DIOCTOPHYMATIDAE

Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, Zootaxa 4185 (1), pp. 1-274 : 18

Key to genera of larvae in the Family DIOCTOPHYMATIDAE

1 L3 encapsulated in fish hosts, mostly in hypaxial musculature; six inner labial papillae single and button-like, with central pore-like depression; outer six labial papillae twice as large as the inner, four of them single and two double. Male L3: mean 5.9 (range 4.1–7.4) long; width at oesophago-intestinal junction 0.15 (0.11–0.19). Female L3: 6.5 (5.1–8.6) long; width at oesophago-intestinal junction 0.18 (0.16–0.20); vulva just behind oesophago-intestinal valve. Intestinal region of live L3 red in colour.................................................................................... * Dioctophyme

- L3 and L4 encapsulated in fish hosts, on mesenteries; six inner labial papillae single with narrow bases and spike-like apices; four of six outer labial papillae single, two of them double, with broad bases and nipple-like apices. Outer labial papillae double. Male L3: 21.3 (12.0–29.7) long; width at oesophago-intestinal junction 0.22 (0.14–0.30). Female L3: 21.5 (11.5–34.8) long; width at oesophago-intestinal junction 0.21 (0.10–0.30). Male L4: 55.1 (32.2–66.0) long; width at oesophago-intestinal junction 0.35 (0.29–0.40). Female L4: 69.5 (45.1–83.4) long; width at oesophago-intestinal junction 0.42 (0.37–0.46); vulva just behind intestine-rectal junction. Live L3 white or pink in colour, live L4 bright red in colour........... * Eustrongylides