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Cydas crossi
Taxonomy
Volutoderma crossi was named by Anderson (1958). Its type specimen is 61934.01 (= CASG 10675) and is a 3D body fossil. It is the type species of Cydas.
It was recombined as Cydas crossi by Saul and Popenoe (1993).
It was recombined as Cydas crossi by Saul and Popenoe (1993).
Synonymy list
| Year | Name and author |
|---|---|
| 1958 | Volutoderma crossi Anderson p. 174 figs. Plate 16, figures 3, 3a |
| 1993 | Cydas crossi Saul and Popenoe p. 360 figs. Figures 38-43 |
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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.
†Cydas crossi Anderson 1958
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. R. Saul and W. P. Popenoe 1993 | As for the genus. [Medium-sized, fusiform perissityids with a sloping shoulder, broadly rounded periphery, and short anterior siphonal neck that has near its anterior end a well-developed siphonal fasciole. Whorls ornamented by rounded axial ribs on posterior half of whorls over-ridden by flat-topped spiral cords. Outer lip expanded to form a rim and having a posterior, four medial, and an anterior denticle within, the central two medial denticles stronger; lip notched posteriorly at the shoulder between posterior and adapical medial denticles. Aperture elongate, narrow, sharply angled and constricted posteriorly. Parietal lip narrow and thin with one or two posterior denticles co- inciding with spiral cords, two pseudofolds on columella just anterior to base of whorl; inner lip broader and thicker on columella, wrapped over to form a pseudoumbilicus anterior to fasciole.] |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: Late/Upper Turonian or 93.50000 to 89.30000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Turonian | USA (California) | Cydas crossi (215288) |