Trachysalambria parvispina Chan, Cleva & Chu, 2016, sp. nov.
Creators: name: Chan, Tin-Yam
name: Cleva, Régis
name: Chu, Ka Hou
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Penaeidae
Trachysalambria
Trachysalambria parvispina

description: Trachysalambria parvispina sp. nov.
(Figs. 5, 6, 19 D)
Type material. Holotype: Indonesia, ANABAMS, stn EA-TT-04, 2°53.03’N, 105°50.55’E, 31– 24 m, 13.03.2002, female cl 14.6 mm (MZB).
Paratypes: Indonesia, ANABAMS: stn EA-TT-01, 2°52.80’N, 105°50.43’E, 30–32 m, 12.03.2002, 1 male cl 9.0 mm, 3 females cl 10.7–15.0 mm (MNHN IU- 2014-6933); stn EA-TT-04, 2°53.03’N, 105°50.55’E, 31 – 24 m, 13.03.2002, 7 males cl 10.0– 11.5 mm, 7 females cl 10.8–13.8 mm (MNHN IU-2014-6928), 1 male cl 10.5 mm (MNHN IU-2014-6925), 1 female cl 11.5 mm (MNHN IU-2014-6924), 1 female cl 14.0 mm (MNHN-IU-2014- 12732), 1 female cl 14.6 mm (MNHN IU-2014-6930), 1 female cl 13.5 mm (ZRC).
Other material examined. Philippines. MUSORSTOM III, stn CP 121, 12°08'N, 121°18'E, 73–84 m, 0 3.06.1985, 1 male cl 14.0 mm (MNHN IU- 2014-7138), 1 male cl 10.0 mm (MNHN IU-2014-6938), 1 female cl 15.4 mm (MNHN IU- 2014-6937). AURORA, stn CP 2654, 16°04.7'N, 121°57.5'E, 98–107 m, 20.05.2007, 1 male cl 12.4 mm (NTOU M01970).
Vanuatu. SANTO: stn AT 0 2, 15°32.5’S, 167° 16.1E, 160–175 m, 14.09.2006, 1 male cl 11.2 mm (MNHN IU- 2014-6940); stn AT 13, 15°27.8’S, 167°15.7E, 99–153 m, 19.09.2006, 1 male cl 11.3 mm (MNHN IU-2014-6939); stn AT 42, 15°37.5’S, 167°02.3E, 112–148 m, 28.09.2006, 1 female cl 21.2 mm (MNHN IU-2014-6941).
Fiji. MUSORSTOM X, stn CP 1358, 17°48.5’S, 178°46.7’E, 80–120 m, 13.08.1998, 2 males cl 7.5 and 10.0 mm, 1 female cl 6.3 mm (MNHN IU- 2014-6946). SUVA 2, stn CP 65, 17°47.9’S, 177°12.8’E, 32 m, 21.10.1998, 1 female cl 12.5 mm (MNHN IU-2014-6943). SUVA 4: stn DW 16, 18°25.8’S, 178°07.0’E, 32–36 m, 24.09.1999, 1 male cl 8.5 mm (MNHN IU-2014-6944); stn CP 20, 18°16.4’S, 178°02.4’E, 50–51 m, 25.09.1999, 1 female cl 7.5 mm (MNHN IU-2014-6945).
Tonga. BORDAU 2, stn CP 1582, 18°41’S, 174°03’W, 79–82 m, 13.06.2000, 1 male cl 9.0 mm (MNHN IU- 2014-6942).
Wallis Is. MUSORSTOM VII, stn Lagonsud 2, 13°22’S, 176°11’W, 55– 52 m, 15.05.1992, 1 female cl 7.5 mm (MNHN IU- 2014-6947).
Seychelles. REVES 2, stn CH 15, 5°33,3'S, 56°45'E, 57 m, 0 4.09.1980, 1 female cl 23.0 mm (MNHN IU- 2014-6934), 1 female cl 23.0 mm (MNHN IU-2014-6935).
Madagascar. Pracel bank, trawl, 55 m, 0 6.1959, 1 female cl 19.5 mm (MNHN IU- 2014-6936).
Description. Entire body densely pubescent. Rostrum with 8–10 (usually 9, excluding epigastric tooth) teeth along entire dorsal border; more or less straight in females, with ventral border convex to more or less straight, tip straight or slightly recurved downwards, tips of rostral teeth aligned in a straight or slightly convex configuration; in males rostrum straight to slightly curving downwards, ventral border slightly concave, tip sometimes slightly recurved downwards, tips of rostral teeth more or less aligned in a convex configuration; reaching from base to near tip of second segment of antennular peduncle (generally longer in females and larger individuals); postrostral carina distinct and extending to near posterior carapace. Pereiopods I to III with well-developed epipods. Pereiopod I without ischial spine. Pereiopod IV with coxa not particularly expanded medially in females. Pereiopod V more or less extending to tip of scaphocerite. Abdomen with dorsal carinae distinct and elevated on somites II to VI; somite II with 1 short but distinct ridge; somite III only with distinct dorsal carina on posterior 2/3 of somite, anterior 1/3 of somite without dorsal carina (more often) or only with rudimentary dorsal carina; somites IV and V with dorsal carinae along entire somite and terminating posteriorly in small spines (posterior spine at somite IV occasionally rather minute). Telson with strong but blunt dorsolateral carinae, bearing 3 or 4 pairs of movable lateral spines. Male petasma with lateral margins of stem distinctly converging distally; distolateral lobes with ventral margins more or less straight, tips of dorsal and ventral flaps coinciding, forming sharp angle. Female thelycum with anterior plate semi-triangular, generally sunken or flattened; anterior margin of posterior plate distinctly concave and with a median notch.
Coloration. Body generally pinkish brown, darker dorsally and paler laterally. Anterior part of rostrum pale pink. Epigastric tooth pale pink. Eyes dark brown. Antennular flagella pale white with reddish brown tip. Pereiopods whitish with some reddish brown patches. Dorsal carinae on abdominal somites IV to VI pale white. Pleopods pinkish to reddish brown or pale yellowish, with lateral surfaces whitish. Tail fan with distal half reddish, telson with a subdistal white mark, uropods with lateral tips of exopods and mesial margins of endopods broadly whitish.
Distribution. Widely distributed in the Indo-West Pacific and known with certainty from the Philippines, Indonesia, Vanuatu, Fiji, Tonga, Wallis Islands, Seychelles and Madagascar; at depths of 24– 175 m.
Remarks. Trachysalambria parvispina sp. nov. is similar to T. dentata sp. nov. and T. malaiana in the dorsal carinae of the abdominal somites IV and V terminating posteriorly in spines (Fig. 5 E, F), readily separating these species from others in the genus. This new species differs from T. dentata sp. nov. in having only one instead of two dorsal ridges on abdominal somite II (Figs. 4 B, 5E, F), as well as some other characters discussed under the “Remarks” of the latter species. Moreover, the rostrum is often more crest like and broader in T. parvispina sp. nov. (Fig. 5 A, B, D) than in T. dentata sp. nov. (Fig. 4 A, C). Genetic data also supports T. parvispina sp. nov. and T. dentata sp. nov. being closely related yet distinct species (i.e., sequence divergences = 4.1% in 12S rRNA gene and = 3.1% in 16S rRNA gene; Tables 2, 3, Fig. 21). Other than bearing epipods on the pereiopods I and II (Fig.
6C), T. parvispina sp. nov. differs from T. malaiana in always having a straight or even crest-like rostrum (Figs. 1 A, C, 5A, B, D).
It is important to point out that the posterior spines on abdominal somites IV and V are sometimes rather minute in small specimens of this species, making them very similar to T. aspera. As discussed under the “Remarks” of T. aspera, the small Red Sea specimen from the “John Murray” expedition is somewhat intermediate in characteristics between T. aspera and T. parvispina sp. nov. The occurrence of T. parvispina sp. nov. in the northern Indian Ocean, including the Red Sea, will need to be confirmed. Similarly, whether previous records of “ T. curvirostris ” in the western Indian Ocean (e.g., Champion 1973; Kensley 1972; de Freitas 1987) actually include the present form will need to be determined. In the western Pacific this species seems to have a more “southern” distribution than T. dentata sp. nov. and has not been found either in Taiwan or Japan despite recent intensive surveys there. On the other hand, these two closely related species at least have overlapping ranges in the Philippines and Indonesia, and their coloration is very similar (also see “Coloration” and “Remarks” of T. aspera). Nevertheless, the white color of the rostrum and abdominal dorsal carinae is much more prominent in T. dentata sp. nov., thus making T. dentata sp. nov. more colorful in general appearance than T. parvispina sp. nov.
Etymology. The name “ parvispina ” refers to this new species bearing smaller (parvus = little) posterior spines on the dorsal carinae of the abdominal somites IV and V as compared to the other new species T. dentata sp. nov. also described in this work.
description: Published as part of Chan, Tin-Yam, Cleva, Régis & Chu, Ka Hou, 2016, On the genus Trachysalambria Burkenroad, 1934 (Crustacea, Decapoda, Penaeidae), with descriptions of three new species, pp. 201-254 in Zootaxa 4150 (3) on pages 217-221, DOI: 10.11646/zootaxa.4150.3.1, http://zenodo.org/record/264370