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- Title
Discrimination of two freshwater shrimps, Palaemon paucidens De Haan, 1844 and P. sinensis (Sollaud, 1911) using plumose setae of telson and appendix masculina.
- Authors
Tadashi Imai; Kazuki Hayashi; Masayuki Nakaso; Seinen Chow; Kenji Nohara; Takakiyo Oonuki
- Abstract
Live specimens of two freshwater shrimps, Palaemon paucidens De Haan, 1844 and P. sinensis (Sollaud, 1911) can be distinguished from the specific carapace color patterns. However, color pattern of specimen preserved in ethanol or diluted formalin slowly fades and is eventually lost. We re-examined previous information and chose the number of plumose setae on distal end of telson and appendix masculina as new identification characters. Number of plumose setae (average, range) was more in P. sinensis (9.0, 4-14) than in P. paucidens (A type, 2.1, 2-3; B type, 2.0, 1-3). Form and lateral setae arrangement of appendix masculina were found to be different between these two species. These characters cannot be applied to females and young males as well as individuals with a malformed telson. Combining these characteristics with those previously described (the presence or absence of a subterminal tooth on the upper edge of rostrum and different eye size etc.) will enable identification of P. paucidens and P. sinensis even in color faded state more reliable.
- Subjects
SHRIMPS; PALAEMON; ETHANOL; TEETH; SPECIES
- Publication
Biogeography, 2018, Vol 20, p103
- ISSN
1345-0662
- Publication type
Article