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Serrodiscus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Weymouthiidae
Formal Genus Name and Reference:
Serrodiscus Richter & RICHTER, 1941a, p. 23
Type Species:
Eodiscus (Serrodiscus) serratus, OD, holotype (Richter & RICHTER, 1941a, pl. 1, fig. 1), 1234, SMF, Frankfurt am Main
Images
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Fig. 249,2a,b. *S. serratus, Herrerias-Mergel Formation (serratusBand), Spain (Cala); a, cephalon, × 2; b, holotype, pygidium, ×2.5 (Richter & Richter, 1941a).
Synonyms
Paradiscus
Geographic Distribution
USA (New York, Massachusetts, Alaska), Canada (Newfoundland, New Brunswick, Northwest Territories), Greenland, Spitsbergen, England, Wales, Spain, Germany, Poland, Morocco, Russia (Mt. Altay), China (Gansu), Australia (South Australia, New South Wales).
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale)
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
0
Ending Date:
509
Description
Cephalon semielliptical, glabella long, conical or parallel sided, usually weakly furrowed or unfurrowed (but S2 and S3 may be better impressed), LO generally short, with or without a spine, cheeks joined anteriorly in short preglabellar field or separated by a depression, border convex, with up to eight pairs of tubercles laterally. Thorax with three segments. Pygidium with wide, subconical axis of more than eight rings, pleural area unfurrowed or extremely weakly furrowed on internal mold, border narrowing posteriorly, usually with ventral spines.