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Asaphellus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Asaphidae
Formal Genus Name and Reference:
Asaphellus Callaway, 1877
Type Species:
Asaphus homfrayi SALTER, 1866
Images
(Click to enlarge in a new window)
Figs. 254, Fig. 255. *A. homfrayi (Salter), Eng., 254, 5, hypostoma, x1.5 (421), 255, carapace (reconstr.), x1.5 (414n).
Synonyms
Hemigyraspis
Geographic Distribution
Eng.-Wales-E.N.Am.-?N.Arg.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
477.08
Description
cephalon and pygidium with concave border, frontal area moderately broad (in type species about 0.13 of total length of cranidium), cephalic axis flattened, mostly poorly defined, eyes small, slightly in front of transverse mid-line of cranidium, posterior border furrow distinct, genal angles produced into spines. Hypostoma with slightly concave to rounded posterior margin. Thoracic axis considerably narrower than pleurae. Pygidium fairly broad, flattened, with narrow well-defined axis, pleural fields with very faint to obsolete ribs, doublure narrow, as in Megistaspis.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Asaphidae
Formal Genus Name and Reference:
Asaphellus Callaway, 1877
Type Species:
Asaphus homfrayi SALTER, 1866
Images
(Click to enlarge in a new window)
Figs. 254, Fig. 255. *A. homfrayi (Salter), Eng., 254, 5, hypostoma, x1.5 (421), 255, carapace (reconstr.), x1.5 (414n).
Synonyms
Hemigyraspis
Geographic Distribution
Eng.-Wales-E.N.Am.-?N.Arg.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
477.08
Description
cephalon and pygidium with concave border, frontal area moderately broad (in type species about 0.13 of total length of cranidium), cephalic axis flattened, mostly poorly defined, eyes small, slightly in front of transverse mid-line of cranidium, posterior border furrow distinct, genal angles produced into spines. Hypostoma with slightly concave to rounded posterior margin. Thoracic axis considerably narrower than pleurae. Pygidium fairly broad, flattened, with narrow well-defined axis, pleural fields with very faint to obsolete ribs, doublure narrow, as in Megistaspis.