Females: In lateral view Gns without well pronounced genital swelling. More characters can be accessed by backtracking the key: Page 723
Males: Rostral plate not narrowed at its base. Left P5 with distalsegment shorter than 1/3 length of penultimate segment. More characters can be accessed by backtracking the key: Page 1161
Kingdom Animalia Phylum Crustacea Class Maxillopoda Subclass Copepoda Order Calanoida Family Phaennidae Genus Onchocalanus Species Onchocalanus trigoniceps
