Phylum Echinodermata is made up of five classes: Asteroidea (sea stars), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies and feather stars), and Holothuroidea (sea cucumbers). This discovery of echinoderms from Morocco reveals a diverse range of body … Echinoderms are unique among animal phyla in having a pentaradial body plan, and their fossil record provides critical data on how this novel organization came about by revealing intermediate stages.

Here, we report a spiral-plated animal from the early Cambrian of Morocco that is the most primitive pentaradial echinoderm yet discovered. Answer: The echinoderms belong to the phylum Echinodermata and subphylum Deuterostomia. Phylum Echinodermata belongs to kingdom Animalia, they are triploblastic animals. Phylogenetic Relationships. Echinoderms are triploblastic Metazoa, which, despite their unique pentaradiate adult body plan, belong to the Bilateria. The major body plan for echinoderms is radially symmetrical, meaning that the more or less equal units are arranged in a circle around a central disc, rather than being bilaterally symmetrical like most other animals.

More specifically, echinoderms are members of the group Deuterostoma, i.e. Examples of echinoderms include sea star, sea urchins etc. | EduRev Class 11 Question is disucussed on EduRev Study Group by 163 Class 11 Students. Echinoderms are marine animals, they are unisexual and their body have a tough spiny exoskeleton. A.B. Jun 08,2020 - what is body plan of echinodermata ? Many echinoderms are based on a five-unit pattern, so they have a pentamerous (penta = five, mer = part) radial symmetry.

bilaterians in which the embryonic blastopore develops into the anus rather than the mouth. Sea stars have the typical echinoderm body plan — a central disk from which five or more arms radiate. Living classes differ principally in body plan. Smith, in Encyclopedia of Geology, 2005.

The oldest echinoderm faunas have previously been restricted to North America and had a radiate body plan. Echinoderms - Jourdanton ISD larvae's body plan becomes radially symmetrical.

They may have originated in the Precambrian (over 570 million years ago). Echinoderms have been well preserved as fossils; all existing classes and several others now extinct were present in the Ordovician (505-438 million years ago).

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