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Leptoptygma carrizoensis
Taxonomy
Leptoptygma carrizoensis was named by Kues (2004) [? Leptoptygma carrizoensis]. Its type specimen is UNM 6416, a shell, and it is a 3D body fossil. Its type locality is Locality 2, just west of Carrizo Arroyo section, which is in a Virgilian carbonate shale/limestone in the Madera Limestone Formation of New Mexico.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2004 | Leptoptygma carrizoensis Kues p. 183 figs. 12.10-12.14 |
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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.
†Leptoptygma carrizoensis Kues 2004
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. S. Kues 2004 | Shell small, moderately high spired, with inflated whorls that are slightly flattened on upper face, deeply recessed sutures, a narrow, slightly thickened columellar lip bordering an oval aperture; prominent sharp opisthocyrt growth lines; and obscure spiral lirae.
Shell small (up to about 12 mm high), moderately high spired (shell height about twice shell width), turbiniform, anomphalous, consisting of about nine whorls; whorl expansion rate moderate, decreasing slightly with growth; spiral angle about 45 degrees; body whorl height about one half of total shell height; whorl profile strongly convex; upper whorl face slightly flattened, producing a faintly developed shoulder about one third of distance from upper suture; sutures deeply impressed; aperture oval to subcircular, lacking siphonal canal or notch; columellar lip slightly thickened, rather compressed, nearly straight; inductura thin and inconspicuous, absent from umbilical region; outer lip not preserved but probably with a moderately wide shallow sinus a short distance below suture, as inferred from growth lines; base of body whorl evenly convex, curving broadly into outer whorl surface; ornamentation of teleoconch whorls consisting of fine, sharp, closely-spaced opisthocyrt growth lines, and faint spiral lirae; spiral lirae closely spaced and numbering about four to five on lower half of whorl, becoming widely spaced and stronger on upper half; uppermost spiral lira situated at whorl shoulder, bisecting area of maximum growth line curvature; protoconch orthostrophic, unornamented, consisting of three(?) whorls, with initial whorl slightly flattened. |