Lab Exam 2 Flashcards
Subphyum: Craniata
Order: Myxiniformes
Hagfish
- Terminal mouth surrounded by barbles
- no dorsal fins
- no paired fins
- diphycercal tail
- vestigial eyes
- mucus glands
Vertebrata (new usage)
Order: Petromyzontiformes
lamprey
- large, ventral, toothed funnel around mouth without barbels
- one or two dorsal fins
Class: Osteostraci
extinct
- Dorso-ventrally flattend
- head and anterior body covered by bony shield
- ventral mouth
- heterocrercal tail
Class: Anaspida
extinct
- covered by small bony plates
- terminal mouth
- hypocercal tail
Class: Heterostraci
extinct
- Bony shiled covering head and anterior body
- hypocercal tail
Superclass : Gnathostomata
Class: Placodermi
Order: Antiarchi
extinct
- Small ventral mouth
- very large pectoral fins
- heavily armored anteriorly
Superclass : Gnathostomata
Class: Placodermi
Order: Arthodira
extinct
- large terminal mouth
- small pectoral fins
- heavily armored anteriorly
Superclass Gnathostomata
Class: Chondrichthyes
Order: Cladoselachiformes
- Broad based immovable pectoral fins
- no claspers
- superficially homocercal tail
Superclass Gnathostomata
Class Chondrichthyes
Subclass Holocephali (fleshy operculum covering gills)
Order Chimaeriformes
Chimaeras
- large head
- large eyes
- elongate tail
- large spine anterior to first dorsal fin
- Cephalic “clasper”in males
- Claspers on Pelvics
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Order Xenacanthiformes
extinct
- elongate paired fins
- diphycercal tail
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Galeoomorpha
Order Heterodontiformes
Horn Sharks
- Dorsal fins with heavy spines
- anterior teeth pointed
- posterior teeth flattened
- fin spines
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Galeoomorpha
Order Carcharhiniformes
Requiem Sharks
- Dorsal fins spineless
- nicticting membrane below eye
- side teeth usually largest and seperated from front teeth by short gap
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Squalomorpha
Superorder Squalomorphi
Order Squaliformes
- spines anterior to dorsal fins
- body notdorso-ventrally flatterned
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Galeomorpha
Order Lamniformes
White Shark, Mako Shark
- dorsal fins spineless
- front teeth largest and separated from side teeth by toothless gap or series of smaller teeth
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Squalomorhpha
Superorder Squatinomorphi
Order Squatiniformes
- pectoral fins enlarged
- head and body dorso-ventrally flattened
- gill slits opening laterally
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Squalomorpha
Order Rhinobatiformes
Guitar fish
- tail relativly thick
- two dorsal fins
- caudal fin well developed
- spines on back and tail
- no sting
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Squalomorpha
Order Rajiformes
Skates
- Tail very thin
- two small dorsal fins
- caudal fin reduced or absent
- spines present or absent
- no sting
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elasmobranchii
Infraclass Squalomorpha
Order Myliobatiformes
Rays
- Tails usually very thin
- no caudal or dorsal fin (if caudal fin is present then tail relatively thick and dorsal fin)
- no spines
- elongate sting (midway down dorsum of tail present)
Superclass Gnathostomata
Class Chondrichthyes
Subclass Elastombranchii
Order Torpediniformes
electric rays
- tail relativly thick
- caudal fin well developed
- two dorsal fins
- no spines or sting
Superclass Gnathostomata
Class Acanthodii
extinct
Spiny Sharks
- Not armored
- small ganoid scales
- series of spiny projections along side
Superclass Gnathostomata
Class Osteichthyes
Subclass Sarcopterygii
Infraclass Coelacanthini
- all fins lobed except first dorsal
- unique three lobed tail
Superclass Gnathostomata
Class Osteichthyes
Subclass Sarcopterygii
Infraclass Dipnoi
Order Lepidosireniformes
lung fish
- paired fins filamentous
- diphycercal tail
Superclass Gnathostomata
Class Osteichthyes
Subclass Sarcopterygii
Infraclass Dipnoi
Order Osteiolepiformes
extinct
- heterocercal tail
- two dorsal fins
- paddle like paired fins (fleshy badal lobes)
- true internal nares
Superclass Gnathostomata
Class Osteichthyes
Subclass Actinopterygii
Order Polypteriformes
Bichirs
- Heavy ganoid scales
- numerous dorsal finlets
- diphycercal tail
- lobe at bases of paired fins
Superclass Gnathostomata
Class Osteichthyes
Subclass Actinopterygii
Order Acipenseriformes
Surgeons and paddle fish
- plankton feeders
- few large ganoid scales or scaleless
- heterocercal tail
- broad and flattened snout
Superclass Gnathostomata
Class Osteichthyes
Subclass Actinopterygii
Order Lepisosteiformes
gars
- long thoothed snout
- weakly heterocercal tail
- ganoid scales
Superclass Gnathostomata
Class Osteichthyes
Subclass Actinopterygii
Order Amiiformes
bowfins
- blunt snout
- weakly heterocercal tail
- cycloid scales
- single elongate dorsal fin extending to caudal fin