Results 171 to 180 of about 3,601 (206)
Some of the next articles are maybe not open access.
Photoreception in Chaetognatha
1984Chaetognaths have a pair of eyes below the epidermis on the dorsal surface of the head; an inverted type in the genus Sagitta and an everted type in the genus Eukrohnia. The inverted type is composed of capsule cells surrounding the external surface, one pigment cell at the center of the eye, photoreceptor cells extending distal processes into ...
T. Goto, M. Yoshida
openaire +1 more source
Nervous System in Chaetognatha
1987The nervous system of chaetognatha consists of 6 ganglia in the head region, one ventral ganglion in the body, nerves connecting these ganglia and peripheral nerves passing out of these ganglia. The ganglia in the head region are the cerebral ganglion, a pair of vestibular ganglia, a pair of oesophageal ganglia, and a suboesophageal ganglion.
T. Goto, M. Yoshida
openaire +1 more source
Distribution Patterns In Chaetognatha
1991Abstract Chaetognatha are holoplanktonic animals, except for the genera Spadella, Bathyspadella and Krohnittella. They are found in all oceans and seas, from coast to coast and from the surface to the bottom; they have even invaded estuarine habitats.
A C Pierrot-Bults, V R Nair
openaire +1 more source
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 ...
openaire +1 more source
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 ...
openaire +1 more source
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.
openaire +1 more source
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 ...
openaire +1 more source
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 ...
openaire +1 more source
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.
openaire +1 more source