Baltoceratidae

Belongs within: Orthoceratia.

The Lower to Middle Ordovician Baltoceratidae were a family of relatively large orthoconic early cephalopods.

Characters (from Furnish & Glenister 1964): Smooth, longiconic orthocones with moderately large marginal siphuncle, orthochoanitic septal necks and thin homogenous connecting rings.

Baltoceratidae [Cochlioceratidae]K93
    |--Murrayoceras Foerste 1926FG64
    |    `--*M. murrayi (Billings 1857) [=Orthoceras murrayi]FG64
    |--Ogygoceras Ulrich, Foerste et al. 1944FG64
    |    `--*O. gracile Ulrich, Foerste et al. 1944FG64
    |--CartersocerasK93
    |    |--C. noveboracense Flower 1952K93
    |    `--C. shideleri Flower 1964K93
    |--Cochlioceras Eichwald 1860 [incl. Baltoceras Holm 1897]FG64
    |    |--*C. avus (Eichwald 1857) [=Orthoceras avus]FG64
    |    `--C. burchardiiFG64 [=Baltoceras burchardiS64]
    `--Protobaltoceras Troedsson 1937FG64
         |--P. holmiCT83
         `--P. quruqenseCT83

*Type species of generic name indicated

References

[CT83] Chen J.-Y. & C. Teichert. 1983. Cambrian Cephalopoda of China. Palaeontographica Abteilung A: Paläozoologie—Stratigraphie 181 (1–3): 1–102.

[FG64] Furnish, W. M., & B. F. Glenister. 1964. Nautiloidea—Ellesmerocerida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt K. Mollusca 3. Cephalopoda—General Features—Endoceratoidea—Actinoceratoidea—Nautiloidea—Bactritoidea pp. K129–K159. The Geological Society of America and the University of Kansas Press.

[K93] King, A. H. 1993. Mollusca: Cephalopoda (Nautiloidea). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 169–188. Chapman & Hall: London.

[S64] Sweet, W. C. 1964. Nautiloidea—Orthocerida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt K. Mollusca 3. Cephalopoda—General Features—Endoceratoidea—Actinoceratoidea—Nautiloidea—Bactritoidea pp. K216–K261. The Geological Society of America and the University of Kansas Press.