Pilumnus semilanatus Miers, 1884

Manikandan, K, Megalaa, N, Valliappan, Subramanian, Nandini, K, Rani, Lourdu V, Dakshinamurthi, Senthil & Nagappan, Nagappan, 2022, Crabs (Crustacea, Decapoda) from the Seas of East and Southeast Asia Collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 3. Sahul Shelf, Bulletin of the National Museum of Nature and Science. Series A, Zoology 48 (2), pp. 35-83 : 74-75

Pilumnus semilanatus Miers, 1884

( Fig. 18C )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 29, 1$ ( CB 14.7 ×CL 11.1 mm) , 5 juv., NSMT-Cr 30761.

Remarks. Pilumnus similanatus is quite characteristic among many species of the genus Pilumnus in having scattered tufts and rows of long shaggy setae symmetrically arranged on the carapace dorsal surface ( Fig. 18C ). The carapace is substantially bare, as well as the upper surfaces of the cheliped carpus and palm. The main characters of the carapace, chelipeds and ambulatory legs were discussed by Takeda and Miyake (1968: figs. 1a–c, pl. 1 fig. B) based on Arafura Sea specimens, including habitus and G1 figures. Otherwise, line drawings have been provided by the original author ( Miers, 1884: pl. 22 fig. B) and McCulloch (1913: fig. 43), and photographs by Rathbun (1923: pl. 24 figs. 1–2).

Distribution. Endemic to Australia, from Moreton Bay, Queensland to Shark Bay, Western Australia, 15–52 m depth.

Figures

Fig. 18.ɹA–B: Pilumnus rotundus Borradaile, $ (NSMT-Cr 30760; CB 10.6×CL 7.5 mm) from sta. 29. C: Pilumnus semilanatus Miers, $ (NSMT-Cr 30761; CB 14.7×CL 11.1mm) from sta. 29. D: Pilumnus minutus (De Haan), Ə (NSMT-Cr 30755; CB 8.9×CL 6.1mm) from sta. 29. E–F: Pilumnus longicornis Hilgendorf, Ə (NSMT-Cr 30754; CB 11.2×CL 8.6mm) from sta. 29.