Basic info Taxonomic history Classification Included Taxa
Morphology Ecology and taphonomy External Literature Search Age range and collections

Ceratopea medfraensis

Gastropoda - Euomphalina - Raphistomatidae

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).

Sister species lacking formal opinion data

Synonymy list
YearName and author
1988Helicotoma medfraensis Rohr and Blodgett pp. 304 - 306 figs. f. 2-32.1-2.7; 3
1999Ceratopea medfraensis Wagner
2023Ceratopea medfraensis Wagner p. 741

Is something missing? Join the Paleobiology Database and enter the data

RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassEogastropoda
orderEuomphalina
superfamilyRaphistomatoidea
familyRaphistomatidae()
genusCeratopea
speciesmedfraensis()

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
show all | hide all
Diagnosis
ReferenceDiagnosis
D. M. Rohr and R. B. Blodgett 1988Low-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.