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Taxonomy
Venus (Mercenaria) varians was named by Gabb (1864). Its type specimen is ANSP 4383 (lectotype) and is a 3D body fossil.
It was recombined as Chione varians by Waring (1917); it was recombined as Aphrodina varians by Stewart (1930), Hoots (1931); it was recombined as Calva varians by Popenoe (1937); it was recombined as Trigonocallista varians by Taff et al. (1940); it was recombined as Calva (Calva) varians by Saul and Popenoe (1992).
It was recombined as Chione varians by Waring (1917); it was recombined as Aphrodina varians by Stewart (1930), Hoots (1931); it was recombined as Calva varians by Popenoe (1937); it was recombined as Trigonocallista varians by Taff et al. (1940); it was recombined as Calva (Calva) varians by Saul and Popenoe (1992).
Sister species lacking formal opinion data
Synonymy list
Year | Name and author |
---|---|
1864 | Venus (Mercenaria) varians Gabb p. 161 figs. PL 23, Fig. 140, 140 a, and 141 |
1917 | Chione varians Waring p. 56 |
1930 | Aphrodina varians Stewart pp. 249 - 250 figs. Plate 6, fig. 6 |
1931 | Aphrodina varians Hoots p. 91 |
1937 | Calva varians Popenoe p. 395 |
1940 | Trigonocallista varians Taff et al. p. 1321 figs. Plate 2, figures 10, 11 |
1992 | Calva (Calva) varians Saul and Popenoe pp. 19 - 24 figs. Figures 67-89 |
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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.
†Calva (Calva) varians Gabb 1864
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Diagnosis
Reference | Diagnosis | |
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L. R. Saul and W. P. Popenoe 1992 | A Calva with nearly straight lunular margin, smooth lateral teeth, and cardinal tooth 1 longer than and approaching closer to the
beak than 3a. |
Measurements
No measurements are available
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Source: f = family, c = class | |||||
References: Kiessling 2004, Aberhan et al. 2004 |
Age range: base of the Cenomanian to the top of the Early/Lower Maastrichtian or 100.50000 to 66.00000 Ma
Collections (51 total)
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Cenomanian | USA (California) | Trigonocallista varians (167603) | |
Late/Upper Cretaceous | USA (California) | Aphrodina varians (206278 237459 237460) | |
Turonian | USA (California) | Aphrodina varians (44217) | |
Coniacian | USA (California) | Aphrodina varians (44232) | |
Santonian | USA (California) | Aphrodina varians (44279) | |
Campanian | USA (California) | Chione varians (158389) | |
Late/Upper Campanian | USA (California) | Calva varians (1516 1519 1522 1524 1526 1527 1528 1530 1531 1532 1534 1535 1537 1538 1539 1540 1541 1543 1546 1549 1551 1552) | |
Middle Campanian | USA (California) | Venus varians (72056) | |
Late/Upper Campanian - Early/Lower Maastrichtian | USA (California) | Calva varians (1529 1533) | |
Early/Lower Maastrichtian | USA (California) | Calva varians (219070) | |
Late/Upper Maastrichtian | USA (California) | Calva varians (214073 219052 219054 219087) | |
Maastrichtian | USA (California) | Calva varians (176930 185457 185491 185495 185622 185623 185625 185635 185701 185703 185705 185706) Corbis peninsularis (83793) |