Abstract
Light microscope observations were made of the developmental morphology, life cycle, and host range of a strain of Haliphthoros milfordensis Vishniac isolated from the pink shrimp, Penaeus duorarum. Zoospores of the isolate, by virtue of their variation in shape and subapically attached flagella, are not as described previously for this genus. However, they are biflagellate and therefore characteristically oomycetous. Encystment of spores begins with flagellar retraction and rounding-up and terminates with the formation of an external, spined cyst wall. Germination is monopolar, producing germ tubes of various dimensions which fan out into hyphae. Vegetative growth is accompanied by multibranching at right angles and fragmentation. Sporogenesis is holocarpic but unusual in that thallus conversion into spores occurs in delimited segments non-simultaneously and in that spore cleavage is sequential, beginning in the sporangium and ending in the discharge tube. Infectivity tests indicate that H. milfordensis is a facultative parasite occurring on several crustacean hosts: however, the site of infection varies according to host structure.
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