Closed hydrovascular for echinoderms, open haemolymphatic for arthropods. ^^
legs.
Sponges, Cnidarians, Mollusks, and Echinoderms are not Arthropods.
A. Arthropods
sponges+mollusks+arthropods+worms+octopods+echinoderms
Gills and a well developed nervous system
Lobsters are neither echinoderms nor mollusks like clams. They are also not arachnids. Instead, they are crustaceans, a subsection of arthropods.
Echinoderms are mostly marine while arthropods dwell in almost all habitats.
The eight groups are:* Mollusks * Echinoderms * Arthropods * Annelids * Nematodes * Porifera* Platyhelminthes * Coelenterates Or go to:What_are_the_8_groups_of_invertebrates
The types of organisms which have segmented bodies include annelids, arthropods, echinoderms, and chordates. Some of the most obvious examples of segmentation are found in insects which belong to the arthropods.
i dont know thats why im asking you
the 8 groups of invertebrates are the arthropods, poriferans, platyheminthes, coelenterates, nematoeds, mollusks, echinoderms, and annelids