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Technophorus divaricatus
Taxonomy
Technophorus divaricatus was named by Ulrich (1892).
Synonymy list
| Year | Name and author |
|---|---|
| 1892 | Technophorus divaricatus Ulrich |
| 1894 | Technophorus divaricatus Ulrich pp. 616 - 617 figs. pl. 40 f. 37-38 |
| 1914 | Technophorus divaricatus Foerste p. 316 |
| 1924 | Technophorus divaricatus Foerste p. 249 |
| 1976 | Technophorus divaricatus Pojeta and Runnegar pp. 58-59 figs. pl. 14. f. 2-6 |
| 2023 | Technophorus divaricatus Wagner p. 3139 |
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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.
†Technophorus divaricatus Ulrich 1892
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. O. Ulrich 1894 | Shell small, moderately convex, elongate, the length a little more than twice the hight. Beaks small, scarcely projecting above the hinge line, situated about onethird of the entire length from the anterior extremity. Dorsal margin nearly straight, (faintly concave on each side of the beaks) about three-fourths as long as the shell, terminating abruptly where it joins the concave posterior edge, with the upper part of which it forms an angle little short of 90°. Anterior end a little higher than the posterior, strongly rounded in outline, especially above; below rounding neatly into the at first gently convex, then straight and finally concave basal line. Posterior ridge thin but very prominent, curving slightly in its course from the beak to the sharply produced postero-basal angle. Surface uniformly convex and marked with fine, thread-like concentric lines in the antero-basal three-fifths beyond which it first descends into a sulcus and then ascends sharply to the summit of the ridge, dropping on the other side even more abruptly into the wing-like postero-dorsal part of the shell. On each side of the posterior ridge there are distinct divaricating lines, twice as strong as the concentric lines on the anterior part of the shell. They join each other on the ridge, while those on the lower side of the latter meet the concentric lines at angles of about 70°. Finally there is another set of such lines along the dorsal edge, running parallel with the set on the lower side of the ridge. Under a magnifier, with certain lights, these lines appear as though minutely crenulated. Internal characters unknown; shell substance very thin. |