[ZOO 2090] - Final Exam Guide - Everything you need to know! (36 pages long)

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2090
• Professor: Jinzhong Fu

Document Summary

Gas exchange takes across tissues of pharyngeal bars. Chromatophores: located in dermis or epidermis depending on vertebrate. Placoid scales: small hooked structures found only in cartilaginous fishes. Dermally derived scales include: ganoid scales: only in bichirs and gars, rhomboidal and opaque, enamel like coating, cycloid scales: thin, transparent and smooth, ctenoid scales: similar to cycloid but have comb like projections on the distal margin. Both cycloid and ctenoid lack enamel like coating found on ganoid scales. cycloid and ctenoid scales are sometimes grouped together and called elasmoid scales. Made up of 2 systems: the blood vascular and lymphatic system. Lampreys have no stomach because diet is so simple they absorb nutrients through large intestine. Sharks have gill rakers that prevent food from entering gills. Holobranch: interbrachial septum with gill lamellae on both ant. Holobranch in fish: brachial arch that carries 2 rows of respiratory filaments. 1 on ant surface and 1 on post.