ichthyology final families/orders

fishes final

Conodonts

oldest potential fish, eel like

Ostracoderms

shell skinned, first fishes (DEAD end)

Placoderms

Plate skinned, head bony plate (DEAD end)

Acanthodians

spiny sharks, Chondrichthyes arose from this class

Acanthodii

Sister group of bony fishes, Hagfish and Lamprey

Chondrichthyes

Cartilaginous skeleton, Devonian sharks and Jurassic Stingrays

Sacropterygii

Lobe finned fishes, little diversity

Actinopterygii

Ray-finned fishes, ganoid scales, gave rise to sturgeon/paddlefish/birchirs

Dead end devonian species

Placodermi, Ostracoderms, conodonts

Devonian species that gave rise

1. Acanthodians (Spiny Sharks) → Chondrichthyes (Sharks & Rays)

2. Sarcopterygii (Lobe-finned) → Tetrapods & Mammals

3. Osteichthyes (Early Bony Fishes) → Actinopterygii (Ray-finned)

What family in Perciformes exhibits a high degree and a diversity of different types of parental care?

Cichlidae

Rajiformes

Skates and Rays

Myxini

Jawless / eel like (Hagfish

Evolution of ray-finned fishes (Actinopterygii)

• reduction in bone numbers

• modified dorsal fins

• brachistegal rays

Does the order Cypriniformes exhibit Shreckstoff?

YES

Purpose of the Ampullae of Lorenzini?

electroreception

Deep ocean order of fishes, included Oarfish and Opah

Lampriforms

Which order has many species of smaller, mostly freshwater fishes with vivpary or oviparous

Cyprinodontiformes

Lophiiformes

Modified dorsal fin (angle fish)