Salmoneus alpheophilus Anker & Marin, 2006

Anker, Arthur, Pratama, Idham Sumarto, Firdaus, Muhammad & Rahayu, Dwi Listyo, 2015, On some interesting marine decapod crustaceans (Alpheidae, Laomediidae, Strahlaxiidae) from Lombok, Indonesia, Zootaxa 3911 (3), pp. 301-342 : 323

Salmoneus alpheophilus Anker & Marin, 2006

( Figs. 16 , 17 )

Salmoneus alpheophilus Anker & Marin 2006: 310 , figs 12, 13.

Material examined. Indonesia. 1 non-ov. specimen ( MZB Cru 4052), western Lombok, Sira, seagrass flat with some muddy areas, burrow, suction pump and digging/sieving, 0.2–0.5 m, leg. D.L. Rahayu et al., 13 May 2014 [LB-St4-05]; 1 non-ov. specimen ( RMNH. CRUS.D.56748), same collection data [LB-St4-14]; 1 ov. specimen ( RMNH. CRUS.D.56749), same collection data [LB-St4-21]; 1 non-ov. specimen ( OUMNH.ZC. 2014-10-18), same collection data [LB-St4-41B].

Taxonomic account. See Anker & Marin (2006).

Habitat. Near-shore sand and sand-mud flats, usually with some rubble-gravel component and fringed by mangroves or seagrass beds; associated with burrows of snapping shrimps, Alpheus spp. Depth range: intertidal and shallow subtidal (around 0–5 m).

Distribution. Indo-West Pacific: Vietnam and Indonesia (new record) (Anker & Marin 2006; present study).

Remarks. Salmoneus alpheophilus was hitherto known only from the type locality in Nhatrang Bay, southern Vietnam. Thus, the Lombok material of S. alpheophilus represents a new record for Indonesia and a significant range extension for this infaunal alpheid shrimp. In addition, S. alpheophilus was recently found at several other, even more distant Indo-West Pacific localities (Anker, in prep.).

Anker & Marin (2006) described the colouration of S. alpheophilus as “white-semitransparent, eggs or gonads bright yellow”. However, most specimens from Lombok had red chromatophores on particular areas of the carapace, abdomen and some appendages. In most individuals ( Fig. 16 , 17 A), the red chromatophores were present on central and posterior areas of the carapace, first and fourth abdominal somite, posterior area of the sixth abdominal somite, and telson; however, they were particularly abundant only on the carapace and first and fourth abdominal somite. In addition, a few red chromatophores were occasionally present on the third article of the antennular peduncle ( Fig. 16 A) or second abdominal somite ( Fig. 17 A). In the extremely contracted state, the chromatophores were barely visible and the shrimps appeared close to colourless to a naked eye, as described by Anker & Marin (2006). Indeed, in some specimens, the abdominal chromatophores were barely discernible ( Fig. 17 B).

Figures

FIGURE 16. Salmoneus alpheophilus Anker & Marin, 2006: non-ovigerous specimen (cl 5.1 mm) from Sira, Lombok, Indonesia (MZB Cru 4052), A—dorsal view; B—lateral view.

FIGURE 17. Salmoneus alpheophilus Anker & Marin, 2006: A—ovigerous specimen (cl 6.5 mm) from Sira, Lombok, Indonesia (RMNH. CRUS. D. 56749), lateral view; B—non-ovigerous specimen (cl 4.3 mm) from the same locality (OUMNH. ZC. 2014 - 10 - 18), lateral view.