BIO 121 Lecture Notes - Lecture 19: Reedfish, Deep Sea, Actinistia
10 Dec 2020
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But have bony, mineralized teeth and some parts of skeleton have mineralized granules large liver, containing oil. Helps buoyancy (bony fish use a different structure) But animal will sink if it stops moving. Unclear how or whether sharks actually sleep. Some sharks gulp air from surface into stomach, use as air bladder. Rays use special muscles to do this. Sharks need to keep moving to keep water flowing into mouth and over gills. Tiny organs down the length of the body surface for sensing changes in water. Used to detect sound waves and water movements pressure. 20-25000 species vast majority are ray-finned species (1/2 of al vertebrate species) Found in almost all types of aquatic habitats. Contains two other classes: chondrostei and neopterygii. Chondrostein (52 species) consists of: sturgeons, paddlefish, reedfish, and bichirs. Neopterygii has 2 infraclasses holostei and teleostei . Holostei has bowfin (1 species) and gars (7 species) Infraclass teleostei contains all other bony fish teleosts.
