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Idiospira
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Lissatrypoidea
Family:
Septatrypidae
Formal Genus Name and Reference:
Idiospira COOPER, 1956a, p. 690
Type Species:
Camerella panderi BILLINGS, 1859b, p. 302, OD
Images
(Click to enlarge in a new window)
Fig. 996, 1a-h. *I. panderi (Billings), middle Caradoc, Ontario, Canada, a-e, dorsal, ventral, lateral, anterior, posterior, × 3, f-g, serial sections, h, reconstruction of brachidia, × 4 (Copper, 1986b).
Synonyms
Geographic Distribution
North America, Eurasia
Age Range
Beginning Stage in Treatise Usage:
Ordovician (middle Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
75
Beginning Date:
454.11
Ending Stage in Treatise Usage:
Ordovician (Ashgill), Silurian (?Llandovery)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Small to medium, ovoid, biconvex-dorsibiconvex, smooth to weakly corrugated anteriorly, small, orthocline-hypercline area, apical foramen, deltidial plates obscured, minute, usually corrugated, subangular to rounded, plicate commissure, teeth with large dental cavities, weak dorsal septum, thin socket plates, spiralia dorsomedial with fewer than 6 whorls, posterodorsal jugum. [Externally similar to Septatrypa or Hircinisca, but smaller shell, possessing jugum instead of jugal processes, thicker hinge plate.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Lissatrypoidea
Family:
Septatrypidae
Formal Genus Name and Reference:
Idiospira COOPER, 1956a, p. 690
Type Species:
Camerella panderi BILLINGS, 1859b, p. 302, OD
Images
(Click to enlarge in a new window)
Fig. 996, 1a-h. *I. panderi (Billings), middle Caradoc, Ontario, Canada, a-e, dorsal, ventral, lateral, anterior, posterior, × 3, f-g, serial sections, h, reconstruction of brachidia, × 4 (Copper, 1986b).
Synonyms
Geographic Distribution
North America, Eurasia
Age Range
Beginning Stage in Treatise Usage:
Ordovician (middle Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
75
Beginning Date:
454.11
Ending Stage in Treatise Usage:
Ordovician (Ashgill), Silurian (?Llandovery)
Ending International Stage:
Telychian
Fraction Up In Ending Stage:
100
Ending Date:
432.93
Description
Small to medium, ovoid, biconvex-dorsibiconvex, smooth to weakly corrugated anteriorly, small, orthocline-hypercline area, apical foramen, deltidial plates obscured, minute, usually corrugated, subangular to rounded, plicate commissure, teeth with large dental cavities, weak dorsal septum, thin socket plates, spiralia dorsomedial with fewer than 6 whorls, posterodorsal jugum. [Externally similar to Septatrypa or Hircinisca, but smaller shell, possessing jugum instead of jugal processes, thicker hinge plate.]