Discovery of the fish host of the ‘planktonic’ caligid Caligus undulatus Shen & Li, 1959 (Crustacea: Copepoda: Siphonostomatoida)

Specimens of Caligus undulatus found on the Japanese sardinella Sardinella zunasi collected in the Seto Inland Sea, Japan. Scales in μm.

a: Chalimus IV male (ventral view, before fixation), with the frontal filament indicated by an arrowhead.

b: Frontal filament of chalimus IV male; extension lobes of copepodid to chalimus IV stages numbered.

c: Ovigerous adult female (dorsal view, after fixation in 99% ethanol), with the frontal filament and egg strings indicated by an arrowhead and arrows, respectively.

Part of: Ohtsuka S, Nawata M, Nishida Y, Nitta M, Hirano K, Adachi K, Kondo Y, Venmathi Maran BA, Suárez-Morales E (2020) Discovery of the fish host of the ‘planktonic’ caligid Caligus undulatus Shen & Li, 1959 (Crustacea: Copepoda: Siphonostomatoida). Biodiversity Data Journal 8: e52271. https://doi.org/10.3897/BDJ.8.e52271