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Trigonoconcha acuta
Taxonomy
Trigonoconcha acuta was named by Sanchez (1999). Its type specimen is CEGH-UNC 16158, a shell (One internal mold of 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. It is the type species of Trigonoconcha.
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Trigonoconcha acuta Sanchez figs. 2.9-2.13, 5.1-5.2 |
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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.
†Trigonoconcha acuta Sanchez 1999
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. M. Sanchez 1999 | Orientation follows suggestions by Bradshaw and Bradshaw (1971), who consider the row with the bigger teeth as anterior. Equilateral, dorsoventrally elongated shells with triangular dorsal outline and rounded ventral outline; anteroventral region expanded, posteroventral region reduced; anterior and posterior dorsal margins meeting with angle up to 65 degrees; subcentral umbo, orthogyrate to opisthogyrate; dorsal region opisthocline due to position of anteroposterior axis as suggested by Stanley (1970) (Fig. 5.1); anterior, posterior, and ventral margins forming broad, anteriorly expanded curve; in some small shells (younger growth stages?) anterior and posterior margins curving abruptly, meeting with horizontal ventral margin, resulting in triangular shell outline (Figs. 2.12, 5.2); chevroned, convexodont teeth; up to 15 anterior teeth, up to 10 posterior teeth; anterior teeth larger than posterior teeth, both meeting by three or four small orthomorphic elements (Fig. 5.1); tooth development similar in both smaller and bigger shells; anterior adductor muscle scar well marked, rounded, placed below distal hinge extremity; weak, ovate posterior adductor muscle scar; pallial line entire; ornamentation not preserved. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| valve height | 6 | 4.82 | 2.50 | 7.00 | 5.55 | 1.73 |
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| Source: f = family, c = class | |||||
| References: Meyer et al. 2009, Aberhan et al. 2004 | |||||