Anatomy Lecture 2

Anatomy Lecture 2 - Lecture 2 Anatomy and characteristics...

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Lecture 2 – Anatomy and characteristics of fishes Overview of overall anatomy General overhead - Body regions - Fins - Skeleton (cranium, jaws) axial skeleton- protects body organs appendicular skeleton – helps in movement
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Characteristics of fishes Jawless fishes, jawed cartilagenous fishes, jawed bony fishes 1. Jawless fishes (Agnatha) Lampreys and hagfish Cartilagenous notochord Both have no paired fins but have fin folds and caudal fin Fin folds rod-like supports Lack scales Single median nostril Cloaca (common cavity into which the anus and urogenital pore enter)
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Hagfishes (overhead) scavengers barbels around mouth and nostril mouth has horny plates with rows of triangular shaped teeth blind but with tiny light sensitive organs row of slime glands down flank 1-16 gill slits 5 hearts –1 to head, 1 to gills, 1 to viscera, 2 to notochord
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Lampreys (overhead) Parasitic or non-feeding
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Anatomy Lecture 2 - Lecture 2 Anatomy and characteristics...

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