North Keppel Island · 2019. 4. 4. · Limpets • Phylum Mollusca • Class Gastropoda •...
Transcript of North Keppel Island · 2019. 4. 4. · Limpets • Phylum Mollusca • Class Gastropoda •...
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Intertidal / littoral zone
North Keppel Island
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Safety on the intertidal area
• Enclosed shoes, sun safe, water,
• Dangerous marine creatures
• No running, jumping
• Minimal impact
• Turning over rocks – please turn back
• If you don’t know what it is, don’t touch!
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Oysters
• Phylum Mollusca
• Class Bivalvia
• Subclass Lamellibranchia
• Order Anisomyaria
• Family Ostreidae
Oysters are filter feeders.
Posses shells in two hinged
sections.
White/grey colour with maroon
colour on edges.
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Limpets
• Phylum Mollusca
• Class Gastropoda
• Subclass Prosobranchia
• Order Archaeogastropoda
• Family Patellidae
Limpets can be found on the lower edge of the beach rock but are usually in lager number further out in the littoral zone.
Small black ones found first.
Larger ones further out.
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Gastropods
• Phylum Mollusca
• Class Gastropoda
The shell of a gastropod
is an asymmetrical
spiral that functions
as a retreat instead of
a shied.
There are many at NKI.
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Gastropod examples
• Phylum Mollusca • Class Gastropoda
• Subclass Prosobranchia
• Order Mesgastropoda
• Family Littorinidae
Herbivores that graze on algae found on the ‘beach rock’.
Tiny ( less than 10mm).
The rock pools in this area have high salt concentrations.
They look black from a distance but are maroon/brown/black with paler nobs.
Others grey with white apex (15mm)
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Gastropod examples
• Phylum Mollusca
• Class Gastropoda
• Subclass Prosobranchia
• Order Archaeogastropoda
• Family Planaxidae
Large textured spiral with all black or
other dark colour.
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Gastropod examples
• Phylum Mollusca
• Class Gastropoda
• Subclass Prosobranchia
• Order Mesgastropoda
• Family Neritidae
Striped with large first spiral opening
commonly found with hermit crabs
inside.
Some have white band or other
patterns (20mm). Tight fitting
operculum is easy to see and has
a toothed shelf around this
opening.
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Gastropod examples
• Phylum Mollusca
• Class Gastropoda
• Subclass Prosobranchia
• Order Neogastropoda
• Family Muricidae
• Genus Morula
Mulberry snail / oyster borer, a
predator that feeds on other
molluscs.
Has a radula with fewer teeth and it
is used to drill through the shells
of prey (some acid secretions also
to soften the shell also)
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Gastropod examples
• PhylumMollusca • ClassGastropoda
• SubclassProsobranchia
• OrderMesgastropoda
• FamilyTurbinidae
Turban shell, grey colour.
Herbivorous
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Gastropod examples
• PhylumMollusca • ClassGastropoda
• SubclassProsobranchia
• OrderMesgastropoda
• FamilyTrochidae
Trochus or ‘top shell’, feed on detritus
and algae.
Range of colour and patterns with
textured conical shape (slightly
flattened with sharp edge).
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Gastropod examples
• Phylum Mollusca • Class Gastropoda
• Subclass Prosobranchia
• Order Mesgastropoda
• Family Cerithiidae
Ceriths or sand creepers.
Herbivores and detritus feeders.
Range of sizes.
Pale pointy spiral shell with lots of
dark coloured small nobs.
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Chitons
• Phylum Mollusca • Class Amphineura
• Subclass Polyplacophera
Chitons are primitive herbivores that
scrape algae.
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Abalones
• Phylum Mollusca • Class Gastropoda
• Subclass Prosobranchia
• Order Archaeogastropoda
• Family Haliotidae
Abalones or ear shells.
Well camouflaged and patterned.
Lower edge has a series of holes
for respiration.
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Sea Cucumbers
• Phylum Echinodermata
• Class Holotuuroidea
Sea cucumbers.
Detritus or filter feeders.
Radial symmetry but elongated
and lay on their sides.
Black colour.
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Tube Worms • PhylumAnnelida
• ClassPolychaeta
• Subclass
• Order
• FamilyTerebellidae
Tube worm with fragile/delicate
sandy tube.
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Tube Worms
• Phylum Annelida • Class Polychaeta
• Subclass
• Order
• Family Serpulidae
Tube, fan or feather duster worms.
Segmented worms that form a
calcareous tube for protection.
Filter feeders.
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Barnacles
• Phylum Arthropoda
• Class Crustacea
• Subclass Cirripedia
• Order Thoracica
• Suborder Balanomorpha
Barnacles are sessile filter
feeders.
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Soft Coral
• PhylumCnidaria
• ClassAnthozoa
• SubclassOctocorallia
• OrderAlcyonacea
Soft coral, loose
arrangement of
separate calcareous
spicules.
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Hard Corals
• Phylum Cnidaria
• Class Anthozoa
• Subclass
• Order Madreporaria
• Hard coral found in rock pools
looks like leopard skin with rich
brown colours.
• Brain coral feed at night with
tentacles to sting and catch
plankton.
• Branching corals , star corals.
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Organ Pipe Coral
• Phylum Cnidaria
• Class Anthozoa
• Subclass
• Order Stolonifera
Organ pipe coral,
red/pink colour.
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Anemones
• Phylum Cnidaria • Class Anthozoa
• Subclass
• Order Actiniaria
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Sponges
• Phylum Porifera
• Class Demospongiae
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Crabs
• Phylum Arthropoda
• Class Crustacea
• Subclass Malacostraca
• Order Decapoda
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Hermit crab
• Phylum Arthropoda • Class Crustacea
• Subclass Malacostraca
• Order Decapoda
• Suborder Reptantia
Hermit crab, omnivore, scavenger.
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Amphipods
• Phylum Arthropoda • Class Crustacea
• Subclass Malacostraca
• SuperOrder Peracarida
• Order Amphipoda
Amphipods move quickly and are
difficult to spot, especially their
legs, (about 15mm long).
Detritus feeder.