Heteropilumnus satriai Yeo, Rahayu and Ng, 2004

Ng, Peter K. L., Lin, Chia-Wei & Ho, Ping-Ho, 2018, Psammoecus hiranoi Yoshida and Hirowatari 2013, Zoological Studies 57 (12), pp. 1-17 : 3-7

publication ID	https://doi.org/ 10.6620/ZS.2018.57-12
DOI	https://doi.org/10.5281/zenodo.12825445
persistent identifier	https://treatment.plazi.org/id/039C87E6-2F10-115E-FC84-77054691FE33
treatment provided by	Felipe
scientific name	Heteropilumnus satriai Yeo, Rahayu and Ng, 2004
status

Treatment

Heteropilumnus satriai Yeo, Rahayu and Ng, 2004 View in CoL

( Figs. 1 View Fig D-F, 5-9)

Heteropilumnus satriai Yeo, Rahayu and Ng, 2004: 80 View in CoL , fig. 1; Ng et al. 2008: 140.

Material examined: Holotype - male (19.3 × 13 mm) ( MZB Cru 1668), station EA-D 11, rocky islet southeast of Pulau Laut , Natuna Island , Indonesia, coll. Anambas Expedition, 16 March 2002. Others - 1 male (11.1 × 8.2 mm) ( NMMBCD4085 ), under rock with sandy substrate, Hojie , Kentin , 21°57.432'N 120°42.631'E, southern Taiwan, by SCUBA, coll. C.-W. Lin, 8 July 2013; 1 male (18.3 × 13.0 mm) ( ZRC 2017.1043 View Materials ), under rock with sand substrate, Houbihu, Kentin, Taiwan, by SCUBA, coll. C.-W. Lin, 8 June 2016; 2 females (16.1 × 11.9 mm, 6.8 × 5.4mm), Lutao (= Green Island), southern Taiwan, by SCUBA, coll. C.- W. Lin, 24 June 2017; 1 female (11.4 × 8.2 mm) ( NMMBCD4086 ), under large rock, sand substrate, Lutao (= Green Island), southern Taiwan, by SCUBA, coll. C.-W. Lin, 16 August 2017. GoogleMaps

Colour: The colour and patterning in H. satriai in life is similar to that of H. decharmoyi except that the red patches on the ambulatory legs are relatively smaller and more uneven ( Figs. 1D, E View Fig ). There is some variation in this species, from having the red colour cover most of the carapace ( Fig. 1D View Fig ) to only covering less than half the surface ( Fig. 1E View Fig ), to the carapace and pereopods being mostly yellowish-white with only small patches of orange in small specimens ( Fig. 1F View Fig ).

Remarks: This species was described from one male, which was parasitized by a rhizocephalan and collected from the Indonesian Natuna Islands in the South China Sea ( Yeo et al. 2004). No colour notes were available at the time. The specimens from Taiwan now allow us a better understanding of its colour, morphological characters and variation.

The teeth on the anterolateral margin of smaller specimens (e.g., 11.1 × 8.2 mm, NMMBCD 4085) are less well defined, with the lobes relatively lower ( Fig. 6B View Fig ). In larger specimens (e.g., holotype male and male 18.3 × 13.0 mm, ZRC 2017.1043); the teeth are better defined and separated by more distinct clefts ( Figs. 5B View Fig , 6D View Fig ). The male pleon of the holotype male is atypical as the specimen was infected with a rhizocephalan ( Fig. 6F View Fig ). The pleon of the uninfected males is more triangular, with the telson semicircular in shape ( Figs. 7C, D View Fig , 8C, D View Fig ). The G1 of the present material varies slightly with size. In the larger male (18.3 × 13.0 mm, ZRC 2017.1043), the distal elongated part of the G1 is gently curved to relatively straight ( Figs. 9 View Fig A-C) whereas in the smaller male (11.1 × 8.2 mmm, NMMBCD 4085), it is gently sinuous with the tip gently curved upwards ( Figs. 9 View Fig E-G). The form of the G1 of the smaller male agrees very well with that figured by Yeo et al. (2004: fig. 1e, f) for the holotype.

The differences between H. satriai and H. decharmoyi have been discussed under the latter species. Heteropilumnus satriai is also similar to H. granulimanus Ward, 1933 , described from one male measuring 12.0 × 9.0 mm from the Capricorn Group of islands in Queensland, Australia. In H. granulimanus ; however, the frontal margin is more truncate with the two lobes separated by a narrow fissure ( Ward 1933: pl. 2 fig. 3) (vs. the two frontal lobes separated by a distinct V-shaped cleft in H. satriai , Figs. 5B View Fig , 6B, D View Fig ); the granules on the outer surface of the chela are more rounded, densely packed and arranged in rows ( Ward 1933: pl. 2 fig. 4) (vs. the granules are rounded to conical and distributed evenly on surface in H. satriai , Figs. 5E View Fig , 7E View Fig ); and the male telson is relatively wider ( Ward 1933: pl. 2 fig. 4) (vs. less wide in in H. satriai , Figs. 7C, D View Fig ).

Distribution: The species was described from the Natunas Islands in Indonesia, in the South China Sea ( Yeo et al. 2004), and is now recorded from Taiwan.