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Week 2: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes
3 classes of vertebrates = jawless, cartilaginous, bony
Class Chondrichthyes = “cartilaginous fishes” cartilage only Class Osteichthyes = “bony fishes” cartilage and bone Week 3 Week 4... Jawed Vertebrates
Class Lamprey = “jawless fishes” Week 2 Jawless Vertebrates vertebrae skeleton cartilage no bone no jaws no paired fins
Lamprey ~40 species
Class Lamprey freshwater & marine
fossil lamprey 450 MYA MIGRATORY FW SW/FW (anadromy)
Adult =reproductive stage lamprey oral disk with teeth and tongue (keratin)
brook lamprey sea lamprey not all lamprey feed as adults...
Lamprey Life Cycle ammocoete larva to adult “ammocoetes”
Ammocoete Larva =non-reproductive stage filter feeder
Larval =non-reproductive feeding stage ~1/2 m Adult =reproductive non-feeding stage
reproductive adults ready to spawn
adults build gravel nests in freshwater streams
mating egg-laying = oviparity external fertilization death = semelparity
Lamprey Life Cycle ammocoete larva to adult “ammocoetes”
M = metamorphosis Life History Strategy #1
feeding phase Life History Strategy #2 M2 M1 M = metamorphosis
Feeding Adult Migration downstream out to sea (lake) ~3 ft ~40 lbs/fish fluid/yr.
B = birth R = reproduction G = growth Migratory strategies
non-feeding adult feeding adult larger more eggs iteroparous
oral disk digestive tract Development
predator vs. parasite
Species Interactions Species 1 Species 2 PREDATION Predator-Prey + – Parasite-Host +– Parasitoid-Host +– COMPETITION – – MUTUALISM ++ COMMENSALISM + 0
east coast native fish
New Hampshire 12 th Annual Lamprey Appreciation Day Saturday, June, 2010 Amoskeag Fishways Dam Merrimack River Manchester 1700s “Derryfield Beef”
I. Jawless Fish: -there are 2 types -both are parasites Unit 8 The Fishes.
Chordates All vertebrates are chordates but not all chordates are vertebrates. –Examples of non-vertebrates are sea squirts and lancelets –Characteristics.
Fish Notes Class:Agnatha Jawless Fish. General Fish Information Fish make up half of all vertebrates on Earth. Fish make up half of all vertebrates on.
CHAPTER 34 VERTEBRATE EVOLUTION AND DIVERSITY Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Section C: Jawless Vertebrates.
Vertebrate Zoology Agnatha Hagfish & Lamprey Agnatha Hagfish & Lamprey.
Jawless Fishes. Review of Chordates (fig. 7.51) Table 7.1 dorsal hollow nerve cord notochord (dorsal, elastic supporting rod) paired pharyngeal gill slits.
1. What is a fish? Aquatic vertebrates that have paired fins, scales, and gills. Of course there are exceptions There are approx. 24,000 living species.
Jawless Fish Phylum: Chordata Sub-Phylum: Vertebrata Class: Agnatha There are two primary marine types of the class Agnatha. They are Hagfish and Lampreys.
Lecture 3 - Friday, August 29, Finish lampreys and fossil forms of jawless fishes 2. Evolution of jaws and paired fins 3. Other Fossil Fishes.
Fish. Vertebrates (Subphylum Vertebrata) –Backbone enclosing a nerve cord, or spinal cord Phylum Chordata –Notochord –Pharyngeal pouches –Postanal tail.
Fishes Lesson 4. -Aquatic vertebrates (they have backbones) -Most have paired fins, scales on some parts of the body, and gills. -Fins are for movement.
Superclass Agnatha Classes Myxini and Cephalaspidomorphi about 84 species lack a jaw paired fins no scales relationships among agnathans is uncertain.
The Vertebrates. Vertebrate Characteristics Vertebrae (backbone) Notochord (flexible dorsal rod) Nerve cord (hollow) with brain Three layers of.
Jawless Fish Phylum: Chordata Sub-Phylum: Vertebrata Class: Agnatha.
Part 3 “Fishes” – an introduction. “Fishes” Vertebrata.
( Petromyzon marinus ) Ms. Sneha Singh Department of Zoology, DAVCG, Yamunanagar.
Phylum Chordata. What Is A Chordate? 4 characteristics present at some stage of life 1.A dorsal, hollow nerve cord (called spinal cord in vertebrates)
Class Agnatha Specimen:Lamprey. Lampreys are jawless fish, the adult of which is characterized by a toothed, funnel-like sucking mouth. Parasitic lampreys.
02 Sept. 2014Fishes.ppt1 FISHES. 02 Sept. 2014Fishes.ppt2 Fishes All fishes retain four (4) primitive characters: Streamlined body Vertical tail fin Gills.
Fig I. I.Fishes – Overview Oldest group of vertebrates (530 mya) 27,000+ species (15,600+ marine spp.) Four major groups Agnatha (Jawless fishes)
Sea Lampreys Sea lampreys are members of an ancient family of jawless fishes that were around before the dinosaurs.
Vertebrates: Part I Fishes & Amphibians. Phylum Chordata Chordates: includes all the vertebrates Have 3 common characteristics: –Nerve Cord: hollow tube.
Fish. Definition of a Fish They are aquatic vertebrates that have paired fins, scales and gills.
Our first focus…FISH In your own words, describe what makes a fish a fish.
End Show Slide 1 of 62 Copyright Pearson Prentice Hall Biology.
Unit 11 Marine Vertebrates Pages 5-66 to : Characteristics of Phylum Chordata and sub-Phylum Vertebrata: pharyngeal (gill) slits vertebrae.
Tunicates “Tail Cords” – over 2,000 species Adults sessile Free swimming larvae; only larvae have a 4 defining characteristics.
FISHIES Classes: Agnatha, Chondrichthyes, and Osteichthyes.
Fish Classification Kingdom Animalia Phylum Chordata Class Agnatha ( Jawless Fish) Class Chondrichthyes (Cartilaginous Fish) Class Osteichthyes ( Bony.
Phylum Chordata The phylum Chordata includes fish, amphibians, reptiles, birds, mammals and a few invertebrate classes. They are placed in this phylum.
Marine Fish. Intro to Fish Fish – The most common and diverse vertebrates in the ocean – Evolved around 500 million years ago – 20,000 different species.
Wake-up 1.Explain the difference between a vertebrate and invertebrate. 1.What are some characteristics of fish? 1.What are the three groups of fish?
Vertebrates. Vertebrate Characteristics Endoskeleton Vertebrae Integument Gills & Lungs _____________ circulatory system Digestive Tract _____________.
Marine Fishes Phylum Chordata Subphylum Vertebrata.
Chapter 18 Fishes. Characteristics Phylum: Craniata (describes the skull that surrounds their brain Much evolution occurred in freshwater Much evolution.
Class Agnatha Chordata Hagfish & Lamprey Chordata Hagfish & Lamprey.
The Deuterostomes Origin of vertebrates And the evolution of “fish”
MSC Biology of Fishes at NEAq. Week 3: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes.
FISH FACTS. PHYLUM CHORDATA Dorsal Notochord-long rod that supports the body- becomes the vertebrae in most. Dorsal Notochord-long rod that supports the.
Chordates. A chordate is an animal that has, for at least some stage of its life, a dorsal, hollow nerve cord; a notochord; pharyngeal pouches; and a.
Marine Fishes Read Chapter 9 Pages Chordates All chordates have (at least during some period of their life) –Dorsal nerve cord –Gill slits.
Jawless Fishes (Agnatha) The most primitive of all living fish are the jawless fish (Agnatha) As they lack jaws, jawless fish must feed by suction with.
Fishes Ch More than 2/3 of the Earth’s surface is water No matter where there is water, there is some sort of fish living in the water.
Fish Classification Domain: Eukarya Kingdom Animalia Phylum Chordata Class Agnatha ( Jawless Fish) Class Chondrichthyes (Cartilaginous Fish) Class Osteichthyes.
PHYLUM CHORDATA Dorsal Notochord-long rod that supports the body- becomes the vertebrae in most. Dorsal Nerve cord-becomes the central nervous system.
Fish or Fishes? Multiple individuals of one species are fish. Multiple individuals of more than one species are fishes.
Marine Fishes Marine Fishes Marine Biology Unit #4.
Chordates. A chordate (Phylum Chordata) is an animal that has, for at least some stage of its life, a dorsal, hollow nerve cord; a notochord; pharyngeal.
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