| Lethacotyle | |
|---|---|
|   | |
| Holotype of Lethacotyle fijiensis Manter & Prince, 1953 [1] | |
|  Scientific classification   | |
| Kingdom: | Animalia | 
| Phylum: | Platyhelminthes | 
| Class: | Monogenea | 
| Order: | Mazocraeidea | 
| Family: | Protomicrocotylidae | 
| Genus: |  Lethacotyle  Manter & Price, 1953  | 
| Species | |
Lethacotyle is a genus of polyopisthocotylean monogeneans, included in the family Protomicrocotylidae.
 The genus includes only two species:  Lethacotyle fijiensis Manter & Price, 1953 [2]  , the type-species of the genus, and  Lethacotyle vera  Justine, Rahmouni, Gey, Schoelinck, & Hoberg, 2013 . [1]  Both species are parasitic on the gills of jacks in the Pacific Ocean. [1]  [2]  [3]  [4]  They are known only from three localities: off Fiji, [2]  Andaman Islands, [3]  [4]  and New Caledonia. [1] 
 The genus Lethacotyle is special in that its members have no clamps on their posterior attachment organ or haptor, in contrast to most polyopisthocotylean Monogenean which have clamps. [5]  [6]  This is reflected in the etymology of the name, which, according to Manter & Price [2]  is "from letha = forgetting, and cotyle = cup, and refers to the absence of clamps".