Laxus oneistus

Pröts, Philipp, Novotny-Diermayr, Veronica & Ott, Jörg A., 2024, A novel three-part pharynx and its parallel evolution within symbiotic marine nematodes (Desmodoroidea, Stilbonematinae), Organisms Diversity & Evolution 24 (3), pp. 353-373 : 357

Laxus oneistus

The corpus has a vase-like shape and is about two to three times as long as wide, tapering gradually over a longer distance towards the anterior end. It is conspicuously large compared to the corpus of species in other genera and constitutes around 45–52% of the pharynx length ( Table 1). The myofilaments are only slightly directed forward and the anterior-most end and nearly perfectly perpendicular until 2/3 of the corpus length. From this point on, they are oriented slightly backwards. The density of myofilaments and intensity of the F-actin signal were equal in both corpus and the succeeding isthmus. Basally situated nuclei are positioned in between myofilaments in the corpus ( Figs. 1j, 4h, 5n and 7h).