Class Chondrichthyes PDF
Document Details
Uploaded by Deleted User
Tags
Summary
This document is a study guide about the Class Chondrichthyes, which includes jawed fishes such as sharks, rays, skates, and chimaeras. It covers topics like learning objectives, classification, form and function, movement, communication, electroreception, circulation, and reproduction.
Full Transcript
CLASS CHONDRICHTHYES GARCIA GIMAGAN FAUNT ZOOLOGY LEARNING OBJECTIVES By the end of this lesson, students will be able to: Recognize Key Features Explain Physical Adaptations Identify Defense and Movement Understand Communication and Senses Describe Circulation...
CLASS CHONDRICHTHYES GARCIA GIMAGAN FAUNT ZOOLOGY LEARNING OBJECTIVES By the end of this lesson, students will be able to: Recognize Key Features Explain Physical Adaptations Identify Defense and Movement Understand Communication and Senses Describe Circulation and Gas Exchange Outline Nutrition and Digestion Discuss Reproductive Strategies Class Chondrichthyes includes jawed fishes known as cartilaginous fishes Members: Sharks, rays, skates, and chimaeras. CLASS CHONDRICHTHYES CLASSIFICATION Elasmobranchii includes sharks and rays (batoids). Holocephali Includes chimaeras (ghost sharks), with around 40 living species. FORM AND FUNCTION Structure: Cartilaginous skeleton: flexible and lightweight. Streamlined body for efficient swimming. FORM AND FUNCTION Physiology: Powerful jaws with replaceable teeth. Five to seven pairs of gills for respiration. PROTECTION AND SUPPORT Defense Mechanisms: Tough, tooth-like placoid scales for protection. Some species produce electric shocks or have venomous spines. PROTECTION AND SUPPORT Survival Structures: Cartilaginous skeleton offers flexibility and strength. Heterocercal tail enhances propulsion and maneuverability. MOVEMENT Form of Movement: Utilize fins and heterocercal tail to swim. MOVEMENT Mechanism: Continuous swimming to maintain buoyancy (lack swim bladders). Movement aids in hunting and avoiding sinking. COMMUNICATION Methods of Communication: Body language: changes in posture. Electrical signals (in some species) and sound production. Lateral line system: detects vibrations for social interactions and hunting. ELECTRORECEPTION FOR HUNTING AND NAVIGATING (AMPULLAE OF LORENZINI) Ampullae is a small pores found mainly around the head and snout. Function: Detect weak electrical fields in the water to help locate prey. Navigation: These electroreceptors may also aid in long-distance navigation. CIRCULATION AND GAS EXCHANGE Circulation System: Two-chambered heart (one atrium, one ventricle). CIRCULATION AND GAS EXCHANGE Gas Exchange: Gills extract oxygen from water. Continuous swimming ensures water flow over gills. NUTRITION AND DIGESTION Feeding Habits: Mostly carnivorous: prey on fish, crustaceans, and mollusks. Some filter feed on plankton. Digestive Process: System includes mouth, pharynx, stomach, intestines, and cloaca. Cloaca serves multiple functions (excretion and reproduction in females). REPRODUCTION Mating Practices: Reproduction methods: oviparous (egg- laying) or ovoviviparous (egg-carrying) or viviparous (live-bearing). Internal fertilization with complex mating behaviors (courtship displays). WHITETIP REEF SHARK MATING NURSE SHARK MATING MATING BITE MAKRS/SCARS zoology THANK YOU REFERENCES https://www.vedantu.com/neet/chondrichthyes https://www.pw.live/exams/neet/chondrichthyes/ https://byjus.com/neet/chondrichthyes/ https://www.britannica.com/animal/chondrichthia n https://nhpbs.org/kn/vs/scilab6fa4g.asp https://quizlet.com/236148727/lesson-51- chondrichthyes-vocabulary-diagram/
