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Helminthozyga undulata
Taxonomy
Helminthozyga undulata was named by Hoare and Sturgeon (1978). Its type specimen is OSU 30412;, a shell, and it is a 3D body fossil. Its type locality is Ty-3. 60 cm shale zone, immediately above limestone at mall abandoned borrow pi, which is in a Desmoinesian shallow subtidal limestone/shale in the Putnam Hill Formation of Ohio.
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Helminthozyga undulata Hoare and Sturgeon pp. 856 - 857 figs. pl. 1 f. 14; pl. 2 f. 4-6; table 2 |
| 2023 | Helminthozyga undulata Wagner p. 5293 |
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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.
†Helminthozyga undulata Hoare and Sturgeon 1978
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare and M. T. Sturgeon 1978 | Protoconch normal for family; sutures deeply impressed; phaneromphalus umbilicus; ornamentation consisting of indistinct transverse undulations.
Very small with deeply impressed sutures and a phaneromphalus umbilicus. Protoconch consisting of about three whorls separated from the teleoconch by a subdued varix or distinct change in shell. Ornamentation of protoconch consists of one smooth whorl and two whorls bearing sharp collabral costellae which are near vertical on upper whorl surface and opisthocline on lower surface, the point of change in orientation marked by a fine, revolving costella. Earlier two to three whorls of the teleoconch smooth or with few slight, indistinct transverse undulations whereas the last whorls bear several broad, indistinct transverse undulations. Growth lines apparently orthocline. |