148


Journal of Paleontology 92(2):146–156


Figure 1. Generalized map of Nebraska and Iowa showing the approximate locations of the quarries and the general stratigraphic section showing the position of the Stark Shale that yielded the coleoid specimens. Several different quarries in the vicinity of Bellevue, Nebraska are noted as producing coleoids, but it is not known which quarry yielded which specimen. Of the coleoids from the Pennsylvanian age coleoid collection from Nebraska and Iowa, only a single specimen has been recovered from Adair County, Iowa.


absolutely certain that the amount of shell material preserved in these specimens is representative of the original shell. There are visual differences in the appearance of the shell that differ from place to place in the same specimen and from specimen to specimen. With this in mind, there is no way to determine how much, if any, shell has been lost from these Stark coleoid spe- cimens during the phosphatization process. It appears that if shell material was originally present, at a minimum it left an impression in the shale. These impressions were used in the systematic identifications and descriptions, but the degree of shell replacement was not used as an important systematic morphologic feature.


Repositories and institutional abbreviations.—The quarries near and in Bellevue that yielded the specimens are the “Old Public Works Quarry” (PWA)—Starkites compressus n. gen. n. sp. (UNSM16562A, B); the La Platte Quarry—Nebraskaconus whitei n. gen. n. sp. (UNSM 8161); and the 36th Street Quarry— Pabianiconus starkensis n. gen. n. sp. (UNSM 16568A). The eight clusters of crushed and fragmented specimens (UNSM 16563–16566, UNSM 16569–16572) are from the “Old Public Works Quarry” (PWA) at Bellevue, Nebraska. The sin- gle coleoid specimen from Iowa, which is identified as Donovaniconus sp. (SUI 62497), is from the Howe Quarry in Adair County. The studied specimens are deposited at the University of


Systematic paleontology Subclass Coleoidea Bather, 1888


Discussion.—As presently defined, none of the presently established Paleozoic coleoid orders will accommodate the new coleoid taxa from the Stark Shale. Therefore, the new fossil coleoids described herein are not assigned to established Paleozoic coleoid orders at this time because an extensive review and possible revision of the diagnostic features of the described coleoid orders from the Paleozoic is necessary.


Genus Nebraskaconus new genus


Type species.—Nebraskaconus whitei new genus new species. Diagnosis.—As for the type species.


Etymology.—After the state of Nebraska where the holotype was collected.


Occurrence.—Specimen UNSM 8161A and B, part and coun- terpart, respectively, was collected by Mr. W.D. “Ted” White at the LaPlatte Quarry near Belleveu, Nebraska from the Stark Shale (Pennsylvanian, Missourian). No additional information is available.


Nebraska State Museum (UNSM prefix), Lincoln, Nebraska and the University of Iowa Museum and fossil repository (SUI prefix), Iowa City, Iowa.


Discussion.—Nebraskaconus whitei n. gen. n. sp. is similar to Starkites compressus n. gen. n. sp., but differs from the latter in


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