Parilia alcocki Wood-Mason, in Wood-Mason & Alcock 1891
Creators: name: Ng, Peter K. L.
name: Devi, Suvarna
name: Kumar, Appukuttannair Biju
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Leucosiidae
Parilia
Parilia alcocki

description: Parilia alcocki Wood-Mason, in Wood-Mason & Alcock, 1891
(Figs. 1A, 2A, 3A, 4A, B, 5 A–C, 6A, 7A, B, 8A–D, 9A, B)
Parilia alcocki Wood-Mason, in Wood-Mason & Alcock, 1891: 264; Wood-Mason, 1892: pl. 5 fig. 3, 3a; Alcock & Anderson, 1894: 177; Alcock, 1896: 198; Alcock, 1899: 28, pl. 4 fig. 1; Tirmizi & Serène, 1971: 30, text fig. 4 fig. 1; Tirmizi & Serène, 1971: 30, text fig. 4; Ng et al., 2008: 92; Krishnamoorthy, 2009: 2; Huys et al., 2014: 16; Lakshimi Pillai et al., 2013: 72, unnumbered colour figure; Prema et al., 2018: 112, figs. 1, 2, 4A–D, F, 5A–G.
Parilia (sic) alcocki – Lloyd, 1907: 3.
Material examined. 14 males (largest 70.6 × 52.2 mm, smallest 43.0 × 36.5 mm), 10 ovigerous females (largest 47.4 × 38.8 mm, smallest 41.2 × 34.4 mm) (CASAU), 1 male (66.1 × 57.4 mm), 2 ovigerous females (45.2 × 37.0 mm, 41.5 × 35.6 mm) (ZRC 2017.215), Pazhayar fish landing center, 11°21′30.28″N 79°49′39.83″E, Tamil Nadu, southeast India, 549 m, coll. M. Prema, 14 March 2017; 1 young male (24.8 × 23.4 mm) (ZRC 2017.216), fishing port, Tuticorin, Tamil Nadu, Southeast India, coll. A.B. Kumar et al., March 2017.
Diagnosis. Carapace transversely subovate (Figs. 1A, 2A, 3A); dorsal surface covered with numerous small granules (Fig. 3A); branchial regions prominently swollen laterally and dorsally (Figs. 1A, 2A, 3A, 4A); surface of carapace, chelipeds and ambulatory legs smooth or covered with small tubercles and granules; adult cephalothorax box-like in frontal view (Figs. 1A, 2A, 3A, 4A, 6A); frontal region set back such that part of buccal cavity and third maxillipeds visible in dorsal view, frontal lobes distinctly triangular (Fig. 3A); exopod of third maxilliped in adult very broad, appears foliaceous (Figs. 4B, 5A, C); surfaces of chelipeds and ambulatory legs covered with small tubercles and granules (Figs. 1A, 2A, 6A); G1 very elongate, distal part prominently flared, subdistal lateral projection dorso-ventrally flattened (Fig. 8 A–C); female sternopleonal cavity with prominent projection between vulvae (Fig. 9B). Indian Ocean.
Remarks. Prema et al. (2018) redescribed and figured this species at length and there is no need to elaborate on its taxonomy here. Parilia alcocki is distinct among congeners in possessing a transversely ovate carapace which is very swollen, and an exopod of the third maxilliped which is so broad in adults that it appears foliaceous.
Distribution. Known from the east coast of India and Bay of Bengal (Wood-Mason & Alcock 1891; Wood-Mason, 1892; Alcock & Anderson, 1894; Alcock, 1896; Alcock, 1899; Huys et al., 2014; Krishnamoorthy, 2009; Lakshimi Pillai et al., 2013; Prema et al., 2018), Arabian Sea (Lloyd, 1907) including Pakistan (Tirmizi & Serène, 1971). The species occurs at depths between 128–457 m (Alcock, 1896, 1899; Lloyd, 1907; Prema et al., 2018).
description: Published as part of Ng, Peter K. L., Devi, Suvarna & Kumar, Appukuttannair Biju, 2018, The genus Parilia Wood-Mason, in Wood-Mason & Alcock, 1891, with description of a new species and establishment of a new genus for P. tuberculata Sakai, 1961 (Crustacea, Brachyura, Leucosiidae), pp. 300-319 in Raffles Bulletin of Zoology 66 on page 301, DOI: 10.5281/zenodo.4503189