Further observations onCalliacanthaLeadbeater (Choanoflagellata), with special reference toC. simplexsp. nov. from many parts of the world

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Abstract
C. simplex is a new species with an unusually wide geographical range, occurring at sea temperatures as varied as 0.degree. C under ice at Point Barrow [Alaska, USA.] or -1.degree. C in arctic Canada, to 22.degree. C on the equator at the Galapagos Islands. The morphology and range of variation are illustrated by light microscopy, transmission electron microscopy and scanning electron microscopy applied to dry whole mounts prepared in situ from freshly-gathered wild material. Among the diagnostic structural features is the position of the anterior transverse costa which is located unusually far back in comparison with other members of the genus; it is within and not outside the ring of 4 longitudinal costae building up the lorica chamber, although this feature can only be ascertained by scanning. The differences between this species and C. natans (type species of the genus) are greater and involve more characters than was previously recognized. Possible functional implications are discussed.

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