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Ductina
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Phacopida
Superfamily:
Phacopacea
Family:
Phacopidea
Formal Genus Name and Reference:
Ductina Richter & RICHTER, 1931
Type Species:
Phacopidella dictifrons Richter & RICHTER, 1923
Images
(Click to enlarge in a new window)
Fig. 369, 2. *D. ductifrons (Richter & Richter), Ger. (Dill Basin), 2a, b, ceph., dorsal, side, 2c, ceph. margin from below, showing vincular furrows only at lateral extremities, × 0.9 (474n)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U. Dev.
Beginning International Stage:
Frasnian
Fraction Up In Beginning Stage:
0
Beginning Date:
378.9
Ending Stage in Treatise Usage:
U. Dev.
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Cephalon semicircular, margin evenly rounded, glabella with anterolateral recurved wings, confluent with marginal border, 2p and 3p lateral glabellar furrows absent on surface, 1p disappearing in median part, "intercalating ring" undivided, eyes and palpebral lobes absent, facial sutures restricted entirely to margin (alone among Phacopidae), genal angles rounded, not truncated. Pygidium large, axis narrow, long, axial ridge present.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Phacopida
Superfamily:
Phacopacea
Family:
Phacopidea
Formal Genus Name and Reference:
Ductina Richter & RICHTER, 1931
Type Species:
Phacopidella dictifrons Richter & RICHTER, 1923
Images
(Click to enlarge in a new window)
Fig. 369, 2. *D. ductifrons (Richter & Richter), Ger. (Dill Basin), 2a, b, ceph., dorsal, side, 2c, ceph. margin from below, showing vincular furrows only at lateral extremities, × 0.9 (474n)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U. Dev.
Beginning International Stage:
Frasnian
Fraction Up In Beginning Stage:
0
Beginning Date:
378.9
Ending Stage in Treatise Usage:
U. Dev.
Ending International Stage:
Famennian
Fraction Up In Ending Stage:
100
Ending Date:
359.3
Description
Cephalon semicircular, margin evenly rounded, glabella with anterolateral recurved wings, confluent with marginal border, 2p and 3p lateral glabellar furrows absent on surface, 1p disappearing in median part, "intercalating ring" undivided, eyes and palpebral lobes absent, facial sutures restricted entirely to margin (alone among Phacopidae), genal angles rounded, not truncated. Pygidium large, axis narrow, long, axial ridge present.