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The nematode model species C. elegans, C. briggsae, and Pristionchus pacificus, among other species, exhibit androdioecy, [53] which is otherwise very rare among animals. The single genus Meloidogyne (root-knot nematodes) exhibits a range of reproductive modes, including sexual reproduction , facultative sexuality (in which most, but not all ...
Nematoida is a clade of pseudocoelomate free living or parasitic animals.It consists of phyla Nematoda and Nematomorpha. [3] [4] The two groups share a number of features in common; the presence of a cloaca in both sexes, aflagellate sperm, and a cuticle made of collagen.
Gnathostomata (/ ˌ n æ θ oʊ ˈ s t ɒ m ə t ə /; from Ancient Greek: γνάθος (gnathos) 'jaw' + στόμα (stoma) 'mouth') are the jawed vertebrates.Gnathostome diversity comprises roughly 60,000 species, which accounts for 99% of all living vertebrates, including humans.
Nematodes (Nematoda or roundworms) are a phylum of animals. The phylum is subdivided in 3 classes : Chromadorea, Enoplea and Secernentea. ... Nematode anatomy (1 C ...
It also has some of the same organ systems as larger animals. About one in a thousand individuals is male and the rest are hermaphrodites. [19] The basic anatomy of C. elegans includes a mouth, pharynx, intestine, gonad, and collagenous cuticle. Like all nematodes, they have neither a circulatory nor a respiratory system.
Enoplea (enopleans) is a class, which with the classes Secernentea [1] and Chromadorea make up the phylum Nematoda in current taxonomy. [2] [3] [4] The Enoplea are considered to be a more ancestral group than the Chromadorea, and researchers have referred to its members as the "ancestrally diverged nematodes", compared to the "more recently diverged nematodes" of Chromadorea.
For example, in George O. Poinar Jr's 1990 book on Nematodes and Biological Control, he describes Heterorhabditis, a genus of nematodes that harbors symbiotic bacteria that are highly pathogenic to hosts, but completely harmless to them. After the bacteria kill the host, they proliferate on the host's dead body.
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