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Uncinulus
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Uncinuloidea
Family:
Uncinulidae
Formal Genus Name and Reference:
Uncinulus BAYLE, 1878, pl. 11, fig. 11, 12, 15, 16 expl.
Type Species:
Hemithyris subwilsoni d'Orbigny, 1850 in 18491852, p. 92, SD OEHLERT, 1884, p. 423
Images
(Click to enlarge in a new window)
Fig. 739, 2a-p. *from anterior, x2$ (Schmidt, 1965b).-Fig. 739, 2q-s. Uncinulus, marginal spines (schematic), $q$, both valves connected, slightly opened, $r$, dorsal valve, $s$, ventral valve, approximately x1.5$ (Schmidt, 1937).
Synonyms
Tridensilis, Uncina
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Lochkovian)
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Middle Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
Medium to large size, subcircular to subpentagonal outline, hinge line strophic, articulation with squamae and glottae, strongly biconvex to globular profile, anterior margin and flanks vertical. Beak erect to incurved, foramen absent or minute. Dorsal fold and ventral sulcus weak but rectangular to subrectangular anterior tongue distinct. Costae fine, from beaks, some bifurcation and intercalation, grooved at commissure to accommodate marginal spines. Dental plates well developed, convex medially, umbonal cavities commonly filled with callus, ventral muscle area deeply impressed, divided by thin septum. Septalium small, usually filled with callus, dorsal median septum buried in callus, cardinal process wide, multilobed, filling posterior of septalial cavity.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Uncinuloidea
Family:
Uncinulidae
Formal Genus Name and Reference:
Uncinulus BAYLE, 1878, pl. 11, fig. 11, 12, 15, 16 expl.
Type Species:
Hemithyris subwilsoni d'Orbigny, 1850 in 18491852, p. 92, SD OEHLERT, 1884, p. 423
Images
(Click to enlarge in a new window)
Fig. 739, 2a-p. *from anterior, x2$ (Schmidt, 1965b).-Fig. 739, 2q-s. Uncinulus, marginal spines (schematic), $q$, both valves connected, slightly opened, $r$, dorsal valve, $s$, ventral valve, approximately x1.5$ (Schmidt, 1937).
Synonyms
Tridensilis, Uncina
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Lochkovian)
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Middle Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
Medium to large size, subcircular to subpentagonal outline, hinge line strophic, articulation with squamae and glottae, strongly biconvex to globular profile, anterior margin and flanks vertical. Beak erect to incurved, foramen absent or minute. Dorsal fold and ventral sulcus weak but rectangular to subrectangular anterior tongue distinct. Costae fine, from beaks, some bifurcation and intercalation, grooved at commissure to accommodate marginal spines. Dental plates well developed, convex medially, umbonal cavities commonly filled with callus, ventral muscle area deeply impressed, divided by thin septum. Septalium small, usually filled with callus, dorsal median septum buried in callus, cardinal process wide, multilobed, filling posterior of septalial cavity.