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Trochonemopsis meekanum

Gastropoda - Euomphalina - Omphalotrochidae

Taxonomy
Trochonema meekanum was named by Miller (1889). It is not a trace fossil.

It was recombined as Trochonemopsis meekanum by Wagner (2023).

Synonyms
Synonymy list
YearName and author
1871Trochonema tricarinata Meek pp. 82 - 83
1873Trochonemopsis tricarinata Meek pp. 218 - 219 figs. pl. 19 f. 5a-b
1889Trochonema meekanum Miller
1910Trochonema ovoides Grabau and Sherzer
1936Trochonema ovoides Carman
2023Trochonemopsis meekanum Wagner p. 2518

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassEogastropoda
orderEuomphalina
superfamilyEuomphaloidea()
familyOmphalotrochidae
genusTrochonemopsis
speciesmeekanum()

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.

Trochonemopsis meekanum Miller 1889
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Invalid names: Trochonemopsis ovoides Grabau and Sherzer 1910 [synonym], Trochonemopsis tricarinata Meek 1871 [replaced]
Diagnosis
ReferenceDiagnosis
F. B. Meek 1871 (Trochonema tricarinata)Shell turbinate, thin, a little wider than high; spire depressed.
Volutions about five, strongly shouldered, or nearly rectangular above; the upper surface being flat, or a little concave, and extended out almost horizontally to the rectangular and carinate shoulder; below this the outer side is nearly vertically flattened to a second carina passing around near the middle of the body whorl, exactly coincident with the suture between that and the succeeding turn, so as not to be exposed on the spire; below this second carina the under side of the body volution is flattened, with a strong inward slope, to a third well-defined carina, passing around the middle of the under side, and forming the margin of the umbilicus. Aperture oval-subpentagonal, being a little higher than wide, and somewhat angular- above, at the connection of its outer lip with the return of the spire, and at the termination of each of the three revolving carinee, as well as very obscurely so a little below the middle of the inner side; inner lip thin below its connection with the carina passing around the umbilicus, at which point it is very slightly thickened, while above this it seems to be nearly or quite obsolete. Umbilicus rather wide, but shallow, or very rapidly contracting within. Suture well defined, without being in the slightest degree furrowed. Surface only showing very fine lines of growth, which, on the upper flattened space of the volutions, pass obliquely outward and backward, with a very slight curve from the suture to the upper angle or shoulder, below which they pass nearly straight down the outer flattened area to the second carina, which is as far as they can be traced in the specimen studied.