Biology:Biloclymenia

Short description: Genus of molluscs (fossil)

{{Automatic taxobox | fossil_range = {{fossil range|Famennian|ref=<ref name="Sepkoski Ceph">"". 

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.

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.

Wikidata ☰ Q4913569 entry