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MARE 171
Marine Invertebrates
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Phylum Porifera
Organization Symmetry Segmentation Body Cavity
Cellular Asymmetrical No None
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Phylum Porifera
True tissues absent; sac with holesSessile, benthic, 8,900 Marine; 100 FW
So, you think youre sponge-worthy? -Elaine Benice
PARAZOA
Spongocoel central cavityOstia small pores (water in)Osculum large opening (water out)
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Phylum PoriferaSponges grouped into four different
classes according to skeletal structure:Class Calcarea-the skeleton consistsof individual spicules of calciumcarbonate
Class Hexactinellida -have spicules ofsilica fused in a continuous latticework
Class Demospongiae -has unfused
silica spicules, AND/OR a tough, keratin-like protein called spongin
PARAZOA
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Silica (Hexactinellida)
Ponponine shrimprecruit to sponge aslarvae; carryout life-cyclewithin sponge
Venus Flower BasketPARAZOA
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Phylum Cnidaria
Organization Symmetry Segmentation Body Cavity
Tissue Radial No None
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Tentacles have batteries of Cnidocytes
-Contain Cnidae organelles that canevert
Nematocysts stinging capsules are cnidae
Phylum CnidariaRADIATA
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There are four major Classes of cnidarians:
Class Anthozoa - includes true corals, anemones,and sea pens
Class Cubozoa - box jellies with complex eyes andpotent toxins
Class Hydrozoa - most diverse group withsiphonophores, hydroids, fire corals, and many medusae
Class Scyphozoa - true jellyfish
Phylum CnidariaRADIATA
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Probably the most famous cnidarians:Include corals, sea anemones, sea fans, & sea pens
Can form reefs (hermatypic corals)Can live in deep ocean, very cold (ahermatypic corals)
Class AnthozoaRADIATA Phylum Cnidaria
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Class Anthozoa
Lack medusa stage entirely Sexual repro: spawning
Asexual repro: budding
Mouth w/ tubular pharynx that projectsinward to gut
Hexamerous or octamerous radial
symmetry or biradial (modified radialsymmetry that limits the # of planes that candivide the body into equal halves)
RADIATA Phylum Cnidaria
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Class CubozoaThey taste like burning Ralph Wiggum
RADIATA Phylum Cnidaria
Similar in form to the "true" jellyfish
Different shape: square when viewed from above-Have four evenly spaced out tentacles orbunches of tentacles & well-developed eyes
(Tetramerous radial symmetry)
20 known spp found in tropical & semitropical waters
The Australian stinger Chironex fleckeriis among thedeadliest creatures in the world, having caused human
fatalities
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Class Cubozoa
Box Jellies Medusa dominant
Polyp stage develops directly into medusa
StatocystsVery poisonous
Carybdea alata:Species found in HI,not deadly Present 10 days after full moon
Caribbean origin, 1800s introballast water?
RADIATA Phylum Cnidaria
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Class Hydrozoa
Hydra, Sea Serpents
Life cycle w/ both medusa & polyps (Polypdominant)
Hydra have ONLY polyp stage Simple gut cavity
Radial Symmetry
Solitary or Colonial Asexual or Sexual reproduction
Includes Hydroids or Stinging Limu,fire coral, blue buttons, By-the-wind Sailors
RADIATA Phylum Cnidaria
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Man-of-War is a Hydrozoan ! Paimalau
4 Different Hydrozoans:
1. The float, orpneumatophore
2. The tentacles, ordactylozooids
3. The digestive polyps,
or gastrozooids
4. The reproductivepolyps, or
gonozooids
RADIATA Phylum Cnidaria
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Class Scyphozoa
True sea jellies, or jellyfish Despite often enormous sizeno head, no
skeleton, & no special organs for respiration or
excretion Life cycle medusa dominant
Tetramerous radial symmetry
Jellyfish range in size 12mm 2 m The largest (Cyanea arctica);tentacles >40m (131 ft) !!
Gut cells divided into complex radial canals
Specialized sensory cells w/ statocysts
RADIATA Phylum Cnidaria
Those whack invertebrates will sting you, old-school! one of those freaking N-Sync bastards referring to jellyfish
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Phylum Ctenophora
Organization Symmetry Segmentation Body Cavity
Tissue Radial No None
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Phylum Ctenophora
Comb Jellies, Sea Gooseberries,Sea Walnuts, or Venus's Girdles :
Exclusively Marine
Gelatinous body w/ 8 rows of ciliary
combs (comb rows) Many bioluminescent
Mostly Hermaphroditic
Carnivores large swarms consume many fishlarvae & plankton daily Colloblasts: Sticky cells at end of
2 tentacles captures prey
Few may have nematocysts (obtained
from jellies?)
RADIATA
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Phylum Platyhelminthes
Organization Symmetry Segmentation Body Cavity
Organ System Bilateral No None /
Acoelomate
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Polyclad flatworms - a group oflarge, free-living or parasitic
Marineflatworms are mainlyfound in tropical coral reefs
Triploblastic
3 Classes: Trematoda (flukes),Cestoda (tape worms), Turbellaria
(include marine flatworms)
Phylum Platyhelminthes
Phylum
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Class TrematodaPhylumPlatyhelminthes
FlukesLive as parasites on or inother animals (including corals)Require intermediate
host
Phylum
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Class Cestoda
PhylumPlatyhelminthes
Tapeworms
Parasites of the digestive
system of vertebrates(including
tuna, sharks, rays, salmon, rockfish, bass,perch, etc.)
Digestive system absent
food digested by host
Phylum
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Class Turbellaria
PhylumPlatyhelminthes
Mostly free-living (non-parasitic) & marineLack specialize organs for gas exchange &circulation
Body surface ciliated for locomotion
Can excrete mucus
Are often mistaken for sea slugs because of their
brilliant color patterns.
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Phylum Nemertea
Organization Symmetry Segmentation Body Cavity
Organ System Bilateral No Proboscis
cavity /
StructurallyAcoelomate
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Ribbon worms
most occur in first20cm of sand, burrowing below surface
have an eversible proboscis which they use to catch smallprey
proboscis is known to be poisonous in some spp, may bearmed (stylet)
Fragment or dioeciousTypically nocturnal
Length averages 140cm (~4 ft)BUT can be up to 100 ft
Most marine; few FW or Terrestrial
Phylum Nemertea
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Phylum Nemertea
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Phylum Nematoda
Organization Symmetry Segmentation Body Cavity
Organ System Bilateral No Pseudocoelom
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Phylum Nematoda
ROUNDWORMSRound bodied, elongate,cylindrical & unsegmented
Pseudocoelomates:-complete digestive tract w/ mouth/anus-longitudinal muscle layer just inside epidermis-hydrostatic skeleton
-fluid in psuedocoel serves both circulatory &respiratory functions
Covered with a thick, chemical resistant cuticle,
capable of being shed
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Phylum Nematoda
Many of the parasitic sppcause important diseases ofplants, animals, and humans
Other spp are beneficial in
attacking insect pests, mostlysterilizing or otherwisedebilitating their hosts
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Phylum Annelida
Organization Symmetry Segmentation Body Cavity
Organ System Bilateral Yes Coelom-
Protostome
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Commonly referred to as
segmented worms;internal & externalsegments, setae,hydrostatic skeletons
Split into 3 major groups;Polychaeta(polychaetes),
Oligochaeta(earthworms etc.) andHirudinea (leeches)
Phylum Annelida
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Phylum AnnelidaClass Polychaeta - bulk
of Annelida-found in nearly every
marine habitat, from
intertidal algal mats,pelagic, benthic
-errant or sedentary
-dioecious or regeneration
-well-developed head, simple
eyes-Parapodia lateral flap,paddle-like appendage oneach segment
-Setae on each parapodiaare bristle-like hairs
*These features aid inswimming, burrowing, sites
for gas exchange*
Ph l A lid
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1.5mlong
Phylum Annelida
Setae/
Pogonophorans gutless polychaetetubeworms- may be oldest living animalsin the sea (over 200 yrs old)*Segmented at very end of body*
-Have endosymbionts -bacteria in a sac in body thatproduce organic matter via
chemosynthesis (usechemical energy to produceorganic matter instead ofsuns energy)
-Indonesia
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Phylum Sipuncula
Organization Symmetry Segmentation Body Cavity
Organ System Bilateral No Coelom-
Protostome
Ph l Si l
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Phylum SipunculaPeanut worms" because some havegeneral shape of shelled peanuts
*Not particularly well studied
Only ~320 spp have beenformally described,all marine & mostly fromshallow waters.
Proboscis w/ring of tentacles-mucus
Dioecious, spawn
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Phylum Sipuncula
Burrow into sand &mud, live in crevices inrocks, empty shells, orbore into rock.
Found in Hawaii
Part of ReefTriggerfishs diet
S i f th D
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Species of the Day
Common Name: Upside-down Jellyfish
Scientific Name: Cassiopea andromedaHawaiian Name: Pololia
Introduced to Hawaii,
probabl ballast ater of ships
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