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Euomphalopterus liratus
Taxonomy
Bathmopterus liratus was named by Kirk (1928). Its type specimen is USNM 72671, a shell, and it is a 3D body fossil. Its type locality is Kirk locality 993, which is in a Gorstian/Ludfordian carbonate limestone in the Willoughby Limestone Formation of Alaska. It is the type species of Bathmopterus.
It was recombined as Euomphalopterus liratus by Knight et al. (1960), Rohr and Blodgett (2001) and Wagner (2023).
It was recombined as Euomphalopterus liratus by Knight et al. (1960), Rohr and Blodgett (2001) and Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Bathmopterus liratus Kirk pp. 1-4 fig. 1 |
| 1941 | Bathmopterus liratus Knight pp. 49 - 51 figs. Plate 78, figure 2 |
| 1960 | Euomphalopterus liratus Knight et al. |
| 2001 | Euomphalopterus liratus Rohr and Blodgett |
| 2023 | Euomphalopterus liratus Wagner p. 4015 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Euomphalopterus liratus Kirk 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Rather large, relatively low, widely phaneromphalous, trochiform gastropods with a wide, frill-like expansion or exaggerated notch-keel from the periphery of the whorls; whorl profile flattened above where the whorl surface is covered by the frill of the previous whorl, gently arched and sloping gently outward from the usually broken outer edge of the frill of the previous whorl to the base of the frill of the whorl to which it belongs, strongly though not angularly concave at the base of the upper side of the frill which droops somewhat from the horizontal at first and then curves upward; sutures covered by the previous whorl, or, more accurately, formed by the fusion of the whorl to the frill above it; nucleus unknown; base concave on the lower side between the evenly arched convex base of the frill and the similarly arched base of the whorl proper which turns evenly into the wide umbilicus; umbilical sutures moderately deep; columellar and parietal lips not well known; characters shown by the outer shell layers of the outer lip above the frill not known, the margin of the lip below the frill leaving the outer edge of the frill with moderately strong backward obliquity to the base of the whorl where it turns gradually to a less obliquity with gentle forward concavity until within the umbilicus the obliquity is slightly forward; the anterior edge of the frill seemingly bearing a deep channel which is periodically cut off behind by partitions as the anterior margin of the frill advances through growth, the partitions, formed of the inner shell substance, with their interspaces when seen in their long extension in section simulating lines of growth curving obliquely forward from the base of the frill to its outer edge with gentle forward convexity and with an angular relationship to the true lines of growth on the surface of the frill, the partitions continuous with laminae of the probably nacreous inner shell substance which, when exposed because of removal of the external shell layers from the outer face o f the whorl, show a sinuous backward curvature reflecting an internal channel of unknown significance in the inner shell layers; ornamentation other than fine lines of growth on the base of the shell unknown; shell thin, of two different layers. The holotype must have measured about 38 mm. in height, allowing for breakage, 85 mm. in width across the (restored) frill, and has a pleural angle of about 104 degrees. |