Halocaridinides trigonophthalma ( Fujino and Shokita, 1975 )

Cai, Y., 2006, Atyid shrimps (Crustacea: Decapoda: Caridea) of the Ryukyu Islands, southern Japan, with descriptions of two new species, Journal of Natural History 40 (38 - 40), pp. 2123-2172: 2130-2133

publication ID

http://doi.org/ 10.1080/00222930601084049

persistent identifier

http://treatment.plazi.org/id/039A9827-FF90-FFF8-CB57-8EBBFCF2ECD7

treatment provided by

Felipe

scientific name

Halocaridinides trigonophthalma ( Fujino and Shokita, 1975 )
status

 

Halocaridinides trigonophthalma ( Fujino and Shokita, 1975)  

Halocaridina (Halocaridinides) trigonophthama Fujino and Shokita, 1975, p 106   , figs.7, 8

[type locality: several wells in Okinawa Island, Ryukyus, Japan].

Halocaridina (Halocaridinides) trigonophthama: Shokita and Nishijima 1976, p 71   ; Shokita

1979, p 201.

Palauatya dasyomma Hart, 1980, p 481   , figs.1–31 [type locality: Anguar Island , Palau, Caroline Islands].

Halocaridinides trigonophthalma: Holthuis 1982, p 31   , fig. 3a–u; Gurney 1984, p 591; Hayashi 1989e, p 497, fig.177; Shokita 2002, p 164; 2003, p 249, fig. 17C; 2006b, p 62; Naruse et al. 2003, p 1; Yoshigou et al. 2003, p 9; Fujita and Shokita 2005a, p 194.

Material examined

Holotype: male, cl 2.4 mm, URB-497, well near Kaneshi, Okinawa Island, Ryukyu Islands , coll S. Shokita, November 1971   . Allotype: 1 female, cl 2.8 mm, URB-498, well near Kaneshi, Okinawa Island, Ryukyu Islands , coll S. Shokita, November 1971   . Paratypes: 2 males, cl 2.0– 2.4 mm, URB-499, well near Kaneshi, Okinawa Island, Ryukyu Islands , coll S. Shokita, November 1971   . Others   : 1 specimen, URB, Shiokawa, Okinawa Island, Ryukyu Islands , coll T. Nagai, March 1997   ; 4 female cl 3.0– 3.6 mm (RUB-ZC-78-81), 1 male cl 2.6 mm (RUB-ZC-82), Hatoma Island, Yaeyama Group, Ryukyu Islands , coll. M. Toda, 18 October 2002   .

Diagnosis

Rostrum short, not reaching beyond end of eyestalk; unarmed. Antennal spine fused fully with inferior orbital angle. Pterygostomian margin broadly rounded. Telson not terminating in a projection, with only two pairs of dorsal spinules on distal two-thirds of telson; with two pairs of distal spines, lateral pair of distal spines distinctly longer than intermediates. Antennular peduncle 0.55 times as long as carapace, stylocerite not reaching to end of basal segment of antennular peduncle. Epipods on first three pereiopods. Merus of first pereiopod as long as ischium; carpus of first pereiopod deeply excavated, subequal to chela in length, 3.3 times as long as high, chela 2.3 times as long as broad, fingers distinctly longer than palm. Merus of second pereiopod as long as ischium; carpus of second pereiopod excavated anteriorly, very slender, seven times as long as high, more than twice longer than chela; chela 2.5 times as long as broad, fingers 1.6 times as long as palm. Propodus of third pereiopod three times as long as dactylus, dactylus 2.5 times as long as wide, with eight spines on flexor margin. Propodus of fifth pereiopods three times as long as dactylus, dactylus 3.5 times as long as broad, with 18–19 spinules on flexor margin. Endopod of male first pleopod subrectangular, no appendix interna, slightly shorter than exopod. Appendix masculina of male second pleopod slender. Uropodal diaeresis with four movable spinules.

Habitat

Anchialine caves.

Remarks

Halocaridinides Fujino and Shokita 1975   , was originally established as a subgenus of Halocaridina   . Palauatya   was established based on Palau material by Hart (1980). Based on a collection from Palau, Holthuis (1982) synonymized Palauatya   with Halocaridinides   and raised the latter to full generic rank. Halocaridinides trigonophthalma   has been found from Okinawa Island, and Hatoma Island of the Ryukyu Islands (Fujiino and Shokita 1975; Shokita 1975, 1979; Naruse et al. 2003), Palau Islands ( Hart 1980; Holthuis 1982) and Guam ( Maciolek 1983). Gordon (1968, in Gordon and Monod 1968) described a new species from a subterranean lake in Kufile, Zanzibar, and doubtfully placed it in the genus Parisia Holthuis 1956   . Gurney (1984) moved it to Halocaridinides   and redescribed it in detail as H. fowleri   after re-examining the types. Halocaridinides trigonophthalma   could be easily distinguished from H. fowleri   by the relative position of the distal end of the antennal carpus (reaching as far as the distal end of the antennular peduncle in H. trigonophthalma   vs. reaching as far as the distal end of the antennal scale in H. fowleri   ). Naruse et al. (2003) used the relative length of the exopod of the third pereiopod against the endopod as one of two characters to differentiate H. trigonophthalma   from H. fowleri   . However this character is too slight to separate two species (see Hart 1980, Fig. 15 View Figure 15 ; Gurney 1984, Fig. 2B View Figure 2 ). The disjunct localities in the West Pacific may reflect a possible passive dispersal path by ocean current as suggested by Smith and William (1981) and Maciolek (1983).

Distribution

Known from the Ryukyu Islands, Japan, Palau, and Guam.

URB

Ryukyu University Department of Zoology

T

Tavera, Department of Geology and Geophysics

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Atyidae

Genus

Halocaridinides

Loc

Halocaridinides trigonophthalma ( Fujino and Shokita, 1975 )

Cai, Y. 2006
2006
Loc

Halocaridinides trigonophthalma: Holthuis 1982 , p 31

Fujita Y & Shokita S 2005: 194
Naruse T & Toda M & Shokita S 2003: 1
Yoshigou H & Tamura H & Iwao M & Izumi R 2003: 9
Hayashi K-I 1989: 497
Gurney AR 1984: 591
Holthuis LB 1982: 31
1982
Loc

Palauatya dasyomma

Hart CW 1980: 481
1980
Loc

Halocaridina (Halocaridinides) trigonophthama:

Shokita S & Nishijima S 1976: 71
1976
Loc

Halocaridina (Halocaridinides) trigonophthama

Fujino T & Shokita S 1975: 106
1975