Is Annelida Lophotrochozoa or Ecdysozoa?

Is Annelida Lophotrochozoa or Ecdysozoa?

Ecdysozoa include the nematodes, arthropods, onychophorans , and tardigrades, whereas lophotrochozoan include flatworms, nemerteans, mollusks, annelids, lophophorate, and rotifer.

Are annelids Ecdysozoa?

Nielsen has suggested that a possible solution is to regard Ecdysozoa as a sister-group of Annelida, though later considered them unrelated.

What defines Lophotrochozoa?

Introduction. Lophotrochozoa is a monophyletic group of animals that includes annelids, molluscs, bryozoans, brachiopods, platyhelminthes, and other animals that descended from the common ancestor of these organisms. Lophotrochozoa is one of the three major clades that comprise bilateral animals, or Bilateria.

What is the most important Synapomorphy for Ecdysozoa?

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. The key synapomorphy uniting the ecdysozoans is the possession of a cuticle that is periodically molted (a process named ecdysis).

Is Cnidaria a Lophotrochozoa?

The Cnidarians (jellyfish and their relatives) represent the basal animals. The Lophotrochozoans (Phyla Platyhelminthes, Mollusca, Annelida and Rotifera) represent one of the major groups of invertebrates outside of the arthropoda.

Is Lophotrochozoa a phylum?

Phylum Platyhelminthes. Most of the flatworms are classified in the superphylum Lophotrochozoa, which also includes the mollusks and annelids.

What is the key characteristic of the ecdysozoa?

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.

What term best describes the nervous system of ecdysozoa?

What term best describes the nervous system of ecdysozoa? Runged. Compared to the lophotrohozoa, the ecdysozoans developed one distinct advantage. Specifically this includes: Wings.

What are the two characteristics that unite the clade Lophotrochozoa and what are their functions?

Characteristics. The clade Lophotrochozoa is named after the two distinct characteristics of its members; the feeding structure lophophore, which is a ciliated crown of tentacles surrounding a mouth, and the developmental stage trochophore larvae.

What is the defining feature of the lophotrochozoans quizlet?

What are the defining characteristics of a lophotrochozoan? They have a lophophore feeding structure OR a trochophore larval stage.

Is ecdysozoa bilateral symmetry?

The bilaterally symmetrical animals are further divided into deuterostomes (including chordates and echinoderms) and two distinct clades of protostomes (including ecdysozoans and lophotrochozoans) (Figure 3).

Are rotifers Lophotrochozoa?

The Lophotrochozoa are a diverse group of phyla. Phylum Rotifera: Rotifers, with a wheel-like crown of cilia at one end. Phylum Acanthocephala: Spiny-headed, parasitic worms.

Is the Lophotrochozoa part of the ecdysozoan hypothesis?

Simultaneously with the ecdysozoan hypothesis, another major clade of invertebrates, Lophotrochozoa, has been proposed. This is an even more puzzling entity, where evolutionarily primitive Plathelminthes with two germ layers are united with such highly evolved three-layered animals as, for example, Mollusca.

What kind of phylum is the Lophotrochozoa?

Lophotrochozoa one group of bilaterians; 18 phyla grouped by molecular phylogenetic; platyhelminthes, annelida, and mollusca are phylum that have ciliated trochophore type larvae; ectoprocta and brachiopoda are phylum that have a feeding structure called a lophophore; many phyla lack either (rotifera). Phylum Platyhelminthes

What kind of animals are in the Ecdysozoa group?

Ecdysozoa (/ ˌɛkdɪsoʊˈzoʊə /) is a group of protostome animals, including Arthropoda (insects, chelicerata, crustaceans, and myriapods), Nematoda, and several smaller phyla. They were first defined by Aguinaldo et al. in 1997, based mainly on phylogenetic trees constructed using 18S ribosomal RNA genes.

What are the characteristics of a Lophotrochozoan?

All Lophotrochozoans and Ecdysozoans share these characteristics: A diverse, ancient group, the most familiar of which are the Molluscs and the Annelids (segmented worms). (from the Greek trocho = “wheel”; zo = “animal”), at least primitively.