Neparilia Ng & Devi & Kumar 2018, new genus
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
Neparilia

description: Neparilia, new genus
Diagnosis. Carapace ovate; dorsal surface covered large rounded tubercles and granules. Cardiac region with low rounded tubercle; intestinal region with 2 short spines. Exopod of third maxilliped broad, distinctly wider than ischium and merus, with outer margin strongly convex; coxa wide, not semicircular in shape, not bracketing base of exopod. Suborbital region prominently compressed by expanded buccal cavity. Adult male chelipeds about 2 times longer than carapace length; chela not elongate, fingers longer than palm, in large male individuals, closing tightly. Male pleon with somites 1 and 2 free, somites 3–5 completely fused, somite 6 separated from somite 5 by suture but immobile, telson free; distal and proximal surfaces of somite 6 each with a distinct cup-shaped tubercle, that on distal part larger; telson elongate, linguiform, longer than somite 6. G1 slender, distal part tapering without lateral projection or flanges. G2 distal segment as long as basal segment, with curved flagelliform tip.
Type species. Parilia tuberculata Sakai, 1961, by monotypy and present designation.
Etymology. From the Latin “ne-” for not, alluding to the present realisation that the type species is not a member of Parilia. Gender feminine.
Remarks. Sakai (1961) placed this species in Parilia because it possessed a very broad exopod of the third maxilliped. It is, however, not possible to retain P. tuberculata in Parilia because the coxa of the third maxilliped is not substantially laterally expanded or semicircular (Figs. 10C, 11B) (vs. coxa prominently expanded laterally, appearing semicircular in Parilia; Figs. 4, 5); the adult male chelipeds are relatively short (about 2 times carapace length), the chela are not elongate with the fingers longer than the palm (Figs. 10A, 11G) (vs. adult male chelipeds more than 3 times longer than carapace length, chela prominently elongate with fingers much shorter than palm in Parilia; Figs. 1, 6); the surfaces of the ambulatory meri are covered with short, sharp spines (Figs. 10A, 11C, D) (vs. surface of ambulatory meri smooth or covered with granules, never spiniform in Parilia; Figs. 1, 2); the male pleonal somites 5 and 6 are functionally fused even though there is a distinct suture separating them and somite 6 has a cup-like tubercle on both the distal and proximal surfaces, with the distal one more prominent (Fig. 11C, E, F) (vs. male pleonal somites 5 and 6 mobile, surface of somite 6 smooth in Parilia; Fig. 7A, C, E, G); the male telson is linguiform and much longer than somite 6 (Fig. 11C, E) (vs. telson triangular, subequal in length to somite 6 in Parilia; Fig. 7A, C, E, G); and the G1 is straight, without a subdistal lateral projection, not flared and lacks serrulate flanges distally (Fig. 12 A–C) (vs. distal part of G1 bifurcated, with prominent lateral projection, each projection fared with serrulate or denticulate flanges in Parilia; Fig. 8 A–C, E–H, J–L, N–R).
The carapace and general external features of Neparilia resemble Galilia Ng & Richer de Forges, 2007 (type species Galilia narusei Ng & Richer de Forges, 2007), but several features easily distinguish them. In Galilia, the exopod of the third maxilliped is transversely narrower than the endopod (Ng & Richer de Forges, 2007: fig. 2E; Komai & Tsuchida, 2014: figs. 19B, 21A) (vs. exopod is distinctly broader than the endopod in Neparilia; Figs. 10C, 11B); the intestinal region has two large rounded tubercles (Ng & Richer de Forges, 2007: fig. 2F; Komai & Tsuchida, 2014: fig. 19A, C) (vs. intestinal region with two short spines in Neparilia; Figs. 10B, 11D); the fingers of the chela are shorter than the palm (Ng & Richer de Forges, 2007: fig. 3D–F; Komai & Tsuchida, 2014: fig. 20A) (vs. fingers distinctly longer than the palm in Neparilia; Fig. 11G); the male telson is prominently elongate with the male sternopleonal cavity reaching to the suture between thoracic sternites 2 and 3 (Ng & Richer de Forges, 2007: fig. 3A, B; Komai & Tsuchida, 2014: figs. 19F, 21B) (vs. male telson proportionately shorter and the male sternopleonal cavity reaches only to the midpoint of sternite 3 in Neparilia; Fig. 11C, E); the surface of male pleonal somite 6 has a truncate tubercle on the distal margin (Ng & Richer de Forges, 2007: fig. 3A, B; Komai & Tsuchida, 2014: fig. 19F) (vs. the surface has a cup-like tubercle on both the proximal and distal surfaces in Neparilia; Fig. 11C, E); male pleonal somites 5 and 6 are completely fused, separated at most by a shallow suture (Ng & Richer de Forges, 2007: fig. 3A; Komai & Tsuchida, 2014: fig. 19F) (vs. somites 5 and 6 are free and separated by a deep suture in Neparilia; Fig. 11C, E); and the distal third of the G1 is prominently bent (Ng & Richer de Forges, 2007: fig. 4G, H; Komai & Tsuchida, 2014: fig. 21C, D; Shih et al., 2013: fig. 3A, B) (vs. G1 straight in Neparilia; Fig. 12 A–C).
Neparilia also superficially resembles Urashima Galil, 2003 (type species Randallia pustuloides Sakai, 1961) (Fig. 14A), but in Urashima, the third maxilliped has the exopod only slightly broader than the exopod (Fig. 14C, D); the fingers of the chela are shorter than the palm (Fig. 14G; Sakai, 1961: pl. 3 fig. 4; Sakai, 1976: pl. 30 fig. 1; Galil, 2003: fig. 2E, F; Tan et al., 2000: fig. 3b) (vs. fingers distinctly longer than the palm in Neparilia; Fig. 11G); the surface of male pleonal somite 6 has a spine on the distal margin (Fig. 14E; Galil, 2003: 416); and male pleonal somites 5 and 6 are completely fused (Fig. 14F; Galil, 2003: 416). While the G1s of the two genera are superficially similar in general shape, that of Urashima has the distal quarter distinctly chitinised and spatuliform (Fig. 15 A–D) (vs. the distal part is not chitinised and conical in Neparilia; Fig. 12 A–C).
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 pages 311-317, DOI: 10.5281/zenodo.4503189