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Holorhynchus
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Pentameroidea
Family:
Virgianidae
Formal Genus Name and Reference:
Holorhynchus KIAER, 1902, p. 68
Type Species:
H. giganteus, OD
Images
(Click to enlarge in a new window)
Fig. 645 a–g. *H. (H.) giganteus, Sandvik, Oslo region, Stage 5; a–d, ventral, dorsal, lateral, posterior views of articulated specimen, ×1; e–f, dorsal and posterior views of dorsal mold, ×1; g, dorsal view of dorsal interior mold, ×1.5 (Boucot, Johnson, & Rubel, 1971)
Synonyms
Geographic Distribution
Eurasia, North America (including Alaska)
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (middle Ashgill)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
85
Beginning Date:
446.34
Ending Stage in Treatise Usage:
Silurian (middle Llandovery)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
Smooth, strongly ventribiconvex, spondylium unsupported by median septum
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Pentameroidea
Family:
Virgianidae
Formal Genus Name and Reference:
Holorhynchus KIAER, 1902, p. 68
Type Species:
H. giganteus, OD
Images
(Click to enlarge in a new window)
Fig. 645 a–g. *H. (H.) giganteus, Sandvik, Oslo region, Stage 5; a–d, ventral, dorsal, lateral, posterior views of articulated specimen, ×1; e–f, dorsal and posterior views of dorsal mold, ×1; g, dorsal view of dorsal interior mold, ×1.5 (Boucot, Johnson, & Rubel, 1971)
Synonyms
Geographic Distribution
Eurasia, North America (including Alaska)
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (middle Ashgill)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
85
Beginning Date:
446.34
Ending Stage in Treatise Usage:
Silurian (middle Llandovery)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
Smooth, strongly ventribiconvex, spondylium unsupported by median septum