Mucrospiriferinae

Specimens of Eleutherokomma monodi, from Racheboeuf et al. (2004).

Belongs within: Spiriferida.

The Mucrospiriferinae are a group of spiriferid brachiopods from the Devonian and Lower Carboniferous. Certain members of this group have been used as index fossils for sections of the Devonian of North America (Norris 1979).

Characters (from Boucot 1975): Growth lamellae closely spaced, lamellose. Radial fimbriae or spines rarely observed, but present on well preserved specimens. Convex, triangular deltidium of varying size present.

<==Mucrospiriferinae
    |--Mucrospirifer Grabau 1931 [=Lamellispirifer Nalivkin 1937] BJ65
    |    |--*M. mucronatus (Conrad 1841) [=Delthyris mucronata, *Lamellispirifer mucronatus] BJ65
    |    |--M. argentarius N79
    |    |--M. novosibiricus H79
    |    `--M. posterus N79
    `--Eleutherokomma Crickmay 1950 RG04
         |--*E. hamiltoni Crickmay 1950 RG04
         |--E. beardi Crickmay 1950 RG04
         |--E. impennis Crickmay 1950 RG04
         |--E. killeri Crickmay 1950 RG04
         |--E. leducensis Crickmay 1950 RG04
         |--E. legayi (Rigaux 1972) RG04
         |--E. monodi Racheboeuf, Gourvennec et al. 2004 RG04
         |--E. multiplicata (Su 1980) RG04
         |--E. nalivkini (Ljashenko 1973) RG04
         |--E. reidofrdi Crickmay 1950 RG04
         `--E. zarecznyi (Gürich 1903) RG04

*Type species of generic name indicated

REFERENCES

Boucot, A. J. 1975. Evolution and Extinction Rate Controls. Elsevier.

[BJ65] Boucot, A. J., J. G. Johnson, C. W. Pitrat & R. D. Staton. 1965. Spiriferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt H. Brachiopoda vol. 2 pp. H632–H728. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas Press: Lawrence (Kansas).

[H79] House, M. R. 1979. Devonian in the Eastern Hemisphere. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A183–A217. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[N79] Norris, A. W. 1979. Devonian in the Western Hemisphere. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A218–A253. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[RG04] Racheboeuf, P. R., R. Gourvennec, M. Deynoux & D. Brice. 2004. The Devonian of the Hodh area (Islamic Republic of Mauritania): paleontology and stratigraphy. Journal of Paleontology 78 (1): 98–110.