Spraguea Sprague & Vávra 1976

Dimorphic, monokaryotic and diplokaryotic, the monokaryotic phase preceding the diplokaryotic phase but both occurring in the same cell, the type species infects neurones of cranial and spinal ganglia of Lophius piscatorius, L. budegassa and L. americanus (Pisces, Lophiidae), infection limited to the distal region of the ganglion cell body, where two concentric regions are seen corresponding to two completely different merogonic and sporogonic sequences; the outer zone zone harbours stages that are monokaryotic, sporogony is polysporoblastic with a sporogonial plasmodium dividing into uninucleate sporoblasts, spores, 4.2 x 2.5 µm, are ovoid and uninucleate with a thin spore wall, lamellar polaroplast, isofilar polar tube with 5 or 6 coils and a posterior vacuole; the inner zone harbours stages that are diplokaryotic, sporogony is disporoblastic, the sporont producing 2 diplokaryotic sporoblasts, sSpores, 3.7 x 1.4 µm, are cylindrical, slightly curved and diplokaryotic, with thin spore wall and polar tube with 3 or 4 coils; type species S. lophii (Doflein, 1898) Weissenberg, 1976 .