摘要:

The harpacticoid copepod genusLongipediaClaus is revised and all species where material is available for study are redescribed. The differences between species often depend upon a balance of rather subtle characters and it is pointed out that attention to such fine detail is proving to be crucial in harpacticoid taxonomy. The genus as now revised includes ten species. A further four species whose descriptions are inadequate are placedincertae sedisin the genus.L. roseaSars is considered to be anomen dubium

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1980.tb00850.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

New finds of extremely well preserved skeletons of two rhipidistian crossopterygians,Panderichthys rhombolepis(Gross) andLaccognathus panderiGross, in the Gauja beds (Upper Devonian of Latvia) make possible nearly complete reconstructions of these fishes, and amplify our knowledge of the morphology of the two main orders of Rhipidistia, the Osteolepidida and Holoprvchiida.Panderichthys rhambolepisis distinguished from other osteolepids by consolidation of the bones of the skull roof and cheek; a single attachment surface between the scapulocoracoid and cleithrum; unusual vertebrae; partial fusion of the distal elements in the endoskeleton of the pectoral fin; and the absence of scutes at the bases of the fins.P. rhombolepismay represent a new order of Rhipidistia.L. panderi(litters from known holoptychiids only in details. One unusual feature is the presence of a single large external narial opening, limited posteriorly by a previously unknown bone, the prelachrvinal.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1980.tb00851.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY