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Retispira espinasa
Discussion
= Retispira n. sp. Otte 1959; = Retispira n. sp. Kues 1991
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Taxonomy
Retispira espinasa was named by Kues (2004). Its type specimen is UNM 13,304, a shell, and it is a 3D body fossil. Its type locality is Locality 11-M-1, La Luz Canyon, which is in a Gzhelian carbonate limestone/limestone in the Laborcita Formation of New Mexico.
Synonymy list
| Year | Name and author |
|---|---|
| 2004 | Retispira espinasa Kues pp. 164 - 166 figs. 7.19-7.28 |
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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.
†Retispira espinasa Kues 2004
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. S. Kues 2004 | Small, highly ornamented, laterally compressed Retispira, having conspicuous transverse folds crossed by numerous fine spiral lirae of at least two ranks, forming nodes at intersection points; possessing a narrow, elevated selenizone adorned with relatively large, nodose lunulae on earliest one half or more of body whorl; pronounced inductural knob present on floor of aperture.
Shell small (up to about 18 mm long), phaneromphalous, compressed laterally so that length exceeds maximum width, expanding moderately anteriorly; height about 0.75 of length; surface relatively sharply rounded to vaguely angular across dorsum, with sides descending steeply and with gentle convexity into umbilical areas; aperture reniform, moderately wide, strongly convex at midline; anterior lips moderately rounded, converging evenly towards narrow, shallow slit; lateral lips prominent, thickened, slightly flexed upward as they approach side of body whorl, then curving abruptly downward just before intersecting it along lower margin of umbilicus; umbilicus deep, round, of small to medium size; inductura smooth, thick, extending from lower surface of lateral lips past plane of aperture and across early body whorl surface, completely and abruptly covering body whorl ornamentation; central part of inductura within aperture forming a longitudinally elongate knob that imparts a definite geniculation to lateral whorl profile; selenizone narrow, elevated as a flat ridge between troughs on either side, with fine, sharp lira along each margin, ornamented by prominent, evenly spaced nodose lunulae along length through first one half to three quarters of body whorl, becoming a welt-like, raised band with closely spaced, narrow lunulae and arcuate growth lines towards aperture; whorl surface covered by spiral lirae of at least two ranks, and by larger, sharp-crested, transverse folds; spiral ornamentation variable but typically including several large, widely spaced, sharply rounded lirae separated by three to five much smaller threads; major lirae thickening to form distinct nodes where crossing transverse folds, but dwindling on lower whorl flanks and into umbilical areas, where ornamentation consists of fine, closely spaced lirae of approximately equal size; transverse folds broad, regularly spaced, typically numbering about 15 to 20 on each side of shell, generally in opposition on each side of selenizone, and separated by interspaces about equal in width; shape of folds gently arcuate but abruptly bent posteriorly near selenizone, becoming smaller and narrower from dorsum to umbilical areas, and fading gradually into irregular clumps of raised growth lines across anterior one quarter to one half of body whorl; growth lines closely spaced, gently sinuous across dorsum and flanks, locally emphasized on some transverse folds as small, regular lira-like structures. Measurements are given in Table 4. |