Notonyx guinotae Rahayu & Ng, 2010

Rahayu, Dwi Listyo & Ng, Peter K. L., 2010, The species of Notonyx A. Milne-Edwards, 1873, from Lesser Sunda and Maluku Islands, Indonesia, with description of a new species (Crustacea: Decapoda: Brachyura: Goneplacidae), Zootaxa 2570, pp. 51-60 : 54-56

Notonyx guinotae Rahayu & Ng, 2010

( Figs. 4 , 5A–E , 6 B)

Notonyx guinotae Rahayu & Ng, 2010: 271 , figs. 1–5.

Material. Holotype, male, 15.5 × 11.5 mm ( MZB Cru 2583), Sira, northern Lombok, Lesser Sunda Islands, 0 8°21.641’S 116°06.272’E, coll. D. L. Rahayu, 13 May 2007. Paratypes: 1 female, 6.5 × 4.7 mm ( MZB Cru 2584), 1 female, 7.5 × 5.6 mm ( ZRC 2009.0746), same locality as holotype; 2 males, 5.9 × 4.9 mm, 11.4 × 8.2 mm ( ZRC 2009.0745), Kuta, central Lombok, Lesser Sunda Islands, coll. D. L. Rahayu, 18 August 2006; 1 male, 7.8 × 6.0 mm ( MZB Cru 2585), Medana, northern Lombok, Lesser Sunda Islands, 0 8°21.791’S 116°07.608’E, coll. D. L. Rahayu, 12 June 2007; 1 male, 7.0 × 5.8 mm ( MZB Cru 2586), Sekotong, western Lombok, Lesser Sunda Islands, coll. D. L. Rahayu, 16 May 2007. Others: 1 male (5.5 × 4.1 mm) ( ZRC 2010.0293), Ekas, eastern Lombok, Lesser Sunda Islands, coll. 14 May 2007; 1 female 4.7 × 3.6 mm ( ZRC 2010.0294), Ekas, eastern Lombok, Lesser Sunda Islands, 0 8°52,9’S 116°27,261’E, coll. 23 July 2009. 1 male, (8.25 × 6 mm) ( MZB Cru 2782), Sira, northern Lombok, Lesser Sunda Islands, 08°21.641'S, 116°06.272' E, coll. 21 July 2009.

Remarks. The species has been characterised and discussed at length by Rahayu & Ng (2010). A colour figure of the holotype (15.5 × 11.5 mm, MZB Cru 2583) ( Fig. 6 B) is provided here for the first time.

Two small specimens from Ekas in Lombok (ZRC 2010.0293, ZRC 2010.0294) are referred to N. guinotae with doubt. Both are still juvenile, and even though the G1 and G2 are discernible in the male, they are poorly chitinised and clearly immature. While its carapace, third maxillipeds, chelae and ambulatory legs ( Fig. 4 ) are similar, the male abdomen is quite different from what was reported by Rahayu & Ng (2010), being proportionately narrower ( Fig. 5A ) (see Rahayu & Ng 2010: fig. 3D). It is possible that this represents the juvenile form of the male abdomen in this species. It is noteworthy that the male abdomen of the juvenile male closely resembles that figured for N. vitreus Alcock, 1900 (see Serène & Soh 1976) but in the form of the carapace, chelipeds and gonopods, differ markedly. Specimens of N. vitreus the size of the present material (5 mm carapace width) are also already fully mature. The G1 from of the small specimen is also relatively straighter than what was reported in the description of the species ( Fig. 5B, C ), but this is possible because the G1 tends to be more curved as specimens increase in size (see Rahayu & Ng 2010: fig. 4). The G2 is clearly immature in form ( Fig. 3 D, E). The tooth on the inner angle of the carpus of the cheliped in both specimens ( Fig. 4 D) is also relatively longer than that reported in the type series of N. guinotae (see Rahayu & Ng 2010: fig. 3E) but this is probably a consequence of size.

Figures

FIGURE 3. Notonyx castroi n. sp., A – C, F, G, holotype, male, 7.2 × 5.6 mm (MZB Cru 2780); D, E, paratype, 4.7 × 3.7 mm (ZRC 2010.0291). A – E, left G 1 s (drawn from different angles); F, G, left G 2. Scales = 1 mm.

FIGURE 4. Notonyx guinotae Rahayu & Ng, 2010, male, 5.5 × 4.1 mm (ZRC 2010.0293). A, carapace; B, left third maxilliped; C, outer view of right chela; D, carpus of right cheliped; E, fourth walking leg. Scales = 1 mm.

FIGURE 6. Colours in life. A, Notonyx gigacarcinicus Clark & Ng, 2006, male, 10.0 × 7.8 mm (MZB Cru 2783); B, N. guinotae Rahayu & Ng, 2010, holotype, male, 15.5 × 11.5 mm (MZB Cru 2583).

FIGURE 5. A – E, Notonyx guinotae Rahayu & Ng, 2010, male, 5.5 × 4.1 mm (ZRC 2010.0293); F, G, N. gigacarcinicus Clark & Ng, 2006, holotype (ZRC 2000.0981), male 12.1 × 8.7 mm. A, abdomen; B, C, left G 1; D – G, left G 2. Scales = 1 mm.