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Hystricurus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Solenopleuracea
Family:
Solenopleuridae
Formal Genus Name and Reference:
Hystricurus RAYMOND, 1913
Type Species:
*Bathyurus conicus BILLINGS, 1859
Images
(Click to enlarge in a new window)
Fig. 204, 4a, b. *H. conicus (Billings), N.Y., 4a, cran., x2, 4 b, pyg., x2 (494), Fig. 204, 4c. H. genalatus Ross, Utah, librigena, x4 (258)
Synonyms
Geographic Distribution
N.Am.-Greenl.-E.Asia
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Cephalon with tapering to subovate glabella, preglabellar field varying in length, fixigenae with narrow to moderately wide anterior and palpebral areas, slender lateral extremities of posterior areas divided into subequal portions by deeply impressed posterior border furrows, medium to long palpebral lobes behind or (rarely) opposite glabellar center and terminating fairly close to posterior border furrows, strongly diverging course of posterior sections of facial sutures from eyes to posterior border furrow, moderately wide librigenae. Thoracic segments with spined or bluntly rounded pleural tips. Pygidium with long axis, narrow border, and evenly curved posterolateral margin. Ventral sutures delimit a small trapezoidal rostral plate
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Solenopleuracea
Family:
Solenopleuridae
Formal Genus Name and Reference:
Hystricurus RAYMOND, 1913
Type Species:
*Bathyurus conicus BILLINGS, 1859
Images
(Click to enlarge in a new window)
Fig. 204, 4a, b. *H. conicus (Billings), N.Y., 4a, cran., x2, 4 b, pyg., x2 (494), Fig. 204, 4c. H. genalatus Ross, Utah, librigena, x4 (258)
Synonyms
Geographic Distribution
N.Am.-Greenl.-E.Asia
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Cephalon with tapering to subovate glabella, preglabellar field varying in length, fixigenae with narrow to moderately wide anterior and palpebral areas, slender lateral extremities of posterior areas divided into subequal portions by deeply impressed posterior border furrows, medium to long palpebral lobes behind or (rarely) opposite glabellar center and terminating fairly close to posterior border furrows, strongly diverging course of posterior sections of facial sutures from eyes to posterior border furrow, moderately wide librigenae. Thoracic segments with spined or bluntly rounded pleural tips. Pygidium with long axis, narrow border, and evenly curved posterolateral margin. Ventral sutures delimit a small trapezoidal rostral plate