. Bulletin of the Natural History Museum Zoology. 52 PUGH one from another to form a small gonodendron; female gonophores contain two or more eggs. Remarks. In Pyrostephos vanhoeffeni, the triangular thrust block is best seen on smaller nectophores. On larger, preserved ones it is bent up dorsally (see also Discussion section). Genus BARGMANNIA Totton, 1954 Diagnosis. Pyrostephids with distinctive elongate nectophores. Mature nectophores with large, triangular thrust block; without apical wedge-shaped processes; with extensive ventro-lateral wings. Basic ridge pattern may be augmented by
. Bulletin of the Natural History Museum Zoology. 52 PUGH one from another to form a small gonodendron; female gonophores contain two or more eggs. Remarks. In Pyrostephos vanhoeffeni, the triangular thrust block is best seen on smaller nectophores. On larger, preserved ones it is bent up dorsally (see also Discussion section). Genus BARGMANNIA Totton, 1954 Diagnosis. Pyrostephids with distinctive elongate nectophores. Mature nectophores with large, triangular thrust block; without apical wedge-shaped processes; with extensive ventro-lateral wings. Basic ridge pattern may be augmented by additional ridges branch- ing from apico-laterals. Nectosac basically cylindrical; dorsal and ventral radial canals straight; lateral radial canals arise separately, but in close proximity, from the dorsal canal. Pneumatophore with- out apical pore. Siphosome diffuse; devoid of fully formed dactylozooids. Bracts specifically variable in shape. Each cormidium; with simple tenta- cle-like structure attached to stem midway between successive gastrozooids; with single gonodendron; with four bud-like struc- tures (?vestigial dactylozooids) with sexually dimorphic arrangement. Second tentacle and fifth bud occasionally present proximal to a gastrozooid. REMARKS. The meso-lateral ridges on the nectophores, as referred to in the above diagnosis, are homologous with the vertical lateral ridges, as defined by Pugh and Youngbluth (1988), found on the nectophores of certain agalmatid species. In these latter species these ridges run vertically, or slightly obliquely, between the apico- and infra-lateral ridges, although they may not reach the latter. However, in Bargmannia spp. their arrangement is strikingly differ- ent in that they have a very oblique course; and it is the infra-lateral ridges that may or may not join them basally. For these reasons the term meso-lateral ridges will be used herein. In contrast, the outer of the two branches of the apico-lateral ridges should not be compa
Size: 1154px × 2166px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bhlconsortium, bookc, bookcentury1900, bookcollectionbiodiversity
