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Tannudiscus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Weymouthiidae
Formal Genus Name and Reference:
Tannudiscus POKROVSKAYA, 1959, p. 177
Type Species:
T. tannuolaicus, OD, holotype (POKROVSKAYA, 1959, pl. 11, fig. 20), 3536/98, VNIGNI, Moscow
Images
(Click to enlarge in a new window)
Fig. 248,3a. *T. tannuolaicus, Toyonian (Shivelikskaya Suite), Tuva (Shivelik-Khem River, eastern Tannu-Ola Mountains); holotype, × 10 (Pokrovskaya, 1959).——Fig. 248,3b,c. T. balanus RUSHTON, 1966, Lower Cambrian (Purley Shales), England (Warwickshire); holotype, cranidium in dorsal and lateral views, ×12 (Rushton, 1966).
Synonyms
Geographic Distribution
England, Canada (Newfoundland), Russia (Gorno-Altayskaya, Tuva), China (Gansu)
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Toyonian)
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
513.13
Ending Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Toyonian)
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
0
Ending Date:
510.38
Description
Glabella long, wide, bilobed, posterior lobe lacking furrow or spine but may be roundly inflated posteriorly, LO short, low at rear of inflated rear of glabella, border convex, moderately wide, elongate sagittally and extending back to anterior of glabella in some species. Thorax with three segments. Pygidial axis conical, of seven or eight rings, may or may not reach posterior border furrow, ring furrows indistinct or obsolete, border almost flat, similar in width to cephalic border.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Weymouthiidae
Formal Genus Name and Reference:
Tannudiscus POKROVSKAYA, 1959, p. 177
Type Species:
T. tannuolaicus, OD, holotype (POKROVSKAYA, 1959, pl. 11, fig. 20), 3536/98, VNIGNI, Moscow
Images
(Click to enlarge in a new window)
Fig. 248,3a. *T. tannuolaicus, Toyonian (Shivelikskaya Suite), Tuva (Shivelik-Khem River, eastern Tannu-Ola Mountains); holotype, × 10 (Pokrovskaya, 1959).——Fig. 248,3b,c. T. balanus RUSHTON, 1966, Lower Cambrian (Purley Shales), England (Warwickshire); holotype, cranidium in dorsal and lateral views, ×12 (Rushton, 1966).
Synonyms
Geographic Distribution
England, Canada (Newfoundland), Russia (Gorno-Altayskaya, Tuva), China (Gansu)
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Toyonian)
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
513.13
Ending Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Toyonian)
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
0
Ending Date:
510.38
Description
Glabella long, wide, bilobed, posterior lobe lacking furrow or spine but may be roundly inflated posteriorly, LO short, low at rear of inflated rear of glabella, border convex, moderately wide, elongate sagittally and extending back to anterior of glabella in some species. Thorax with three segments. Pygidial axis conical, of seven or eight rings, may or may not reach posterior border furrow, ring furrows indistinct or obsolete, border almost flat, similar in width to cephalic border.