Reproduction: the details vary extensively. Movements of gases from the blood to the swim bladder increases buoyancy and the animal rises, transfer of gas back to the blood makes the animal sink. Movement: Fishes control their buoyancy with an air sac known as a swim bladder. Water is drawn into the mouth, though the pharynx, and out between the gills by movement of the operculum and contraction of muscles surrounding the gill chambers. Life of the Osteichthyes Breathing: most fishes breathe by drawing water over 5 pairs of gills, located in chambers, covered by a protective bony flap called the operculum. Three pairs of tooth-bearing dermal bones lining the jaws (dentary, premaxillary and maxillary) Can breathe through lungs or vascularized swim bladders or through their skin, intestines or stomach. Dermal fin rays made up by lepidotrichiae (modified, tile-shaped scales) Some bony fish are hermaphrodites.
Info for Osteichthyes (bony fishes) Characteristics of the clade: Endochondral ('spongy') bone in the endoskeleton Ectothermic (cold blooded) = their body temperature is dependent on that of the water.
The group has bilateral symmetry The phylum of Osteichthyes is Chordata (either vertebrates or one of several closely related invertebrates) Domain Eukaryota ->Kingdom Animalia ->Phylum Chordata Amphibians are the most closely related group The Phylum Chordata (vertebrates) dates 530.000.000 years ago and humans (from 200.000 years ago) originate from it. More than 29,000 species Have bony (ossified), as opposed to cartilaginous, skeleton =endoskeleton with a hard matrix of calcium phosphate. Osteichthyes (bony fishes) Osteichthyes is a taxonomic group of fish which means bony fish the name was coined long before the advent of phylogenetic systematics.
Bony and cartilaginous fishes are clades of the different types of vertebrates: Osteichthyes (bony fishes) - Clades: Ray Finned Fishes (Actinopterygii) and Lobe-Fins (Sarcopterygii and Dipnoi) Gnathostomes (jawed vertebrates) Clade: Chondrichthyes (cartilaginous fishes) *Note: Both bony and cartilaginous fishes share the 4 derived characteristics of their common phylum: Chordata, which are: the notochord (dorsal stiffening rod) a hollow dorsal nerve cord pharyngeal gills a post anal tail that includes the notochord and nerve cord. Fish (bony and cartilaginous) By Lilly Beyleri, Boris Konstantinov and Veli Mincheva 10/8īony and cartilaginous fishes Vertebrates are classified based on traditional interpretations of gross anatomical and physiological traits.