Latreutes fucorum ( Fabricius, 1798 )

Cardoso, Irene, 2006, Caridea (Crustacea, Decapoda) collected on the Brazilian (13 / 22 S) continental shelf and slope, Zootaxa 1364, pp. 1-44 : 16-20

Latreutes fucorum ( Fabricius, 1798)

(Figs. 11–14)

Palaemon fucorum Fabricius, 1798: 404 .

Latreutes fucorum — Sivertsen & Holthuis, 1956: 31; Williams, 1965: 78; 1984: 119; Chace, 1972:121.

Material examined: 14o38´30”S, 38o55´00”W, 20m, 3 ovigerous female (1.9, 2.3, 2.9mm), MNRJ 19463.

Diagnosis: Carapace with one postrostral cuspidate seta; anterolateral angle with lobe formed by 4–9 small acute teeth; postorbital and antennal spine present. Stylocerite broad narrowing to tip, anterolateral tooth reaching second antenular peduncle article. Scaphocerite with distal tooth overreaching blade. Telson with two pairs of dorsolateral cuspidate setae and one end piece delimited by 3 pairs of distal cuspidate setae.

Description: Carapace with one postrostral cuspidate seta; anterolateral angle with lobe formed by 4–9 small acute teeth, with postorbital and antennal spine; hepatic and branchiostegal spines absent (Fig. 11A). Stylocerite broad narrowing to tip, anterolateral tooth reaching second antenular peduncle article (Fig. 11B). Scaphocerite with distal tooth slender, overreaching end of blade (Fig. 11C). Mandible, incisor process absent; molar process formed by series of crests with tiny teeth ( Fig. 12 A). Maxilla 1, distal endite rounded, with one long papposerrulate seta on upper margin, 2 simple seta, one serrate seta, 4 cuspidate setae, and many serrulate cuspidate setae on inner margin, many plumose setae on lower margin; basal endite triangular, with 4–5 simple setae on lateral margins and 3 serrulate cupidate setae on inner margin; palp with small plumose seta on tip ( Fig. 12 B). Maxilla 2, scaphognathite with plumose setae on all margins; endopod twice and a half scaphognathite length; endite with three lobes, and pappose setae on inner margin ( Fig. 12 C). Maxilliped 1, exopodal lobe slender, with plumose setae on outer margin; exopod well developed, almost twice the exopodal lobe length, with plumose setae on apex; endopod one third of exopod length; endite with three lobes, distal and basal with plumose setae and median with simple setae on inner margin ( Fig. 12 D). Maxilliped 3, ischiomerus with a distal vertical series of 6 teeth; carpus with a distal horizontal series of 4 teeth; propodal-dactylar pectinate setae and 6 cuspidate setae on inner margin and 2 cuspidate setae on tip ( Fig. 12 E). Pereopod 1 stronger and shorter than second; merus with 3 basal plumose setae; carpus short, broadened; propodus rounded, with 2 cuspidate setae on tip; dactylus rounded, with 4 cuspidate setae on tip ( Fig. 13 A). Pereopod 2 elongate, carpus subdivided in 3 articles, the first one with a distal cuspidate setae; propodus with 2 cuspidate setae on tip; dactylar tip with 3 cuspidate setae ( Fig. 13 B). Pereopod 3 slender and elongate, longer than the others, ischium and merus with one cuspidate seta each; propodus with 6 pairs of cuspidate setae; dactylus claw-like, with 5 small cupidate setae on inner margin and 2 cuspidate setae on tip ( Fig. 13 C). Pereopod 4 slender and elongate, propodus with one distal cupidate seta, dactylus with 4 small cuspidate setae on inner margin and 2 cuspidate setae on tip ( Fig. 13 D). Pereopod 5 slender and elongate, shorter than the others, propodus with one distal cupidate seta, and 2 cuspidate setae near dactylar articulation; dactylus with 4 small cuspidate setae on inner margin and one cuspidate seta on tip ( Fig. 13 E). Female endopod of pleopod 1 slender, with plumose setae on all margins ( Fig. 14 A). Female endopod of pleopod 2, appendix interna one-third of endopod length, with many hook setae on tip ( Fig. 14 B). Telson with 2 pairs of dorsolateral cuspidate setae and an acute end piece delimited by 3 pairs of setae, outer pair smallest ( Fig. 14 C). Endopod of uropod without diaresis; lateral margin ending in sharp triangular projection; with a posterolateral tooth that not overreaches exopod ( Fig. 14 C).

Distribution: Western Atlantic: north between latitudes 10o e 50o N, Tortola, Guana, Barbuda, Antigua, Brazil (Pernambuco, Alagoas and Bahia). Eastern Atlantic: Canary Islands, Azores and Cabo Verde.

Remarks: According to Williams (1984) only two species of genus Latreutes are recorded in the Eastern coast of United States: L. parvulus (Stimpson, 1960) and L. fucorum . These two species, are the only of the genus Latreutes recorded from Brazilian waters. Latreutes fucorum differs from L. parvulus in having the carapace and rostrum unarmed dorsally.

The specimens examined herein have the distal part of rostrum broked, but they have the dorsal margin of carapace unarmed, and the shape of rostrum base is identical to L. fucorum . Other features agree with Williams’ (1984) description and confirm the identification of this material as L. fucorum : presence of one postrostral cuspidate seta; anterolateral angle with 4–9 small acute teeth; scaphocerite elongate with a distal tooth overreaching blade and pereopod 3 with 6 pairs of cuspidate setae on propod. A single difference between the material examined and Williams’ (1984) material was observed: the dorsolateral cuspidate setae are more lateral in Brazilian material.

Figures

FIGURE 12. Latreutes fucorum (Fabricius, 1798), female, 2.9 mm, MNRJ 19463; A. left mandible; B. left maxilla 1; C. left maxilla 2; D. left maxilliped 1; E. left maxilliped 3 (maxilliped 2 lost).

FIGURE 13. Latreutes fucorum (Fabricius, 1798), female, 2.9 mm, MNRJ 19463; A. right pereopod 1, lateral view; B. right pereopod 2, lateral view; C. right pereopod 3, lateral view; D. right pereopod 4, lateral view; E. right pereopod 5, lateral view.

FIGURE 14. Latreutes fucorum (Fabricius, 1798), female, 2.9 mm, MNRJ 19463; A. endopod of right first pleopod, lateral view; B appendix interna, endopod of right second pleopod; C. telson and uropods, dorsal view.