Promicroceras

Promicroceras is an extinct ammonite genus from the upper Sinemurian (Lower Jurassic)[1] of Europe, named by Leonard Spath in 1925. Promicroceras is included in the family Eoderoceratidae, which is part of the ammonitid superfamily Eoderoceratoidea.

Promicroceras
Temporal range: Sinemurian[1]
Promicroceras pyritosum
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Superfamily:
Eoderoceratoidea
Family:
Eoderoceratidae
Genus:
Promicroceras

Spath, 1925
Species[2]
  • P. capricornoides
  • P. cowapi
  • P. marstonense
  • P. planicosta
  • P. precompressum
  • P. pyritosum

Shells are evolute with an open umbilicus; strongly ribbed, ribs flattened on the venter, and with small spines without distinct tubercles.

Distribution

Promicroceras species are commonly found in South West England, particularly along the Dorset coast.[2]

Pyritic Promicroceras fossils are commonly found along the coast of Lyme Regis where they are well preserved in the Lower Jurassic (Sinemurian) Black Ven Marl. Fossil shops in the area commonly sell cleaned and polished Promicroceras.

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References
Notes
  1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. Cite journal requires |journal= (help)
  2. Paleobiology Database - Promicroceras. 2014-05-29.
Bibliography
  • Treatise on Invertebrate Paleontology, Part L Ammonoidea ; Geological Society of America and Univ of Kansas press, 5th printing,1990. (L345-347)
  • Die Ammoniten des süddeutschen Lias. Ein Bestimmungsbuch für Fossiliensammler und Geologe.


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