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1.
Falcón-Hidalgo B Forrellat-Barrios A Carrillo Farnés O Ubieta Hernández K 《Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology》2011,158(2):136-141
The variation of activity of some digestive enzymes was studied in three age groups of two freshwater endemic fishes from Cuba: Limia vittata and Gambusia punctata. Trypsin, chymotrypsin and amylase activities showed a different pattern between both species. Trypsin and chymotrypsin activity increased with the age of fishes, while amylase activity decreased. The highest activity of trypsin and chymotrypsin was registered in G. punctata while the highest amylase activity was detected in L. vittata. Zymograms revealed proteases with molecular masses similar to trypsin and chymotrypsin reported for other fish species. Amylase electrophoresis showed the presence of this enzyme; in L. vittata amylase zymograms showed two bands with molecular masses of 175 and 100 kDa and in G. punctata four bands of 175, 100, 46 and 30 kDa respectively were found. The activity of the digestive enzymes can be used as an effective indicator of the feeding habits and the development of the digestive tracts in L. vittata and G. punctata. 相似文献
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Two new nematode species, Beaninema nayaritense n. gen., n. sp. and Rhabdochona xiphophori n. sp., are described on the basis of the specimens recovered from the gall bladder and intestine of 2 fishes, Cichlasoma beani (Jordan) (Cichlidae, Perciformes) and Xiphophorus sp. (Poeciliidae, Cyprinodontiformes), respectively, from Mexico. The monotypic genus Beaninema differs from other rhabdochonid genera mainly in the presence of large conical teeth in the middle of the prostom. Rhabdochona xiphophori is characterized mainly by a unique structure of the prostom (presence of 6 anterior teeth; dorsal and ventral teeth unusually broad, with 2 lateral horns) and the shape of the deirids (bifurcated, with markedly long base). 相似文献
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The following 3 new species of Procamallanus (Spirocamallanus) are described from the intestines of freshwater fishes in Mexico, all belonging to the morphological group characterized by the presence of wide caudal alae, 3 pairs of subventral preanal papillae, and unequal spicules in the male: Procamallanus (Spirocamallanus) jaliscensis n. sp. (type host: Agonostomus monticola) and Procamallanus (Spirocamallanus) gobiomori n. sp. (hosts: Gobiomorus maculatus [type host], Gobiomorus polylepis and Eleotris picta) from 2 rivers in Jalisco State, western Mexico, and Procamallanus (Spirocamallanus) mexicanus n. sp. (type host: Cichlasoma geddesi) from Xalapa District, Veracruz State (Gulf of Mexico region), southeastern Mexico. Procamallanus jaliscensis is characterized by the length of the spicules (606-900 microm and 282-354 microm), number (15-16) of spiral ridges in the buccal capsule, and the digit-like protrusion with 1 terminal cuticular spike on the female tail; P. mexicanus by the length of the spicules (456-480 microm and 231-233 microm), number (10-12) of spiral ridges in the capsule, and the shape of the female tail (conical with a suddenly narrowed distal part, without any terminal spikes); and P. gobiomori by the length of spicules (318-348 microm and 156-192 microm), number (8-10) of spiral ridges and by the digit-like protrusion with 2 terminal cuticular spikes on the female tail. 相似文献
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Paracreptotrema heterandriae n. sp. (Trematoda: Allocreadiidae) is described from the intestine of the freshwater fish Heterandria bimaculata (Teleostei: Poeciliidae) from the upper basin of Río La Antigua, in Veracruz, Mexico. The new species is distinguished from the 3 others in the Paracreptotrema Choudhury, Pérez-Ponce de León, Brooks, and Daverdin, 2006 , mainly by having a feeble membranous cirrus sac containing an uncoiled seminal vesicle, instead of a well-developed muscular cirrus sac that encloses coiled seminal vesicle, pars prostatica, and ejaculatory duct as in the previously 3 nominal species. Moreover, eggs of the new species are larger than all others ([measurements in micrometers] eggs of P. heterandriae n. sp. 72.5 [70-75] × 40 [35-41]; P. blancoi 55.4 [52.5-62.5] × 38.5 [32.5-42.5]; P. mendezi 46 × 37; P. profundulusi 57 [52-60] × 27.8 [25-30]). 相似文献
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Variation in heat-shock proteins among species of desert fishes (Poeciliidae, Poeciliopsis) 总被引:4,自引:0,他引:4
Analysis of the heat-shock proteins (hsps) of six closely related species
of Poeciliopsis demonstrated the existence of biochemical diversity in the
hsp100, hsp70, hsp60, and hsp30 protein families among species. Each
species expressed five to seven hsp70-related isoforms. Constitutive 70-kD
isoforms were identical among species, but four different patterns of
heat-inducible isoforms were seen in these six species. Members of the
hsp70 family of molecular chaperones are included among the most highly
conserved proteins known, and the possibility of variation in hsp70 among
closely related species has rarely been addressed. The hsp30 family is
known to be less conserved than the hsp70 family, and, as expected, the
Poeciliopsis hsp30 patterns showed more variation. Most of the hsp30
isoforms characteristic of a particular species were unique to that
species. Hsp100 and hsp60 were identical in five of the species, but
alternate isoforms were found in P. monacha. The small size and limited
geographical distribution of the P. monacha population have probably
contributed to the uniqueness of the monacha pattern. Two of the species
were shown to acquire thermotolerance, the ability to withstand normally
lethal temperatures when subjected to a gradual temperature increase.
Rapid-heating protocols commonly used to establish critical thermal maxima
of organisms do not include this inducible component of thermoresistance
and therefore do not adequately assess an organism's capacity to withstand
thermal stress.
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Sinosciapus liuaesp. n. is newly described from Taiwan. The genus Sinosciapus is discussed and a key to the three known Oriental species is provided. 相似文献
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CRAIG J. HAYWARD 《Zoologica scripta》1996,25(3):203-213
Five species of diplectanids are described or redescribed on the basis of sclerotised parts, from a survey of 26 species of Sillaginidae in the Indo-west Pacific. Diplectanum sillagonum Tripathi is widespread, and is recorded on Sillago sihama from tropical Australia north to Hong Kong and west to India, as well as on S. vincenti (in India) and S. attenuata (Persian Gulf). Diplectanum blairense Gupta & Khanna infects S. sihama and S. indica and is sympatric with D. sillagonum over some of its range (Hong Kong to India and south to Bali). Diplectanum flagritubus Nagibina is synonymised with D. blairense. Diplectanum puriense Tripathi is redescribed from S. chondropus in western Thailand, but was not found on specimens of its type host, Sillaginopsis panijus from the Bay of Bengal. Monoplectanum youngi sp. n. is described from Sillago analis, S. ciliata, S. sihama, S. parvisquamis, S. lutea and S. attenuata and is more widespread than D. sillagonum , extending into subtropical waters in Australia. Monoplectanum australe Young infects S. maculata and S. burrus , and appears to be endemic to Australia. The diagnosis of Monoplectanum , until now monotypic, is emended, the genus is unlikely to contain more new species on sillaginid fishes, and its two species probably share a common ancestor with D. blairense. Parasitological evidence favours a close relationship between Sillaginidae and Sciaenidae. 相似文献
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《Journal of bryology》2013,35(2):95-97
AbstractThe new species Omphalanthus baracoensis, from the Yunque de Baracoa plateau, southeastern Cuba, is described and illustrated. The species is related to the widely distributed Omphalanthus filiformis, but differs in the presence of a large tooth at the lobule apex. 相似文献
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This study describes a new species of Pomphorhynchus collected from Percilia gillissi Girard, 1855 from the Za?artu canal, between the sister basins of the Itata and Laja rivers, in central Chile. Pomphorhynchus moyanoi n. sp. is characterized by an asymmetrical, well-differentiated subspherical bulb and 12-14 longitudinal rows of 13-14 hooks; the third and the fourth hook in each row are stout. Among South American species, P. moyanoi n. sp. shows some similarities to the Chilean species P. yamagutii Schmidt & Hugghins, 1973, but it differs in having a longer neck, larger bulb, and different proboscis armature arrangement. Pomphorhynchus moyanoi n. sp. differs from P. patagonicus Ortubay, Ubeda, Semenas & Kennedy 1991, in the bulb shape (protuberances), number of rows, fourth hook size and basal hook size. Pomphorhynchus moyanoi n. sp. also differs from P. sphaericus in the arrangement of hooks (number of rows and hooks per row), length and width of the proboscis, neck width, and symmetry of the bulb. 相似文献
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María Cristina Martínez-Habibe Douglas C. Daly Jacqueline Pérez-Camacho Pedro Herrera-Oliver 《Brittonia》2013,65(1):62-65
A revision of Bursera in the Greater Antilles has revealed the first new species of the genus to be described from the Caribbean in almost 45 years. Bursera gibarensis is known only from coastal scrub on dogtooth limestone near Gibara in Holguín Province. 相似文献
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Three species of Michotamia are recorded from China. Of these Michotamia aurata (Fabricius, 1794) was previously reported from Hainan and Taiwan. Michotamia assamensis Joseph & Parui, 1995 is recorded from China and Laos for the first time, and Michotamia yunnanensissp. n., is described and figured. A key to the known species from China is provided. A new name, Michotamia subnigra, is given to Michotamia nigra Scarbrough & Hill, 2000, which is preoccupied by Michotamia nigra (Meijere, 1911). 相似文献
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Trichaptum imbricatum, T. perenne and T. podocarpi are three new species from China. They are described, illustrated and compared in this paper with similar species. Trichaptum imbricatum is unique in its imbricate basidiocarps, white to cream hymenophores, small and regular pores, and scattered and thin-walled
cystidia. Trichaptum perenne differs from other species in the genus in its perennial and pileate habit, its large pores and entire dissepiments, and
oblong, ellipsoid basidiospores. Trichaptum podocarpi is distinguished in having totally resupinate basidiocarps, distinctly long cystidia, and in its habitat on Podocarpus. A key to species of Trichaptum occurring in China is provided; statistical variations of spore dimensions for each species are included in the key. 相似文献
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A checklist of 29 brachypterous species in the tenebrionid tribe Stenochiini is given for China and neighboring countries. A new species is described and illustrated under the name of Strongylium liangi
sp. n. (CHINA: Yunnan). Also, some new distribution data is provided for S. claudum (Gebien, 1914), and a distribution map of all Strongylium species in the checklist is presented. 相似文献
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A total of eleven species of tardigrades from Taiwan are reported in this article. They belong to two classes, three orders, four families, and ten genera. Ten species are new records for Taiwan and one is new to science. Doryphoribius taiwanus sp. nov. is similar to Dor. mariae , but differs from it by larger body size, by conspicuous tubercles on the lateral side and dorsal sides of the body, by lacking gibbosities and undulations, by a narrower buccal tube, and by longer claws. 相似文献