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Blackwelderia
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Damesellacea
Family:
Damesellidea
Formal Genus Name and Reference:
Blackwelderia WALCOTT, 1906
Type Species:
Calymene sinensis BERGERON, 1899
Images
(Click to enlarge in a new window)
Fig. 234, 2. *B. sinensis (Bergeron), Kushanian, China (Shantung), exoskel., XI.3 (419)."
Synonyms
Geographic Distribution
Up.E.Asia
Age Range
Beginning Stage in Treatise Usage:
Up.M.Cam.
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
Up.M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Glabella with 2 or 3 pairs of lateral furrows, preglabellar field present, anterior border furrow concave, anterior border rimlike, eye ridges very faint or obsolete, eyes opposite center of glabella, fixigenae with palpebral areas about equal to glabella in width, posterior areas of medium width (exsag.), as long or longer than occipital ring, librigenae with short to medium-length genal spines. Thorax with 13 segments. Pygidium semicircular, 4 axial rings and terminal, pleural fields moderately convex, same as axis in width, 5 pleurae with faint anterior interpleural grooves, border furrow shallow, border narrow, with 7 pairs of subequal to variably long marginal spines. Surface with coarse granules, a fringe of small nodes on posterior margin of librigenae.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Damesellacea
Family:
Damesellidea
Formal Genus Name and Reference:
Blackwelderia WALCOTT, 1906
Type Species:
Calymene sinensis BERGERON, 1899
Images
(Click to enlarge in a new window)
Fig. 234, 2. *B. sinensis (Bergeron), Kushanian, China (Shantung), exoskel., XI.3 (419)."
Synonyms
Geographic Distribution
Up.E.Asia
Age Range
Beginning Stage in Treatise Usage:
Up.M.Cam.
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
Up.M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Glabella with 2 or 3 pairs of lateral furrows, preglabellar field present, anterior border furrow concave, anterior border rimlike, eye ridges very faint or obsolete, eyes opposite center of glabella, fixigenae with palpebral areas about equal to glabella in width, posterior areas of medium width (exsag.), as long or longer than occipital ring, librigenae with short to medium-length genal spines. Thorax with 13 segments. Pygidium semicircular, 4 axial rings and terminal, pleural fields moderately convex, same as axis in width, 5 pleurae with faint anterior interpleural grooves, border furrow shallow, border narrow, with 7 pairs of subequal to variably long marginal spines. Surface with coarse granules, a fringe of small nodes on posterior margin of librigenae.