Phylum chordata
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Phylum Chordata. A.K.A. Chordates. Four Distinguishing Features. Single, hollow, dorsal nerve cord Gill or pharyngeal slits (small openings along anterior part of body or pharynx) Notochord: flexible rod for support that lies between the nerve cord and gut

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Phylum Chordata

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Phylum chordata

Phylum Chordata

A.K.A. Chordates


Four distinguishing features

Four Distinguishing Features

  • Single, hollow, dorsal nerve cord

  • Gill or pharyngeal slits (small openings along anterior part of body or pharynx)

  • Notochord: flexible rod for support that lies between the nerve cord and gut

  • Post-anal tail: tail that extends beyond the anus


Chordate characteristics

Chordate characteristics

  • http://www.biog1105-1106.org/labs/deuts/chordates.html


Subphylum urochordata a k a tunicates

Subphylum UrochordataA.K.A. tunicates

SEA SQUIRTS

  • 3,000 species; all marine

  • Sessile

  • Filter feeders

  • Larval form has all four characteristics of chordates


Subphylum urochordata a k a tunicates1

Subphylum UrochordataA.K.A. tunicates

SALPS

  • Planktonic

  • Filter feeders

  • Warm water

http:[email protected]/165884673/


Subphylum cephalochordata a k a lancelets amphioxis

Subphylum CephalochordataA.K.A. Lancelets (amphioxis)

  • 23 species

  • 7 cm long, similar in shape to a fish

  • Retains chordate characteristics entire life

  • Invertebrate (lack a backbone)

  • Filter feeders; inhabit soft

    bottoms)


Subphylum vertebrata a k a vertebrates

Subphylum VertebrataA.K.A. Vertebrates

  • Have a backbone; usually made of bone

  • Bilateral symmetry

  • Endoskeleton

  • Complete digestive system

  • Closed circulatory system

    Include: fish, reptiles, birds and mammals


Types of fishes

Types of Fishes

1) Class Agnatha: Jawless fish

2) Class Chondrichthyes: cartilaginous fish

3) Class Osteichthyes: bony fish


Class agnatha a k a jawless fish

Class AgnathaA.k.a. Jawless fish

  • Lack jaws

  • Elongated like an eel

  • Lack paired fins

  • Lack scales

  • Mostly parasitic

    Examples: hagfish and lampreys


Lampreys

Lampreys


Hagfish

Hagfish


Hagfish1

Hagfish


Class chondrichthyes a k a cartilaginous fish

Class ChondrichthyesA.k.a. Cartilaginous Fish

  • Skeleton of cartilage

  • Movable jaws with teeth

  • Paired lateral fins for efficient swimming

  • Placoid scales: similar shape to teeth embedded into the skin

  • Spiracle and gill slits are not covered

    Includes: Sharks, Rays, Skates, and Ratfish


Class chondrichthyes

Class Chondrichthyes

  • Placoid scales; sandpaper-like


Class osteichthyes a k a bony fish

Class OsteichthyesA.k.a. Bony fish

  • Skeleton made of bone

  • Cycloid, ganoid or ctenoid scales which are thin flexible and overlapping

  • Scales are made of bone and covered by a thin layer of tissue and mucus

  • Operculum that covers and protects the gills

  • Swim bladder: fills with air to control buoyancy


Class osteichthyes

Class Osteichthyes

  • Gills covered by an operculum.


Class osteichthyes1

Class Osteichthyes

  • Have different scales than sharks:

Ctenoid

Cycloid

Ganoid


Fish adaptations

Fish Adaptations

  • You will work in pairs.

  • Each pair will have one sheet of paper and each person should have a different color pen.

  • Each person in the pair will answer every other question in their color pen.

  • Answer the following questions:

  • Part I: 1, 2, 3, 4, 5, 7 8, 10, 11, 12(read),14, 15, 16, 17 (your fish only)

  • PartII: 1, 2 a-c, 3, 5, 7

  • Part III: 1, 2, 3, 4, 6


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