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Shumardia
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Conocoryphacea
Family:
Shumardiidae
Formal Genus Name and Reference:
Shumardia BILLINGS, 1862
Type Species:
S. granulosa
Images
(Click to enlarge in a new window)
Fig. 183. S. pusilla (Sars), L.Ord. (Tremadoc.), Eng., exoskel. (reconstr.), x22.5 (475).
Synonyms
Geographic Distribution
Eu.-N.Am.-S. Am.-Asia
Age Range
Beginning Stage in Treatise Usage:
M.Cam., Upper Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
40
Beginning Date:
512.3
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Glabella wide, slightly clavate, strongly inflated, with pair of eyelike lobes at anterior corners delimited by forward-curved anterior pair of lateral furrows, a pair of notches in glabellar margin representing a posterior pair of glabellar furrows, genal angles pointed. Thorax slightly narrower than cephalon, axis wide, strongly tapering, with wide, deeply impressed axial furrows, narrow pleural regions with obliquely backward-curved, pointed pleural extremities, and macropleural 4th thoracic segment terminating in long, backward-directed spines. Pygidium subquadrate to semicircular or (rarely) subtriangular in outline, with strongly tapering axis. Surface of thorax and pygidium bearing transverse rows of tubercles, a row on each axial ring and 1 or 2 rows on each pleura, pygidium with tuberculated border in some species
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Conocoryphacea
Family:
Shumardiidae
Formal Genus Name and Reference:
Shumardia BILLINGS, 1862
Type Species:
S. granulosa
Images
(Click to enlarge in a new window)
Fig. 183. S. pusilla (Sars), L.Ord. (Tremadoc.), Eng., exoskel. (reconstr.), x22.5 (475).
Synonyms
Geographic Distribution
Eu.-N.Am.-S. Am.-Asia
Age Range
Beginning Stage in Treatise Usage:
M.Cam., Upper Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
40
Beginning Date:
512.3
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Glabella wide, slightly clavate, strongly inflated, with pair of eyelike lobes at anterior corners delimited by forward-curved anterior pair of lateral furrows, a pair of notches in glabellar margin representing a posterior pair of glabellar furrows, genal angles pointed. Thorax slightly narrower than cephalon, axis wide, strongly tapering, with wide, deeply impressed axial furrows, narrow pleural regions with obliquely backward-curved, pointed pleural extremities, and macropleural 4th thoracic segment terminating in long, backward-directed spines. Pygidium subquadrate to semicircular or (rarely) subtriangular in outline, with strongly tapering axis. Surface of thorax and pygidium bearing transverse rows of tubercles, a row on each axial ring and 1 or 2 rows on each pleura, pygidium with tuberculated border in some species