Genus Rhysida H.C.Wood, 1862

Type-species. Branchiostoma lithobioides Newport, 1845 (by subsequent designation).

Range. Indo-Australia, Ethiopia, Neotropical region .

Remarks. Koch (1983) compared the size of spiracles of Rhysida and Ethmostigmus . At page 836 he stated that anteriormost spiracle in the former is considerably shorter than half of the length of the lateral margin of respective tergite. However, some of examined adults of R. l. longipes (No. 6633, 7003) have the spiracles of the 3rd body segment at least as long as ½ of the length of corresponding tergite (Fig. 18).