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Helminthozyga costellata

Gastropoda - Pseudozygopleuridae

Taxonomy
Helminthozyga costellata was named by Hoare and Sturgeon (1978). Its type specimen is OSU 30409, a shell, and it is a 3D body fossil. Its type locality is CAr-2. Spoils bank at James Brothers strip mine on the south side of Huff Run, a, which is in a Missourian coastal shale/limestone in the Washingtonville Formation of Ohio.

Synonymy list
YearName and author
1978Helminthozyga costellata Hoare and Sturgeon p. 857 figs. pl. 2 f. 1; table 2
2023Helminthozyga costellata Wagner p. 5294

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassCaenogastropoda(Cox 1959)
superfamilyZygopleuroidea
familyPseudozygopleuridae()
genusHelminthozyga
speciescostellata

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 costellata Hoare and Sturgeon 1978
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Diagnosis
ReferenceDiagnosis
R. D. Hoare and M. T. Sturgeon 1978Protoconch normal for family; sutures deeply impressed; phaneromphalus umbilicus; ornamentation of numerous, closely spaced, transverse costellae.

Very small with deeply impressed sutures and a phaneromphalus umbilicus. Protoconch consisting of two to three whorls separated from the teleoconch by a distinct change in the shell. First whorl of protoconch smooth and latter one and one-half whorls marked by sharp opisthocyrt collabral costellae and a fine revolving costella near midwhorl. Teleoconch ornamented with closely spaced, narrow, sigmoidal costellae extending from upper suture to below lower suture. Growth lines parallel costellae.
Measurements
No measurements are available
Composition: aragonitef
Environment: marinef
Locomotion: actively mobilef
Life habit: epifaunalf
Diet: detritivoref
Vision: limitedf
Created: 2025-08-07 22:21:22
Modified: 2025-08-07 22:21:22
Source: f = family
References: Wagner 2023, Kiessling 2004

Age range: Missourian or 306.00000 to 303.70000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Missourian306.0 - 303.7USA (Ohio) Helminthozyga costellata (type locality: 79350)