Heterocarpus hayashii Crosnier, 1988

Li, Xinzheng & Komai, Tomoyuki, 2003, Pandaloid Shrimps From The Northern South China Sea, With Description Of A New Species Of Plesionika (Crustacea: Decapoda: Caridea), Raffles Bulletin of Zoology 51 (2), pp. 257-275 : 259-260

Heterocarpus hayashii Crosnier, 1988

Heterocarpus sibogae – Chace, 1985: 11 (part), fig. 20; Hayashi, 1986: 118, 119, 268, fig. 76; Chan & Yu, 1987: 57 (part), pl. 2, fig. c.

Heterocarpus hayashii Crosnier, 1988: 67 , fig. 4b, pl. 1d, 3c-e [type locality: Chesterfield Islands]; Hanamura & Evans, 1996: 7, fig. 2.

Material examined. – 4 females (cl 13.3-20.1 mm), 1 ovig. female (cl 28.2 mm) ( IOCAS), CN 33-45 , 19 00’N, 113 00’E, 465 m, sand, AT, coll. H. Li, 17 Feb.1959 ; 1 male (cl 16.7 mm) ( IOCAS), CN K150 B-24, 19 00’N, 112 30’E, 290 m, muddy sand, AT, coll. Z. Tang, 6 Apr.1960 .

Distribution. – Japan, East and South China seas, Philippines, New Caledonia, Samoa, Australia; at depths of 200- 700 m.

Remarks. – Heterocarpus hayashii and H. sibogae are very similar morphologically. When fresh, the two species are readily separated by coloration ( Crosnier, 1988): H. hayashii does not have a red patch on the lateral surface of the third abdominal somite, which is present in H. sibogae . However, morphological differences between the two are rather subtle. Hanamura & Evans (1996) argued that distinguishing features cited by Crosnier (1988) were not always reliable. They showed that only the relative length of the unarmed part of the dorsal margin of the carapace is reliable for discrimination of the two species: the unarmed part occupies 51.9-58.9% of the total length of the carapace in H. hayashii , and 43.5-49.0% in H. sibogae . No information on the coloration in life was available for our specimens, and therefore we identify them with H. hayashii following Hanamura & Evans (1996).