Asaphiscus
| Asaphiscus Temporal range: Middle Cambrian
| |
|---|---|
| |
| Asaphiscus wheeleri, Cambrian shale, Utah | |
Scientific classification 
| |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | †Artiopoda |
| Class: | †Trilobita |
| Order: | †Ptychopariida |
| Family: | †Asaphiscidae |
| Genus: | †Asaphiscus Meek, 1873 |
| Type species | |
| Asaphiscus wheeleri Meek, 1873
| |
| Species | |
| Synonyms | |
|
Eteraspis Resser, 1935 | |
Asaphiscus is a genus of trilobite that lived in the Cambrian. Its remains have been found in Australia and North America, especially in Utah.
Distribution
[edit | edit source]A. wheeleri occurs in the Middle Cambrian of the United States (Delamaran, Lower Wheeler Shale, Millard County, Utah, 40.0°N, 113.0°W;[1] and Menevian, Wheeler Formation, House Range, Utah, 39.2° N, 113.3° W).[2]
Description
[edit | edit source]
Asaphiscus are average size trilobites of (up to 8 centimetres or 3.1 inches) with a rather flat calcified dorsal exoskeleton of inverted egg-shaped outline, about 1+1⁄2× longer than wide, with the widest point near the back of the headshield (or cephalon). The cephalon is about 40% of the body length, is semi-circular in shape, has wide rounded genal angles, and a well defined border of about 1⁄8× the length of the cephalon. The central raised area of the cephalon (or glabella) is conical in outline with a wide rounded front and is separated from the border by a preglabellar field of about 1⁄8× the length of the cephalon, and has 3 sets of furrows that may be clear or inconspicuous. The articulated middle part of the body (or thorax) has 7-11 segments (9 in A. wheeleri), with rounded tips. The tailshield (or pygidium) is about 30% of the body length, is semi-circular in shape, with a wide flat border, and an entire margin.[3]
Reassigned species
[edit | edit source]Some species originally described as belonging to Asaphiscus have later been reassigned to other genera.[4]
- A. capella = Glyphaspis capella
- A. granulatus = Genevievella granulata
- A. gregarius = Blainia gregarius
- A. minor = Cedaria minor
- A. unispinus = Weeksina unispina
Sources
[edit | edit source]- A Pictorial Guide to Fossils by Gerard Ramon Case
References
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External links
[edit | edit source]- Asaphiscus in the Paleobiology Database
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