Featured Microscopist: Spike (M.I.) Walker

Freshwater Hydra

Freshwater hydra

A male large brown freshwater hydra (Pelmatohydra oligactilis) is captured spreading its tentacles in search of prey. This species has a solid stalk and particularly long tentacles. Note the profusion of testes and the large number of ectocommensal ciliate protozoa (Trichodina pediculus) which were gliding over its surface to give it a 'fuzzy' outline. Illumination was enhanced with Rheinberg contrast filters. The photomicrograph was taken with Zeiss Tessovar zoom macro equipment coupled to a Bowen Illumitran transparency copier utilized as a flash light source, in conjunction with a 2" aspheric condenser. (4.5x)

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