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Ceratopea medfraensis
Taxonomy
Helicotoma medfraensis was named by Rohr and Blodgett (1988). Its type specimen is USNM 416183, a shell, and it is a 3D body fossil. Its type locality is USGS 84AKE002, Telsitna Ridge, which is in a Llandeilo carbonate limestone in the Telsitna Formation of Alaska.
It was recombined as Ceratopea medfraensis by Wagner (1999) and Wagner (2023).
It was recombined as Ceratopea medfraensis by Wagner (1999) and Wagner (2023).
Sister species lacking formal opinion data
Synonymy list
Year | Name and author |
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1988 | Helicotoma medfraensis Rohr and Blodgett pp. 304 - 306 figs. f. 2-32.1-2.7; 3 |
1999 | Ceratopea medfraensis Wagner |
2023 | Ceratopea medfraensis Wagner p. 741 |
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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.
†Ceratopea medfraensis Rohr and Blodgett 1988
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Diagnosis
Reference | Diagnosis | |
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D. M. Rohr and R. B. Blodgett 1988 | Low-spired, helicotomid gastropods with impressed suture; upper whorl surface subangular to convex between suture and selenizone-bearing carina at upper-outer edge; growth lines convex forward, strongly prosocline above selenizone, strongly opisthocline below.
Moderately large (specimens range from 6 to 35 mm in diameter), low-spired (apical angle about 140˚), phaneromphalous, twice as wide as high, with short slit and selenizone at upper-outer angulation; width of whorls from suture to suture expands at rate of from 2.6 to 3.3 times per volution; sutures impressed, slightly incised; whorl surface inclined upward to broadly subangular whorl crest which is offset from center toward axis of coiling, then curves with slight concavity downward to a narrow, convex selenizone at upper-outer edge; below selenizone, whorl surface curves convexly downward and around base into umbilicus; umbilical sutures impressed, about two-thirds of previous whorl visible; growth lines prosocyrt, strongly prosocline from suture to selenizone, strongly opisthocline from suture to base, and orthocline from base to umbilicus; aperture with broad V-shaped sinus and narrow, short V-shaped slit. |