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Plocezyga percostata

Gastropoda - Pseudozygopleuridae

Taxonomy
Hemizyga (Plocezyga) percostata was named by Knight (1930). Its type specimen is YPM 12998, a shell, and it is not a trace fossil. Its type locality is SL-1. Headwaters of Feefee Creek, north of Olive St. & west of Lindberg Blvd., 1.5 km northwest of Stratmann (Olivette), which is in a Moscovian offshore shale in the Appanoose Formation of Missouri.

It was recombined as Gamizyga (Plocezyga) percostata by Hoare and Sturgeon (1980); it was recombined as Plocezyga percostata by Wagner (2023).

Synonymy list
YearName and author
1930Hemizyga (Plocezyga) percostata Knight
1961Hemizyga (Plocezyga) percostata Hoare pp. 173-174 figs. pl. 21 f. 19-20
1967Hemizyga (Plocezyga) percostata Yochelson and Saunders p. 96
1980Gamizyga (Plocezyga) percostata Hoare and Sturgeon p. 173
2001Hemizyga (Plocezyga) percostata Kues and Batten pp. 77 - 78 figs. f. 15.1-15.3
2023Plocezyga percostata Wagner p. 5377

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

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.

†Plocezyga percostata Knight 1930
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†Gamizyga (Plocezyga) percostata subrotunda Hoare and Sturgeon 1980
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Diagnosis
No diagnoses are available
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: base of the Desmoinesian to the top of the Missourian or 312.80000 to 303.70000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Moscovian315.2 - 307.0USA (Missouri) Hemizyga percostata (type locality: 69773)
Desmoinesian312.8 - 306.0USA (New Mexico) Hemizyga percostata (46536)
Desmoinesian312.8 - 306.0USA (Missouri) Hemizgya percostata (70296 70482)
Missourian306.0 - 303.7USA (Ohio) Gamizyga percostata (79349 183167)