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Mayiella
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Redlichiida
Superfamily:
Redlichioidea
Family:
Mayiellidae
Formal Genus Name and Reference:
Mayiella W. CHANG, 1966, p. 162, 170
Type Species:
M. tuberculata, OD, holotype (W. Chang, 1966, pl. 5, fig. 5), 18182, NIGP, Nanjing
Images
(Click to enlarge in a new window)
Fig. 289,1. *M tuberculata, eastern Yunnan (Malong), holotype, cranidium, thorax, and pygidium, x6 (W. Chang, 1966).
Synonyms
Geographic Distribution
China (eastern Yunnan), Drepanuroides Zone
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (lower Canglangpuan)
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) (lower Canglangpuan)
Ending International Stage:
Cambrian Stage 3
Fraction Up In Ending Stage:
0
Ending Date:
514.5
Description
Cranidium trapezoidal, with rounded front, glabella tapering forward, frontal lobe rounded, glabellar furrows absent, occipital furrow shallow, occipital ring of uniform length (sag. and exs.), anterior border furrow shallow and long (sag. and exs.), within which a row of small tubercles may be present, anterior border gently convex, longer sagittally, eye lobe long and arcuate distally, librigena unknown. Thorax with 10 segments, articulating facets well developed on the anterior 3 or 4 thoracic pleurae, pleural spines short. Pygidium semielliptical, border flat, no border spines.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Redlichiida
Superfamily:
Redlichioidea
Family:
Mayiellidae
Formal Genus Name and Reference:
Mayiella W. CHANG, 1966, p. 162, 170
Type Species:
M. tuberculata, OD, holotype (W. Chang, 1966, pl. 5, fig. 5), 18182, NIGP, Nanjing
Images
(Click to enlarge in a new window)
Fig. 289,1. *M tuberculata, eastern Yunnan (Malong), holotype, cranidium, thorax, and pygidium, x6 (W. Chang, 1966).
Synonyms
Geographic Distribution
China (eastern Yunnan), Drepanuroides Zone
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (lower Canglangpuan)
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) (lower Canglangpuan)
Ending International Stage:
Cambrian Stage 3
Fraction Up In Ending Stage:
0
Ending Date:
514.5
Description
Cranidium trapezoidal, with rounded front, glabella tapering forward, frontal lobe rounded, glabellar furrows absent, occipital furrow shallow, occipital ring of uniform length (sag. and exs.), anterior border furrow shallow and long (sag. and exs.), within which a row of small tubercles may be present, anterior border gently convex, longer sagittally, eye lobe long and arcuate distally, librigena unknown. Thorax with 10 segments, articulating facets well developed on the anterior 3 or 4 thoracic pleurae, pleural spines short. Pygidium semielliptical, border flat, no border spines.