Quollastria subtilis

Oratosquilla subtilis

Squilla gonypetes Kemp, 1911:96 [part]; 1913:54 [part].—Kemp and Chopra, 1921:300 [part].

Squilla oratoria var. perpensa.—Hansen, 1926:11 [part; not Squilla oratoria var. perpensa Kemp, 1911].

MATERIAL.—San Andreas Island, Philippine Islands; 13°38'N, 121°58'E; 50 fms (91.5 m); soft grey mud; Albatross sta 5220; 24 Apr 1908; paratype: 1 , TL 52 mm (USNM 77990). Buton Strait, off Tikola Peninsula, S Celebes Island, Indonesia; 04°31′40″S, 122°49′42″E; 37 fms (68 m); green mud; Albatross sta 5642; 14 Dec 1909; paratype: 1 , TL 40 mm (USNM 77989). Madura Strait; 07°25'S, 113°16'E; 56 m; grey mud with some Radiolariae; Siboga sta 2; 8 Mar 1900; paratype: 1 , TL 30 mm (ZMA). Off Kabusa Island [Kabosa Island, 12°49'N, 97°53'E], Lower Burma; 25–35 fms (46–64 m); Investigator, leg; paratypes: 1 , TL 39 mm; 1 , TL 43 mm (ZSI, ex C320/1). Off Vizagapatam [Visakhapatnam, 07°42'N, 83°18'E] coast, Madras, India; 20 fms (37 m); Investigator, leg.; holotype: 1 , TL 47 mm (ZSI 7536/10).

DESCRIPTION.—Size small to moderate, total length of adults to 52 mm. Body appearing smooth, minutely pitted under magnification.

Eye (Figure 19b) small, cornea bilobed, set obliquely on stalk. Eyes not extending to end of first segment of antennular peduncle. Corneal indices 412–442.

Antennular peduncle longer than carapace. Dorsal processes of antennular somite produced into blunt lobes directed anterolaterally.

Rostral plate (Figure 19a) with shape variable, either broader than long or slightly longer than broad, lateral margins converging on rounded apex. Median carina absent.

Anterior width of carapace half or slightly less than half median length. Anterolateral spines (Figure 19a) strong, extending to or almost to base of rostral plate. Median carina interrupted at base of bifurcation, branches of bifurcation well developed in some specimens, scarcely visible in others. Intermediate carinae not sloping toward laterals, not extending to anterior margin.

Dactylus of claw with 5 teeth, outer margin evenly curved, with obtuse projection basally. Dorsal ridge of carpus (Figure 19c) undivided. Inferodistal angle on outer face of merus unarmed.

Exposed thoracic somites (Figure 19d) each with unarmed submedian and intermediate carinae, intermediates of fifth somite irregular, short. Lateral process of fifth somite bilobed, anterior lobe a sharp, anteriorly directed spine, posterior lobe smaller, broad, obtusely subtriangular, rounded, or subquadrate, directed laterally. Lateral process of sixth somite strongly bilobed, anterior lobe large, subrectangular, posterior lobe pentagonal or triangular, obtusely rounded. Lateral process of seventh somite distinctly bilobed, anterior lobe smaller than that of sixth somite, subtriangular, posterior lobe much larger, subtriangular, apex acute but rounded, unarmed.

Submedian carinae subparallel on fifth abdominal somite. Abdominal carinae spined as follows: submedian 5–6, intermediate 4–6, lateral (3)4–6, marginal (2–3)4–5.

Telson flattened, slender, slightly longer than broad. Prelateral lobe subequal in length to margin of lateral tooth. Denticles (Figure 19e) subtriangular or rounded, usually unarmed, 3–5, 6–7, 1, outer submedian and outer intermediate larger than remainder, inner submedians occasionally spiniform. Ventral surface with short postanal keel.

Uropod (Figure 19f, g) slender, proximal segment longer than distal, with 9–10 movable spines on outer margin, distalmost not extending to midlength of distal segment. Lobe on outer margin of inner spine of basal prolongation large, projecting, broader than adjacent spine, margin concave, apex angled or rounded.

COLOR.—Carinae and grooves of carapace lined with dark pigment. Posterior margins and submedian carinae of thoracic somites lined with dark pigment, sixth to eighth somites each with dark patch lateral to intermediate carinae. Second and fifth abdominal somites each with dark dorsal patch, that on second in middle of somite; that on fifth on posterior margin, often subdivided into 2 triangular patches. Posterior margin of each abdominal somite and submedian and intermediate carinae lined with dark pigment, area between submedian and intermediate carinae with dark longitudinal line. Sixth abdominal somite with triangular black spot below lateral carinae. Median carina of telson with 2 dark spots, anterior rectangular, posterior triangular, outer edges connected by faint dark line. Surface pits and carinae of marginal teeth of telson dark. Distal half of proximal segment and inner 2/3 of distal segment of uropod dark (most of distal segment in some specimens). Basal prolongation of uropod with dark line at about midlength of inner ventral surface.

MEASUREMENTS.—Males, TL 30–52 mm; females, TL 43–47 mm. Other measurements of male paratype, TL 39 mm: CL 8.8, anterior width 4.2; cornea width 2.1; antennular peduncle length 9.9; rostral plate length 1.5, width 1.4; telson length 7.2, width 7.0.

DISTRIBUTION.—Known from four localities in the Philippine Islands, Indonesia, off Burma, and off Madras, India, in depths between 37 and 91.5 m.

細長東方蝦蛄（学名：Quollastria subtilis）为蝦蛄科東方蝦蛄屬下的一个种。