Tetralia nigrolineata Serène and Pham, 1957

Shaga, I Bevin, Priya, K, Ramar, Selvakumar, Srinidhi, S, Mohan, G Chandra, Ranganathan, Sukanya, Moulvi, S M M & Mani, Bhuvaneswari, 2023, A Small Collection of Subtidal Crabs (Crustacea: Decapoda: Brachyura) from the Palau Islands Collected by Dredging, Bulletin of the National Museum of Nature and Science. Series A, Zoology 49 (1), pp. 7-42 : 27

Tetralia nigrolineata Serène and Pham, 1957

( Figs. 10F , 11A–B )

Material examined. Off Kwannon , Koror I., Palau Is., dredged, with coralline algae; 1♂ (cb 5.1×cl 4.1 mm), NSMT-Cr 30988, 1 ovig.♀ (5.8× 4.9 mm), NSMT-Cr 30989, 1 ♂ (5.2× 4.4 mm), 1 ovig.♀ (5.1× 4.1 mm), NSMT-Cr 30990; June 17, 1980; K. Baba leg.

Remarks. In these specimens ( Fig. 11A–B ) long preserved in spirit, the color pattern is still traceable; the frontal margin and the anterior halves of both lateral margins of the carapace are dark brown bordered with a whitish line along the inside margins. The transverse whitish line behind the frontal dark brown is extended laterally onto the eyestalk. The carapace shape and color pattern agree with the photographs by Serène (1984, pl. 40 fig. E., as T. glaberrima obscura ), Galil (1988, fig. 1c) and Castro (1997, pl. 1 fig. D), and also with the vivid color photographs given by Maenosono (2017, fig. 8C–D) who checked the accuracy of records in various publications and research papers on the basis of the color pattern. Castro (1997) examined many specimens from many localities and designated the neotype for the subsequent taxonomic studies. The G1 is fringed with setose hairs along both sides as seen in Fig. 10F and agrees generally with rough sketch given by Galil (1988, fig. 2f), but is not strictly comparable with it.

Distribution. This species is generally associated with pocilloporid corals widely distributed in the Indo-West Pacific from Japan to Australia, New Caledonia, and Madagascar. New to the Palau Islands.

Figures

Fig. 10. A: Trierarchus squamosus (Stephenson and Hudson, 1957), ♂ (NSMT-Cr 30977; cb 12.6×cl 8.7mm). Front-orbital region in dorsal view. B–C: Chlorodiella xishaensis Chen and Lan, ♂ (NSMT-Cr 30983; cb 8.0×cl 5.7mm). Left G1 in ventral view (B) and right third ambulatory leg in dorsal view (C). D–F: Chlorodiella corallicola Miyake and Takeda, ♂ (holotype, ZLKU 1724; cb 6.6×cl 4.4mm). Distal part of right G1 in ventral (D) and sternal (E) views (original figures by Miyake and Takeda, 1968). Scales for A=5mm, B= 0.5mm, C=3 mm, F=0.5 mm.

Fig. 11. A–B: Tetralia nigrolineata Serène and Pham, 1957, ♂ (NSMT-Cr 30988; cb 5.1×cl 4.1 mm) (A) and ovig.♀ (NSMT-Cr 30988; 5.8×4.9 mm) (B). C–E: Notonyx aff. sagittifer Ng and Clark, 2010, ♂(NSMT-Cr 30991; cb 5.0×cl 3.3 mm), carapace in dorsal view (C), both chela in outer view (D) and both chelipeds in dorsal view (E).