Planaja plana Ng &amp; Forges 2015, n. sp.
Creators: name: Ng, Peter K. L.
name: Forges, Bertrand Richer De
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Majidae
Planaja
Planaja plana

description: <i>Planaja plana</i> n. sp. (Figs. 2G, 34A, B, 35A–E, 38A, 40N, 42G, 46M, N, 51F, G, 52K, 54N, 56K) <b>Material examined.</b> Holotype: male (43.7 × 37.1 mm) (NMCR), Balicasag Island, Panglao, Bohol, Philippines, coll. fishermen with tangle nets, July 2003. Paratypes: <b>Philippines</b> – 3 males (42.9 × 35.0 mm, 38.3 × 30.1 mm, 33.3 × 26.9 mm), 2 ovigerous females (47.9 × 40.9 mm, 45.1 × 37.8 mm) (ZRC 2013.1319), same data as holotype. — 1 male (40.2 × 33.2 mm) (ZRC 2001.0435), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, December 2000. — 8 males (38.2 × 31.7 mm, 44.4 × 36.8 mm, 38.5 × 31.7 mm, 38.7 × 31.0 mm, 38.2 × 31.0 mm, 30.4 × 24.3 mm, 26.3 × 21.2 mm, 34.4 × 27.3 mm), 4 ovigerous females (44.7 × 37.2 mm, 42.4 × 34.5 mm, 36.1 × 29.7 mm, 44.5 × 38.6 mm) (ZRC 2001.0430), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, December 2000. — 1 male (39.3 × 30.3 mm) (ZRC 2001.0591), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, 28 November 2001. — 2 males (40.2 × 31.8 mm, 35.8 × 27.9 mm), 1 female (44.4 × 34.8 mm) (USNM), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, June 2002. — 1 juvenile male (ZRC 2013.1316), Balicasag Island, Panglao, Bohol, 200–300 m, coll. fishermen with tangle nets, June 2002. — 2 males (42.5 × 34.9 mm, 38.1 × 29.8 mm), 1 ovigerous female (48.8 × 41.4 mm), 1 female (45.3 × 37.8 mm) (ZRC 2013.1369), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, July 2003. — 2 males, 1 female (NSMT-Cr 22331), Balicasag Island, Panglao, Bohol, 200–300 m, coll. fishermen with tangle nets, February 2004. — 2 males (22.2 × 17.5 mm, 22.7 × 18.3 mm) (ZRC 2013.1325), Balicasag Island, Panglao, Bohol, 200–300 m, coll. fishermen with tangle nets, May 2004. — 1 male (42.1 × 35.1 mm), 2 ovigerous females (44.8 × 37.2 mm, 44.9 × 37.3 mm) (ZRC 2013.1368), Balicasag Island, Panglao, Bohol, station PN1, coll. P.K.L. Ng from fishermen with tangle nets, 29 May 2004. — 1 male (42.8 × 34.3 mm), 1 female (AM), station PN1, Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, January 2004. — 1 female (ZRC 2013.1320), Stn PN 1, Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, 3 January 2004. — 1 female (37.1 × 30.2 mm) (ZRC 2013.1321), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, February 2004. — 2 males (35.3 × 28.8 mm, 33.6 × 26.7 mm), 2 females (41.0 × 32.0 mm, 28.9 × 23.0 mm) (ZRC 2013.1326), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, March 2004. — 1 male (38.3 × 30.7 mm) (ZRC 2013.1370), Balicasag Island, Panglao, Bohol, coll. fishermen with tangle nets, 28 May 2004. — 2 males (41.0 × 34.0 mm, 45.4 × 36.5 mm) (ZRC 2012.1206), Balicasag, Panglao, Bohol, 200–300 m, coll. local fishermen with tangle nets, 29 May 2004. — 1 ovigerous female (45.2 × 36.9 mm) (ZRC 2012.1205), station DW 2402, Dipolog Bay, off Balicasag Island, Bohol Sea, 9°30.8’N 123°41.5’E, coll. PANGLAO 2005, 31 May 2005. Others: <b>Taiwan</b> – 1 female (46.6 × 40.9 mm) (ZRC 2001.0057), Nangfangao port, Su-Ao, Ilan County, northeastern Taiwan, coll. P.K.L. Ng, 5 November 2000. <b>Diagnosis.</b> Carapace pyriform; dorsal surface gently convex, covered by numerous rounded granules (Fig. 34A, B). Pseudorostral spines long, diverging (Fig. 38A). Supraorbital eave expanded, with long sharp antorbital tooth; intercalated spine triangular, sharp, shorter than others; postorbital tooth triangular, very long, touching base of long, curved hepatic spine; median row with 5, usually 6 short spines (Fig. 34A, B, 38A). Lateral margin with 6 or 7 short spines, regularly arranged; 1 short branchial spine and 1 submedian tubercle; 3 small spines on posterior carapace margin (Fig. 34A, B). Ambulatory legs short, setose (Figs. 34A, B, 56K). Basal antennal article distinctly granulated with 2 strong spines distally (Fig. 40N). Subhepatic area strongly granulated (Fig. 40N). Ischium of third maxilliped almost smooth, gently rugose or with scattered low granules (Fig. 46M, N). G1 long, slender, distal part bent approximately 90°, distal part chitinised with rows of short stiff setae, tapering to sharp tip (Fig. 35A–E). <b>Etymology.</b> From the Latin “ <i>planum</i> ” for flattened, alluding to the relatively flatter carapace of the species. <b>Remarks.</b> <i>Planaja plana</i> is superficially similar to <i>Sakaija japonica</i> in general form, especially with regard the relatively short ambulatory legs. <i>Planaja plana</i>, however, has six or seven lateral carapace spines behind the hepatic one and its dorsal surface is conspicuously less convex. Smaller specimens of <i>P. plana</i> about 20 mm in carapace width (e.g., 22.2 × 17.5 mm, 22.7 × 18.3 mm; ZRC 2013.1325) have a slightly more inflated carapace, and the G1 is less strongly bent outwards with the distal part relatively shorter (Fig. 35D). Surprisingly, this new genus and new species was obtained in large numbers in Balicasag, all collected by tangle nets. None were collected from trawls or dredges from the Philippines. The one specimen from Taiwan, a female (46.6 × 40.9 mm, ZRC 2001.0057), was obtained by a commercial trawl.
description: Published as part of <i>Ng, Peter K. L. &amp; Forges, Bertrand Richer De, 2015, Revision of the spider crab genus Maja Lamarck, 1801 (Crustacea: Brachyura: Majoidea: Majidae), with descriptions of seven new genera and 17 new species from the Atlantic and Indo-West Pacific, pp. 110-225 in Raffles Bulletin of Zoology 63</i> on pages 180-181, DOI: 10.5281/zenodo.5384590
description: {"references": ["Dai A-Y (1981) Two new species of Chinese Majidae (Crustacea: Brachyura). Acta Zootaxonomica Sinica, 6 (1): 36 - 38, figs. 1 - 10."]}