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Gamizyga
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 (2023).
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 (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1980 | Gamizyga Hoare and Sturgeon pp. 160 – 161 |
| 1980 | Plocezyga (Gamizyga) Hoare and Sturgeon p. 1101 |
| 2002 | Gamizyga Sepkoski |
| 2023 | Gamizyga Wagner p. G327 |
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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.
G. †Gamizyga Hoare and Sturgeon 1980
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Subg. †Gamizyga (Gamizyga) Hoare and Sturgeon 1980
†Gamizyga corpulentissima Knight 1930
†Gamizyga expansa Hoare and Sturgeon 1980
†Gamizyga girtyi Hoare and Sturgeon 1980
†Gamizyga morningstarae Hoare and Sturgeon 1980
†Gamizyga nitida Hoare and Sturgeon 1980
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare and M. T. Sturgeon 1980 | In 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. |