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Pterotheca hispanica
Taxonomy
Pterotheca hispanica was named by Ebbestad and Gutiérrez-Marco (2017). Its type specimen is MGM 900S, a shell, and it is a 3D body fossil. Its type locality is 800 m east-southeast from the San Pelayo Chapel, Pontedo, which is in an Aeronian carbonate shale in the Formigoso Formation of Spain.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Pterotheca hispanica Ebbestad and Gutiérrez-Marco fig. 3 |
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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.
†Pterotheca hispanica Ebbestad and Gutiérrez-Marco 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. O. R. Ebbestad and J. C. Gutiérrez-Marco 2017 | A small species of Pterotheca with an ovate shell, a narrow and deep V-shaped sinus leading into a narrow slit. Median carina narrow at base. Distinct trilobation of the median dorsum is missing. Septum is 40% of shell length and 49% of maximum width, being slightly longer than wide and with a septal angle of 69˚. Ornamentation of fine co-marginal growth lines bundle into periodic co-marginal bands.
The shell is very low, semi-circular, 16 mm wide and 15 mm long, length thus being 90% of the width. Maximum width is at mid-length. Some dorsoventral compaction is evident, contributing to the very low shell form. The median dorsal carina is broken except for a small part at the anterior apertural sinus where it turns upwards. Its height is unknown but the scar of the broken carina further back shows that it was narrow at the base, and a marked trilobation of the shell is therefore not expressed. Instead, the shell is slightly concave adaperturally along the carina. The apertural margin swings sharply backwards medially to form a narrow V-shaped sinus with an angle of 24 deg and reaching back about 24% of shell length where it turns into a narrow slit of unknown length. Formation of a selenizone is not evident because of preservation. The septum is 40% of shell length (based on the LS measure) and 49% of maximum width. The width is 88% of the length, with the septal angle at the posterior being 698. The growth lines seen at the anterior part of the septum are superimposed from the outer shell. Surface ornamentation consists of fine comarginal growth lines that form regularly spaced growth increments visible as co-marginal bands; altogether seven bands are discernible, but the posterior part is obscured. |