As central organs we have to note the brain-lobes and the longitudinal lateral cords which form one continuous unsegmented mass of fibrous and cellular nerve-tissue.
42) the six somites of the mesosoma are not fused to form a carapace at an early stage, and they are followed by three separately marked metasomatic somites; the other three somites of the metasoma have disappeared in Limulus, but are represented (From Lankester, loc. cit.) by the unsegmented prae-anal region.
The unsegmented dense chitinous sternal plate of the metasoma (XIII to XVIII) is not removed.
- Section through an early embryo of Limulus longispina, showing seven transverse divisions in the region of the unsegmented anterior carapace.
Met, Unsegmented metasoma.
How would you define unsegmented? Add your definition here.