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Villicumia canteraensis
Taxonomy
Villicumia canteraensis was named by Sanchez (1999). Its type specimen is CEGH-UNC 16152a, a shell (left valve), and it is a 3D body fossil. Its type locality is south side of the Quebrada La Pola, Eastern flank of Sierra de Villicum, which is in a Caradoc marine conglomerate in the La Cantera Formation of Argentina.
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Villicumia canteraensis Sanchez |
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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.
†Villicumia canteraensis Sanchez 1999
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. M. Sanchez 1999 | Rounded shell with anterior extremity slightly projected and posterior margin rounded; anterodorsal margin arched towards shell body, posterodorsal margin arched outward of shell body; anterodorsal and posterodorsal margins meeting with angle of about 115 degrees; umbo placed at anterior half of valve, prosogyrate; chevroned teeth, small in subumbonal region, enlarging towards hinge extremities; few small posterior teeth overlap first anterior teeth in the subumbonal region (Figs. 2.6, 2.7, 4.1); from umbo towards hinge extremities, chevrons modify by progressive enlargement and inclination of dorsal branch; distally, teeth become pendent, near vertical; successive changes and increasing size of anterior and posterior teeth are similar, but tooth number differs: 11 anterior and 17 posterior; anterior adductor scar rounded, greater, and stronger than posterior adductor scar; pallial line not preserved. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| valve height | 5 | 3.23 | 1.80 | 7.00 | 3.12 | 2.14 | |
| valve diagonal | 5 | 3.12 | - | - | 3.12 | - |
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| Source: f = family, c = class | |||||
| References: Meyer et al. 2009, Aberhan et al. 2004 | |||||