1 Deuterostomes we have studied Echinodermata Class Asteroidea Deuterostomes we will not study Phylum Chordata Subphylum Vertebrata Class Mammalia Other Deuterostomes Phylum Chaetognatha arrow worms Phylum Chordata Phylum Hemichordata acorn worms Phylum Chaetognatha (spined jaws) General Characteristics bilateral deuterostomes (only larvae give the ancestry away) body with lateral and caudal fins grasping spines around the mouth no circular muscle no discrete excretory, respiratory, or circulatory system ventral and dorsal ganglia hermaphroditic/direct development all marine Basic Body Plan (and most all of the information you need to know about Chaetognaths) About 100 species streamlined and most are found in the plankton Pelagic predators: feed by injecting prey with poisons Head with grasping spines Trunk with lateral fins Post anal Tail w/ fin Zonosagitta bedoti FEEDING Feed on other plankton especially the abundant copepod Grasping Spines used to capture prey Tetrodotoxin is the poison used to immobilize prey (It is a sodium channel blocker also used by puffer fish and the blue- ringed octopus
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Basic Body Plan (and most all Phylum Chaetognatha (spined jaws)
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Deuterostomes we havestudied
EchinodermataClass Asteroidea
Deuterostomes we willnot studyPhylum ChordataSubphylum VertebrataClass Mammalia
Other Deuterostomes
Phylum Chaetognathaarrow worms
Phylum Chordata
Phylum Hemichordataacorn worms
Phylum Chaetognatha (spined jaws)
General Characteristics
bilateral deuterostomes (only larvae give the ancestry away)
body with lateral and caudal finsgrasping spines around the mouthno circular muscleno discrete excretory, respiratory, or circulatory systemventral and dorsal gangliahermaphroditic/direct developmentall marine
Basic Body Plan (and most all of the information you need to know about Chaetognaths)
About 100 speciesstreamlined and most arefound in the plankton
Pelagic predators: feed byinjecting prey with poisons
Head with grasping spines
Trunk with lateralfins
Post anal Tail w/ fin
Zonosagitta bedotiFEEDING
Feed on other planktonespecially the abundantcopepod
Grasping Spines used to capture prey
Tetrodotoxin is the poison used to immobilize prey (It is a sodium channel blocker also used by puffer fish and the blue-ringed octopus
S.P. Urochordata (3 Classes)S.P. CepahlochordataS.P. Vertebrata (8 Classes: 4 of which are FISH, 1 Amphibian, 3 “reptiles” of which 1 is Mammalia (19 orders of which 3 are taught in Marine Mammals)