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Ptychomphalina angulata
Taxonomy
Mourlonia angulata was named by Easton (1943). Its type specimen is USGS 5203, a skeleton, and it is not a trace fossil.
It was recombined as Ptychomphalina angulata by Gordon and Yochelson (1987) and Wagner (2023).
It was recombined as Ptychomphalina angulata by Gordon and Yochelson (1987) and Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1943 | Mourlonia angulata Easton pp. 150 - 151 figs. pl. 24 f. 17-19 |
| 1974 | Mourlonia angulata Thein and Nitecki pp. 83 - 84 figs. f. 28 |
| 1987 | Ptychomphalina angulata Gordon and Yochelson p. 54 |
| 2023 | Ptychomphalina angulata Wagner p. S6110 |
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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.
†Ptychomphalina angulata Easton 1943
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. H. Easton 1943 | Shell small, turbiniform; spire straightsided. Whorl profile above selenizone broadly convex. Selenizone slightly concave bounded by costae. Whorl profile below selenizone very sharply rounded above, broadly convex below, rather sharply rounded at umbilical shoulders. Nucleus apparently unornameuted. Surface covered with well-defined oblique costae, about 8 in 1.0 mm., above selenizone slightly convex forward, below selenizone passing backward less obliquely, swinging forward slightly to umbilical shoulders where reversal begins; thus, costae external to umbilical shoulder and below selenizone are convex backward but at smaller angle than above. Lunulae not clearly observed. Very fine revolving lirae'present between selenizone and umbilical shoulders. Exceptionally, even finer lirae are preserved between selenizone and suture. Dark zig-zag color markings between suture and selenizone, directed backward more obliquely than costae, possess 2 sharply V-shaped backward angles in middle; repeated about every third or fourth costa; at periphery of whorl pass into irregular splotches. |