Segmentation in the body is first observed in which of the following: (a) Platyhelminthes (b) Aschelminthes (c) Annelida (d) Arthropoda
Option 'c' is correct Annelida – annulus: little rings i.e. segmentation Phylum Annelida is a very broad phylum belonging to the kingdom Animalia. Option 'a' is incorrect Platyhelminthes - platy: flat; helminths: worms Platyhelminthes are a phylum of simple bilaterian, unsegmented, soft-bodied invertebrates which can be free-living or parasite Option 'b' is incorrect Aschelminthes – asche: round; helminths: worms An invertebrate animal belonging to a group of phyla that are distinguished by the lack of a well-developed coelom and blood vessels. Option 'd' is incorrect Arthropoda – arthro: jointed; poda: legs The processof segment fusion, or tagmosis, usually results in an arthropod body that consists of three major sections, a head, thorax, and abdomen. Final Answer Option 'c' is correct
