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Strange but true

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Strange but true Sea Cucumber Echinoderms (like starfish, sea urchins, sand dollars) Radially symmetrical Have a water-vascular system that functions as hydraulic ... – PowerPoint PPT presentation

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Title: Strange but true


1
Strange but true
2
Sea Cucumber
  • Echinoderms (like starfish, sea urchins, sand
    dollars)
  • Radially symmetrical
  • Have a water-vascular system that functions as
    hydraulic muscles
  • Eat decaying matter that floats in the water or
    is in the sand

3
  • The biggest sea cucumber, the tiger's tail sea
    cucumber, is about 2 m long

4
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5
Star fish and Brittle stars
  • These marine invertebrates move very slowly along
    the sea bed.
  • There are over 2,000 different species of brittle
    stars

6
  • Brittle stars are mainly detrivores they eat
    decaying matter and plankton.
  • Some brittle stars can also kill small animals.
    They push their stomach out through their mouth
    with 5 teeth (located on the underside) and
    digest the prey (there is no anus).
  • Sea stars are carnivores. They eat clams,
    oysters, coral, fish, and other animals.

7
Sea horsesand sea dragons?
  • coronet nearly as unique as a human thumbprint
  • dorsal fin moves fish forward
  • pectoral fins control turning and steering
  • eyes each eye moves independently

8
  • reproduction male becomes pregnant when a female
    deposits her eggs into his pouch pregnancy lasts
    about two to three weeks once the male gives
    birth, he usually becomes pregnant again right
    away
  • diet consume up to 3,000 brine shrimp each day
    have no teeth and swallow food whole
  • species about 35
  • size from 1/4 inch to a foot or more
  • range temperate and tropical coastal waters

9
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10
Life is hard for the seahorse!!
  • Natural predators, such as crab, tuna, skates,
    and rays
  • Storms are the biggest natural cause of death for
    adult seahorses (tear them from their holdfasts,
    to be cast ashore or die of exhaustion).
  • Seahorses are sought after for
  • Chinese medicine Aquariums Souvenirs

11
Sea Dragons!
12
Dragons!
  • Close relatives of sea horses.
  • Larger bodies and leaf-like appendages (can hide
    among floating seaweed or kelp beds).
  • Feed on larval fishes and amphipods (mysids -
    "sea lice").

13
Nudibranchs
14
Nudibranch fun facts
  • Also known as sea slugs
  • Mollusks
  • 3000 species
  • Essentially snails without shells
  • Name means "naked gill"
  • Benthic organisms (live on the ocean bottom)
  • Grazing carnivores
  • Simultaneous hermaphrodites (possess both male
    and female sex organs at the same time)
  • Very bright colors may be warning to predators
    that they are toxic!

15
Giant swimming nudibranch
16
Giant Clam
  • Mollusk
  • Bivalve (2 shells)
  • Southern Western Pacific
  • and Indian Oceans
  • Diet plankton and nutrients
  • produced by symbiotic algae
  • The algae also gives part of its colour

17
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18
Sea Anemones
19
Sea Anemones look like plants, but
are actually animals!
  • Invertebrates (no skeleton)
  • Coelenterates
  • Live attached to firm objects in the seas (sea
    floor, rock, or coral), but they can slide around
    very slowly.
  • Carnivorous
  • Mutualism Clown fish always live near anemones
    they are immune from (and protected by) the
    stinging tentacles. The clown fish help the
    anemone by cleaning the tentacles (as the fish
    eat detritus) and perhaps by scaring away
    predators.

20
Sponges
21
  • Sessile (cant move)
  • Radial or no symmetry.
  • Suspension feeders.
  • Drive water through systems of canals/chambers,
    capturing small particles of food and ingesting
    them.
  • No tissues (simplest multicellular animal)

22
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23
Strange But TrueIn Class Assignment
  • Create a chart like the one below on white paper
    and complete

Name of Marine Creature 2-3 Interesting Facts
Sea Cucumber
Star Fish
Brittle Star
Sea Horse
Sea Dragon
Nudibranch
Giant Clam
Sea Anenome
Sponge
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