Haycocknema perplexum n. g., n. sp (Nematoda : Robertdollfusidae): an intramyofibre parasite in man

Haycocknema perplexum n. g., n. sp. (Nematoda: Robertdollfusidae) is descri bed from a man in Tasmania, Australia. Adult male and female nematodes and larvae were recovered from myofibres following biopsy of the right vastus l ateralis muscle and were associated with a polymyositis. H. perplexum is di stinguished from all other genera of the Muspiceoidea by the presence of a large amorphous "cell" supporting a granule-filled, flask- or gourd-shaped reservoir in the rectal region of mature and gravid female nematodes, often containing one or more large, refractile, thick-rimmed "globules" on the e xternal surface of the reservoir, by the small number of ova/eggs/larvae de veloping in each uterus, by the minute, weakly-sclerotised, almost tubular spicule, by the presence of a pair of ampulla-shaped glands posteriorly and by the presence of lateral bacillary bands comprised of a single row of po re cells spaced irregularly and extending posteriorly to the region of the vulva in immature females.