Scanning electron microscopy of the penetration of newborn mouse skin by Strongyloides ratti and Ancylostoma caninum larvae.

The scanning electron microscopical appearances of infective larvae of Strongyloides ratti and Ancylostoma caninum have been described. Particularly noteworthy was the tail of S. ratti which was found to have a distal aperture surrounded by a row of eight projections. The penetration of larvae through newborn mouse skin was investigated. S. ratti larvae forced its way rapidly and directly through the stratum corneum. No larvae of A. caninum were observed in stages of partial penetration but the occasional empty sheath was seen.

Morphology of Ancylostoma buckleyi Le Roux and Biocca, 1957 in dogs from Cairns, North Queensland, Australia.

Ancylostoma buckleyi was found in dogs in Cairns, North Queensland, Australia. Worms were small, whitish, males 10.25-10.89 mm in length; females 12.65-14.96 mm in length. The buccal capsule was funnel shaped. There were three pairs of ventral teeth and two pairs of dorso-lateral teeth. Spicules were simple and equal, 0.71-0.73 mm in length. Gubernaculum was shaped like a cricket bat, the widest part in the posterior half. The bursa was well developed, the ratio between posterolateral-mediolateral to mediolateral-externolateral was 1:1. The inner branches of the dorsal rays were partially fused. Tail of the femaleworm was 0.22-0.23 mm in length and conical.

Ancylostoma malayanum, Alessandrini, 1905 in Thailand.

Ancylostoma malayanum was recorded from a Malayan Sunbear, Helarctos malayanus, in Nakorn Sri Thammarat Province, Southern Thailand. Comparison of the body measurements recorded by various authors were presented. The morphological features were described and illustrated, including the anogenital papillae.

Comparative morphology of genital cones of genus Ancylostoma Dubini, 1843.

Male worms of Ancylostoma braziliense, A. ceylanicum, A. kusimaense, A. malayanum, A. duodenale, A. caninum, A. tubaeforme, Agriostomum vryburgi and Cyclodontostomum purvisi have the external appendages beside the anogenital aperture. These anogenital structures are morphologically similar and are assumed to be homologous among the species with three pairs of teeth or more. In hookworms with two pairs of teeth, the anogenital structures are complex. Anogenital features can be used as a taxonomic character in separating the species.