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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

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Fossil Image
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

Bayle, 1878, Schmidt, 1965, Schmidt, 1937