Biloclymenia
Encyclopedia
Biloclymenia is a genus in the ammonoid order Clymeniida
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
(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 in the Sellaclymeniaceae (suborder Gonioclymeniina), indicates the following phylogenetic progression beginning with Hexaclymenia.
Hexaclymenia (Hexaclymeniidae) --> Uraloclymenia (Miroclymeniidae) --> Kiaclymenia (Biloclymeniidae) --> Bioloclymenia.
Clymeniida
The Clymeniida constitute a unique order of ammonoid cephalods from the Upper Devonian characterized by having an unusual dorsal siphuncle. They measured about 4 cm in diameter and are restricted to Europe, North Africa, and possibly Australia....
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
Treatise on Invertebrate Paleontology
The Treatise on Invertebrate Paleontology published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and...
(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 in the Sellaclymeniaceae (suborder Gonioclymeniina), indicates the following phylogenetic progression beginning with Hexaclymenia.
Hexaclymenia (Hexaclymeniidae) --> Uraloclymenia (Miroclymeniidae) --> Kiaclymenia (Biloclymeniidae) --> Bioloclymenia.