Onychophora
Definition
Noun: 1. A phylum of small, soft-bodied, worm-like invertebrates: Onychophora are terrestrial animals found in moist, dark habitats, primarily in tropical and subtropical regions. They are considered a distinct phylum, separate from both arthropods and annelids, and are often described as having characteristics of both groups.
Usage
- The term "Onychophora" is used scientifically as the formal name for the phylum. The common name for its members is "velvet worms."
- It is typically used in biological, zoological, and paleontological contexts.
- The study of Onychophora provides key insights into the evolution of arthropods.
- Fossil evidence suggests that Onychophora were once marine organisms.
Examples
- Onychophora capture their prey by shooting a sticky slime from specialized appendages on their heads.
Advanced Usage
- Phylogenetic significance: In evolutionary biology, Onychophora are frequently discussed as a potential "sister group" to arthropods, holding an important position in understanding the development of segmented bodies and jointed limbs.
- The phylogenetic placement of Onychophora is crucial for reconstructing the tree of life for protostome animals.
Variants and Related Words
- Onychophoran (noun): An individual animal belonging to the phylum Onychophora; a velvet worm.
- The onychophoran moved slowly across the damp log.
- Velvet worm (noun): The common name for any onychophoran, referring to their soft, velvety appearance.
Synonyms
- Velvet worms (common name)
Notes on Meaning
The primary and essentially only meaning of "Onychophora" is as the scientific name for a specific phylum of invertebrates. Its significance lies in its unique anatomical and evolutionary position, possessing traits such as a soft, unsegmented body like an annelid (segmented worm) and paired, claw-tipped legs like an arthropod.
Noun
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enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids
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