Salmoneus rostratus Barnard, 1962

Marin, Arthur Anker Ivan N., 2006, New Records And Species Of Alpheidae (Crustacea: Decapoda) From Vietnam. Part I. Genus Salmoneus Holthuis, 1955, Raffles Bulletin of Zoology 54 (2), pp. 295-319 : 313

publication ID	https://doi.org/ 10.5281/zenodo.13245424
persistent identifier	https://treatment.plazi.org/id/03AB572D-FFF6-FFA2-FF78-F910FB73D866
treatment provided by	Felipe
scientific name	Salmoneus rostratus Barnard, 1962
status

Treatment

Salmoneus rostratus Barnard, 1962 View in CoL

( Fig. 7b, c View Fig , 14 View Fig )

Salmoneus rostratus Barnard, 1962: 240 View in CoL , Fig. 1 View Fig ; Kensley, 1974: 74; Banner & Banner, 1981: 52, 53; Banner & Banner, 1983: 88; Carvacho, 1989: 255; De Grave & Wilkins, 1997: 633, Fig. 1 View Fig ; Anker, 2003a: 287, Fig. 3c, d View Fig .

Material examined. – 1 ovigerous female (CL 6.4, TL 18.3), 1 non-ovigerous specimen (CL 6.3, TL 18.5)( ZMMU Ma 5449) [dissected], South China Sea, Vietnam, Nhatrang Bay, Tre I., Dam Bay, 12 ° 10'20"N 109 ° 15'30"E, tidal sand-mud flat, extreme low tide, in burrow of goby-associated Alpheus species, bait suction (yabby) pump, coll. I. Marin, 4 Jun.2004; 2 ovigerous females (CL 6.8, TL 18.9 and CL 6.5, TL 18.3)( ZMMU Ma 5450), same collection data as for previous specimens, from a different burrow; 2 ovigerous females (CL 5.8, TL 17.0 and CL 6.5, TL 18.2)( ZMMU Ma 5451), South China Sea, Vietnam, Nhatrang Bay, Tre I., Dam Bay, 12 ° 10'20"N 109 ° 15'30"E, tidal sand-mud flat, in burrow of goby-associated Alpheus species, bait suction (yabby) pump, coll. I. Marin, 17 Jun.2004; 1 ovigerous female (CL 7.2, TL 19.6), 1 non-ovigerous specimen (CL 5.6, TL 16.3)( ZMMU Ma 5452), same collection data as for previous specimens, from a different burrow.

Additional material examined. – 1 ovigerous female (CL and TL not measured)(MNHN-Na 4587), Nosy-Bé, Madagascar, intertidal, coll. B. Opic, 7 Sep.1974, det. Banner 28 Oct.1980 .

Description. – For detailed description see Barnard (1962) and De Grave & Wilkins (1997).

Colour. – Carapace, abdomen, telson, and uropods maroonred; antennae and antennules brilliant white; pereiopods translucent with red tinge (De Grave & Wilkins, 1997) ( Fig. 7b, c View Fig ).

Habitat. – Intertidal sand-mud flat, fringed with mangroves, in burrows of Alpheus species ( A. cf. rapacida , A. sp. aff. bellulus and Alpheus sp. ) associated with gobies ( Cryptocentrus cf. leptocephalus Bleeker, 1876 , and Cryptocentrus sp. ). A burrow was usually inhabited by a pair of S. rostratus , either two ovigerous specimens or one ovigerous and one non-ovigerous specimen. Some burrows also contained amphinomid polychaete worms. The association of S. rostratus with goby-associated burrowing Alpheus was also noted in previous reports (De Grave & Wilkins, 1997; Anker, 2003a), although in Hansa Bay, Papua New Guinea, the specimens were collected in deeper water, precisely at about 11 m (De Grave & Wilkins, 1997).

Remarks. – The present specimens of S. rostratus agree well with material reported from Papua New Guinea (De Grave & Wilkins, 1997) and Phuket, Thailand ( Anker, 2003a). On the other hand, specimens from the western Pacific ( Vietnam, Papua New Guinea) and northeastern Indian Ocean (Phuket) show clear differences with the type material from Madagascar. Some of these differences were already pointed out by De Grave & Wilkins (1997). For instance, the rostrum of most specimens from Nhatrang Bay reaches only to the distal margin of the first segment of the antennular peduncle ( Fig. 14a, b View Fig ), whereas it reaches to the middle of the second segment in the holotype ( Barnard, 1962, Fig. 1a View Fig ) and to 1/4 length of the second segment in the ovigerous female from Nosy-Bé (MNHN-Na 4587) ( Fig. 15a View Fig ). Barnard (1962) did not mention or illustrate the conspicuous postrostral tubercle on the carapace ( Fig. 14b View Fig ) and the three strong spines on the ischium of the third pereiopod ( Fig. 14h View Fig ), but De Grave & Wilkins (1997) examined the type series and confirmed that both features are present in the types. The postrostral tubercle is conspicuous in the MNHN specimen ( Fig. 15b View Fig ), although much less so compared to the Vietnamese specimens ( Fig. 14b View Fig ). The shape and length of the stylocerite appear to be slightly different. In the specimens from Nhatrang Bay, the stylocerite is distally much more slender, slightly overreaching the distal margin of the first segment of the antennular peduncle ( Fig. 14a View Fig ), like in the MNHN specimen ( Fig. 15a View Fig ), while in Barnard’s type, the stylocerite is stouter and is only reaching the distal margin of the first segment ( Barnard, 1962, Fig. 1a View Fig ). Furthermore, in the Nhatrang Bay specimens, the telson is narrower and less tapering ( Fig. 14j View Fig ) compared to that of the type (idem., Fig. 1d View Fig ). Although these differences appear to be slight, they should be taken into account when more material of S. rostratus becomes available, and eventually closely related species are recognized. This is particularly true for the development of the postrostral tubercle, which is hard to overlook when fully developed as in the present specimens ( Fig. 14b View Fig ). The armature of the major chela fingers, as well as most other features, are very similar among the specimens from Nhatrang ( Fig. 14 View Fig ), Nosy-Bé ( Barnard, 1962; see also Fig. 15 View Fig ), Phuket ( Anker, 2003a) and Hansa Bay (De Grave & Wilkins, 1997). Distribution. – Madagascar: Nosy-Bé ( Barnard, 1962; Banner & Banner, 1983); Thailand: Phuket ( Anker, 2003a); Papua New Guinea: Hansa Bay (De Grave & Wilkins, 1997); Vietnam: Nhatrang Bay (present study).