Eurycercus (Teretifrons) Frey 1975
Creators
Description
Subgenus Eurycercus (Teretifrons) Frey, 1975
Type species. E. glacialis Lilljeborg, 1887. Typified by Frey (1975).
Amended diagnosis. Body uncompressed laterally, without a median dorsal keel. Dorsal head pores located on a flat head shield (no bubble-like projection or a transverse fold in this portion); ring of major head pore not elevated or elevated above head shield surface. Labral keel long, with angled apex reaching tip of antenna I or projecting beyond it. Intestine has a doubled loop; a posterior intestinal caecum absent. Entire shell serves as ephippium.
Comments. According to Frey (1975, P. 293), the diagnosis of this subgenus was: “shell broadly rounded, without a keel except in ephippial females; head pore not projecting at all, which makes the dorsal profile as seen from the side completely smooth and evenly rounded; head shield broadly rounded behind; labral keel large, expanded, acuminate in the middle; intestine with a double loop; no posterior intestinal caecum. In glacialis, in contrast to the other described species, the entire shell serves as the ephippium, with closure of the anterior portion accomplished by a complicated system of transverse infolding. If this occurs also in the other glacialis- like species, it can be elevated to a subgeneric character”. Hann (1990) accepted such diagnosis. But after our re-study of E. nigracanthus and description of E. chernovi sp. nov., the diagnosis needed updating, in particular regarding head pores and ephippium.
Notes
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Linked records
Additional details
Identifiers
Related works
- Is part of
- Journal article: 10.11646/zootaxa.4147.4.1 (DOI)
- Journal article: http://zenodo.org/record/267823 (URL)
- Journal article: http://publication.plazi.org/id/FFF4FFE79C30FF8256342A5FE271FFCE (URL)
- Journal article: http://zoobank.org/550E60AC-54F6-4FB4-8A79-058A0996B598 (URL)
- Is source of
- https://sibils.text-analytics.ch/search/collections/plazi/03CD879F9C31FF8056A32C81E3F8FE1E (URL)
Biodiversity
- Family
- Eurycercidae
- Genus
- Eurycercus
- Kingdom
- Animalia
- Order
- Diplostraca
- Phylum
- Arthropoda
- Scientific name authorship
- Frey
- Taxon rank
- subGenus
- Taxonomic concept label
- Eurycercus (Teretifrons) Frey, 1975 sec. Bekker & Kotov, 2016
References
- Frey, D. G. (1975) Subgeneric differentiation within Eurycercus (Cladocera, Chydoridae) and a new species from Northern Sweden. Hydrobiologia, 46, 263 - 300. http: // dx. doi. org / 10.1007 / BF 00043144
- Lilljeborg, W. (1887) On the Entomostraca collected by Mr. Leonard Stejneger, on Bering Islands, 1882 - 83. Proceedings of the United States National Museum, 10, 154 - 156. http: // dx. doi. org / 10.5479 / si. 00963801.621.154
- Hann, B. J. (1990) Redescription of Eurycercus (Teretifrons) glacialis (Cladocera, Chydoridae) and description of a new species E. (T.) nigracanthus, from Newfoundland, Canada. Canadian Journal of Zoology, 68, 2146 - 2157. http: // dx. doi. org / 10.1139 / z 90 - 298