Bursovaginoidea
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Phylum:Gnathostomulida
Order:Bursovaginoidea
| Bursovaginoidea | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Gnathostomulida |
| Order: | Bursovaginoidea |
| Suborders | |
|
Also see text | |
Bursovaginoidea is one of the two orders in the phylum Gnathostomulida.[1]
Bursovaginoids are rather small, ranging from a half of a millimeter to a full millimeter in length.[2] Many species in the order Bursovaginoidea have a narrow neck, making their head stand out more than other bursovagionoids and all filospermoids.[3]
Bursovaginoids, unlike filospermoids, have paired sensory organs and a penis.[4] Also, all species in Bursovaginoidea have a sperm-storage organ called a bursa. In suborder Scleroperalia, the bursa is cuticular, while in Conophoralia it is not. Species in order Conophoralia tend to have larger sperm than those in Sceloperalia.[2]
