Brevicoceratidae

The Upper Silurian torticone Foersteoceras turbinatum, from Sweet (1964).

Belongs within: Oncoceratidae.

A morphologically very diverse family of oncocerid cephalopods that lived from the Middle Silurian to the Upper Devonian, the Brevicoceratidae included breviconic, gyroconic and torticonic forms. Sweet (1964) derived the family from the oncoceratid genus Oonoceras.

Characters (from Sweet 1964): Exogastric (rarely endogastric) brevicones, gyrocones and torticones, tending to develop irregular, vestigial actinosiphonate deposits and subtriangular transverse section.

<==Brevicoceratidae [Mitroceratinae, Naedyceratidae]
    |--Brevicoceras Flower 1938 S64
    |    `--*B. casteri Flower 1938 S64
    |--Anglicornus Flower & Caster 1935 S64
    |    `--*A. anneliesae Flower & Caster 1935 S64
    |--Blastocerina Flower 1940 [incl. Blastoceras Flower & Caster 1935 non Fitzinger 1860] S64
    |    `--*B. cylindrostoma (Flower & Caster 1935) [=Blastoceras cylindrostomum] S64
    |--Eleusoceras Flower 1938 S64
    |    `--*E. nicholsi Flower 1938 S64
    |--Exocyrtoceras Flower 1938 S64
    |    `--*E. exoticum Flower 1938 S64
    |--Foersteoceras Ruedemann 1925 S64
    |    `--*F. turbinatum (Hall 1852) [=Trochoceras turbinatum] S64
    |--Gonionaedyceras Flower 1945 S64
    |    `--*G. pandion (Hall 1876) [=Trochoceras pandion] S64
    |--Gyronaedyceras Flower 1945 S64
    |    `--*G. validum (Hall 1876) [=Gyroceras validum] S64
    |--Micronoceras Flower 1938 S64
    |    `--*M. delphicolum Flower 1938 S64
    |--Mitroceras Hyatt 1894 [=Trochoceras Hall 1852 non Barrande 1848, Tachoceras (l. c.)] S64
    |    `--*M. gebhardi (Hall 1852) [=*Trochoceras gebhardi] S64
    |--Ovoceras Flower 1936 S64
    |    `--*O. oviforme (Hall 1860) [=Gomphoceras (Apioceras) oviforme] S64
    |--Oxygonioceras Foerste 1925 S64
    |    `--*O. oxynotum (Barrande 1865) [=Trochoceras oxynotum] S64
    |--Stereotoceras Flower 1950 S64
    |    `--*S. oppletum Flower 1950 S64
    |--Verticoceras Flower 1936 S64
    |    `--*V. erectum Flower 1936 S64
    |--Wissenbachia Foerste 1926 S64
    |    `--*W. orthogaster (Sandberger & Sandberger 1852) [=Phragmoceras orthogaster] S64
    |--Aletoceras Flower 1938 S64
    |    |--*A. gracile Flower 1938 S64
    |    `--A. amphoroides Flower 1938 P68
    `--Naedyceras Hyatt 1884 [incl. Gyroceras Owen 1844] S64
         |--*N. eugenium (Hall 1861) [=Trochoceras eugenium] S64
         |--‘Gyroceras’ duplicostatum Whitfield 1878 P68
         `--‘Gyroceras’ logani Meek 1868 P68

*Type species of generic name indicated

REFERENCES

[P68] Purnell, L. R. 1968. Catalog of the Type Specimens of Invertebrate Fossils. Part I: Paleozoic Cephalopoda. United States National Museum Bulletin 262: 1-198.

[S64] Sweet, W. C. 1964. Nautiloidea – Oncocerida. In Treatise on Invertebrate Paleontology pt. K. Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea (R. C. Moore, ed.) pp. K277-K319. The Geological Society of America and the University of Kansas Press.