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Cyrtosymbole
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Proetacea
Family:
Proetidae
Formal Genus Name and Reference:
Cyrtosymbole RUD. RICHTER, 1913
Type Species:
Dechenella ercoli KOENEN, 1886
Images
(Click to enlarge in a new window)
Fig. 298, 1. "C. (C.) escoti (KOENEN), Fr.(Cabrieres); la, cran., X8; 1b, pyg., X4 (460, mod.).
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Dev.
Beginning International Stage:
Frasnian
Fraction Up In Beginning Stage:
0
Beginning Date:
378.9
Ending Stage in Treatise Usage:
L.Carb.
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Exoskeleton of moderate size, some species minute. Cephalon without distinct frontal border, preglabellar field more or less developed, concave; glabella tapering, with 3 pairs of generally pronounced lateral furrows; occipital ring narrowing laterally, occipital lobes not present; anterior sections of facial sutures long, diverging; eyes not far from axial furrows, palpebral lobes distinctly curved; Iibrigenae broad, with genal spines. Thorax with 8 to 10 segments. Pygidium semicircular to slightly elongate, with few segments; pleural fields with 5 (seldom 9) transversely directed ribs, segmental bands not very different in width (exsag.) and height, pleural and interpleural furrows distinct; doublure convex upwards..
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Proetacea
Family:
Proetidae
Formal Genus Name and Reference:
Cyrtosymbole RUD. RICHTER, 1913
Type Species:
Dechenella ercoli KOENEN, 1886
Images
(Click to enlarge in a new window)
Fig. 298, 1. "C. (C.) escoti (KOENEN), Fr.(Cabrieres); la, cran., X8; 1b, pyg., X4 (460, mod.).
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Dev.
Beginning International Stage:
Frasnian
Fraction Up In Beginning Stage:
0
Beginning Date:
378.9
Ending Stage in Treatise Usage:
L.Carb.
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Exoskeleton of moderate size, some species minute. Cephalon without distinct frontal border, preglabellar field more or less developed, concave; glabella tapering, with 3 pairs of generally pronounced lateral furrows; occipital ring narrowing laterally, occipital lobes not present; anterior sections of facial sutures long, diverging; eyes not far from axial furrows, palpebral lobes distinctly curved; Iibrigenae broad, with genal spines. Thorax with 8 to 10 segments. Pygidium semicircular to slightly elongate, with few segments; pleural fields with 5 (seldom 9) transversely directed ribs, segmental bands not very different in width (exsag.) and height, pleural and interpleural furrows distinct; doublure convex upwards..