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Eodiscus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Eodiscidae
Formal Genus Name and Reference:
Eodiscus Hartt in WALCOTT, 1884b, p. 24
Type Species:
E. pulchellus, OD, syntypes (Rasetti, 1952a, pl. 54, fig. 10-11), 3794, CU, Ithaca, =Microdiscus scanicus Linnarsson, 1883, p. 29, lectotype (LINNARSSON, 1883, pl. 4, fig. 17), 5602, SGU, Uppsala
Images
(Click to enlarge in a new window)
.png)
Fig. 252,1a–c. *E. scanicus (L INNARSSON ), Middle Cambrian (Ptychagnostus atavus Zone), Sweden; a, whole specimen, ×6; b, lectotype, cranidium, SGU 5602, ×6; c, cranidium, ×6 (Westergård, 1946).
Synonyms
Spinodiscus, Deltadiscus
Geographic Distribution
Canada (Newfoundland, New Brunswick), Sweden, Spain, Wales, England, Norway, Russia (Siberian Platform)
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Glabella may be anteriorly acuminate, S1 and S2 discontinuous lateral indentations only, frontal area relatively long, with median preglabellar furrow, border short, uniform, scrobicules may be effaced, eyes and facial sutures absent. Thorax with three segments. Pygidium with long, narrow axis of 10 or more rings, border narrow. Surface ornament variable between species.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Eodiscidae
Formal Genus Name and Reference:
Eodiscus Hartt in WALCOTT, 1884b, p. 24
Type Species:
E. pulchellus, OD, syntypes (Rasetti, 1952a, pl. 54, fig. 10-11), 3794, CU, Ithaca, =Microdiscus scanicus Linnarsson, 1883, p. 29, lectotype (LINNARSSON, 1883, pl. 4, fig. 17), 5602, SGU, Uppsala
Images
(Click to enlarge in a new window)
Fig. 252,1a–c. *E. scanicus (L INNARSSON ), Middle Cambrian (Ptychagnostus atavus Zone), Sweden; a, whole specimen, ×6; b, lectotype, cranidium, SGU 5602, ×6; c, cranidium, ×6 (Westergård, 1946).
Synonyms
Spinodiscus, Deltadiscus
Geographic Distribution
Canada (Newfoundland, New Brunswick), Sweden, Spain, Wales, England, Norway, Russia (Siberian Platform)
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Glabella may be anteriorly acuminate, S1 and S2 discontinuous lateral indentations only, frontal area relatively long, with median preglabellar furrow, border short, uniform, scrobicules may be effaced, eyes and facial sutures absent. Thorax with three segments. Pygidium with long, narrow axis of 10 or more rings, border narrow. Surface ornament variable between species.