These photos are of Gonimochaete latitubus, a lagenidioid parasitoid of the nematode Rhabditis marina (bar in each figure = 10 µm). The newly released propagules (asexual; no sexual stage known) are zoospore-like, but they have no flagella and are immotile (aplanospores, photo 27). Eventually the aplanospores develop an adhesive protuberance at the narrow end (photo 28). If a nematode comes into contact with the protuberance, the spore sticks very tightly to the worm. The spore produces a penetration tube and enters the nematode's body cavity, where it produces a refractive infection structure (photo 29). From the infection structure, a sporangial thallus is produced, which eventually digests and replaces the nematode's insides (photos 30, 31). Mature thalli produce discharge tubes that extend out of the nematode carcass (photos 32 [discharge-tube bud], 33 [mature tubes]). The cytoplasm of the thalli flows into the tubes, leaving behind bubble-like structures at the sealed-off bases of the tubes (photos 33, 34). Aplanospores are released in bursts from the tips of discharge tubes, and if a tube tip is aerial (a common tendency), the spores gather in a ball, perhaps awaiting passage of a susceptible host. See Newell SY, R Cefalu, JW Fell. 1977. Myzocytium, Haptoglossa, and Gonimochaete (fungi) in littoral marine nematodes. Bull Mar Sci 27:177-207 [note that we now know that these are stramenopiles {or maybe some are plasmodiophoromycetes?!}, not fungi]; Beakes GW. 1998. Relationships between lower fungi and protozoa, p.351-373. In: Evolutionary Relationships Among Protozoa (eds, GH Coombs, K Vickerman, MA Sleigh, and A Warren). Chapman & Hall, London; Beakes GW and SL Glockling. 1998. Injection tube differentiation in gun cells of a Haptoglossa species which infects nematodes. Fungal Genet Biol 24:45-68.