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Visbyella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Dalmanelloidea
Family:
Dalmanellidae
Formal Genus Name and Reference:
Visbyella Walmsley & OTHERS, 1968, p. 306
Type Species:
Orthis visbyensis LINDSTRÖM, 1861, p. 366, OD
Images
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Fig. 575, 3a–h. *V. visbyensis (L INDSTRÖM ), Llandovery, Gotland; a–d, ventral, dorsal, anterior, posterior views of conjoined valves, × 3; e,f, normal, tilted views of ventral interior, × 3; g,h, normal, tilted views of dorsal interior, ×3 (Walmsley & others, 1968).
Synonyms
Geographic Distribution
widespread
Age Range
Beginning Stage in Treatise Usage:
lower Silurian (Llandovery)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
middle Silurian (Wenlock)
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Subcircular, small valves with apical deltidium and hypercline dorsal interarea, ventral interior with recessive dental plates and cordate muscle scar, dorsal interior with trilobed, dorsally facing cardinal process and median septum. lower Silurian (Llandovery)-middle Silurian (Wenlock): widespread.