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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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Fossil Image
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.




References



Museum or Author Information