Eurycercus (Teretifrons) Frey 1975 ...
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 por...
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Zenodo
2016
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| Online Access: | https://dx.doi.org/10.5281/zenodo.5631046 https://zenodo.org/doi/10.5281/zenodo.5631046 |
| Summary: | 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 ... : Published as part of Bekker, Eugeniya I. & Kotov, Alexey A., 2016, A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic, pp. 351-376 in Zootaxa 4147 (4) on pages 352-353, DOI: 10.11646/zootaxa.4147.4.1, http://zenodo.org/record/267823 ... |
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