|700 × model of Gelyella monardi|
Huys, 1988 
Rouch & Lescher-Moutoué, 1977 
Rouch & Lescher-Moutoué, 1977
Gelyella is a genus of freshwater copepods which are "surrounded by mystery". They live in groundwater in karstic areas of southern France and western Switzerland. The two species are the only members of the family Gelyellidae and, although previously placed in the order Harpacticoida, a new order, Gelyelloida, was erected for this family alone.
Gelyella shows some paedomorphosis, in which animals reach sexual maturity while still partly resembling juveniles. The adults are 300–400 micrometres (0.012–0.016 in) long with a nearly cylindrical body that tapers towards the rear. There are eleven body segments, the last of which is the length of the previous two segments combined.
It is thought that the two species may have begun to diverge from a marine common ancestor following the changes in coastline during the Miocene. During the Miocene, the Mediterranean Sea reached parts of Switzerland, but this was followed by the Messinian salinity crisis, in which the sea almost dried up, leaving salt lakes in the Mediterranean Basin.
- "Gelyelloida Huys, 1988". Integrated Taxonomic Information System. Retrieved October 28, 2011.
- "Gelyellidae Rouch & Lescher-Moutoué, 1977". Integrated Taxonomic Information System. Retrieved October 28, 2011.
- T. Chad Walter (2009). T. Chad Walter & Geoff Boxshall, ed. "Gelyella Rouch & Lescher-Moutoue, 1977". World Copepoda database. World Register of Marine Species. Retrieved March 8, 2010.
- Diana M. P. Galassi (2001). "Groundwater copepods: diversity patterns over ecological and evolutionary scales". In R. M. Lopes, J. W. Reid & C. E. F. Rocha. Copepoda: Developments in Ecology, Biology and Systematics. Hydrobiologia 453/454. pp. 227–253. doi:10.1023/A:1013100924948.
- Rony Huys (1988). "Gelyelloida, a new order of stygobiont copepods from European karstic systems". In G. A. Boxshall & H. K. Schminke. Biology of Copepods. Hydrobiologia 167/168. pp. 485–495. doi:10.1007/BF00026343.
- Pascal Moeschler & Raymond Rouch (1988). "Découverte d'un nouveau représentant de la famille des Gelyellidae (Copepoda, Harpacticoida) dans les eaux souterraines de Suisse". Crustaceana. 55 (1): 1–16. JSTOR 20104370. doi:10.1163/156854088X00203.