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Orthonema inornatum
Taxonomy
Orthonema inornatum was named by Knight (1934). Its type specimen is YPM 13946, a shell, and it is not a trace fossil.
Synonymy list
Year | Name and author |
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1934 | Orthonema inornatum Knight p. 446 figs. pl. 57 f. 1a-d |
1961 | Orthonema inornatum Hoare pp. 186 - 187 figs. pl. 22 f. 18 |
2001 | Orthonema inornatum Kues and Batten p. 55 figs. f. 10.16-10.18 |
2023 | Orthonema inornatum Wagner p. 5827 |
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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.
†Orthonema inornatum Knight 1934
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Diagnosis
Reference | Diagnosis | |
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J. B. Knight 1934 | Moderately small, very high-spired, slender, nonturreted gastropods with sides straight a t ephebic and very slightly convex a t neanic stages; whorl profile nearly flat, very gently concave above and convex below, adpressed above, evenly rounded on the base, sutures shallow, almost linear; columella slightly arcuate; inner lip slightly reflexed; parietal inductura thin, inconspicuous; outer lip with a characteristic sinuosity, the lines of growth passing sharply and obliquely backward from the upper suture with a marked convexity toward the aperture until just before crossing the faint revolving thread on the upper whorl-face where they curve rather sharply downward and a very little forward to pass down across the lower whorl-face almost without concavity toward the aperture, on the base slightly convex toward the aperture; ornamentation other than obscure lines of growth almost lacking, but an obscure revolving carina or thread on the upper whorl-face about one quarter of the suture-to-suture distance below the upper suture, and two very much falnter ones just above and below the lower line of suture; color pattern, a dark revolving band between the upper suture and the revolving thread and another dark, revolving band along the lower line of suture. |