Topic 28: Clade Osteichthyans

Question 1

Osteichthyans

Answer 1

Includes bony fish and tetrapods, nearly all have ossified endoskeleton.

Question 2

Shared Derived Traits

Answer 2

Lungs, Operculum, Maneuverable Fins

Question 3

Swim Bladder

Answer 3

An air sac, evolved from a simple lung, that maintains the neutral buoyancy of fish by adjusting its inflation through gas exchange. Buoyancy no gas exchange.

Question 4

Characteristics of Bony Fish

Answer 4

Ossified endoskeleton, lateral line system, bony scales, external fertilization

Question 5

Ray-Finned Fish

Answer 5

Fins supported by long, flexible rays, >99%.

Question 6

Lobe-Finned Fish

Answer 6

Fleshy, muscular pectoral and pelvic fins w/ bony elements, Lobed Fins

Question 7

Coelacanths

Answer 7

Lobe-finned fish that swim and walk in shallow water.

Question 8

Lungfish

Answer 8

Lobe-finned fish that gas exchange via gills and lungs

Question 9

Operculum

Answer 9

A plate of dermal bone that covers and protects the gills