What phylum is Ecdysozoa in?
Theories, Development, Invertebrates The ecdysozoan phyla are the arthropods (e.g., insects, crustaceans, myriapods, and chelicerates), onychophorans (velvet worms), tardigrades (water bears), nematodes (roundworms), nematomorphs (horsehair worms), priapulids, loriciferans, and kinorhynchs (mud dragons).
Are starfish Ecdysozoa?
SUBPHYLUM Asterozoa (free-moving echinoderms with flattened, star-shaped bodies): CLASS Asteroidea (sea stars, also called starfish) These familiar sea creatures are predators that move about with five radial arms. The arms touch one another at their base of attachment to the central disk.
Are all echinoderms Pentaradial?
Although very diverse in body form, all echinoderms possess the typical pentaradial symmetry of the phylum and their limbs and organs generally exist in multiples of five. As adults, echinoderms usually lack an anterior head region. All echinoderms possess a unique water vascular system, found only in this phylum.
What makes Ecdysozoa unique?
The most distinguishing and prominent feature of Ecdysozoans is their cuticle: a tough, but flexible exoskeleton that protects these animals from water loss, predators, and other aspects of the external environment. All members of this superphylum periodically molt or shed their cuticle as they grow.
Which of the following characteristics indicates that nematodes belong to Ecdysozoa?
The ecdysozoans include nematodes, arthropods, and other phyla that have tough external coats, or cuticles, that must be shed as they grow. This process of shedding, or molting, is called ecdysis. Nematodes, or roundworms, are unsegmented pseudocoelomate worms that lack a circulatory system.
Are flatworms Ecdysozoa?
The flatworms are acoelomate organisms that include free-living and parasitic forms. The nematodes, or roundworms, possess a pseudocoelom and consist of both free-living and parasitic forms. The nematodes and the arthropods belong to a clade with a common ancestor, called Ecdysozoa.
What classification is Ecdysozoa?
Integrated Taxonomic Information System – Report
| Superphylum | Ecdysozoa |
| Direct Children: | |
| Phylum | Arthropoda – Artrópode, arthropodes, arthropods |
| Phylum | Kinorhyncha Reinhard, 1881 – kinorhynchs, quinorrinco |
| Phylum | Loricifera Kristensen, 1983 – loricifero, loriciferans |
What trait is common in Ecdysozoa?
Characteristics. The most notable characteristic shared by ecdysozoans is a three-layered cuticle (four in Tardigrada) composed of organic material, which is periodically molted as the animal grows. This process of molting is called ecdysis, and gives the group its name.
What is true of the group Ecdysozoa?
What is Ecdysozoa?
Ecdysozoans are a morphologically heterogeneous group of animals which have a cuticle and grow by molting and include the arthropods and nematodes. The Ecdysozoa is the second major clade within the Bilateria (Figures 1 and 6 ), and it includes a subset of the animal phyla generally considered part of the Protostomia.
How is an ecdysozoan skeleton different from other animals?
Unlike other animals with skeletons who build their body’s support from minerals, an ecdysozoan builds a cuticle, an outer layer of organic material that functions as its skeleton. This means that the skeleton can be built thinner and lighter than in other animals, and does not require a source of minerals for its construction.
How do ecdysozoans reproduce?
Also unlike basal animals, deuterostomes, and lophotrochozoans who reproduce by simply releasing mass quantities of egg and sperm cells into the water in the hopes that fertilization will occur, many species of ecdysozoans have separate sexes who come together and copulate.
What is the sister taxon to Lophotrochozoa?
Lophotrochozoa is one of the three major clades that comprise bilateral animals, or Bilateria. Another superphylum Ecdysozoa, comprising nematodes, arthropods, and their relatives and which are defined by molting, are the sister taxon to Lophotrochozoa.