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Cyclozyga attenuata
Taxonomy
Cyclozyga attenuata was named by Hoare and Sturgeon (1978). Its type specimen is OSU 30415, a shell, and it is a 3D body fossil. Its type locality is Ss-4. Abandoned D&M Coal Co. strip mine. 4.8 kilometers west of Malvern, which is in a Desmoinesian marine shale/limestone in the Allegheny Formation of Ohio.
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Cyclozyga attenuata Hoare and Sturgeon p. 856 figs. pl. 2 f. 8-9; table 1 |
| 2023 | Cyclozyga attenuata Wagner p. 5292 |
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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.
†Cyclozyga attenuata Hoare and Sturgeon 1978
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare and M. T. Sturgeon 1978 | Protoconch normal for family; sutures impressed; ornamentation of four revolving costellae; shape narrowly attenuate.
Very small, narrowly attenuate, with impressed sutures, whorl profile rounded, aperture subquadrate, base somewhat flattened and an anomphalus umbilicus. Protoconch with one smooth whorl followed by two whorls with collabral costellae. Teleoconch separated from protoconch by a distinct growth line. Teleoconch marked by four revolving, equally spaced, narrow, low costellae with wider interspaces. Revolving costellae may become indistinct or obsolete on later whorls. Growth lines are smoothly prosocline. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| height | 4 | 1.86 | 1.50 | 2.10 | 1.95 | 0.263 |
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| Source: f = family | |||||
| References: Kiessling 2004, Wagner 2023 | |||||
Age range: base of the Atokan to the top of the Missourian or 318.60000 to 303.70000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Atokan | USA (Ohio) | Cyclozyga attenuata (79351) | |
| Desmoinesian | USA (Ohio) | Cyclozyga attenuata (72004 type locality: 93081) | |
| Missourian | USA (Ohio) | Cyclozyga attenuata (79350 93082) |