''Biloclymenia'' is a genus in the ammonoid order
Clymeniida
Clymeniida is an order of ammonoid cephalopods from the Upper Devonian characterized by having an unusual dorsal siphuncle. They measured about in diameter and are most common in Europe, North Africa, and South China but are known from North ...
which is characterized by a dorsal retrosiphonitic siphuncle with long adapically pointing septal necks.
The shell of shell ''Biloclymenia'' is thickly discoidal, more or less involute, with a moderately wide umbilicus, lightly thickened sides and rounded venter. The shell is surface smooth, covered merely by growth lines which form two salients. The ventral lobe of the suture is wide and divided in two with a secondary lobe at the top of median saddle. Additional sutural elements are two umbilical, an inner lateral and a dorsal lobe.
The
Treatise on Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...
(Part L 1957) includes ''Biloclymenia'' in the
Wocklumariidae which is derived from
Hexaclymeniidae. Saunders ''et al''(1999) expands upon this theme and puts ''Bilocymenia'' and
Biloclymeniidae
''Biloclymeniidae'' was an extinct family of ammonites that existed during the Devonian.
References
Devonian ammonites
Late Devonian first appearances
Late Devonian animals
Famennian extinctions
Cyrtoclymeniina
Ammonite families
{{Clym ...
in the Sellaclymeniaceae (suborder Gonioclymeniina), indicates the following phylogenetic progression beginning with ''Hexaclymenia''.
''Hexaclymenia'' (Hexaclymeniidae) --> ''Uraloclymenia'' (Miroclymeniidae) --> ''Kiaclymenia'' (Biloclymeniidae) --> ''Bioloclymenia''.
References
;Notes
;Web links
Goniat - ''Biloclymenia'' Entry* Saunders, Work, and. Nikolaeva 1999
Evolution of Complexity in Paleozoic Ammonoid Sutures, Supplementary material. Science Magazine;Bibliography
* Treatise on Invertebrate Paleontology, Part L (Mollusca 4, Cephalopoda Ammoidea) Geological Soc. of America and University of Kansas Press. 1957.
Late Devonian ammonites
Famennian life
Famennian genus first appearances
Cyrtoclymeniina
Ammonite genera
{{Clymeniida-stub