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AbstractHydrotrupes chinensis Nilsson, 2003 described from the holotype collected in Anhui Province, China, is newly recorded from three localities in Guangdong Province, ca. 750?km southwest from the type locality. The species seems to inhabit hygropetric habitats exclusively, with diurnal larvae and nocturnal adults hidden under stones or in cracks in rock during the day; when disturbed, the adults readily jumped off the rock surface. The adult is redescribed. The larvae are described and illustrated for the first time, with detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi. Whereas similar morphologically to the Nearctic endemic Hydrotrupes palpalis Sharp, 1882, the first instar larva of H. chinensis distinguishes by presence of six lamellae clypeales, two additional spine-like setae both on the last abdominal segment and urogomphomere 1, and the strongly developed egg bursters. 相似文献
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Verónica Núñez 《Molluscan research.》2017,37(1):17-30
Potamolithus Pilsbry &; Rush, 1896 is a species-rich genus, endemic to South America, with many of its species considered Vulnerable due to a restricted distribution; half of them are called into question, since they are known only from their shells. The purpose of this article is to describe the anatomy of P. paranensis (Pilsbry, 1911) and P. simplex (Pilsbry, 1911) from the Argentinean Misiones province, and to evaluate the value of anatomical features in this genus. These two species differ in penis morphology and pigmentation, ctenidium length, and relative position of the opening of the pallial oviduct, seminal receptacle and bursa copulatrix. Consequently, it appears that anatomical data could help solve taxonomic conflicts that are currently unresolved by shell morphology alone. 相似文献
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A new species of Pelomus Reiss, 1989 (Diptera: Chironomidae: Chironominae), P. sophiae sp. n., is described and figured as male, pupa and larva. Diagnoses for male and pupa of the genus are emended. The larvae, reared in the laboratory to obtain all life stages, were collected on bottom sand of reservoir and ponds, in southeast Brazil. 相似文献
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Adult Taeniopteryx nebulosa (Linnaeus, 1758) and Perlodes microcephalus (Pictet, 1833) emerge late winter to early spring in Danish streams. Based on 13 years of study, we have provided new data and discussed little-known aspects of biology of these two species. Taeniopteryx nebulosa male deposits a spermatophore on the female gonopore. Both species are poor fliers and seek high posts for take-off, where they thermoregulate by basking in a pre-flight sun posture for heating flight muscles. Oviposition flight is erratic and short. The females skim back to land. Taeniopteryx nebulosa eggs drift a long distance as single eggs before adhering to vegetation. Perlodes microcephalus eggs drift a short distance as intact eggpackets before they fasten and disintegrate on the bottom. Perlodes microcephalus females select oviposition sites on or close to upstream a riffle. This is critical in ensuring that eggs fasten on stable gravel and stone bottoms. The fast recolonisation of P. microcephalus in Danish streams following restoration measures indicates efficient dispersal ability despite poor flight performance. Adults of both species adhere to clothes, feather and fur. Taeniopteryx nebulosa tarsomeres have many hooked setae, P. microcephalus tarsomeres have some hooked setae and a dense cover of microtrichia. They may disperse by hitchhiking on birds and mammals. 相似文献
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AbstractTwo new species of the genus Esakia Lundblad, 1933 are described, both from Borneo: Esakia borneensis sp. n. and E. mazzoldii sp. n. For the first time, E. johorensis Cheng, 1966 is reported from Sumatra; E. hungerfordi Miyamoto, 1967 from Sarawak and Sabah; and E. lundbladi Cheng, 1966 from Thailand (Narathiwat Province). The taxonomy of E. kuiterti Hungerford and Matsuda, 1958 and E. hungerfordi is discussed. Esakia hungerfordi, previously considered by Polhemus (1992) as a synonym of E. fernandoi, is treated here as a separate species from the latter. Easkia kuiterti, which was also synonymised with E. ventidioides Lundlblad, 1933 by Polhemus (1992), is considered valid species. http://zoobank.org/urn:lsid:zoobank.org:pub:F6E94274-2305-4096-9186-2D799124E2FA 相似文献
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Mainstem‐tributary linkages by mayfly migration help sustain salmonids in a warming river network 下载免费PDF全文
Animal migrations can link ecosystems across space. We discovered an aquatic insect that migrates between a river mainstem and its tributaries, and provides an important trophic subsidy for tributary predators. A mayfly, Ephemerella maculata, rears in a warm, sunlit productive river mainstem, then migrates as adults to cool, shaded unproductive tributaries where they oviposit and die. This migration tripled insect flux into a tributary for 1 month in summer. A manipulative field experiment showed that this E. maculata subsidy nearly tripled the growth of the young of the year steelhead trout (Oncorhynchus mykiss) in the recipient tributary over the summer months, and was more important than terrestrial invertebrate subsidies, which have been considered the primary food source for predators in small, forested creeks. By delivering food subsidies from productive but warming river mainstems to cool but food‐limited tributaries, aquatic insect migrations could enhance resilience to cool‐water predators in warming river networks. 相似文献
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Abstract Hydrochus ignicollis Motschulsky, 1860 is recorded from Iran (Gilan Province) for the first time. In addition, new Iranian provincial records are provided for two species: H. nodulifer Reitter, 1897 (Zanjan Province) and H. farsicus Hidalgo-Galiana, Jäch, and Ribera, 2010 (Kohgiluyeh and Boyer-Ahmad Province). Photographs of the habitus, the male genitalia and the habitat of H. ignicollis are provided. 相似文献
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Yoandri S. Megna Andrea Lorena García-Hernández Rodulfo Ospina-Torres Carlos Prieto Michael Balke 《水生昆虫》2019,40(2):99-122
The Colombian species of the diving beetle genus Liodessus Guignot, 1939 are revised. Liodessus bogotensis Guignot, 1953 is re-described. Three higher altitude species are new to science: Liodessus azufralis sp. n., L. quillacinga sp. n. and L. quimbaya sp. n. We also introduce two new subspecies, L. quillacinga cochaensis ssp. n. and L. quillacinga cumbalis ssp. n. We delineate the species using morphological structures such as male genital structure and beetle size, shape and colour pattern. Mitochondrial cox1 sequence data provided an additional character source. All the new species occur on higher altitudes above 2700 m and were collected in shallow, exposed peatland pools and puddles, mostly in Páramo. Liodessus obscurellus (LeConte, 1852), not yet recorded from Colombia, is included into the key due to its presence in nearby Costa Rica and Ecuador. The known distribution and habitat preferences of each species are outlined briefly. 相似文献
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We explored mechanisms determining the upper altitudinal limit of ephemeropterans from two different genera: Leptohyphes Eaton, 1882 (Leptohyphidae) and Lachlania Hagen, 1868 (Oligoneuriidae). For this, we (1) surveyed the two taxa in 165 stream sites along a wide altitudinal gradient; (2) sampled benthic fauna at short altitudinal intervals along a stream, from 2780 to 3150 m above sea level; (3) collected adults at the lowest and highest sites; and (4) transplanted nymphs from the lowest to the highest study site in our stream to determine survival over time. Densities of the two taxa declined gradually with altitude and both disappeared between 2950 and 3080 m a.s.l. The upper altitudinal limit in the stream seemed to be most closely related to mean oxygen saturation, temperature, and current velocity. Adults were collected where the nymphs were found, but not at the upstream site where the nymphs were absent, implying limited upstream dispersal of adults and some of the altitudinal constraint lying at the adult stage. Short-term survival of transplanted nymphs was lower than that of controls, suggesting that the distribution was limited at the juvenile stage, and that at least some of the altitudinal constraint is related to the abiotic stream environment. 相似文献
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Hugo Alejandro Álvarez José Manuel Tierno de Figueroa Jorge Alejandro Cebada-Ruiz 《水生昆虫》2019,40(2):137-145
The expression of aggression in Megaloptera has received little attention, specifically for the adults of the subfamily Corydalinae. Among the New World species of Corydalinae, it is not known if aggression is triggered and expressed in the same way. Since two genera, Corydalus Latreille, 1802 and Platyneuromus Weele, 1909 have different courtship strategies, the effect of the social environment in the expression of aggression in two species of those genera, Corydalus magnus Contreras-Ramos, 1998 and Platyneuromus soror (Hagen, 1861), is examined here and compared with the known data in Corydalus bidenticulatus Contreras-Ramos, 1998. Our results suggest that the triggering of aggressive behaviours in the three species is similar. The decision of whether or not to fight is affected by their social environment: a male is aggressive against other males only when a female is present. Furthermore, the intensity of aggression does not differ among the three species. The behavioural observations support the idea that the mandibles of Corydalus males are used as weapons in male-male competition and during the courtship, but the post-ocular flanges of P. soror males are not involved in male-male competition (they use their short mandibles to bite). Conversely, data show that such a feature might act as a signal trait for female choice. 相似文献
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Chi-Feng Lee 《水生昆虫》2013,35(2):165-169
The genus Falsodrupeus Pic, 1949 is redescribed and a new species, F. barclayi sp. nov., is added. The antennae, maxillary and labial palps, and aedeagus are illustrated, and an updated key to the genera of Eubriinae is provided. 相似文献
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François-Marie Gibon 《水生昆虫》2014,36(2):79-92
The genus Cheimacheramus Barnard, 1934 included only three species, one from South Africa and two from Madagascar. Four new Malagasy species are described herein: Cheimacheramus akandi sp. n., Cheimacheramus barnardi sp. n. and Cheimacheramus anjojorobensis sp. n. from the Anjojorobe Forest, Cheimacheramus madecassus sp. n. from the Lakato Forest and the Marojejy National Park. Diagnostic characters of the genus and species are discussed and illustrated. In Madagascar, these discoveries confirm the localization of the genus within the eastern evergreen forests.http://zoobank.org/urn:zoobank.org:pub:79472077-04E9-42FA-B55B-9EE291556E60 相似文献
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Phylloicus Müller, 1880 and Banyallarga Navás, 1916 are endemic Neotropical genera of Calamoceratidae. Currently, Phylloicus has 55 extant species, 19 of which are recorded from Brazil, and a fossil species from Dominican amber. In this paper, a new species of Phylloicus is described and illustrated from specimens collected in Amazonas State, Brazil. This new species has peculiar hind wing venation, with vein R4 attached basally to the base of R2+3. Therefore, a modified diagnosis to the genus is presented to include Phylloicus dumasi sp. nov. The new species is somewhat similar to P. paprockii Prather, 2003, but can be distinguished from these and other Phylloicus species by the atypical hind wing venation, uniform colouration, and male genitalia with tergum IX produced posteriorly into two wide lobes. 相似文献
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Carlos Henrique de Vasconcelos Nascimento Rafael Pereira-Silva Iris Gabrielly Arruda dos Santos Gilberto Gonçalves Rodrigues 《水生昆虫》2019,40(2):146-172
New records and distributional notes of Chironomidae (Insecta, Diptera) are provided for four protected areas in the state of Pernambuco, northeastern Brazil. Additionally, we also present new records and update of distributional ranges from Brazil and the Neotropical Region. In total, 810 specimens belonging to 35 genera within the subfamilies Chironominae (22 taxa), Tanypodinae (11 taxa) and Orthocladiinae (2 taxa) were found. The subfamilies Chironominae and Tanypodinae predominated. Axarus Roback, 1980 and the Tanytarsus ortoni-group were recorded for the first time in the state of Pernambuco, while Nanocladius Kieffer, 1913a was recorded for the first time in the Northeast Region of Brazil. Our results make evident how much and where current knowledge of the northeastern Brazil chironomids remains fragmentary. 相似文献
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The larvae of the grooved whirligig beetle Macrogyrus oblongus (Boisduval, 1835) are described and illustrated including detailed morphometric and chaetotaxic analyses of selected structures. Larvae of Macrogyrus Régimbart, 1882 exhibit the characters traditionally recognised as autapomorphies of the Gyrinidae. The first instars bear egg bursters on the parietal, a potential additional autapomorphy. Putative larval autapomorphies of the tribe Dineutini are the presence of additional setae on the mandible, the absence of the seta TR2, and the presence of pore-like additional structures on the ultimate palpomeres. Macrogyrus larvae differ from those of the other known dineutine genera (Andogyrus Ochs, 1924 and Dineutus MacLeay, 1825) in the absence of a neck constriction and in the distal position of the pore LAc. Other useful characters to distinguish genera within Dineutini are the presence or absence of additional setae on the cardo and coxa, and the posterior margin of the lacinia dentate or smooth. 相似文献