【摘要】 <正> 扁蟹科的种类甚少。我们在南海调查中,从拖网采获数量较丰富的一种扁蟹,共123号标本,其中♂102,♀309(170个抱卵),生活于水深34—202米的泥质沙或软泥底。这些标本经鉴定与已知种有显著不同,故确定为新种,现描述如下。更多还原

【Abstract】 Palicus trituberculatus sp. nov. (Pis. Ⅰ-Ⅱ)Holotype (?) (S209B-14), 21°N, 114°30’ E, depth 82 m, bottom mud, 1960, Ⅳ. 8.Allotype (?) (S219B-23), 21°30’ N, 115°30’ E, depth 115 m, bottom muddy sand. 1960, Ⅳ. 13.Paratype (?),(?) (S143B-13), 21°N, 114°30’ E, depth 83 m, bottom muddy sand, 1959, Ⅶ. 10; 4 (?), 2 (?), (S221B-26), 22°N, 115°30’ E, depth 78 m. bottom mud, 1960, Ⅳ. 4.Type specimens are deposited in the Institute of Oceanology, Academia Sinica, Qingdao, China.Carapace broader than long. Dorsal surface uneven and covered with granular tubercles of various size; regions well defined. Front protruded and divided into two lobes by a Ⅴ-shaped, shallow notch. Supraorbital border with two small notches. Outer orbital tooth prominant. Inner and outer infraorbital teeth covered with sharp granules, each of them is divided into 2 teeth, the former by a Ⅴ-shaped incision, the latter by a deep narrow incision. Lateral border arched, with two teeth near the middle; posterior border broad and straight.Exopod of third maxilliped slender, surface covered with fine granules, with a rod-like tubercle on inner distal half. Ishium of endopod broad, with a longitudinal groove, inner distal angle strongly protruded and triangular in shape. Merus small. Cheliped small, symmetrical. Surface and external border of merus and carpus covered with sharp granules which are absent from inner border. Palm twice as broad as long, its outer border with fine denticles. Finger longer than palm, inner border with 4 to 5 blunt teeth and extremity of the fingers are crossed.The anterior three pairs of ambulatory legs resemble in shape, the first one the shortest, and the second one the longest. Merus stout, its borders and surface armed with sharp teeth and granules, its tip forming a sharp spine. Carpus slender, with a longitudinal granulated ridge on the middorsal surface. Finger as long as propodus, without hairs on their anterior borders, but with long setae on their posterior borders. The last pair of legs are very small and dorsal in position.Abdomen of both sexes with third to fifth segments fused: bluntly triangular in male, with three small tubercles on its basal half: one of which is on middle of anterior border, another two are situated side by side posteriorly. Sixth segment is trapezoid, narrowed distally. Telson buntly triangular. First male pleopod stout, with distal 1/3 twisted, with 1 large and 2 small tubercles, its tip is blade-like. Abdomen of female subcircular, the basal half of 3-5 segments with two transverse denticulated ridges. Telson broad at base, with the extremity round.The new species closely resembles Palicus vietnamensis Zarenkov, 1968 and Palicus unidentata Zarenkov, 1968, but it may be distinguished from the latter two species by the lateral border of its carapace, being armed with two blunt teeth, by the male abdomen being armed with three small tubercles and by its infraorbital border and the first male pleopod are also different in shape.更多还原