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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Ectogrammysia prolata
Taxonomy
Ectogrammysia prolata was named by Hoare (1993) [= Wilkingia sp. Gordon & Henry 1981, P1.4 , fig. 26.
= Ectogrammysia sp. Busanus & Hoare 1991 p. 474, fig. 5.15. ]. Its type specimen is USNM 459186, a shell, and it is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1993 | Ectogrammysia prolata Hoare pp. 389 – 390 figs. 6.15 – 6.23 |
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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.
†Ectogrammysia prolata Hoare 1993
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare 1993 | Large Ectogrammysia with prominent hinge plate; valve ornamented by more or less regularly developed comarginal ridges, which commonly bifurcate in early growth stages; ridges become irregular to obsolescent in maturity.
Ectogrammysia with elongate shell; beaks prosogyrate, located approximately one-fourth length from anterior margin; umbonal area flattened, no distinct sulcus; anterior and posterior margins nearly evenly convex; ventral margin gently convex, subparallel to dorsal margin; hinge plate well developed, forming a deep groove on internal molds; numerous, closely spaced, bifurcating, comarginal ridges on early growth states, becoming irregular to obsolescent in later growth; fine pustules arranged in radial rows present posteriorly; muscle scars and pallial line not impressed on internal molds. The elongate shape, large size, and change in development of the comarginal wrinkles distinguish Ectogrammysia prolata from other species of the genus. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Hendy 2009, Aberhan et al. 2004 | |||||
Age range: base of the Serpukhovian to the top of the Desmoinesian or 330.90000 to 306.00000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Serpukhovian | USA (West Virginia) | Ectogrammysia prolata (56142 56143 65682) | |
| Morrowan - Desmoinesian | Mexico (Oaxaca) | Ectogrammysia prolata (43452 44290 44297 44305 44332) | |
| Pennsylvanian | Mexico (Oaxaca) | Ectogrammysia prolata (211807 211808 211809 211811 211814) |