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Parkula esmeraldina
Taxonomy
Parkula esmeraldina was named by Skovsted (2006). Its type specimen is USNM 530272, a shell, and it is not a trace fossil. Its type locality is CS990917-03, which is in a Dyeran offshore shelf limestone in the Emigrant Formation of Nevada.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Parkula esmeraldina Skovsted p. 492 fig. 3A–3I |
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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.
†Parkula esmeraldina Skovsted 2006
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. B. Skovsted 2006 | Species of Parkula with well-developed ornamentation of transverse striations on conch and operculum. Aperture of conch has a shallow median dorsal sinus. Operculum with short but well-developed cardinal processes projecting well beyond the cardinal shield.
Straight and slender conchs (angle of divergence 20°) up to approximately 1 mm long, but some specimens lack the apical portion. The transverse cross section is lenticular, with the dorsal side more strongly convex than the ventral side. The dorsal and ventral surfaces meet along the smoothly rounded lateral edges. The dorsal side has a very weak median ridge. The ligula is semielliptical and approximately two times wider than long. The aperture has a well-defined dorsal median sinus, and the conch is ornamented by well-developed rounded comarginal ribs. Co-ocurring opercula (Figs. 3D–3I) have a narrow sigmoidal cardinal shield that reflects the dorsal median sinus of the conch and poorly defined tectula. The conical shield is strongly convex with well-defined comarginal ribs. The cardinal pro- cesses are short, but in lateral view project beyond the cardinal shield. In effect they are situated in front of the cardinal shield rather than under it. One pair of clavicles that ends in blade-like projections is situated at the junction of the cardinal and conical shields. |
Measurements
No measurements are available
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| Source: o = order, p = phylum | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||