''Lyrogoniatitites'' is a neoglyphioceratoidean ammonite, in the order

Goniatitida Goniatids, informally goniatites, are ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniatitids) su ...

, related to genera like '' Alaoceras'', '' Cravenoceras'', '' Dumbarigloria'' and '' Pachylyroceras''.

Description

''Lyrogoniatites'' is similar to '' Neoglyphioceras'', but with broader shell and a smaller number (30-60) of longitudinal lirae and with a ventral (hyponomic) sinus and ventrolateral salients (projections) in all growth stages. As with ''Neoglyphioceras'' the ventral lobe is rather narrow.

Taxonomic relations

W.M. Furnish, et al., 2009, in the revised

Treatise A treatise is a Formality, formal and systematic written discourse on some subject concerned with investigating or exposing the main principles of the subject and its conclusions."mwod:treatise, Treatise." Merriam-Webster Online Dictionary. Acc ...

includes ''Lyrogoniatites'' in the neoglyphioceratid subfamily, Lyrogoniatitinae, along with ''Alaoceras'', ''Caenolyroceras'', ''Dombarigloria'', and ''Pachylyroceras''. D. Korn (2006) on the other hand put ''Lyrogoniatites'' in the neoglyphioceratacean family Cravenoceratidae instead, and in the subfamily Lyrogoniatitinae along with such as ''Caenolyroceras'' and ''Pachylyroceras''. Others, (e.g. GONIAT) also include ''Lyrogoniatites'' in the Cravenoceratidae but in the Cravenoceratinae. The older Treatise (Miller, Furnish, and Schindiwold 1957) puts ''Lyrogoniatites'' along with ''Neoglyphioceras'' in the

Goniatitidae Goniatitidae is one of three families included in the Ammonoidea, ammonoid cephalopod superfamily Goniatitoidea, known from the Lower Mississippian (geology), Mississippian to the Upper Permian. They have sutures that form 8 lobes and characteris ...

and subfamily Neoglyphioceratinae, differentiating the two on the basis of the umbilicus—that of ''Lyrogoniatites'' being moderately large, that of ''Neoglyphioceras'' being narrow.

References

GONIAT online
* W.M. Furnish, et al., 2009, Treatise on Invertebrate Paleontology, Part L (Revised) Vol 2. Paleozoic Ammonoidea ..

* D. Korn, 2006. Paleozoic ammonoid classification

* Miller, Furnish, and Schindewolf, 1957. Treatise on Invertebrate Paleontology, Part L, Ammonoidea. * Saunders, Work, and Nikolaeva, 1999. Evolution of Complexity in Paleozoic Ammonoid Sutures, Supplementary Material

Mississippian ammonites Goniatitida genera Fossils of Kazakhstan Ammonites of Asia Cravenoceratidae {{Goniatitida-stub