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Morphology Ecology and taphonomy   Age range and collections

Gamizyga

Gastropoda - Pseudozygopleuridae

Taxonomy
Gamizyga was named by Hoare and Sturgeon (1980) [Sepkoski's age data: C Mosc-u P Leon Sepkoski's reference number: 797].

It was reranked as Plocezyga (Gamizyga) by Hoare and Sturgeon (1980).

It was assigned to Plocezyga by Hoare and Sturgeon (1980); to Neotaenioglossa by Sepkoski (2002); and to Pseudozygopleuridae by Hoare and Sturgeon (1980) and Wagner (2017).

Synonymy list
YearName and author
1980Gamizyga Hoare and Sturgeon pp. 160 – 161
1980Plocezyga (Gamizyga) Hoare and Sturgeon p. 1101
2002Gamizyga Sepkoski, Jr.
2017Gamizyga Wagner p. G327

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
RankNameAuthor
classGastropodaCuvier 1797
subclassProsobranchiaMilne-Edwards 1848
superorderCaenogastropodaCox 1959
superfamilyZygopleuroidea
familyPseudozygopleuridae()
genusGamizyga

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.

Diagnosis
ReferenceDiagnosis
R. D. Hoare and M. T. Sturgeon 1980In part as defined by Knight (1930, p. 18) for the subgenus Hemizyga as having collabral threads which are more prominent than the finer revolving threads, the former passing across the base of the whorl to the columellar lip. Protoconch typically pseudozygopleurid as described herein.

Small to medium sized pseudozygopleurids with transverse threads extending onto the whorl base to the columellar lip and more strongly developed than the revolving threads. Mean spiral angle variable, correlating with a wide range of shell form as illustrated by Batten (1966), herein, and possibly by Knight (1930). Whorls normally tightly coiled but may be loosely coiled as illustrated by Batten (1966). Sutures deeply to shallowly impressed and whorl profile strongly to gently rounded, becoming pendant in some instances.