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Nileus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Nileidae
Formal Genus Name and Reference:
Nileus DALMAN, 1827
Type Species:
Asaphus (Nileus) armadillo
Images
(Click to enlarge in a new window)
Fig. 267, 1. *N. armadillo, Swed., 1a, ceph., ventral showing hypostoma, x1 (62), 1 b, exoskel., x1 (1)"
Synonyms
Geographic Distribution
Eu.-E.N.Am.-E.Asia
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Trema-doc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Dorsal exoskeleton strictly parallel-sided, evenly rounded at both ends, strongly and almost evenly convex transversely, Cephalon subreniform, evenly convex, with indistinctly defined, narrow, threadlike border, occipital furrow effaced, glabella slightly convex, almost parallel-sided, indistinctly defined anteriorly, anterior and posterior areas of fixigenae extremely narrow, eyes large, semicircular, librigenae narrow, with rounded, spineless genal angles, Thorax of 8 segments, minutely pitted
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Nileidae
Formal Genus Name and Reference:
Nileus DALMAN, 1827
Type Species:
Asaphus (Nileus) armadillo
Images
(Click to enlarge in a new window)
Fig. 267, 1. *N. armadillo, Swed., 1a, ceph., ventral showing hypostoma, x1 (62), 1 b, exoskel., x1 (1)"
Synonyms
Geographic Distribution
Eu.-E.N.Am.-E.Asia
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Trema-doc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Dorsal exoskeleton strictly parallel-sided, evenly rounded at both ends, strongly and almost evenly convex transversely, Cephalon subreniform, evenly convex, with indistinctly defined, narrow, threadlike border, occipital furrow effaced, glabella slightly convex, almost parallel-sided, indistinctly defined anteriorly, anterior and posterior areas of fixigenae extremely narrow, eyes large, semicircular, librigenae narrow, with rounded, spineless genal angles, Thorax of 8 segments, minutely pitted