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

publication ID

https://doi.org/ 10.5281/zenodo.179791

DOI

https://doi.org/10.5281/zenodo.3504385

persistent identifier

https://treatment.plazi.org/id/7F0587F6-FFFB-8026-D686-7778C97B2838

treatment provided by

Plazi

scientific name

Salmoneus carvachoi
status

sp. nov.

Salmoneus carvachoi View in CoL n. sp.

Fig. 3 View FIGURE 3

Salmoneus ortmanni View in CoL (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 View in CoL – Hernández Aguilera et al., 1996: 35.

[?] Salmoneus View in CoL 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. 3 View FIGURE 3 b, c). Rostrum longer than broad, reaching half length of second segment of antennular peduncle, with acute tip ( Fig. 3 View FIGURE 3 a); lateral margins slightly concave proximally; ventral margin unarmed ( Fig. 3 View FIGURE 3 b); rostral carina slight, not reaching beyond eyes posteriorly ( Fig. 3 View FIGURE 3 a). Orbital spines acute, slightly mesially directed ( Fig. 3 View FIGURE 3 a). Pterygostomial margin feebly protruding anteriorly, rounded ( Fig. 1 View FIGURE 1 a, c). Eyes covered in dorsal view, visible in lateral view ( Fig. 3 View 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. 3 View FIGURE 3 a). Antenna with basicerite bearing subacute distoventral spine ( Fig. 3 View FIGURE 3 b); scaphocerite broadly ovate, distolateral spine small, acute ( Fig. 3 View 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. 3 View FIGURE 3 d–h). Major cheliped ( Fig. 3 View FIGURE 3 d–g) with unarmed ischium; merus somewhat inflated distally, ventrally flattened ( Fig. 3 View FIGURE 3 e); carpus elongated, ventrally flattened to slightly depressed, distally with blunt lobes ( Fig. 3 View FIGURE 3 d); chela excavated ventrally, flattened mesially ( Fig. 3 View FIGURE 3 d, c); fingers about half as long as palm, cutting edges serrated, with about 13–14 small rounded teeth ( Fig. 3 View FIGURE 3 f, g). Minor cheliped ( Fig. 3 View 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. 3 View FIGURE 3 i) with ischium bearing small spiniform seta; carpus with five segments, first segment longer than sum of four other segments ( Fig. 3 View FIGURE 3 j). Third pereiopod ( Fig. 3 View 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. 3 View FIGURE 3 l). Sixth abdominal somite without articulated plate, with acute posteroventral projection ( Fig. 3 View 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. 3 View FIGURE 3 m). Telson more than twice as long as wide proximally ( Fig. 3 View FIGURE 3 m), tapering posteriorly, with two pairs of dorsal spiniform setae, inserted at about mid-length and 3/4 telson length, respectively ( Fig. 3 View 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. 3 View 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. 1 View FIGURE 1 b, 3a); the more slender walking legs (P3-5), with the P3 merus being six times as long as wide (vs. four in S. ortmanni ), and with a much more elongate dactylus (cf. Fig. 1 View FIGURE 1 g, 3k); the P3 ischium armed with two spiniform setae (vs. one seta in S. ortmanni , cf. Fig. 1 View FIGURE 1 g, 3k); the presence of a small spiniform seta on the P2 ischium (absent in S. ortmanni , cf. Fig. 1 View FIGURE 1 f, 3i); the longer telson, bearing a less pronounced median notch on the posterior margin (cf. Fig. 1 View FIGURE 1 j, 3n); the more slender merus and chela of the major cheliped (cf. Fig. 2 View FIGURE 2 a–d, 3d–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. 2 View FIGURE 2 e, 3f). The Brazilian specimens of S. carvachoi n. sp. ( Christoffersen, 1982, as S. ortmanni ) are morphologically similar to those from the Caribbean.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

InfraOrder

Caridea

Family

Alpheidae

Genus

Salmoneus

Loc

Salmoneus carvachoi

Anker, Arthur 2007
2007
Loc

Salmoneus ortmanni

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