Hyastenus campbelli Griffin and Tranter, 1986

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 : 49

Hyastenus campbelli Griffin and Tranter, 1986

( Fig. 6A)

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 29, 1 Ə ( CB 7.7 × PCL 12.4 mm), NSMT-Cr 30717; 1 $ (4.7× 7.4 mm), 4 juv. (2.6× 4.4 mm – 4.3× 7.2 mm), NSMT-Cr 30718. — Sta. 30, 1 ovig. $ ( CB 10.4 × PCL 15.8 mm), NSMT-Cr 30719 .

Remarks. Ng et al. (2008) enumerated 37 species in the genus Hyastenus . After that, three species were described from the West Pacific: H. baru Windsor and Ahyong, 2013 , H. tabolongi Lee and Ng, 2019 from north Sulawesi, H. duca- tor Lee and Ng, 2020 from China. In addition, H. verreauxii A. Milne-Edwards, 1872 from lNouvelle-Hollandez (= Australia) was synonymized under H. elatus Griffin and Tranter, 1986 from Sydney Harbour, based on the reversal of precedence under the provisions of the International Cord of Zoological Nomenclature invoked by Lee et al. (2018). Consequently, the genus Hyas- tenus presently comprises 39 species.

The present specimens identified as H. camp- belli essentially agree with the original description by Griffin and Tranter (1986), though there is a small tubercle on the hepatic region and no broad low tubercle near posterolateral angle of the pleonites 4 and 5. The 15.8 mm in CL measurement is the smallest record for an ovigerous female of the species.

Hyastenus campbelli is similar to H. diacan- thus (De Haan, 1837), H. cracentis Griffin and Tranter, 1986 , and H. elatus , but distinguished from them by the absence of tubercle from both the protogastric and mesogastric regions. Other differences were discussed by Griffin and Tranter (1986).

Distribution. Irian Jaya, Aru Island, Sahul Shelf, and northern and western Australia; low intertidal to 115 m depth. This species has been dredged and trawled from sandy to sandy-mud substrates with coral, sponge, rubble and shells ( Davie, 2002).