protostome
Sign in to saveProtostomia () is the clade of animals once thought to be characterized by the creature's blastopore becoming its mouth during embryonic development. This nature has since been discovered to be extremely variable among Protostomia's members, although the reverse is typically true of its sister clade, Deuterostomia. Well-known examples of protostomes are arthropods, molluscs, annelids, flatworms and nematodes. They are also called schizocoelomates since schizocoely typically occurs in them.
AI overview
Protostomes are a major group of animals that includes arthropods, mollusks, worms, and other invertebrates, originally defined by how their embryos develop but now known to vary considerably in that trait. Understanding protostomes matters because they represent one of the two main branches of complex animal life and help scientists organize how different animal groups are related to each other.
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5 sectionsContents
- Protostomy
- Evolution
- See also
- References
- External links
Protostomia () is the clade of animals once thought to be characterized by the creature's blastopore becoming its mouth during embryonic development. This nature has since been discovered to be extremely variable among Protostomia's members, although the reverse is typically true of its sister clade, Deuterostomia. Well-known examples of protostomes are arthropods, molluscs, annelids, flatworms and nematodes. They are also called schizocoelomates since schizocoely typically occurs in them.
Together with the Deuterostomia and Xenacoelomorpha, these form the clade Bilateria, animals with bilateral symmetry, anteroposterior axis and three germ layers.