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Hemiplethorhynchus
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Rhynchotrematoidea
Family:
Trigonirhynchiidae
Formal Genus Name and Reference:
Hemiplethorhynchus von Peetz, 1898, p. 178
Type Species:
H. fallax, OD
Images
(Click to enlarge in a new window)
Fig. 729a-l. *H. fallax, upper Tournaisian, $a-d$, dorsal, ventral, anterior, and lateral views, Altai, x1$ (Sarytcheva & others, 1963), $e-l$, hypotype, serial sections $1.6, 2.5, 2.85, 3.35$, $3.5, 3.7, 4.35, 4.9 \\mathrm{~mm}$ from posterior, Kuznetzk basin, x3$ (Sartenaer, 1965a).
Synonyms
Greenockia
Geographic Distribution
Altai, Europe, China, North America
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous (Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Lower Carboniferous (Tournaisian)
Ending International Stage:
Tournaisian
Fraction Up In Ending Stage:
100
Ending Date:
346.73
Description
Subcircular to subpentagonal in outline, moderately biconvex. Beak small, erect to incurved, delthyrium with deltidial plates. Fold and sulcus rather weak, but distinct anterior tongue present. Costae fine to medium, simple, angular, from beaks. Dental plates concave medially and slightly convergent ventrally. Dorsal median septum long, low, septalium without cover but anteriorly from septalium, crural bases meet medially, distal parts of crura with V-shaped cross section, open dorsally.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Rhynchotrematoidea
Family:
Trigonirhynchiidae
Formal Genus Name and Reference:
Hemiplethorhynchus von Peetz, 1898, p. 178
Type Species:
H. fallax, OD
Images
(Click to enlarge in a new window)
Fig. 729a-l. *H. fallax, upper Tournaisian, $a-d$, dorsal, ventral, anterior, and lateral views, Altai, x1$ (Sarytcheva & others, 1963), $e-l$, hypotype, serial sections $1.6, 2.5, 2.85, 3.35$, $3.5, 3.7, 4.35, 4.9 \\mathrm{~mm}$ from posterior, Kuznetzk basin, x3$ (Sartenaer, 1965a).
Synonyms
Greenockia
Geographic Distribution
Altai, Europe, China, North America
Age Range
Beginning Stage in Treatise Usage:
Lower Carboniferous (Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Lower Carboniferous (Tournaisian)
Ending International Stage:
Tournaisian
Fraction Up In Ending Stage:
100
Ending Date:
346.73
Description
Subcircular to subpentagonal in outline, moderately biconvex. Beak small, erect to incurved, delthyrium with deltidial plates. Fold and sulcus rather weak, but distinct anterior tongue present. Costae fine to medium, simple, angular, from beaks. Dental plates concave medially and slightly convergent ventrally. Dorsal median septum long, low, septalium without cover but anteriorly from septalium, crural bases meet medially, distal parts of crura with V-shaped cross section, open dorsally.