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Phylogeny of Fishes
• Phylogeny– Classification based on common ancestry– Kingdom Animalia, Phylum Chordata
Phylogeny of Fishes
• Phylogeny– Classification based on common ancestry– Kingdom Animalia, Phylum Chordata
• Classes– Open www.FishBase.org, section Tools, select Classification Tree– Open www.FishBase.org, select Quick Identification: discuss
Classes, click through to Families
• Fishes in Time– Open FishBase, FishBase Book, Nomenclature, The Orders
Table: discuss common ancestry, show relation to tetrapods, show poster and table (next slides)
Phylogeny of fishes
Classes Common ancestor(million
y)
Orders(n)
Families(n)
Genera(n)
Species(n, %)
Myxini (hagfishes) 600 1 1 6 78 0.2
Cephalaspidomorphi (lampreys)[Petromyzontida]
450 1 3 10 47 0.1
Holocephali (chimaeras)[Chondrichthyes]
420 1 3 6 50 0.1
Elasmobranchii (sharks and rays)[Chondrichthyes]
420 12 51 188 1,158 3.5
Sarcopterygii (lobe-finned fishes)
420 3 4 4 8 0.04
Actinopterygii (ray-finned fishes)
400 46 487 4,833 31,608 95.9
Total 64 549 5,047 32,949 100
FishBase 11/2014http://www.fishbase.org/tools/Classification/ClassificationTree.php
Remarkable Fishes
Discuss: phylogeny, distribution, size, prey and predators, reproduction, growth, brain size, other traits.Myxine glutinosa
Latimeria chalumnae
Rhincodon typus
Engraulis ringens
Mola mola
Need To Know
• Based on common ancestry, the 33,000 known species of fishes are classified into 6 Classes, about 60 Orders and about 500 Families.
• All fishes and tetrapods had a common ancestor about 600 million years ago; tetrapods (about 27,000 species) split off from lobe-finned fishes about 400 million years ago.
• Know the Classes of fishes and their main characteristics
Phylogeny of Fishes
• Exercise– Select and explore some remarkable fishes
based on information in FishBase – Present your findings