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Bucania stigmosa
Taxonomy
Bucania stigmosa was named by Hall (1852). It is a 3D body fossil.
Synonymy list
Year | Name and author |
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1852 | Bucania stigmosa Hall p. 92 figs. pl. 28 f. 8, 8a-e |
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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.
†Bucania stigmosa Hall 1852
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Diagnosis
Reference | Diagnosis | |
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J. Hall 1852 | Convolute, suborbicular; volutions-?, somewhat rapidly enlarging towards the aperture, which is abruptly expanded with a sinus on the dorsal margin; back of the shell rounded, with a sharp carina along the centre; sides of the volutions somewhat rounded, and abruptly depressed into a deep umbilicus; surface marked transversly by elevated lines, diverging and ascending from the carina, and arching over the side into the umbilicus; longitudinally marked by elevated lines parallel to the carina; intermediate spaces rhomboidal or oval.
The surface of this species is regularly decussated by arching transverse and longitudinal striae, leaving rhomboidal spaces between them. Where these elevated lines are somewhat worn, the spaces appear like oval depressions or scars, with the separating lines not strongly defined. In this condition the surface resembles B. punctifrons; but in all the specimens of that shell examined, there are no direct longitudinal striae visible, and the arching transversa ones are very inconspicuous; the puncta, moreover, are proportionally smaller than in the present species. |