Abstract
Chinese grass shrimp, Palaemonetes sinensis (Sollaud, 1911) were collected from inland waters of Nao-shima Island and Awa-shima Island, Seto Inland Sea, western Japan. The appearance of P. sinensis is thought to be due to the escape of imported shrimps used as sport fishing bait. P. sinensis looks conspicuously like the native freshwater shrimp, Palaemon paucidens De Haan, 1844. However, the two species have different eye sizes and differences in three diagonal stripes on the carapace. We provide a simple method using eye size and carapace color pattern to enable preliminary differentiation of the two species in the field.
Highlights
Chinese grass shrimp, Palaemonetes sinensis (Sollaud, 1911) (Figure 1A, B) is known from China, Myanmar, southeastern Siberia and Sakhalin (Holthuis 1950; Liu et al 1990; Li et al 2007; Cai and Dai 1999; Cai and Ng 2002; Labay and Barabanshikov 2009; Labay 2011)
Before 1990, P. sinensis had not been reported from Japan (Liu et al 1990)
The specimens identified as P. sinensis had mandibles without a palp (Figure 4A), and other characters that agree well with the previously published descriptions (Sollaud 1911; Kemp 1918; Holthuis 1950; Liu et al 1990; Bruce 1994; Li et al 2007)
Summary
Palaemonetes sinensis (Sollaud, 1911) (Figure 1A, B) is known from China, Myanmar, southeastern Siberia and Sakhalin (Holthuis 1950; Liu et al 1990; Li et al 2007; Cai and Dai 1999; Cai and Ng 2002; Labay and Barabanshikov 2009; Labay 2011). Before 1990, P. sinensis had not been reported from Japan (Liu et al 1990). Recently P. sinensis was discovered in an inland waterbody located in Shizuoka Prefecture, central Japan (Oonuki et al 2010) (Figure 2). P. sinensis has an abbreviated larval development for adaptation to freshwater life (Shen 1939).
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