Organization of Life Phylogenetic relationship of animals.

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Presentation transcript:

Organization of Life

Phylogenetic relationship of animals

Classification of fishes

Kingdom: Animalia Phylum: Chordata Class: Chondrichthyes Subclass: Elasmobranchii (sharks, rays, ratfishes) 100 million years old (current species, ancient relatives up to million years old) 400 living species General Info - Sharks

Shark Diversity

Shark Anatomy

Body type dependent upon habitat Gray Reef Shark

Shark Jaws and Teeth

Shark Fins Constant speed Bursts of power

Shark “Skin” Dermal denticles a.k.a Placoid scales

Sensory organs Olfactory sacs on both sides of head – nares (nostrils) Can sense substances at 1 ppm Ampullae of Lorenzini – detect weak electrical fields Lateral line – detect vibrations in the water Canals that run along the head and body lined with sensory cells called neuromasts that sense vibration Can see pores on surface of body Inner ear

Ampullae of Lorinzini

Shark Senses

Lateral Line

Shark Reproduction Internal fertilization Males – claspers Females - cloaca pc.maricopa.edu

Shark Reproduction Oviparous – embryo enclosed in large, leathery egg case (mermaid’s purse); ~43% of cartilaginous fishes

Shark Reproduction Ovoviviparous – female retains eggs inside reproductive tract for additional protection. Give birth to live young. 300 embroys/1 whale shark Sandtiger sharks consume yolk and then eat brothers and sisters to survive. Viviparous – live young. Embryos absorb nutrients from the walls of mother’s reproductive tract.

Shark behavior We’ll hear that from you! apexpredators.com Photos: wikipedia.com