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Leptelloidea
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Leptellinidae
Formal Genus Name and Reference:
Leptelloidea JONES, 1928, p. 385
Type Species:
Plectambonites schmidti var. leptelloides BEKKER, 1921, p. 68, OD
Images
(Click to enlarge in a new window)
Fig. 208, 1a-f. *L. leptelloides (Beккеr), Kukruse Formation, lower Caradoc, Kohtla-Järve, Estonia, a, dorsal view of conjoined valves, USNM 84257c, X3 (Cooper, 1956), $b, c$, ventral interior, viewed ventrally, from anterior, TAGI BR 93, $\\times_{3}$ (new), $d-f$, dorsal interior viewed laterally, $\\mathbf{X}_{3}$, dorsally, $\\mathbf{X}_{3}$, posteriorly, x5$, BMNH BB 5169 (Cocks & Rong, 1989)."
Synonyms
Geographic Distribution
Europe, Burma
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 (Caradoc)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
Strongly concavoconvex profile, unequally parvicostellate ornament, very small deltidial plates, small chilidium, distinctive articulation including pits, accessory teeth in ends of dental plates, corresponding structures in dorsal valve, large bilobed ventral muscle scars extending to about half valve length (much longer than Leptellina but not so wide as in Dulankarella), adductor scars enclosed by diductor scars, large cardinal process projecting posteriorly from hinge line, but cardinal process separate from socket plates, dorsal median septum merging with bilobed elevated platform.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Plectambonitoidea
Family:
Leptellinidae
Formal Genus Name and Reference:
Leptelloidea JONES, 1928, p. 385
Type Species:
Plectambonites schmidti var. leptelloides BEKKER, 1921, p. 68, OD
Images
(Click to enlarge in a new window)
Fig. 208, 1a-f. *L. leptelloides (Beккеr), Kukruse Formation, lower Caradoc, Kohtla-Järve, Estonia, a, dorsal view of conjoined valves, USNM 84257c, X3 (Cooper, 1956), $b, c$, ventral interior, viewed ventrally, from anterior, TAGI BR 93, $\\times_{3}$ (new), $d-f$, dorsal interior viewed laterally, $\\mathbf{X}_{3}$, dorsally, $\\mathbf{X}_{3}$, posteriorly, x5$, BMNH BB 5169 (Cocks & Rong, 1989)."
Synonyms
Geographic Distribution
Europe, Burma
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 (Caradoc)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
Strongly concavoconvex profile, unequally parvicostellate ornament, very small deltidial plates, small chilidium, distinctive articulation including pits, accessory teeth in ends of dental plates, corresponding structures in dorsal valve, large bilobed ventral muscle scars extending to about half valve length (much longer than Leptellina but not so wide as in Dulankarella), adductor scars enclosed by diductor scars, large cardinal process projecting posteriorly from hinge line, but cardinal process separate from socket plates, dorsal median septum merging with bilobed elevated platform.