Upload
harvey
View
57
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Part 3. “Fishes” – an introduction. “Fishes”. Vertebrata. Figure 24.2. Vertebrata. “Fishes”. Fish Diversity. ca . 25,000 described species. 482 families with living representatives. Smallest < 1cm. Largest > 12m. Smallest < 1cm. Largest > 12m. Deepest. 8,370m (27,455 feet) . - PowerPoint PPT Presentation
Citation preview
Part 3“Fishes” – an introduction
“Fishes”
Vertebrata
Figure 24.2Vertebrata
“Fishes”
Fish Diversityca. 25,000 described
species
482 families with living representatives
Largest > 12m
Smallest < 1cm
Largest > 12m
Smallest < 1cm
8,370m (27,455 feet) Deepest
Abyssobrotula galatheae
Highest5,200m (17,000 feet)
Hottest
Coldest
up to 43.8° C (110.8°F)
-1.86° C (28.6°F)
Cyprinodon pachycephalus
Hypersaline
Cyprinodon variegatus
Up to 3x sea water
Torrential water
Colorado River Fishes
Trogloglanis pattersoni
Satan eurystomus
Caves
Anoxic water
Airbreathing
Diet
Reproduction
Life Spansseveral weeks
150+ years
Primitive and early fishes
Living jawless fishes = “agnatha”
Jawless Fishes (living)
Jawless Fishes (living)
Class Myxini
Hagfishes
We’re craniates, but not vertebrates
*distinct head, *tripartite brain *paired specialized sense organs *1 pair semicircular canals *glomerular kidney
*2 pairs semicircular canals*vertebrae
Craniate
Vertebrate
Habitat – Life History
Hagfishes at home
Slime glands and slime
Hagfish Eggs
Physiology very ‘invertebrate-like’
Human interactions
Hagfish fishery
Eel Skin
Vertebrata
Vertebrates
Vertebrata
at least 2 semicircular canals
vertebrae
fancy, vertebrate physiology
Lampreys are vertebrates
Class CephalaspidomorphiLampreys
LampreysWe have vertebrae
2 families
6 genera
41 species
Lampreys
Class Cephalaspidomorphi
Lampetra tridentata
Local Diversity
Lampetra similis
Lampetra ayresi
Lampetra richardsoni
California Diversity (freshwater)
Predaceous lampreys
Brook lampreys
Predaceous or parasitic life mode
Predaceous lampreys
Brook lampreys
Lampreys nesting
Ammocoete
Lamprey ammocoete larva
Cephalochordate (amphioxus)
Craniate Origin?
Ammocoete
AmphioxusNiche + anatomy
Biodiversity and ConservationLampreys have an image problem
Great Lakes
and sea lampreys
Most Jawless fishes are fossil only
All sorts of fossil jawless fishes
Mineralized bone
Hagfishes and lampreys (living)
Fossil things – “Ostracoderms” and conodonts
†Condodonta
Earliest vertebrate ? (with bone)
†Condodonta
†Condodonta
earliest bone
†”Ostracoderms”
Fossil jawless fishes were more sophisticated that the surviving ones
Hagfishes and lampreys (living)
Fossil things
*Smallish
*Bony armor
*Internal cartilaginous skeleton
† “Ostracoderms”
*Mostly benthic
† “Ostracoderms” - niche
†”Ostracoderms” – 2 major radiations
More primitive
More advanced
Primitive ostracoderms
Advanced ostracoderms
Jawed vertebrates derive from “ostracoderms”
More advanced
on to creatures with jaws….
Jawed vertebrates
Early gnathostomes