Puneet Varma (Editor)

Tarphyceras

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Kingdom
  
Animalia

Class
  
Cephalopoda

Order
  
Tarphycerida

Rank
  
Genus

Phylum
  
Mollusca

Subclass
  
Nautiloidea

Family
  
Tarphyceratidae

Similar
  
Michelinoceras, Endoceras, Nautiloid, Orthoceras

Tarphyeras is a genus of tarphyceratid with whorls rounded in cross section, having a deeply impressed dorsum and a ventral to subcentral siphuncle, known from the Lower Ord (U Canad) of North America. It differs from Campbelloceras in that Campbelloceras is only slightly impressed, from Centrotarphyceras in that Centrotarphyceras is subquadrate and has a central siphuncle, and from Trocholites in that although Trocholites is subcircular in cross section, the siphuncle is subdorsal.

Taphyceras may be derived from Campbelloceras through development of tighter coiling and a deeper impression along with a smaller siphuncle that may be further offset from the venter.

Tarphyceras was named by Hyatt in 1894.

References

Tarphyceras Wikipedia