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Triplagnostus
Classification
Phylum:
Arthropoda
Class:
Trilobita
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Ptychagnostidae
Formal Genus Name and Reference:
Triplagnostus HOWELL, 1935c, p. 14
Type Species:
Agnostus gibbus LINNARSSON, 1869, p. 81, OD, types not identified
Images
(Click to enlarge in a new window)
Fig. 225,1a,b. *T. (T.) gibbus (LINNARSSON), Middle Cambrian (Triplagnostus gibbus Zone), Exsulans Limestone; a, cephalon, SGU 4891, Sweden (Brantevik, Skåne), × 8; b, pygidium, SGU 4890, Sweden (Andrarum, Skåne), × 8 (new).
Synonyms
Geographic Distribution
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
40
Beginning Date:
512.3
Ending Stage in Treatise Usage:
Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
50
Ending Date:
498.75
Description
Rarely scrobiculate, spinose. Median preglabellar furrow well developed. Anterior glabellar lobe subtriangular, semiovate or subpentagonal. Posterior glabellar lobe strongly convex in entirety or only in posterior half, with axial glabellar node located level with F1 furrows, basal lobes divided or entire. Pygidial axis with spine or large node on M2 strongly deflecting F2 furrow rearward. Posterior axial lobe long, semiovate to subtriangular, usually with small median tubercle near midlength. Median postaxial furrow well developed or absent.
References
Museum or Author Information
Classification
Phylum:
Arthropoda
Class:
Trilobita
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Ptychagnostidae
Formal Genus Name and Reference:
Triplagnostus HOWELL, 1935c, p. 14
Type Species:
Agnostus gibbus LINNARSSON, 1869, p. 81, OD, types not identified
Images
(Click to enlarge in a new window)
Fig. 225,1a,b. *T. (T.) gibbus (LINNARSSON), Middle Cambrian (Triplagnostus gibbus Zone), Exsulans Limestone; a, cephalon, SGU 4891, Sweden (Brantevik, Skåne), × 8; b, pygidium, SGU 4890, Sweden (Andrarum, Skåne), × 8 (new).
Synonyms
Geographic Distribution
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
40
Beginning Date:
512.3
Ending Stage in Treatise Usage:
Middle Cambrian
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
50
Ending Date:
498.75
Description
Rarely scrobiculate, spinose. Median preglabellar furrow well developed. Anterior glabellar lobe subtriangular, semiovate or subpentagonal. Posterior glabellar lobe strongly convex in entirety or only in posterior half, with axial glabellar node located level with F1 furrows, basal lobes divided or entire. Pygidial axis with spine or large node on M2 strongly deflecting F2 furrow rearward. Posterior axial lobe long, semiovate to subtriangular, usually with small median tubercle near midlength. Median postaxial furrow well developed or absent.