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Altunella
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Tetralobulidae
Formal Genus Name and Reference:
Altunella Liu, Zhang, & DI, 1984, p. 160
Type Species:
A. typica, OD
Images
(Click to enlarge in a new window)
Fig. 629, 2a-d. *A. typica, Maleziji Group, Xinjiang, $a$, ventral valve exterior, $b$, dorsal valve exterior, $c$, lateral view, ventral valve on left, $d$, anterior view, ventral valve below, x1.5$ (Liu, Zhang, & Di, 1984).
Synonyms
Geographic Distribution
northwestern China
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (lower Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (lower Caradoc)
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
75
Ending Date:
454.11
Description
Costate shells, length and width nearly equal, very strongly biconvex, uniplication present on the entire valve, interareas narrow, sessile spondylium supported by 2 accessory septa, weak, narrow sessile septalium supported by a short median septum. Interiors poorly known.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Porambonitoidea
Family:
Tetralobulidae
Formal Genus Name and Reference:
Altunella Liu, Zhang, & DI, 1984, p. 160
Type Species:
A. typica, OD
Images
(Click to enlarge in a new window)
Fig. 629, 2a-d. *A. typica, Maleziji Group, Xinjiang, $a$, ventral valve exterior, $b$, dorsal valve exterior, $c$, lateral view, ventral valve on left, $d$, anterior view, ventral valve below, x1.5$ (Liu, Zhang, & Di, 1984).
Synonyms
Geographic Distribution
northwestern China
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (lower Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (lower Caradoc)
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
75
Ending Date:
454.11
Description
Costate shells, length and width nearly equal, very strongly biconvex, uniplication present on the entire valve, interareas narrow, sessile spondylium supported by 2 accessory septa, weak, narrow sessile septalium supported by a short median septum. Interiors poorly known.