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The Diversity of Fishes:An IntroductionLecture 2– August 26
Muddiest Point
WHAT ISN’T EVOLUTION?Evolution doesn’t work in a straight line, it lacks direction
Muddiest Point
Muddiest Point
Phylogenetic definitionAll chordates are fish; however, for this class, we will limit the scope of “fish”to occupy aphylogenetic position from cephalochordates(lancelets) up to amphibians.
Fish Trees
Fish Trees
Fish Trees
Fish TreesCraniata
Fish EvolutionFishes have been around for nearly500 million years (predating manby almost this entire period and allother vertebrates by nearly 100million years)The vertebrate bauplan evolved from our aquatic fishancestorsBody arrangement/jaws/limbsVertebrate eye/visionInternal fertilization/intrauterine nourishmentViviparityBig brains
The vertebrate bauplan evolved from our aquatic fishancestorsBody arrangement/jaws/limbsVertebrate eye/visionInternal fertilization/intrauterine nourishment/placentaViviparityBig brainsRespiration – How do fish breath?Embrace your inner fish
The Diversity of Fishes32,000 valid living species515 families62 orders108 jawless fish spp. (70 hagfish, 38 lamprey)970 cartilaginous fish spp. (403 sharks, 534 skates, 33chimeras)30,000 + bony fishes
Habitat of Fishes70% of the Earth’s surface is covered in waterFishes are found in all aquatic habitatsThermal hypersaline springs 104° F (40° C)Soda Lake Cichlid – Tilapia spp.Antarctic Waters <0° FCaves/ground waterAnoxic swampsMudHydrothermal ventsHigh elevation (5km above sea level)Deepest ocean (8km – 5 miles down)Abyssobrotula galatheaefound in the Puerto Rican Trench
Habitat of Fishes

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Term
Fall
Professor
Chakrabarty
Tags
Evolution, Ichthyology, Fishes, Muddiest Point, Body Forms

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