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The nematodes (/ ˈ n ɛ m ə t oʊ d z / NEM-ə-tohdz or NEEM-; Ancient Greek: Νηματώδη; Latin: Nematoda), roundworms or eelworms constitute the phylum Nematoda. Species in the phylum inhabit a broad range of environments. Most species are free-living, feeding on microorganisms, but many are parasitic.
An example of this would be marsupial and placental mammals. Scientists have also hypothesized that hermaphrodite asexual reproduction, or "selfing", could have evolved convergently by studying species similar to C. elegans [ 30 ] Other studies on the sex determination evolution suggest that genes involving sperm evolve at the faster rate than ...
Caenorhabditis elegans - genome sequenced in 1998 by Washington University in St. Louis and the Wellcome Trust Sanger Institute to 6x coverage [9] This is currently the most studied species in the genus, and likely in the phylum. C. elegans are mostly XX protandrous hermaphrodites that fertilize using their own sperm or the sperm of occasional ...
List of Nematoda has 25,000 recorded species from the Nematode phylum. There are estimated to be a million. [1]
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Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of about 1300 known species. [2] [3] Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies.
Reproduction takes place in succulent, rapidly growing tissues or in storage organs and continues throughout. [13] A female can lay 200–500 eggs in her lifespan. [12] However, if conditions are unfavorable, the nematodes can halt their lifecycle. [13] The lifespan of stem and bulb nematodes is about 70 days. [14]
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.