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Composita pilula
Taxonomy
Composita pilula was named by Cooper and Grant (1976). Its type specimen is USNM 154539d, a shell (Articulated shell), and it is not a trace fossil. Its type locality is USNM706f, lower Hess Canyon, Glass Mountains, which is in a Roadian slope limestone in the Road Canyon Formation of Texas.
Sister species lacking formal opinion data
Athyris globularis, Athyris globularis, Athyris globularis, Athyris protea, Athyris protea, Athyris protea, Athyris protea, Athyris protea, C. ambigua, C. ambigua, C. argenta, C. athabaskensis, C. bellula, C. caimaensis, C. casteri, C. dawsoni, C. deltoides, C. ficoidea, C. gibbosa, C. globularis, C. hendersoni, C. humilis, C. humulis, C. hunanensis, C. immatura, C. lateralis, C. madisonensis, C. matutina, C. megala, C. mexicana, C. obligata, C. oblonga, C. ozarkana, C. poposiensis, C. prolixa, C. ptygmation, C. salve, C. strigata, C. struniensis, C. subquadtrata, C. subtilata, C. subtilia, C. trilobata, C. trilobata, C. trilobita, C. wasatchensis, C. windsorensis, C. humilis, C. ozarkana
Synonymy list
| Year | Name and author |
|---|---|
| 1976 | Composita pilula Cooper and Grant p. 2159 figs. Pl 657, figs 1-39 |
| 1981 | Composita pilula Hoover p. 95 figs. Pl 8, figs 26-38 |
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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.
†Composita pilula Cooper and Grant 1976
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 57 | 6.86 | 1.90 | 16.1 | 8.00 | 3.25 |
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| Source: subo = suborder, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Collections (15 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Kungurian | Venezuela (Merida) | Composita pilula (41505 41507 41508 41513 41514 41515 41516 41517) | |
| Kungurian | USA (Texas) | Composita pilula (105879) | |
| Roadian | USA (Texas) | Composita pilula (type locality: 43554 102604 102610 102621 105875 106109) |