By Ian Sinclair
Характеризует 750 видов южноафриканских птиц, включая не только резидентные и размножающиеся, но и большинство мигрантов. Фотографии, многие их которых демонстрируют птиц в полете, иллюстрируют разнообразие форм и раскрасок.
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Extra info for A Photographic Guide to Birds of Southern Africa
The thread of p-mastigophores mayor may not have spines. Included in this category are amastigophores, whose small terminal thread Cnidae 27 may break off and remain inside the capsule after discharge. In b-mastigophores (= basitrichs; b-rhabdoids), the uneverted shaft lies straight within the capsule and tapers into the thread, which always bears spines and usually coils evenly around the shaft. 2 Functions The adhesive functions of spirocysts and the tube-building role of ptychocysts have already been mentioned.
Pantin (1965) comments further on the paucity of sensory structures in cnidarians; it may not be coincidental that some of their receptors ultrastructurally appear to be capable of detecting multiple sensory modalities. 4 SENSORY RECEPTORS Most of the microscopical sensory structures in anemones incorporate a cilium or several cilia. As the sensory modalities to which they respond are not known with certainty, their putative functions are inferred by structural analogy with known mechano- and chemoreceptors in the vertebrates.
In some anemones the sphincter consists of muscle cells embedded within the mesoglea. , 1987). 2) facilitate release of the basal disc during locomotion (Batham and Pantin, 1951). Because of the incomplete partitioning of the coelenteron, all coelenteric fluid compartments are interconnected, so that in addition to its local effect, a contracting muscle will affect more distal areas by displacing some of this fluid. Thus, Batham and Pan tin (l950a) pointed out that 'the movement of any muscle affects the mechanical conditions under which operates every other muscle of the body.