Diagnosis: The genus is monotypic. Tegument smooth. Genital pore opening posterior to male copulatory organ (MCO). Genital atrium muscular. Vas deferens looping left intestinal caecum. MCO tubular, composed of 2 nested tubes; external tube twisted. Accessory piece absent. Prostatic reservoir simple. Accessory copulatory organ absent. Vaginal atrium muscular. Squamodiscs present, ventral, dorsal; anterior rows of rodlets with open rings. Accessory spines associated with the posterior region of the haptor. Peduncular spines [52]. Superficial root of ventral anchor reduced. Parasites of freshwater perciform fishes (Sciaenidae).
Type species: Spinomatrix penteormos Boeger, Fehlauer & Marques, 2006 from Pachyurus adspersus Steindachner.