Onychognathiidae is a family of
worm
Worms are many different distantly related bilateral animals that typically have a long cylindrical tube-like body, no limbs, and no eyes (though not always).
Worms vary in size from microscopic to over in length for marine polychaete wor ...
s belonging to the order
Bursovaginoidea
Bursovaginoidea is one of the two orders in the phylum Gnathostomulida.
Appearance and anatomy
Bursovaginoids are rather small, ranging from a half of a millimeter to a full millimeter in length. Many species in the order Bursovaginoidea have ...
.
Genera:
* ''
Goannagnathia''
Sterrer, 2001
* ''
Nanognathia''
Sterrer, 1972
* ''
Onychognathia''
Riedl, 1971
* ''
Valvognathia''
Kristensen & Nørrevang, 1978
* ''
Vampyrognathia''
Sterrer, 1998
References
{{Taxonbar, from=Q2321403
Gnathostomulida
Platyzoa families