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Baltoceratidae
Baltoceratidae is an extinct family of orthoconic cephalopods belonging to the subclass Nautiloidea endemic to what would be Asia, Australia, Europe, North America, and South America during the Ordovician living from about 480–460 mya, existing for approximately .〔(PaleoBiology Database: Baltoceratidae, basic info )〕
==Taxonomy==
Baltoceratidae was named by Kobayashi (1935) and assigned to the Ellesmeroceratida by Flower and Kummel (1950) 〔Flower and Kummel 1950. A Classification of the Nautiloidea, Journal of Paleontology 24(5) 604-616,〕 where it was retained by Unklesbay and Young (1956),〔A. G. Unklesbay and R. S. Young. 1956. Early Ordovician nautiloids from Virginia. Journal of Paleontology 30(3):481-491〕 again by Flower (1964)〔Flower 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda), Memoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro, NM〕
, and by Furnish and Glenister in Teichert et al. (1964).〔Teichert et al 1964, Treatise on Invertebrate Paleontology Part K Mollusca 3, Nautiloidea-Ellesmerocerida by Furnish and Glenister, K129- K153〕 Flower (1964) included the Baltoceratidae in the ellesmeroceratid suborder Ellesmeroceratina.
Further study of baltoceratid interiors, namely regarding the generally thin connecting rings and lack of siphuncular diaphragms, showed they are distinct from the typical ellesmerocerids and belong, as the ancestral group, to the Orthocerida where assigned by Kroger et al. (2007) 〔B. Kröger, M. S. Beresi, and E. Landing. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283〕
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