Hyastenus convexus Miers 1884

"The one specimen in the collection is a female, and differs from Miers' (a male) in that: (i) the horns are less strongly divergent, (ii) the palm is slenderer and the fingers much less gaping. The species is allied to H. calvarius but differs in that: (i) the horns are more slender and diverge more strongly, curving, as well as slanting, outwards, (ii) there is no trace of a knob on the gastric mound, which is also more prominent, (iii) there is no epibranchial spinule or intestinal spine, (iv) the carapace is narrower, and (v) the palm is rather more swollen (Borradaile 1903; pg. 687-688)."

Hyastenus convexus can be found around East Africa and the Red Sea (WoRMS 2009)

"It was dredged in 30 fathoms in Suvadiva Atoll (Borradaile 1903; pg. 686)."

Hyastenus convexus Miers

Hyastenus (Chorilia) convexus Miers, 1884:196, pl. 18: figs. B, b.

Hyastenus convexus.—De Man, 1902:664–666, pl. 22: fig. 32.—Balss, 1935:124.—Griffin, 1966a:282.

MATERIAL EXAMINED.—1 , 5 , 7.8–22.3 mm (USNM 135142–43, 135165–67).

Anton Bruun Cruises: SE Andaman Sea, Sta. 18A, 77 m, 1 spec. NE Bay of Bengal, Sta. 47B, 30–22 m, 1 spec. E of Durban, Sta. 391J, 57 m, 1 spec; Sta. 394B, 68–70 m, 1 spec. Off Cape Guardafui, Sta. 442, 70–80 m, 2 specs.

DISTRIBUTION.—Indo-West Pacific from eastern Africa through Malay Archipelago to northern Australia and the Philippine Islands.