Microscopic Aquatic Animals #clarity #aquatic #Rotifers #underwater #underwaterworld #microscope

Rotifers are microscopic aquatic animals known for their wheel-like ciliated structures, which they use for locomotion and feeding. Tetrasiphon hydrocora is characterized by a fusiform (spindle-shaped), illoricate (lacking a hard shell) body without a distinct constriction between the head and abdomen. The species has a short, two-jointed foot with two long, slender toes. Its corona is oblique and weakly ciliated, primarily serving to convey food to the mouth rather than for propulsion.

Notably, the lateral antennae are positioned near the base of the foot and are long, knobbed, and adorned with excessively long setae, while the dorsal antenna is double and very long. The ovary is elongated, slender, and ribbon-like, and auricles are absent. The mastax (a unique chewing organ in rotifers) is an aberrant form of the virgate type, featuring large, dome-shaped rami and imperfectly developed mallei. The retrocerebral organ is well developed, and the eyespot is located at the posterior end of the ganglion.

This species was first described by Christian Gottfried Ehrenberg in 1840.
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