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Plectambonites

Classification

    Phylum:  
Brachiopoda
    Class:  
Strophomenata
    Order:  
Strophomenida
    Superfamily:  
Plectambonitoidea
    Family:  
Plectambonitidae
    Formal Genus Name and Reference:  
Plectambonites PANDER, 1830, p. 90
    Type Species:  
P. planissimus, SD Hall & CLARKE, 1892, p. 296


Images

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Fossil Image
Fig. 197, 1a-e. *P. planissimus, Aseri Horizon, upper Llanvirn, $a-c$, ventral, dorsal, lateral views of conjoined valves, Pavlovsk, TAGI BR 345, x3$, $d$, ventral interior, Pavlovsk, TAGI BR 346, $X_{3}$, $e$, dorsal interior, Putilovo, St. Petersburg, Russia, BMNH BC 13030, $\\times_{3}$ (new).


Synonyms



Geographic Distribution

Baltic


Age Range

    Beginning Stage in Treatise Usage:  
Ordovician (Llanvirn)
    Beginning International Stage:  
Dapingian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
471.26
    Ending Stage in Treatise Usage:  
Ordovician (Llandeilo)
    Ending International Stage:  
Darriwilian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
458.18


Description

Concavoconvex profile, distinctive unequally parvicostellate ornament but not with granular texture, small chilidium, pseudodeltidium not filling delthyrium, denticles over half valve width, dental plates present, confining posterolateral part of ventral muscle field that is flabellate, open anteriorly, similar to Plectella but more convex (sometimes geniculate), with side septa in dorsal valve more pronounced, more numerous, more complex, weak dorsal platform present.




References



Museum or Author Information