Trypanorhych plerocercoids of Nybelinia surmenicola are described in the common squid, Todarodespacificus, through the use of light and scanning electron microscopy. Upon dissection, out of 200 common squid fromthe Korean coastal water, 54 (27%) were found infected with N. surmenicola plerocercoids. Mean N. surmenicolaabundance was 2.28 per squid. Body length and width ranged from 6.1-11.1 (8.05) × 2.0-2.2 (2.1) mm. Bothria arebroad, bean-shaped, measured 2.4-2.8 × 0.62-0.69 (2.65 × 0.64) mm. The short and long tentacular armatures whichare spirally arranged are homeoacanthous and homeomorphous uncinate hooks and consist of compact rose-thorn-shapedtentacular hooks. The tentacle sheaths are coiled in a spiral near the bulbs. Four large bothria are separated by filiformmicrotriches along the bothridal margins. This is the first description of the plerocercoids of N. surmenicola in thecommon of squid from the Korean coastal waters.