PHYLUM MOLLUSCA Invertebrates Freshwater marine amp terrestrial Largest marine phylum 23 of named marine species Mantle Radula Ventral foot CLASS CEPHALOPODA Squids octopods cuttlefish ID: 513066
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PHYLUM MOLLUSCASlide2
PHYLUM MOLLUSCA
InvertebratesFreshwater, marine, & terrestrial
Largest marine phylum
23
% of named marine speciesMantleRadulaVentral footSlide3
CLASS CEPHALOPODA
Squids, octopods, cuttlefish, Nautiloidea
Bilateral symmetry
Marine
Arms or tentaclesSlide4
ORDER TEUTHIDA – SQUIDS
8 arms in pairs of 22 tentacles (usually longer)
Largest eye-to-body ratioSlide5
FAMILY LOLIGINIDAE
“pencil squids”Body tapers to a point
Arms are partially retractable
Buccal membrane has 7 lappetsSlide6
Sepioteuthis sepioidea
Caribbean reef squid
Cigar-shaped body
Arms shorter than body
10-20 cm longFins extend almost whole length of bodyUndulate rapidly as they swimSlide7
Sepioteuthis sepioidea
Unique behaviors
Pointing bodies upward prior to striking prey
Curling upward during territorial disputes
Pointing head-down when approached by predatorsFound in Caribbean sea and off the coast of FloridaYoung congregate in turtle grassesDie after reproducing (like other cephalopods)
First squid to be observed “flying”?Slide8
Squid FlightSlide9
ORDER OCTOPODA
8 arms
No shellSlide10
FAMILY OCTOPODIDAE
Majority of know octopods Bottom-dwelling
Suckers in one or two series
One arm modified as open sperm groove in malesSlide11
Octopus briareus
Caribbean reef octopus
“Chunky” body compared to arms
40 – 60 cm long, up to 1.5 kg
Dark ring around eyeNo dark borders on suckersSlide12
Octopus briareus
Cannibalistic when confined in small tanks with others
Nocturnal hunters
Reflective skin is easy to see at night
Uses chromatophores for camouflage Disguise themselves as other species or objectsOne of the most intelligent invertebratesVery little sexual dimorphismAlso die after reproducing
Females live long enough to guard eggs