Lipid and glycogen reserves were found to decrease when the adult Trichuris globulosa was to starve by incubation in vitro. Changes in acylglycerols (AG), non-csterified fatty acids (ΝΕΡΆ), cholesterol (Choi), phospholipids (PL) and glycogen were observed. Λ marginal depletion in phospholipids was observed while NEFA, AG, Choi and glycogen were rapidly depleted. Neutral glycolipids (cerebrosidcs) showed no significant change. The adult Trichuris globulosa was able to oxidize absorbed U- C-glucose, (Na)-l-t4C-acetate and (Na)-l-l4C-palmitate to CO2.
A new nematode species, Pseudocapillaria yucatanensis sp. n., is described from the intestine of the freshwater pimelodid catfish Rhamdia guatemalensis (Günther) from cenotes (= sinkholes) in Yucatan, Mexico. It differs from other three related species parasitizing freshwater fishes mainly in possessing the spicule with a simple rim of its proximal end and a non-expanded distal end, in the length of the spicule (0.218-0.295 mm), and the size (0.050-0.060 x 0.025-0.030 mm), shape and structure of eggs, and also in the host types and geographical distribution. Pseudocapillaria yucatanensis is the first known autochtonous species of Pseudocapillaria parasitizing freshwater fishes in Mexico.