Neparilia, Ng & Devi & Kumar, 2018

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), Raffles Bulletin of Zoology 66, pp. 300-319 : 311-317

publication ID	https://doi.org/ 10.5281/zenodo.4503189
publication LSID	lsid:zoobank.org:pub:CBB28174-9B04-4A65-8C7C-5EB4B3608D98
DOI	https://doi.org/10.5281/zenodo.4502853
persistent identifier	https://treatment.plazi.org/id/B8804A57-EA6B-4271-AA80-A4BD65B13AC0
taxon LSID	lsid:zoobank.org:act:B8804A57-EA6B-4271-AA80-A4BD65B13AC0
treatment provided by	Carolina
scientific name	Neparilia
status	gen. nov.

Treatment

Neparilia View in CoL , 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 View in CoL , 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 View Fig , 11B View Fig ) (vs. coxa prominently expanded laterally, appearing semicircular in Parilia ; Figs. 4 View Fig , 5 View Fig ); 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 View Fig , 11G View Fig ) (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 View Fig , 6 View Fig ); the surfaces of the ambulatory meri are covered with short, sharp spines ( Figs. 10A View Fig , 11C, D View Fig ) (vs. surface of ambulatory meri smooth or covered with granules, never spiniform in Parilia ; Figs. 1 View Fig , 2 View Fig ); 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 View Fig ) (vs. male pleonal somites 5 and 6 mobile, surface of somite 6 smooth in Parilia ; Fig. 7A, C, E, G View Fig ); the male telson is linguiform and much longer than somite 6 ( Fig. 11C, E View Fig ) (vs. telson triangular, subequal in length to somite 6 in Parilia ; Fig. 7A, C, E, G View Fig ); and the G1 is straight, without a subdistal lateral projection, not flared and lacks serrulate flanges distally ( Fig. 12 View Fig A–C) (vs. distal part of G1 bifurcated, with prominent lateral projection, each projection fared with serrulate or denticulate flanges in Parilia ; Fig. 8 View Fig 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 View Fig , 11B View Fig ); 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 View Fig , 11D View Fig ); 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 View Fig ); 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 View Fig ); 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 View Fig ); 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 View Fig ); 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 View Fig A–C).

Neparilia also superficially resembles Urashima Galil, 2003 (type species Randallia pustuloides Sakai, 1961 ) ( Fig. 14A View Fig ), but in Urashima , the third maxilliped has the exopod only slightly broader than the exopod ( Fig. 14C, D View Fig ); the fingers of the chela are shorter than the palm ( Fig. 14G View Fig ; 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 View Fig ); the surface of male pleonal somite 6 has a spine on the distal margin ( Fig. 14E View Fig ; Galil, 2003: 416); and male pleonal somites 5 and 6 are completely fused ( Fig. 14F View Fig ; 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 View Fig A–D) (vs. the distal part is not chitinised and conical in Neparilia ; Fig. 12 View Fig A–C).