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Morphology and ultrastructure of the gut inSpadella cephaloptera (chaetognatha)
Journal of Morphology, 1996Structural and ultrastructural studies on the gut of the chaetognath Spadella cephaloptera, as well as observations on the feeding behavior of specimens bred in the laboratory, were conducted. The gut displays four distinct zones: pharynx, esophagus, and intestine, to which are connected a pair of diverticula, and the rectum, differing in length, shape,
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Systematics of The Chaetognatha
1991Abstract In recent years the number of species, genera, and families within the Chaetognaths has exploded. In his revision of the phylum Ritter-Záhony (1911a) recognized 27 species in six genera. In his 1965a revision, Tokioka recognized 58 species in 15 genera.
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1984
Chaetognata (arrow worms) are a hermaphroditic phylum. The male reproductive tract, consisting of paired testes, vasa deferentia and seminal vesicles, is located in the caudal region of the body. Within the seminal vesicles of mature organisms, the filiform spermatozoa are packed into aggregates which are of the same size and shapaas the seminal ...
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Chaetognata (arrow worms) are a hermaphroditic phylum. The male reproductive tract, consisting of paired testes, vasa deferentia and seminal vesicles, is located in the caudal region of the body. Within the seminal vesicles of mature organisms, the filiform spermatozoa are packed into aggregates which are of the same size and shapaas the seminal ...
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The Chaetognatha of the Southern Ocean
1965The Chaetognatha are a widespread almost wholly planktonic group occurring, often in large numbers, in the open ocean. They are hermaphrodite but almost certainly not self fertilising animals and exhibit relatively little anatomical variation throughout the group.
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Hair-fan patterns in the Chaetognatha
Canadian Journal of Zoology, 1978Chaetognaths are important marine predators which rely on external sensory hairs to receive prey-produced vibrations, enabling them to recognize and locate their food. Hair-fan patterns are mapped for both larvae and adults of Sagitta hispida, Sagitta enflata, and Spadella schizoptera, for several sizes of Sagitta elegans, and for adults of Spadella ...
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Experimental Feeding of Some Medusae and Chaetognatha
Journal of the Fisheries Research Board of Canada, 1969The feeding behaviour of eight species of medusae was studied; total food consumed, rates of digestion, and growth rate were noted, especially in Cyanea and Aurelia.Aurelia up to 5 cm diam can accept a wide range of size of food organisms obtained by filtering sea water through the curtain of tentacles during pulsation, whereas most other species find ...
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