Sphenodiscus sp.

LANDMAN, NEIL H., JOHNSON, RALPH O. & EDWARDS, LUCY E., 2004, Cephalopods from the Cretaceous / Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina, American Museum Novitates 3454 (1), pp. 1-64 : 29

publication ID	https://doi.org/ 10.1206/0003-0082(2004)454<0001:CFTTBI>2.0.CO;2
persistent identifier	https://treatment.plazi.org/id/03BF87D3-5A63-AB12-2672-F136D34AFD81
treatment provided by	Carolina
scientific name	Sphenodiscus sp.
status

Treatment

Sphenodiscus sp.

Figure 10K–O

MATERIAL: There are seven specimens: AMNH 49413 View Materials , 49415 View Materials , 49416 View Materials , 49418 View Materials , 49419 View Materials , and 50757, and USNM 522937 View Materials from AMNH loc. 3252 from the Severn Formation , Kent County, Maryland .

DESCRIPTION: AMNH 49415 and 49416 are ventral pieces of body chambers (fig. 10L– O). The outer flanks converge to a relatively acute venter. There are no swellings on the flanks. AMNH 49413, 49418, and 49419 are worn pieces of large phragmocones (fig. 10K). USNM 522937 (not illustrated) is a piece of the venter of a body chamber 45.5 mm long.

DISCUSSION: These specimens are too fragmentary for specific identification. However, they do not show any evidence of tubercles, suggesting kinship with Sphenodiscus lobatus .

OCCURRENCE: Severn Formation, Kent County, Maryland .

SUBORDER ANCYLOCERATINA WIEDMANN, 1966

SUPERFAMILY TURRILITACEAE GILL, 1871 View in CoL

FAMILY BACULITIDAE GILL, 1871 View in CoL