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Yukonides
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Yukoniidae
Formal Genus Name and Reference:
Yukonides FRITZ, 1972, p. 10
Type Species:
Y. lacrinus, OD, holotype (FRITZ, 1972, pl. 8, fig. 1-2), 27278, GSC, Ottawa
Images
(Click to enlarge in a new window).png)
Fig. 250,5a,b. *Y. lacrinus, “Nevadella” Zone, Sekwi Formation, Northwest Territories (Mackenzie Mountains); a, holotype, cranidium, ×8.7; b, pygidium, ×10.8 (Fritz, 1972).
Synonyms
Geographic Distribution
USA (New York), Canada (Northwest Territories), Russia (Siberian Platform)
Age Range
Beginning Stage in Treatise Usage:
middle Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale)
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
514.5
Ending Stage in Treatise Usage:
middle 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
Glabella narrow, with marked preglabellar depression, eye ridge, when elevated, extending to eye tubercles on lateral margin, librigenae absent. Pygidium with axis of five to seven rings, border bearing inconspicuous marginal spines or nodes. middle Lower Cambrian: USA (New York), Canada (Northwest Territories), Russia (Siberian Plat-form).
References
Fritz, W. H. 1972. Lower Cambrian trilobites from the Sekwi Formation type section, Mackenzie Mountains, northwestern Canada. Geological Survey of Canada, Bulletin 212:1-90, pl. 1-20.