Glyptagnostus reticulatus
Glyptagnostus reticulatus Temporal range:
| |
---|---|
Glyptagnostus reticulatus cephalon | |
Glyptagnostus reticulatus pygidium | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | †Trilobita (?) |
Order: | †Agnostida |
Family: | †Glyptagnostidae |
Genus: | †Glyptagnostus |
Species: | †G. reticulatus
|
Binomial name | |
†Glyptagnostus reticulatus (Angelin, 1851)
| |
Synonyms | |
|
Glyptagnostus reticulatus is a
Description
Like all members of the
Like other members of the genus, the cephalon always exhibits a pair of
Three subspecies were previously proposed for Glyptagnostus reticulatus:[2]
- Glyptagnostus reticulatus reticulatus (Angelin, 1851)
- Glyptagnostus reticulatus angelini (Resser, 1938)
- Glyptagnostus reticulatus nodulosus Westergård, 1947
Two of the subspecies, Glyptagnostus reticulatus reticulatus and Glyptagnostus reticulatus angelini, were proposed by the American
According to Palmer, Glyptagnostus reticulatus angelini can be distinguished from the nominate subspecies Glyptagnostus reticulatus reticulatus by a third (distal) pygidial axial lobe that is less than 7/10th of the length of the second lobe. Glyptagnostus reticulatus angelini also has poorly developed longitudinal furrows outlining the pygidial axis and a variable degree of reticulation. Glyptagnostus reticulatus reticulatus, in contrast, has well-developed longitudinal furrows surrounding the pygidial axis and strongly reticulate patterns (though they are less convex).[2]
The Australian paleontologist
In 2000, the
Taxonomy
Glyptagnostus reticulatus was first described by the Swedish paleontologist
The species was also originally considered as the type species of the genus
Glyptagnostus reticulatus is classified under the genus Glyptagnostus of the family Glyptagnostidae.[8] The generic name is derived from Ancient Greek γλυπτός (glyptos, 'engraved') and άγνωστος (ágnostos, "unknown"). The specific name is derived from Latin reticulatus ('net-like').[7]
Distribution
Glyptagnostus reticulatus has a cosmopolitan distribution. It has been described from Antarctica, Argentina, Australia, Canada, China, Denmark, Kazakhstan, Norway, Russia, South Korea, Sweden, the United Kingdom, and the United States.[4]
Biostratigraphy
Glyptagnostus reticulatus is used in
References
- ^ Samuel M. Gon III. "Agnostida Fact Sheet". A Guide to the Orders of Trilobites. Retrieved 18 November 2012.
- ^ a b c d e f Allison R. Palmer (1962). Glyptagnostus and Associated Trilobites in the United States (PDF). Geological Survey Professional paper 374-F. United States Geological Survey, US Department of the Interior, United States Government Printing Office. p. B27.
- S2CID 128258620.
- ^ .
- ^ Nils Peter Angelin (1851–1878). Gustaf Lindström (ed.). Palæontologica Scandinavica, Pars I: Crustacea Formationis Transitionis. Holmiæ. pp. 8, pl.6, f.10.
- ^ "Glyptagnostus reticulatus". Paleobiology Database. Retrieved 20 November 2012.
- ^ .
- ^ Allison R. Palmer (1968). "Cambrian trilobites of east-central Alaska". Lower paleozoic paleontology and stratigraphy, east-central Alaska. Geological Survey Professional paper 559-B. United States Geological Survey, US Department of the Interior, United States Government Printing Office. p. B27.
External links
- Media related to Glyptagnostus reticulatus at Wikimedia Commons