Chapter 10 Flashcards
What waters do osteriophysans dominate?
continental fresh waters of the world (3 out of 5 spp) represented on every major land mass except greenland and antarctica
are all members of osteriophysi fw fresh?
almost all, except gonorhynchiforms and 3 catfish famdams
5 major groups of osteriophysi
gonorhynchiformes cypriniformes characiformes siluriformes gymnotiformes
characteristics of a cyprinid
protrusable premax, no adipose fin. Weberian apparatus
what percentage of canadian fresh water fish are the cyprinids?
~22%
What percentage of canada’s fw fishes are suckers?
~9%
characteristics of characiformes
innovations in feeding stuctures, like jaw teeth, or tooth replacements like shark teeth. adipose fins are usually present.
characteristics of siluriformes
10% of all fishes are catfishes! all members have barbels, usually have a single fake barbed spine, locking pectoral fins for defense
what is the only north american catfish family?
Ictalurids
Gymnotifores:
knifefishes. including electric eel. Central/south america ELECTROGENIC AND ELECTROSENSORY STRUCTURES. UNLIKE OTHER OSTARIOPHYSANS, GMNOTIDS HAVE NO SCHRECKSTOFF OR ASSOCIATED FRIGHT RESPONSE. no dorsal or adipose fin
what is an ‘outstanding feature of gymnotoid biology, observed in all species’?
the capacity to produce and detect weak electric fields which they use in object location and communication by detectinb changes in the shape, amplitude or frequency of the electric fields
how much electricity do electric eels emit?
600 volts
what type of air breathers are electric eels?
obligate. (you could drown one)
Osteriophysi are linked by what?
shreckstoff, weberian apparatus
what is the weberian apparatus
modification of the anteriormost 4-5 vertebrae, containing bony parts called ossicles, that connect the swimbladder to the inner ear for sound transmission.
