen Bacteriochlorophyllgehalt von 1,5 g/mg Protein kann bereits eine Nettozunahme der Kohlenhydrate bei anaerober Kultur im Licht erfolgen.

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The influence of amytal, 2,4-Dinitrophenol, and Phenazinemethosulfate on the biosynthesis of bacteriochlorophyll in anaerobic cultures of Rhodospirillum rubrum

Summary Amytal (ethylisoamylbarbituric acid; 5·10^-3 m), 2,4-Dinitrophenol (1.25·10^-4 m), and Phenazinemethosulfate (10^-6 m) completely inhibits the synthesis of bacteriochlorophyll in anaerobic cultures in the dark. The degradation of carbohydrates runs in the same rate or quicker than without inhibitors.The rate of inhibition of bacteriochlorophyll synthesis under anaerobic conditions in the light is dependent from the specific content of bacteriochlorophyll in the cells on the beginning of culture. After a semiaerobic or anaerobic preculture some bacteriochlorophyll is present and the influence of the inhibitors on the bacteriochlorophyllsynthesis and the growth rate is diminished. If the specific bacteriochlorophyll content is 1,5 g/mg protein or higher a netto increase of the carbohydrates in anaerobic light cultures takes place.

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Abkürzungen im Text BChl Bacteriochlorophyll - 2,4-DNP 2,4-Dinitrophenol - PMS Phenazinmethosulfat     

Quantitative Analyse von Korallengemeinschaften des Sanganeb-Atolls (mittleres Rotes Meer). II. Vergleich mit einem Riffareal bei Aqaba (nördliches Rotes Meer) am Nordrande des indopazifischen Riffgürtels

Quantitative studies of coral communities in the central and northern Red Sea were designed for comparison of the community structure in both areas. The central Red Sea provides reef-building Scleractinia and reef-inhabiting Alcyonaria with optimal temperature conditions, whereas the north tip of the Gulf of Aqaba (29°30 N) represents the northernmost outpost of coral reefs in the Indian Ocean. It is generally assumed that coral diversity decreases towards the margins of the global reef-belt. In the Red Sea, generic diversity of hermatypic Scleractinia slightly decreases from the central to the northern part (51 : 48 genera); but cnidarian species abundance (species number per 25 m² area) was found to increase from 62 to 98 species and the Shannon-Wiener diversity index increased from 2.58 to 3.67 with regard to colony number. The mean colony size was 189 cm² at Sanganeb-Atoll, but only 52 cm² at Aqaba. The mean numbers of colonies were inversely related: 662 per 25 m² at Sanganeb-Atoll and 2028 at Aqaba. Uninhabited parts of the studied areas amounted to 47 % at Sanganeb-Atoll and to 56 % at Aqaba. The community structure of the studied areas indicates that occasional perturbations prevent the progress of the community towards a low-diversity equilibrium state. Since severe hydrodynamic damage is extremely rare in 10 m depth, major disturbances may occur by sedimentation, by the interference of grazers (e. g.Diadema setosum) and due to overgrowth by space-competitors (mainly soft corals). These events are to be regarded as throwbacks in the process of monopolization of the area by well adapted species. Recovery from such perturbations (i.e. recolonization of dead areas) obviously takes place at different velocities in the northern and central Red Sea, for the mean water temperature at Aqaba is 5 °C lower than in the central Red Sea. Hence the process of taking over a given space by a few species proceeds further in the central Red Sea than at its northern end. The increase in diversity per area towards high latitudes is comparable to that with depth. It is concluded from the great number of species at Aqaba that these reefs mark the northernmost outpost of the Indian Ocean only geographically but not ecophysiologically; they would occur at even higher latitudes, if the Gulf of Aqaba extended farther north.     

Nucleoside,XLV1) Synthese von 8-β-D-Ribofuranosyl-Leukopterin

Abstract

Model reactions with 2-methylthiopteridin-4,7(3H,8H)-diones (3-5) and 4-benzyloxy-8-methyl-2-thiopteridin-7(8H)-one (11) showed that peracid oxidations lead to the corresponding 2-methylsulfonyl-6-oxo derivatives 8, 9, 10 and 12. The structurally analogous pteridine-N-8-ribosides 19-21 and 26 revealed the same behaviour, which allowed the synthesis of 8-β-D-ribofuranosylleu-copterin (30) from 4-benzyloxy-8-(2,3,5-tri-O-benzoyl-β-D-ribofu-ranosyl)-2-methylthio-pteridi-7(8H)-one (26) via the intermediates 27-29. The newly synthesized compounds have been characterized by elemental analysis and UV spectra.     

Kiemen und Hämolymphkreislauf von Phyllidia pulitzeri (Gastropoda,Opisthobranchia, Doridacea)

Zusammenfassung Ziel dieser Studie ist die anatomische und histologische Beschreibung der Atmungsorgane und des Kreislaufes von Phyllidia pulitzeri Pruvot-Fol, 1962. Der an Hand von Schnittserien rekonstruierte Kreislauf, insbesondere der Kiemenkreislauf, und die ventralen Kiemenblättchen werden mit denen typischer Doridacea (Archidoris und Corambe) verglichen.Innerhalb der Phyllidiidae behält der Sinus lateralis seine Funktion bei: Er leitet die durch Hautatmung mit Sauerstoff angereicherte Hämolymphe aus dem Notum in das Atrium. Ebenfalls leitet er die Hämolymphe aus den ventralen Kiemenblättchen in das Herz. Die für die kiementragenden Doridacea so typischen caudo-medialen Eingänge der afferenten und efferenten Kiemengefäße in das Atrium fehlen bei den Phyllidiidae.Die Lage der Atmungsorgane, die Art der Vervielfältigung der Kiemenblättchen, das Fehlen einer Raphe und eines unabhängigen Kiemenkreislaufes, die Vergrößerung des peripheren Körperkreislaufes in die ventralen Blättchen deuten darauf hin, daß die Kiemen von Phyllidia pulitzeri sekundäre Ausstülpungen des ventralen Notumepithels darstellen.Da das Herz und die Sinus laterales bilateral symmetrisch auf der Eingeweidemasse liegen, scheinen das Kreislaufsystem und die Atmungsorgane apomorphe Merkmale zu sein, die innerhalb der Doridacea nur einmal entstanden.

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Respiratory organs and vascular system of Phyllidia pulitzeri (Gastropoda, Opisthobranchia, Doridacea)

Summary The anatomical and histological details of the respiratory organs and the vascular system of Phyllidia pulitzeri Pruvot-Fol, 1962, are described. The vascular system, especially of the ventral gill leaflets, is reconstructed and compared with that of typical Doridacea (Archidoris and Corambe).Within the Phyllidiidae the sinus lateralis maintains its function of returning the blood from the notum to the atrium. This blood is oxygenated by cutaneous respiration. The sinus lateralis also returns the blood from the ventral leaflets. The caudo-medial entrances of the afferent and efferent branchial vessels into the atrium, so typical of all gill-bearing Doridacea, are missing in the Phyllidiidae.The position of the respiratory organs, the mode of multiplication of the gill leaflets, the lack of the raphe and of an independent branchial vascular system, and the enlargement of the peripheral vascular system into ventral leaflets show that the gills of Phyllidia pulitzeri are secondary specializations of the epithelium of the ventral notum.The heart and the sinus laterales lying bilaterally symmetrical on the viscera, the vascular system, and the respiratory organs seem to be apomorphic features that evolved only once within the Doridacea.