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Austrotindaria antiqua
Taxonomy
Austrotindaria antiqua was named by Foster et al. (2017). Its type specimen is NHMUK PI MB 1240 (right valve) and is a 3D body fossil. Its type locality is LD-04, Lusitaniadalen, which is in a Griesbachian marine siltstone in the Vikinghøgda Formation of Svalbard and Jan Mayen.
Sister species lacking formal opinion data
Synonymy list
Year | Name and author |
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2017 | Austrotindaria antiqua Foster et al. p. 858 fig. 5 |
2019 | Austrotindaria antiqua Foster et al. p. 621 fig. 6B |
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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.
†Austrotindaria antiqua Foster et al. 2017
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Diagnosis
Reference | Diagnosis | |
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W. J. Foster et al. 2017 | Shell small, smooth except for concentric growth lines, subtrigonal, inequilateral, prosogyrate; taxodont hinge dentition with more than 50% fewer anterior than posterior ones, obtusely chevron-shaped teeth, hinge plate interrupted below the beak by an edentulous gap, a small rounded triangular pit below the edentulous gap; ligament opisthodetic.
Equivalve, inequilateral shell with a subtrigonal outline and a beak positioned approximately 30% along the length of the dorsal margin from the posterior; H/L ratio 0.6–1. Conspicuously tumid. Umbo prosogyrate, prominent, moderately broad, rounded and projects above the hinge margin. Slightly rounded and gently sloping anterodorsal margin. Posterodorsal margin almost straight to slightly rounded, gently sloping, with a slight angled junction with the posterior margin. Ventral margin deeply rounded. Escutcheon short, relatively broad, elliptical; lunule narrow. Shell smooth with fine concentric growth lines; entire inner margin smooth. Small ligament, external, opisthodetic, with a well-defined margin and wellrounded triangular pit seated beneath the edentulous gap. Hinge plate with taxodont teeth in two series, sometimes separated by a narrow, plain area, without resilifer, that is narrow below the beak, broadening towards the anterior and posterior ends. Robust teeth, moderately long and blunt, with more than 50% fewer anterior than posterior ones. Smooth ventral margin. No pallial line, sinus or muscle scars are present. As the size of the shell increases the edentulous gap becomes proportionally smaller and more central, and moves externally. |