- Internal[edit]. Below is a consensus evolutionary tree of Chaetognatha, based on both morphological and molecular data, as of 2021.[3].
- Chaetognatha (arrow worms) are a small phylum of predatory animals, all of which are marine, including 130 extant species in the class Sagittoidea.
- A systematic compilation of valid Chaetognatha species diversity and distribution collated from published literature has been undertaken in this chapter.
- History of Phylum Chaetognatha: 1. Slabber, in the year 1769, was the first worker to record Sagitta and he placed it in the order Intestina under phylum Vermis.
- Chaetognatha Species Count: According to the online database The Catalogue of Life there are 132 recognized species of Arrow Worms.
- Invertebrates in the Plankton: Chaetognatha. Chaetognaths are a dominant part of the plankton, outnumbered only by copepods.
- arrowworm, any member of a group of free-living wormlike marine carnivores that belong to the invertebrate phylum Chaetognatha.
- Chaetognatha. In: GBIF Backbone Taxonomy. 291,349 occurrences. ... Chaetognatha Felder, 1874. Common names. Pilorme in Danish.
- Philo Chaetognatha - Importance. Given its ecological importance, theChaetognatha phylumit is surprisingly little known.
