Salmoneus carvachoi , Anker, Arthur, 2007

Anker, Arthur, 2007, New species and records of alpheid shrimps, genera Salmoneus Holthuis and Parabetaeus Coutière, from the tropical western Atlantic (Decapoda, Caridea), Zootaxa 1653, pp. 21-39: 27-29

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Salmoneus carvachoi

n. sp.

Salmoneus carvachoi  n. sp.

Fig. 3View FIGURE 3

Salmoneus ortmanni  (not Rankin, 1898) – Carvacho, 1979: 453; Christoffersen, 1980: 137; Christoffersen, 1982: 94; Christoffersen, 1998: 362 (part.); Coelho dos Santos & Coelho, 2001: 78. [?] Salmoneus aff. ortmanni  – Hernández Aguilera et al., 1996: 35.

[?] Salmoneus  sp. – Coelho & Ramos, 1972: 151.

Material examined: Holotype: 1 non-ovig. specimen (male?), MNHN-Na 13680, Guadeloupe, estuary of Rivière Lézarde, dredge (“chalutage”) between estuary and canal, time: 15.40, coll. Rojas-Hostache, 13 Jun 1977. Paratypes: 1 ovig. female, MNHN-Na 2699, Guadeloupe, M 42.1, coll. and det. (as Salmoneus ortmanni  ) A. Carvacho, 27 Jan 1977; 1 non-ovigerous specimen (male?), MNHN-Na 2669, Guadeloupe, M 32.5, coll. and det. (as Salmoneus ortmanni  ) A. Carvacho, 27 Jan 1977 [dissected].

Description: Carapace glabrous ( Fig. 3View FIGURE 3 b, c). Rostrum longer than broad, reaching half length of second segment of antennular peduncle, with acute tip ( Fig. 3View FIGURE 3 a); lateral margins slightly concave proximally; ventral margin unarmed ( Fig. 3View FIGURE 3 b); rostral carina slight, not reaching beyond eyes posteriorly ( Fig. 3View FIGURE 3 a). Orbital spines acute, slightly mesially directed ( Fig. 3View FIGURE 3 a). Pterygostomial margin feebly protruding anteriorly, rounded ( Fig. 1View FIGURE 1 a, c). Eyes covered in dorsal view, visible in lateral view ( Fig. 3View FIGURE 3 a, b). Antennule with stylocerite falling short of distal margin of second segment of antennular peduncle, with acute tip; second segment as long as wide ( Fig. 3View FIGURE 3 a). Antenna with basicerite bearing subacute distoventral spine ( Fig. 3View FIGURE 3 b); scaphocerite broadly ovate, distolateral spine small, acute ( Fig. 3View FIGURE 3 a, b). Third maxilliped with rounded lateral plate; tip of ultimate segment with short apical and subapical spiniform setae. Chelipeds strongly asymmetrical in shape, unequal in size ( Fig. 3View FIGURE 3 d–h). Major cheliped ( Fig. 3View FIGURE 3 d–g) with unarmed ischium; merus somewhat inflated distally, ventrally flattened ( Fig. 3View FIGURE 3 e); carpus elongated, ventrally flattened to slightly depressed, distally with blunt lobes ( Fig. 3View FIGURE 3 d); chela excavated ventrally, flattened mesially ( Fig. 3View FIGURE 3 d, c); fingers about half as long as palm, cutting edges serrated, with about 13–14 small rounded teeth ( Fig. 3View FIGURE 3 f, g). Minor cheliped ( Fig. 3View FIGURE 3 h) with ischium shorter than merus, both unarmed; carpus subequal to merus; chela small, simple, with fingers subequal to palm. Second pereiopod ( Fig. 3View FIGURE 3 i) with ischium bearing small spiniform seta; carpus with five segments, first segment longer than sum of four other segments ( Fig. 3View FIGURE 3 j). Third pereiopod ( Fig. 3View FIGURE 3 k) with ischium bearing two small ventrolateral spiniform seta; merus about six times as long as wide; carpus unarmed; propodus with three slender ventral spiniform setae, including distal seta; dactylus simple, conical, very slender, about 3 / 4 length of propodus Fifth abdominal somite with acute posteroventral angle ( Fig. 3View FIGURE 3 l). Sixth abdominal somite without articulated plate, with acute posteroventral projection ( Fig. 3View FIGURE 3 l); preanal plate rounded. Second pleopod with appendix masculina subequal to appendix interna, furnished with slender spines on apex and along outer margin. Uropod with sinuous diaeresis and slender distolateral spiniform seta ( Fig. 3View FIGURE 3 m). Telson more than twice as long as wide proximally ( Fig. 3View FIGURE 3 m), tapering posteriorly, with two pairs of dorsal spiniform setae, inserted at about mid-length and 3 / 4 telson length, respectively ( Fig. 3View FIGURE 3 m); posterior margin with very shallow median notch and two pairs of spiniform setae at posterolateral angles, mesial setae distinctly longer than lateral setae ( Fig. 3View FIGURE 3 n). Gill/exopod formula typical for genus (see under S. ortmanni  ).

Colour: Unknown.

Size: Holotype: CL 4.1 mm, TL 13.1 mm; ovigerous female paratype: CL 4.9 mm, TL 14.6 mm, nonovigerous paratype: CL 4.3 mm, TL 13.4 mm.

Etymology: The new species is named after Professor Alberto Carvacho (associated with the Museo Nacional de Historia Natural, Santiago de Chile), who collected most of the type specimens and published several studies dealing with alpheid and other caridean shrimps, including an important taxonomic note on Salmoneus ( Carvacho, 1989)  .

Ecology: This species is probably confined to estuaries of brackish mangrove rivers and is able to tolerate low salinities ( Carvacho, 1979; Christoffersen, 1982). In Mar de Cananéia and Baía do Trapandé (São Paulo), it was collected at depths of 0.3–1.2 m. The ovigerous specimen from Paraná was dredged from the mud bottom at 22 m ( Christoffersen, 1982).

Type locality: Guadeloupe, French Antilles.

Distribution: Western Atlantic: French Antilles: Guadeloupe ( Carvacho, 1979, as S. ortmanni  ; present study); Brazil: São Paulo, Paraná, possibly also Pernambuco and Sergipe ( Coelho & Ramos, 1972, as Salmoneus  sp.; Christoffersen, 1982, 1998, as S. ortmanni  ). The species reported as “ S. aff. ortmanni  ” from southwestern Gulf of Mexico, from Veracruz to Yucatan ( Hernández Aguilera et al., 1996) may also refer to S. carvachoi  n. sp., as well as part of Chace’s (1972) material from the Caribbean.

Remarks: Salmoneus carvachoi  n. sp. differs from S. ortmanni  by the slightly concave lateral margins of the rostrum (vs. slightly convex in S. ortmanni  , cf. Fig. 1View FIGURE 1 b, 3 a); the more slender walking legs (P 3-5), with the P 3 merus being six times as long as wide (vs. four in S. ortmanni  ), and with a much more elongate dactylus (cf. Fig. 1View FIGURE 1 g, 3 k); the P 3 ischium armed with two spiniform setae (vs. one seta in S. ortmanni  , cf. Fig. 1View FIGURE 1 g, 3 k); the presence of a small spiniform seta on the P 2 ischium (absent in S. ortmanni  , cf. Fig. 1View FIGURE 1 f, 3 i); the longer telson, bearing a less pronounced median notch on the posterior margin (cf. Fig. 1View FIGURE 1 j, 3 n); the more slender merus and chela of the major cheliped (cf. Fig. 2View FIGURE 2 a–d, 3 d–f); and the slightly higher number of teeth on the fingers of the major chela (13–14 in S. carvachoi  , n. sp. vs. 10–12 in S. ortmanni  , cf. Fig. 2View FIGURE 2 e, 3 f). The Brazilian specimens of S. carvachoi  n. sp. ( Christoffersen, 1982, as S. ortmanni  ) are morphologically similar to those from the Caribbean.














Salmoneus carvachoi

Anker, Arthur 2007


Salmoneus ortmanni

Santos 2001: 78
Christoffersen 1998: 362
Hernandez 1996: 35
Christoffersen 1982: 94
Christoffersen 1980: 137
Carvacho 1979: 453