Spinitectus acipenseri Choudhury & Dick, 1992 from Acipenser fulvescens of Canada. (A) Oesophageal part of male body, lateral view; (B, C) anterior end of male, lateral and ventral views, respectively; (D–F) cephalic end of male, lateral, apical and dorsoventral views, respectively; (G) mouth, apical view; (H) shape of spines at second transverse row, lateral view; (I) region of vulva, lateral view; (J, K) posterior end of male, ventral and lateral views, respectively; (L) tail of female, lateral view; (M, N) distal tips of left and right spicule, respectively, lateral views; (O) right spicule, lateral view; (P) mature egg.