| exuviotrophic apostome ciliates from crustaceans of st. andrew bay, florida, and a description of gymnodinioides kozloffi n. sp. | gymnodinioides kozloffi n. sp. is described from the eelgrass broken-back shrimp hippolyte zostericola. the species is distinct from others in the apostome genus gymnodinioides in that the trophont ciliature has a small group of kinetosomes located to the right of kinety 9a, and kinety 1 and 2 are divided. other apostome morphologies are described from many decapod crustaceans from st. andrew bay, florida, including gymnodinioides inkystans, hyalophysa chattoni, and variants of both h. chattoni ... | 2004 | 15666721 |
| salinity tolerance in hyalophysa chattoni (ciliophora, apostomatida), a symbiont of the estuarine grass shrimp palaemonetes pugio. | the apostome ciliate hyalophysa chattoni, a symbiont of the estuarine grass shrimp palaemonetes pugio, was tested for its growth and reproductive ability in a wide range of salinities from 0.1 to 55 ppt. shrimp, with their attached ciliates, were slowly acclimated to different salinities in order to assess protozoan cell size and division. the trophont and tomont stages of the ciliate life cycle were analyzed. in both stages, cell size increased with salinity from 0.1 to 20 ppt. cell size levele ... | 2008 | 18394870 |
| prepalintomic metamorphosis in hyalophysa chattoni (ciliophora, apostomatida): cytoplasmic ultrastructure. | the transformation of cytoplasmic structures during prepalintomic development in the apostome ciliate hyalophysa chattoni was studied by transmission electron microscopy. the trophont's food mass was divided into large sectors in the swimming stages (i, ii), into globular masses in the cystic stages iii, iv, and finally into typical oblate pellets in stage v. the oral fiber was observed in stages i-iii and the rosette was observed in stages i, ii and reappeared after division (stage vi), indicat ... | 2011 | 23195464 |
| conjugation in hyalophysa chattoni bradbury (apostomatida): an adaptation to a symbiotic life cycle. | hyalophysa chattoni, borne as an encysted phoront on a crustacean's exoskeleton, metamorphoses to the trophont during the host's premolt. after the molt within 15min to 2h conjugants with food vacuoles appear in the exuvium, swimming along with the trophonts. starvation in other ciliates usually precedes conjugation, but food vacuoles in conjugants do not preclude starvation. only after ingestion and dehydration of vacuoles ceases, does digestion of exuvial fluid begin. conjugants resorb their f ... | 2013 | 23706651 |
| secretion of the reproductive cyst wall by the apostome ciliate hyalophysa chattoni. | the ultrastructure and cytochemistry of secretion of the reproductive cyst wall in the ciliate hyalophysa chattoni was analysed. the cyst wall is not secreted by exocytosis. its primary material is chitin, which is secreted rapidly (< 30 min) at the surface of the cell. transmission em and ultracytochemistry reveal that the process is similar to chitin secretion and polymerization in yeast, fungi, and arthropods. the trichocysts are few in the tomont stage and are not involved in encystment. | 1991 | 23194708 |
| the fine structure of secretion in hyalophysa chattoni: formation of the attachment peduncle and the chitinous phoretic cyst wall. | the settling tomite stage of the apostome hyalophysa chattoni secretes a phoretic cyst wall composed of chitin, mucopolysaccharides, and protein. within 1 1/2 h after settling, an electron-dense proteinaceous cyst layer (the outer layer) is formed from secretions originating at the base of the kineties and from the thick pellicular layer between the kineties. the inner cyst layer, composed primarily of chitin (acidic and neutral polysaccharides are also present), is secreted across the entire ce ... | 2007 | 1826931 |