Triangulodus sp. A
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publication ID |
https://doi.org/ 10.3853/j.0067-1975.55.2003.1383 |
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persistent identifier |
https://treatment.plazi.org/id/37439A20-CB04-FF12-FE86-FCF4FEE1F958 |
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treatment provided by |
Felipe |
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scientific name |
Triangulodus sp. A |
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Fig. 29A–P View Fig
Material. 15 specimens (4 Sa, 5 Sb, 5 Sc, 1 Sd) from the Tabita Formation at Mount Arrowsmith , 64 specimens (11 Sa, 30 Sb, 21 Sc, 2 Sd) from unnamed dolomitic limestone unit at Koonenberry Gap .
Description. Only S elements are recognized for this species, characterized by having an open, slightly inflated basal cavity. Sa element symmetrical, tricostate, with a costa along the posterior margin, a broad anterior face, and a costa on each lateral side ( Fig. 29A–E View Fig ); cusp suberect, triangular in cross section. Sb element asymmetrical, bicostate, with an anterolateral costa on the inner lateral side, a posterolateral costa on the outer lateral side, and with broad anterior and posterior surfaces ( Fig. 29F–I View Fig ). Sc element asymmetrical, with a sharp costa along the anterior and posterior margins, and with the most laterally compressed base of all elements recognized; anterior costa inner laterally curved; a broad carina also developed on the inner lateral face ( Fig. 29J–M View Fig ). Sd element nearly symmetrical, with broad anterior and posterior margins, and with a sharp costa on each lateral face ( Fig. 29N–P View Fig ).
Remarks. This species, especially the Sa and Sc elements , somewhat resembles T. larapintinensis , but generally all elements are less laterally compressed with an open, slightly inflated basal cavity.
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