摘要:

Over 2000 specimens of pycnogonid from deep‐sea collections made in the northeastern Atlantic Ocean by IOS and SMBA between 1971 and 1994 have been analysed. Thirty‐five species were identified, two being new to science,viz Nymphon akanthochoerosand an unnamedAnoplodactylusspecies. The deep‐sea Pycnogonida of the northeastern Atlantic are reviewed using these data and records from the literature. Keys are presented for the six families represented by more than one species. The pycnogonid fauna of this area is characterized particularly byParanymphon spinosumandColossendeis clavata, with other dominant species includingColossendeisspecies, notablyC. macenima, andNymphon laterospinum, Anoplodactylus typhlopsandA. arnaudae.Of the 54 species recorded below 200 m in the northeastern Atlantic, available evidence suggests that nine are ‘endemic’. Relative distributions of the other species are discussed. A distinct change in the pycnogonid fauna with depth was found at around 1400 m. There is latitudinal separation of species groupings, shown most conspicuously by the shallower wate

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1995.tb02325.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

The abdominal lateral line system in Trichoptera, consisting of filaments and lamellae with associated primary and secondary setae, was studied in larvae and pupae of 70 genera representing 26 families. Filaments are slender, generally bifid, tubular extensions of the cuticle that together form a fringe on the lateral abdominal surface of larvae and pupae of many but not all families of case‐making Trichoptera (Integripalpia). Larvae and pupae of the Annulipalpia and Spicipalpia lack a lateral fringe of bifid filaments, but single filaments occur in larvae of a few unrelated genera. A lateral fringe may help in regulating the flow of water which is maintained through the case by abdominal undulation. Lamellae occur only in larvae of the Integripalpia, where they are variously distributed among families and genera, and probably have a sensory function. Three types of lamellae are recognized: forked, serrate and single. Filaments and lamellae have significant taxonomic value, and their patterns of occurrence raise questions about the phylogeny of Trichopter

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1995.tb02326.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Most geophilomorph centipedes have segmental clusters of exocrine glands whose opening pores are arranged in more or less well‐defined sternal pore areas. We describe here the cuticular structures forming and/or accompanying the gland openings on the sternites and the shape of the pore areas along the body axis in representatives of most geophilomorph families. The cuticular ring around the pore may exhibit either of two forms. In Himantariidae (Himantarium) and in Dignathodontidae (Henia) the ring looks like a continuous ribbon with a visible suture, whereas in the representatives of the remaining families no suture is seen. As to the distribution of the pores on ventral surface of the body, we record the presence of pores on the last leg‐bearing segment ofClinopodes flavidus, whereas that segment was described as poreless in all geophilomorphs. We also provide a taxonomic survey of shape and distribution of pore areas in the individual families, where the pore areas may take very different shapes that we regard as transformational homologues. As for the segmental distribution of sternal pore areas, there is a considerable amount of complexity along the trunk of geophilomorph centipedes, in contrast to the apparently uniform trunk struct

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1995.tb02327.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY