. Early Devonian fishes from Utah : Arthrodira . Fig. 87. Simblaspis cachensis, cranial roof, slightly restored from type, PF 504 (X 3/2). The lateral line canals of the cranial roof are arranged in general as in other Arctolepida, but certain canals or pit lines rarely seen in this group are indicated in the type of S. cachensis (fig. 86, A). The profundus canal( = premarginal canal of Bryant, 1934, p. 137), which is prominent in Bryantolepis (fig. 105, C, pfc) and sometimes encoun- tered in Kujdanowiaspis (Stensio, 1945, p. 50), is indicated in S. cachensis (fig. 105, D, pfc) by a short groo
. Early Devonian fishes from Utah : Arthrodira . Fig. 87. Simblaspis cachensis, cranial roof, slightly restored from type, PF 504 (X 3/2). The lateral line canals of the cranial roof are arranged in general as in other Arctolepida, but certain canals or pit lines rarely seen in this group are indicated in the type of S. cachensis (fig. 86, A). The profundus canal( = premarginal canal of Bryant, 1934, p. 137), which is prominent in Bryantolepis (fig. 105, C, pfc) and sometimes encoun- tered in Kujdanowiaspis (Stensio, 1945, p. 50), is indicated in S. cachensis (fig. 105, D, pfc) by a short groove and pits on the post- orbital immediately anterior to the infraorbital canal, as well as by scattered pits postero-lateral to the end of the supraorbital canal on the preorbital. The middle and posterior pit lines (fig. 105, D, mp, pp) are indicated by short grooves posterior to the termination of the central canal in the middle of the central; these lines are seen also in Aethaspis, Kujdanowiaspis, and Actinolepis. On the paranuchal a short, transverse groove anterior to the opening of the endolympha- tic duct indicates the posterior end of the posterior pit line (fig. 105, D, pp), while a similar groove posterior to the endolymphatic duct represents part of the supratemporal commissure (fig. 105, D, stc);
Size: 2368px × 2111px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectfishesfossil
