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Mimospira puhmuense
Taxonomy
Mimospira puhmuense was named by Isakar and Peel (1997). Its type specimen is TUG 669/1, a shell, and it is a 3D body fossil. Its type locality is Puhmu core: 136.55 m, which is in a Caradoc marine limestone in the Ragavere Formation of Estonia.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Mimospira puhmuense Isakar and Peel p. 276 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.
†Mimospira puhmuense Isakar and Peel 1997
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Isakar and J. S. Peel 1997 | The conispiral small shell is coiled sinistrally through about 5 whorls, and increases in diameter such that the apical angle is about 50 degrees. The protoconch is smooth, initially bulbous, and consists of one and a half whorls, approximately 0.4 mm in diameter (Fig. 3D, G, H). The profile of later whorls is convexly rounded, often more convex in the abapical half of the exposed whorl face. Sutures are impressed, a feature sometimes enhanced by slight shouldering of the whorl immediately below the suture (Fig. 3F, I). The heightrwidth ratio of whorls as exposed in the spire is about 0.4; the sutural slope is about 15 degrees. The base is concave without an umbilicus (Fig. 3B). The shape of the aperture is poorly known due to indifferent preservation. The inner lip is thickened and forms a curved arch (Fig. 3B, E) while the outer lip is strongly prosocline.
The external face of the whorls (exclusive of the smooth protoconch) is ornamented by abundant thin, sharp, prosocline ribs which are parallel to the apertural margin and separated by flat interspaces several times wider than the width of the ribs. Variation in the coarseness and spacing of ribs within the population is evident from comparing Figs. 3C and 3F. The ribs slope at an angle of 30-35 degrees to the sutures. The shell is relatively thick and of unknown structure. |
Measurements
No measurements are available
No ecological data are available