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Orthonectida (/ˌɔːrθəˈnɛktɪdə, -θoʊ-/) is a
small phylum of
poorly known parasites of
marine invertebrates that are
among the
simplest of multi-cellular...
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Nectonematoida Hoplonemertea Palaeonemertea Pilidiophora Onychophora Orthonectida Polyplacotomia Uniplacotomia Cestoda (tapeworms and relatives) Monogenea...
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relate mesozoa to a
group including annelids,
planarians and nemerteans.
Orthonectida have a very
reduced muscular and
nervous system, only
consisting of a...
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phylum Mesozoa was
divided into two
phyla (
Orthonectida and Rhombozoa) when it was
discovered the
Orthonectida are
probably deuterostomes and the Rhombozoa...
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subkingdom of
three small phyla of
simple animals without organs, Placozoa,
Orthonectida, and Rhombozoa. They are
known as "simple"
though they have differentiated...
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Phylum Gnathostomulida Phylum Rotifera Mesozoa Phylum Dicyemida Phylum Orthonectida Rouphozoa Phylum Gastrotricha Phylum Platyhelminthes Superphylum Lophotrochozoa...
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phylogenomic methods support monophyly of
enigmatic 'Mesozoa' (Dicyemida +
Orthonectida, Lophotrochozoa)".
Proceedings of the
Royal Society B:
Biological Sciences...
- Antennacanthopodia, Antennipatus, Helenodora, Succinipatopsis, and Tertiapatus.
Orthonectida contains no
classes or orders, but is
split into two families; Pelmatosphaeridae...
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Phylum Rhombozoa Order Dicyemida Order Heterocyemida Phylum Orthonectida Order Orthonectida Phylum Cnidaria class Anthozoa Order Actiniaria Order Alcyonacea...
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mesozoan group Orthonectida as the
sister group to Pleistoannelida. However, a more
recent 2022
analysis found a
monophyletic Orthonectida+Dicyemida clade...
