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Clavagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Clavagnostidae
Formal Genus Name and Reference:
Clavagnostus Howell, 1937, p. 1164, Acanthagnostus Qian, 1982, p. 640, Clavagnostus (Leptagnostus) Lu & LIN, 1989, p. 199
Type Species:
Agnostus repandus Westergård in Holm & WESTERGÅRD, 1930, p. 13, OD
Images
(Click to enlarge in a new window)
Fig. 235,2a,b. *C. repandus (WESTERGÅRD), Middle Cambrian (Paradoxides forchhammeri Stage), Sweden (Andrarum, Skåne); a, holotype, cephalon, LO 3131T, × 6; b, paratype, pygidium, SGU 5461, ×6; (Westergård, 1946, pl. 4, fig. 19–20).
Synonyms
Tomorhachis, Culipagnostus, Stigmagnostus, Tomagnostus, Acanthagnostus, Clavagnostus (Leptagnostus)
Geographic Distribution
USA (Vermont, Alabama); Argentina; Germany; Sweden, L. laevigata Zone; Russia (Bennett Island), P. forchhammeri Zone, (southwestern Siberia, Altay Mountains, Salair), L. laevigata Zone, (northwestern Siberia), L. armata to M. mirabilis Zones, (southeastern Siberia), Solenoparia Zone; Turkestan Mountain Range, L. laevigata Zone; Kazakhstan, L. armata to K. simplex Zone; Canada (Northwest Territories), Cedaria minor Zone; Australia (Tasmania), L. laevigata Zone, (Queensland), E. eretes to G. stolidotus Zones; China (Zhejiang), L. armata to G. stolidotus Zones, (Shandong), Drepanura Zone, (Anhui, Hunan, Qinghai), zone uncertain.
Age Range
Beginning Stage in Treatise Usage:
upper Middle Cambrian
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Nonscrobiculate, median preglabellar furrow variably developed. Glabellar node elongate, located in anterior half of glabella. Pygidium bispinose or trispinose, posterior lobe commonly reaching border furrow or connected to it by median postaxial furrow, with a broad transverse depression and a pair of longitudinal (exsag.) pits at about lobe midlength.
References
Hayes, A. O., \& B. J. Howell. 1937. Geology of the Saint John, New Brunswick. Geological Society of America, Special Paper 5:1-146.
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Clavagnostidae
Formal Genus Name and Reference:
Clavagnostus Howell, 1937, p. 1164, Acanthagnostus Qian, 1982, p. 640, Clavagnostus (Leptagnostus) Lu & LIN, 1989, p. 199
Type Species:
Agnostus repandus Westergård in Holm & WESTERGÅRD, 1930, p. 13, OD
Images
(Click to enlarge in a new window)
Fig. 235,2a,b. *C. repandus (WESTERGÅRD), Middle Cambrian (Paradoxides forchhammeri Stage), Sweden (Andrarum, Skåne); a, holotype, cephalon, LO 3131T, × 6; b, paratype, pygidium, SGU 5461, ×6; (Westergård, 1946, pl. 4, fig. 19–20).
Synonyms
Tomorhachis, Culipagnostus, Stigmagnostus, Tomagnostus, Acanthagnostus, Clavagnostus (Leptagnostus)
Geographic Distribution
USA (Vermont, Alabama); Argentina; Germany; Sweden, L. laevigata Zone; Russia (Bennett Island), P. forchhammeri Zone, (southwestern Siberia, Altay Mountains, Salair), L. laevigata Zone, (northwestern Siberia), L. armata to M. mirabilis Zones, (southeastern Siberia), Solenoparia Zone; Turkestan Mountain Range, L. laevigata Zone; Kazakhstan, L. armata to K. simplex Zone; Canada (Northwest Territories), Cedaria minor Zone; Australia (Tasmania), L. laevigata Zone, (Queensland), E. eretes to G. stolidotus Zones; China (Zhejiang), L. armata to G. stolidotus Zones, (Shandong), Drepanura Zone, (Anhui, Hunan, Qinghai), zone uncertain.
Age Range
Beginning Stage in Treatise Usage:
upper Middle Cambrian
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Nonscrobiculate, median preglabellar furrow variably developed. Glabellar node elongate, located in anterior half of glabella. Pygidium bispinose or trispinose, posterior lobe commonly reaching border furrow or connected to it by median postaxial furrow, with a broad transverse depression and a pair of longitudinal (exsag.) pits at about lobe midlength.
References
Hayes, A. O., \& B. J. Howell. 1937. Geology of the Saint John, New Brunswick. Geological Society of America, Special Paper 5:1-146.