Biloclymenia

Biloclymenia is a genus in the ammonoid order Clymeniida which is characterized by a dorsal retrosiphonitic siphuncle with long adapically pointing septal necks.

Biloclymenia
Temporal range:
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Clymeniida
Family: †Biloclymeniidae
Genus: †Biloclymenia
Schindewolf, 1923
Species[2]
  • B. aktubensis
  • B. australis
  • B. bilobata
  • B. dubia
  • B. nebulosa

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
  1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. "Paleobiology Database - Biloclymenia". Retrieved 2014-05-28.
Web Links
Bibliography
  • Treatise on Invertebrate Paleontology, Part L (Mollusca 4, Cephalopoda Ammoidea) Geological Soc. of America and University of Kansas Press. 1957.


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