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Ammoelphidiella pustulosa
Taxonomy
Ammoelphidiella pustulosa was named by Leckie and Webb (1986) [Original description: Trochoelphidiella pustulosa Leckie & Webb, 1986 (Unaccepted genus)]. It is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Ammoelphidiella pustulosa Leckie and Webb p. 1113 figs. 1-12, 14-15; Pl. 21; Figs. 14-19 |
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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.
†Ammoelphidiella pustulosa Leckie and Webb 1986
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. Leckie and P. N. Webb 1986 | Trochoelphidiella pustulosa n. sp. shares several characteristics with the Pliocene genotype, T. onyxi (Webb, 1974). The attitude of the septal walls, both dor sally and ventrally, is similar in both
species. The presence of a canal system, though crudely developed in T. pustulosa, establishes an affinity with T. onyxi. Both possess interiomarginal multiple apertures and exhibit a prominent pustulation on the umbilical side. Dimorphism, with a dominance of the megalospheric generation, is another shared feature. Trochoelphidiella pustulosa differs from Pliocene T. onyxi in several respects. The chambers of T. onyxi increase gradually as added, producing a test that is circular in outline in contrast to the more oblong shape of T. pustulosa, which is produced by chambers that increase rapidly in size. T. pustulosa lacks the distinctive, paired, septal canal foramina of T. onyxi. The canal system of T. pustulosa is rather simple and is developed primarily in the umbilical area. The pustulation of T. pustulosa is coarser than that of the Pliocene T. onyxi. The spiral side of T. onyxi is convex, and low to highly elevated, whereas the spiral side of T. pustulosa is nearly flat. The apertures of T. pustulosa also differ somewhat from T. onyxi in that they are confined to a single row of small foramina at the base of the final chamber and extend only from the periphery to the umbilicus. Those of T. onyxi consist to one to two rows of small foramina that may extend across the entire base of the apertural lumen (interiomarginal). A further distinction between the two species is in the size of their two generations; the megalospheric and microspheric forms of T. pustulosa are similar in size, whereas the two generations of T. onyxi demonstrate a marked difference in size, the microspheric form being the larger. Trochoelphidella pustulosa is biostratigraphically significant at Site 270. It first appears in 270-38-3, 87-96 cm (Subunit 21) and ranges up through Subunits 2H, 2G, 2F, with a single occurrence in Subunit 2B. It is probably ancestral to T. uniforamina D'Agostino (early to middle and ?late Miocene) and T. onyxi Webb (Pliocene). Type specimens to be placed in the U.S. National Museum, Washington, D.C. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Collections
No collection or age range data are available