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Definition of Chaetognatha in English: Chaetognathaplural noun ˌkiːtəɡˈnaθəˌkiːtəɡˈneɪθəkēˈtäɡnəTHə Zoology A small phylum of marine invertebrates that comprises the arrow worms. Example sentencesExamples - Also unresolved are the phylogenetic positions of Cycloneuralia, Chaetognatha, Gnathostomulida, Cycliophora, and Micrognathozoa.
- Also absent are the Chaetognatha (arrow-worms), which have been considered the basalmost branch of the Deuterostomia in the past, but are currently regarded by many as basal protostomes.
- Nielsen and Nielsen et al. come to generally comparable results, although sometimes the additional taxa Rotifera, Acanthocephala and Chaetognatha were included in Aschelminthes.
- Pelagic species were from the Chaetognatha, Cnidaria, Crustacea, Ctenophora, and Mollusca, and benthic species were from the Chordata, Crustacea, Mollusca, and Echinodermata.
- Instead, Rouse's conclusion that ‘groups such as the Arthropoda, Brachiopoda, Chaetognatha, Ectoprocta, Gastrotricha, Phoronida may have lost a prototroch’ is totally gratuitous, and remains unaddressed by his own data.
Derivatives noun ˈkiːtəɡnaθ Zoology On the other hand, one species of parasitic nematode can reach 13 meters in length - it parasitizes the sperm whale - and adult nematomorphs, chaetognaths, and some priapulids are also visible to the naked eye. Example sentencesExamples - Perversely, they failed to include any sequences from rotifers, gnathostomulids, chaetognaths, or, in fact, anything that might actually be comparable to Acanthocephala.
- Thus, characters shared by chaetognaths and chordates are only those shared by all triploblastic metazoans and resolution of affinities depends upon adopting a preferred hypothesis of relationship.
- Into the early 1990s most researchers and evidence suggested that the deuterostomes were composed of chordates, hemichordates, echinoderms, chaetognaths, and lophophorates.
- In the cnidarians, chaetognaths, and ctenophores, the opaque gut wall was the surface measured.
Origin Modern Latin (plural), from Greek khaitē 'long hair' + gnathos 'jaw'. Definition of Chaetognatha in US English: Chaetognathaplural nounkēˈtäɡnəTHə Zoology A small phylum of marine invertebrates that comprises the arrow worms. Example sentencesExamples - Also unresolved are the phylogenetic positions of Cycloneuralia, Chaetognatha, Gnathostomulida, Cycliophora, and Micrognathozoa.
- Instead, Rouse's conclusion that ‘groups such as the Arthropoda, Brachiopoda, Chaetognatha, Ectoprocta, Gastrotricha, Phoronida may have lost a prototroch’ is totally gratuitous, and remains unaddressed by his own data.
- Pelagic species were from the Chaetognatha, Cnidaria, Crustacea, Ctenophora, and Mollusca, and benthic species were from the Chordata, Crustacea, Mollusca, and Echinodermata.
- Nielsen and Nielsen et al. come to generally comparable results, although sometimes the additional taxa Rotifera, Acanthocephala and Chaetognatha were included in Aschelminthes.
- Also absent are the Chaetognatha (arrow-worms), which have been considered the basalmost branch of the Deuterostomia in the past, but are currently regarded by many as basal protostomes.
Origin Modern Latin (plural), from Greek khaitē ‘long hair’ + gnathos ‘jaw’. |