A Stereoscan electron microscope study of the male form ofHemiarthrus abdominalis(Kröyer) (Isopoda, Epicaridea, Bopyridae)

Abstract

Summary Observations have been made on the male form of Hemiarthrus abdominalis (Kröyer) (Isopoda, Epicaridea, Bopyridae) with the Stereoscan electron microscope. The male lacks eyes but has two slit-like openings in the dorsal cuticle of the head. The peraeon is clearly divisible into seven somites, each with a pair of robust, sub-chelate peraeopods. The somites of the pleon are fused to form a pleotelson which lacks pleopods and uropods, but has several ‘pores’ in the ventral cuticle.