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Rostricellula
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Rhynchotrematoidea
Family:
Trigonirhynchiidae
Formal Genus Name and Reference:
Rostricellula Ulrich & COOPER, 1942, p. 625
Type Species:
R. rostrata, OD
Images
(Click to enlarge in a new window)
Fig. 719, 1a-b. *R. rostrata, Lebanon Formation, Middle Ordovician, Clinton, Tennessee, USA, $a-e$, holotype, dorsal, ventral, posterior, anterior, and lateral views, x1, f$, paratype, ventral valve interior, x2, g-h$, paratypes, dorsal valve interiors showing cardinalia and crura, x4$ (Ulrich & Cooper, 1942).
Synonyms
Longxianirhynchia
Geographic Distribution
North America, Europe, Asia
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
lower Silurian (Llandovery)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Subtrigonal to subpentagonal outline, moderately biconvex. Beak erect to incurved, delthyrium open to partly closed by incipient deltidial plates. Fold and sulcus distinct with rounded margins, anterior commissure uniplicate, tongue low, serrate. Costae fine to medium, simple, extending from umbones, crossed by concentric growth lamellae. Dental plates distinct but short. Dorsal median septum to midlength, septalium short, without cover, hinge plates divided anterior of septalium, crural bases subhorizontal, crura distally slender, ventrally curved.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Rhynchotrematoidea
Family:
Trigonirhynchiidae
Formal Genus Name and Reference:
Rostricellula Ulrich & COOPER, 1942, p. 625
Type Species:
R. rostrata, OD
Images
(Click to enlarge in a new window)
Fig. 719, 1a-b. *R. rostrata, Lebanon Formation, Middle Ordovician, Clinton, Tennessee, USA, $a-e$, holotype, dorsal, ventral, posterior, anterior, and lateral views, x1, f$, paratype, ventral valve interior, x2, g-h$, paratypes, dorsal valve interiors showing cardinalia and crura, x4$ (Ulrich & Cooper, 1942).
Synonyms
Longxianirhynchia
Geographic Distribution
North America, Europe, Asia
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Llanvirn)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
lower Silurian (Llandovery)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Subtrigonal to subpentagonal outline, moderately biconvex. Beak erect to incurved, delthyrium open to partly closed by incipient deltidial plates. Fold and sulcus distinct with rounded margins, anterior commissure uniplicate, tongue low, serrate. Costae fine to medium, simple, extending from umbones, crossed by concentric growth lamellae. Dental plates distinct but short. Dorsal median septum to midlength, septalium short, without cover, hinge plates divided anterior of septalium, crural bases subhorizontal, crura distally slender, ventrally curved.