Glyphocrangon denticulata, Han, Qingxi & Li, Xinzheng, 2014

Han, Qingxi & Li, Xinzheng, 2014, Two new species of Glyphocrangon (Decapoda: Caridea: Glyphocrangonidae) from the East China Sea and the Philippines, Zootaxa 3852 (4), pp. 438-444 : 441-443

Glyphocrangon denticulata sp. nov.

( Figs. 3–5 )

Glyphocrangon pugnax — Chace, 1984: 19 (in part).

Glyphocrangon pugnax — Komai & Chan, 2008: 52, fig. 13D1, D2.

Material examined. The Philippines. Holotype, male (cl 13.1 mm), paratypes, 1 male (cl 11.4 mm), 1 ovig. female (cl 21.1 mm), stn. CP2390, 9°27.4′N, 123°43.1′E, 613–627 m, rock and sand, 30 May 2005.

Description. Body slender. Integument of carapace and abdomen naked, without short setae.

Rostrum ( Fig. 3 A, B) almost as long as postorbital carapace length, dorsal surface with long middorsal ridge and two lateral ridges; lateral margin with 2 pairs of teeth, anterior pair anterior to cornea. Carapace ( Fig. 3 A, B) with first anterior carina composed of 5–6 acute tubercles, first posterior carina composed of 4–5 low and blunt tubercles. Second anterior carina composed of 3 acute teeth, anteriormost tooth largest and most acute. Second posterior carina usually composed of some continuous and low tubercles. Third anterior carina continuous with antennal spine, entire, posterior part represented by 2–3 small and inconspicuous tubercles. Third posterior carina entire, terminating anteriorly in blunt angle, and paralleled with dorsal surface of carapace. Fourth anterior carina high and entire, terminating anteriorly in acute spine. Branchial region bearing some inconspicuous tubercles, arranged at almost 1 row. Two antennal spines smooth, without small spine and almost as long as branchiostegal spines.

All abdominal somites ( Fig. 3 A, B) bearing middorsal carinae. Middorsal carinae of second to sixth abdominal somites distinctly notched. First abdominal somite with groove at posterior quarter and distinct middorsal carina, terminating anterior with large and acute spine, same as lateral dorsal carina. Intercarinal space between middorsl carina and submedian carina bearing some small and low tubercles. Middorsal carina of second abdominal somite notched by transverse groove, pleuron armed with 2 ventral spines. Pleuron of third abdominal somite armed with 2 ventral spines, posterior spine larger and more acute. Middorsal ridge of fourth abdominal somite notched at anterior 1/3 by transverse groove, pleuron armed with 2 ventral spines, anterior spine more acute. Pleuron of fifth abdominal somite armed with 2 ventral spines, posterior spine about 2 times longer than anterior one. Middorsal ridge of sixth abdominal somite notched at anterior 1/3 by transverse groove, lateral carina notched at posterior 1/5 to 1/4. Telson about 0.7 times as long as carapace length, bearing blunt protuberance at about anterior 1/5.

Eyes ( Fig. 3 A, B) moderately large, maximum diameter about 0.25 times of carapace length, dark brown in preservative.

Antennal scaphocerite ( Figs. 3 A, B, 4A) about 0.45 times of carapace length, bearing lateral tooth at about basal 1/3.

First pereopod ( Fig. 4 B) with numerous tufts of short setae on lateral surface of palm. Second pereopod ( Fig. 4 C) unequal with right longer than left; left carpus composed of 19 articles and right composed of 30 articles. The last 3 pair of pereopods much stronger than the second pereopod. Third pereopod ( Fig. 4 E) only slightly overreaching distal margin of scaphocerite, propodus without distal tuft of setae. Fourth and fifth pereopods ( Fig. 4 F, G, H) with dactylus simple and acuminate. Second pleopod ( Fig. 4 I) with endopod almost as long as appendix masculine in males.

Coloration in life. Body orange dorsally, whitish translucent laterally. Rostrum with anterior 1/3 cardinal red. Carina and tubercles on carapace and abdomen palm yellow. Most pereopod whitish. Eggs pale blue. See Fig. 5 .

Distribution. So far only known from the type locality in the Philippines, at depths of 613–627 meters.

Etymology. Derived from the Latin denticulatus, means bearing small tooth, in referring to the lateral tooth on the antennal scaphocerite.

Remarks. The new species closely resembles Glyphocrangon pugnax De Man, 1918 with the entire anterior third carina on the carapace. It differs from G. pugnax by: 1) the antennal scaphocerite bears a distinct lateral tooth at about basal 1/3, whereas in G. pugnax , the antennal scaphocerite has no trace of lateral tooth ( De Man, 1918; 1920; Komai, 2004); 2) the rostrum is about as long as (male) or 0.81 times as long as (female) the carapace length, whereas in G. pugnax , the rostrum is about 0.68–0.77 times as long as the carapace length; 3) the carinae and intercarinae are less unconspicuous on the carapace, the posterior dorsolateral region bears only 3–11 small and low tubercles arranged in 1 row, and the upper part of the branchial region bears 7–10 tubercles arrangd in 1 row, whereas in G. pugnax , the posterior dorsolateral region bears 20–30 small pointed tubercles arranged in 3 rows, and the branchial region with the upper part bears 30–40 tubercles arranged in 3 irregular rows; 4) the posterior spine on the pleuron of the fifth abdominal somite is about 2 times longer than the anterior one, whereas in G. pugnax , the 2 spines are of equal in size; 5) the carapace is orange dorsally, whitish translucent laterally, whereas in G. pugnax , it is salmon pink throughout (Jones & Morgan, 1994; Komai, 2004), Komai & Chan (2008) explained that this difference in colouration may be due to the perservation condition of the photographed specimen or the printing condition of the photograph.

Figures

FIGURE 3. Glyphocrangon denticulata sp. nov., holotype, male (cl 13.1 mm), the Philippines, body. A, lateral view; B, dorsal view. Scale bar = 1 mm.

FIGURE 4. Glyphocrangon denticulata sp. nov., holotype, male (cl 13.1 mm), the Philippines. A, left scaphocerite, setae omitted; B, left first pereopod, lateral view; C, left second pereopod, lateral view; D, palm of second pereopod, lateral view; E, left third pereopod, lateral view; F, left fourth pereopod, lateral view; G, dactylus of fourth pereopod, lateral view; H, left fifth pereopod, lateral view; I, left second pleopod, dorsal view. Scale bars = 1 mm (A – C, E – I); 0.2 mm (D).

FIGURE 5. Glyphocrangon denticulata sp. nov., paratype, ovigerous female (cl 21.1 mm), the Philippines, colour photo. Photographed by Dr. Tin-Yam Chan.