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Illaenus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Illaenacea
Family:
Illaenidae
Formal Genus Name and Reference:
Illaenus DALMAN, 1827 [non Cryptonymus EICHWALD, 1825 (suppressed, ICZN opinion 508)]
Type Species:
Entomostracites crassicauda Wahlenberg, "1818" ( =1821 ), SD MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. 282, 1a-c. *I. crassicauda (Wailenberg), 1 a, b, ceph., dorsal, ventral, x1.5, 1c, pyg., x1.5 (414)., Fig. 282, 1d. I. sarsi Janusson, hypostoma, x2 (414).
Synonyms
Deucalion, Actinolobus, Actinobolus, ?Svobodapeltis
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Ord.(Arenig.-Llanvirn.)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Ord.(Llanvirn.-Ashgill.)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Thorax with 10 segments, Eyes of moderate size, Rostral flange long, hour-glass-shaped, Anterior wings of hypostoma broad (tr.), quadrangular, Pygidium about as large as cephalon or slightly smaller, axis short, narrowing toward rear
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Illaenacea
Family:
Illaenidae
Formal Genus Name and Reference:
Illaenus DALMAN, 1827 [non Cryptonymus EICHWALD, 1825 (suppressed, ICZN opinion 508)]
Type Species:
Entomostracites crassicauda Wahlenberg, "1818" ( =1821 ), SD MILLER, 1889
Images
(Click to enlarge in a new window)
Fig. 282, 1a-c. *I. crassicauda (Wailenberg), 1 a, b, ceph., dorsal, ventral, x1.5, 1c, pyg., x1.5 (414)., Fig. 282, 1d. I. sarsi Janusson, hypostoma, x2 (414).
Synonyms
Deucalion, Actinolobus, Actinobolus, ?Svobodapeltis
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Ord.(Arenig.-Llanvirn.)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Ord.(Llanvirn.-Ashgill.)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Thorax with 10 segments, Eyes of moderate size, Rostral flange long, hour-glass-shaped, Anterior wings of hypostoma broad (tr.), quadrangular, Pygidium about as large as cephalon or slightly smaller, axis short, narrowing toward rear