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DEUTEROSTOMES

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Title: PowerPoint Presentation Author: Brenda Last modified by: bferguson Created Date: 1/1/1601 12:00:00 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: DEUTEROSTOMES


1
DEUTEROSTOMES
  • Pattern of Development Radial
  • Indeterminate Cleavage
  • Blastopore ?Anus

2
PHYLUM ECHINODERMATA
  • Spiny Skin

3
Echinoderm Characteristics
  • Larva bilateral symmetry, cilia, free-swimming
  • Adults pentaradial symmetry
  • WATER VASCULAR SYSTEM
  • Feeding
  • Gas exchange
  • Hydrostatic skeleton

4
Water vascular system
  • Madreporite
  • Stone, ring, radial, lateral canals
  • Ampullae
  • Tube feet

5
  • Endoskeleton of calcium carbonate
  • Pedicellariae
  • Prominent digestive system
  • Separate sexes external fertilization
  • Simple nervous system no brain
  • No excretory organs

6
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7
Examples of Echinoderms
8
Feeding
  • Sea stars feed on bivalves
  • Sea Urchins
  • Feed on algae, kelp, etc.
  • Brittle Stars
  • Feed on plankton, detritus

9
Regeneration
  • Echinoderms can regenerate lost parts
  • Sea cucumbers others use this for defense

10
PHYLUM CHORDATA
11
Main Characteristics
  • Notochord
  • Dorsal, tubular nerve cord
  • Pharangeal gill slits
  • Larva or embryos have postanal tail
  • Endostyle or thyroid gland

12
Invertebrate Chordates
  • Urochordata
  • Tunicates
  • Larva typical chordates
  • Cephalochordata
  • Lancelets

13
Subphylum Vertebrata
  • Vertebral column, Backbone
  • Develops around notochord, usu. replaces it
  • Cranium
  • Endoskeleton made of living tissue
  • Neural crest cells
  • Pronounced cephalization

14
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15
  • Closed circulatory system
  • Endocrine glands
  • Use muscles for feeding
  • Most have 2 pairs of appendages

16
Intro to Fishes
  • 6 different classes of fish
  • Specialized sense organs
  • Lateral line
  • Ampullae of Lorenzini

17
Agnatha Jawless Fish
  • 2 classes
  • No paired fins
  • Lack scales? smooth skin
  • Cartilaginous skeleton and notochord
  • Uncovered gills

18
Class Chondricthyes
  • Cartilaginous fish
  • Paired fins and jaws
  • Uncovered gills
  • Placoid scales
  • Oily liver
  • Reproduction
  • Some are oviparous
  • Some ovovivparous
  • Few viviparous

19
Osteichthyes Bony Fishes
  • Flexible, paired fins
  • Overlapping bony scales
  • Operculum
  • Oviparous with external fertilization
  • Diverged into 2 major groups

20
  • Ray-finned Fishes
  • (Class Actinopterygii)
  • Fins supported by rays of bone or cartilage
  • Gave rise to modern bony fish
  • Lobed-Finned Fishes
  • (Class Sarcopterygii)
  • Flexible fins with jointed bones and muscles
  • Lungfish Coelacanths

21
Characteristics of Modern Bony Fishes
  • Have swim bladder
  • Developed from primitive lungs
  • Functions in buoyancy
  • Operculum
  • Bony scales
  • External Fertilization Development

22
The rediscovery of the Coelacanth
23
Lungfish are believed to have given rise to
tetrapods
  • Supported by mitochondrial DNA evidence
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