Trachysalambria brevisuturae ( Burkenroad, 1934a )

Chan, Tin-Yam, Cleva, Régis & Chu, Ka Hou, 2016, On the genus Trachysalambria Burkenroad, 1934 (Crustacea, Decapoda, Penaeidae), with descriptions of three new species, Zootaxa 4150 (3), pp. 201-254 : 212-214

Trachysalambria brevisuturae ( Burkenroad, 1934a)

( Figs. 3 , 19A, B )

Trachypeneus (Trachysalambria) brevisuturae Burkenroad, 1934a: 55 , fig. 14 [type locality: Acajutla, El Salvador]; 1938: 79: text-figs. 20, 21.

Trachypenaeus brevisuturae .— Pèrez Farfante, 1971: 645, fig. 7A; Hendrickx, 1995: 499, unnumbered figs; 1996: 49, fig. 25. Trachysalambria brevisuturae .— Pèrez Farfante & Kensley, 1997: 149; De Grave & Fransen: 228.

Material examined. Mexico. Tehuantepec Gulf , Oaxaca, 10.07.1963, 3 females cl 14.5–18.0 mm ( MNHN IU- 2014-7021 ) . CICLO I, stn 130, San Ignacio Is., Sinaloa, 13 m, 0 6.07.1984, 2 females cl both 13.5 mm ( UNAM 2573 ) . CEEMEX P4: stn 19, San Mateo del Mar , Oaxaca, 31.03.1991, 31– 34 m, 2 females cl 18.3 and 20.0 mm ( UNAM 4837 ) ; stn 37, Puerto Madero , Chiapas, 23 m, 0 1.04.1991, 1 male cl 11.5 mm ( UNAM 4836 ) .

Panama. Pacific coast, Las Perlas Archipelago, Urraca cruise, dredge, 50–100 m, 10.2007: stn 2, 2 males cl 4.9 and 6.2 mm, 1 female cl 7.7 mm ( NTOU M01921 ) ; stn 3, 1 male cl 7.6 mm, 2 females cl 6.7 and 7.6 mm (NTOU M01922 ); stn 4, 1 male cl 4.8 mm (NTOU M01923 ); stn 5, 2 females cl 8.2 and 8.4 mm (NTOU M01924 ); stn 6, 1 males cl 7.9 mm (NTOU M01925 ); stn 7, 1 male cl 7.7 mm (NTOU M01926 ); stn 8, 2 males cl 5.8 and 7.1 mm, 1 female cl 6.0 mm (NTOU M01927 ); stn 9, 1 female cl 9.4 mm (NTOU M01928 ); stn 10, 10 males cl 6.1–7.3 mm, 3 females cl 6.7–7.3 mm (NTOU M01929 ); stn 11, 4 males cl 6.1–7.6 mm, 3 females cl 7.0– 9.9 mm (NTOU M01930 ); stn 14, 2 males cl 5.5 and 8.5 mm (NTOU M01931 ); stn 16, 3 males cl 6.9–8.3 mm, 4 females cl 5.6– 10.5 mm (NTOU M01932 ); no station data, 3 males cl 5.1–6.5 mm, 1 female cl 7.3 mm (NTOU M01933 ).

Description. Carapace slightly pubescent (mainly at anterior and dorsal parts) while abdomen almost naked. Rostrum with 7–9 (excluding epigastric tooth) teeth along entire dorsal border; slightly curved upwards in large females, with ventral border more or less convex, tip not recurved downwards, tips of rostral teeth aligned in a concave configuration; in males and small females rostrum straight and with ventral border concave, tip not recurved downwards, tips of rostral teeth aligned in a convex configuration; more or less extending to middle of second segment of antennular peduncle (generally longer in females); postrostral carina only extending to about middle of carapace. Pereiopods I to III with well-developed epipods. Pereiopod I sometimes bearing small ischial spine. Pereiopod IV in females with coxa not particularly expanded medially. Pereiopod V more or less extending to middle of scaphocerite, sometimes even reaching tip of scaphocerite in small individuals. Abdomen only with low dorsal carinae on somites IV to VI; not ridged in somites II and III; ridges on somites IV and V posteriorly incised and not terminating in spines. Telson with blunt dorsolateral carinae, bearing 4 pairs of lateral movable spines. Male petasma with lateral margins of stem distinctly converging distally; distolateral lobes with ventral margins straight or concave, tips of dorsal and ventral flaps in different directions, forming fork. Female thelycum with anterior plate somewhat triangular but with anterior part sometimes truncate, surface generally sunken or flattened; anterior margin of posterior plate somewhat straight, without median notch but instead with middle part often anteriorly protruding.

Coloration. Described as generally whitish to pinkish and with reddish or orange transverse spots on the abdomen by Hendrickx (1995). Color photographs of some penaeids collected from the Urraca cruise off Las Perlas Archipelago in the Pacific side of Panama probably belong to the present species. Unfortunately, however, we have been unable to retrace the Urraca cruise material examined due to insufficient information on the photographs. These photographs ( Fig. 19A, B ) showed that the shrimp is generally semi-transparent, scattered with white spots all over the body and bearing numerous minute reddish brown dots arranged somewhat in transverse rows particularly on the abdomen. Eyes dark grey. Antennal flagella reddish brown. Pereiopods ventrally reddish brown and dorsally whitish. Uropods with margins reddish and bearing some white spots on inner margins.

Distribution. Eastern Pacific from tip of Baja California to northern Peru; at depths of 4– 100 m.

Remarks. Trachysalambria brevisuturae is the only species of the genus not occurring in the Indo-West Pacific. This eastern Pacific species also differs from the other members of the genus in many aspects, including the shape of the genitalia and probably coloration. The body of T. brevisuturae is almost naked, with the abdominal dorsal carinae very low, and notably absent on the abdominal somites II and III. The other species of Trachysalambria have the body distinctly pubscent and always bearing dorsal carinae on the abdominal somites II and III, with only that of somite II being indistinct in one species (i.e., T. albicoma , which also has the abdomen less pubescent). The petasma has the distolateral lobe bifurcate in T. brevisuturae ( Fig. 3 E–G) but pointed in all other species of the genus. The thelycum has the middle of the anterior margin of the posterior plate often protruding forwards in T. brevisuturae ( Fig. 3 H) but not in the other species of Trachysalambria . Moreover, only T. brevisuturae has a rudimentary anteroventral arthrobanch on pereiopod IV (see Burkenroad 1934a; Pèrez Farfante & Kensley 1997). Molecular analysis also shows that T. brevisuturae is genetically quite different from the other members of the genus ( Fig. 21).

Figures

FIGURE 3. Trachysalambria brevisuturae (Burkenroad, 1934 a): A – C, H, female cl 18.0 mm, Tehuantepec Gulf, Mexico (MNHN IU- 2014 - 7021); D – G, male cl 11.5 mm, Puerto Madero, Mexico (UNAM 4836). A, cephalothorax, lateral view; B, carapace, dorsal view; C, dorsal part of abdominal somites I to VI, lateral view; D, rostrum, lateral view; E – G, petasma, ventral, dorsal and upper views, respectively; H, thelycum, ventral view.

FIGURE 19. A, B,? Trachysalambria brevisuturae (Burkenroad, 1934 a), Panama, Pacific coast, Urraca cruise, specimens details unknown, dorsal and lateral views, respectively (photographed by A. Anker); C, T. dentata sp. nov., the Philippines, AURORA, stn CP 2747, female cl 19.1 mm (NTOU M 01983); D, T. parvispina sp. nov., Vanuatu, SANTO, stn AT 42, female cl 21.2 mm (MNHN IU- 2014 - 6941); E, T. palaestinensis (Steinitz, 1932), Israel, Mediterranean coast, specimens details unknown (photographed by B. S. Galil); F, T. nansei Sakaji & Hayashi, 2003, Dasi fishing port, Yilan County, Taiwan, female cl 20.4 mm (NTOU M 01995).