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Mesozoa
small phylum with complex lifecycles but simple bodies.
two tissues layer ectoderm and mesoderm neither diplo or triplo.
lack any specialized digestive circulatory resp, sensory or nervous system.
nutrients and waste diffuse through body wall
endoparasites of marine invertebrates very specific habitat in host.

ciliated outer membrane for locomotion.
Ctenophora
predators, bilateraly symmetrical, transparent with iridescent combs, diploblastic gastrodermis, mesoglea and epidermis. nerve network no specialized respiratory system. ciliated combs for locomotion called ctene arranged in eight rows. statoliths for balance. use sticky cells colloblast to capture prey. hermaphroditic gametes released into digestive tract and expelled through the mouth. embryo development is determinate and most species develop into a cydipid larva.
Nemertea
lophotrochozoa, bilateral, coelomate, protosomes elongated unsegmented soft bodies. eversible proboscis move by peristaltic contractions using musculature against the hydrostatic skeleton. protonephridia closed circulatory system. dioecious, extermal fertilzation from temporary gonads.
siboglinidae
marine benthic tube worms that live in hydrothermal vents. no digestive system as adults with trophosome with symbiotic chemosynthetic bacteria. long cylindrical body covered by a chitinous cuticle. respiration through tentacles, colomoducts. gonochorisitcs. setttles on the substrate and grow into mature adult internal and external fertilzation.
phylum tardigrada
close relative to arthropoda
bilaterally symmetric and metameric unjointed appendages used in locomotion. protusible oral stylets used to pierce before ingesting it using a muscular pharynx. no circ or resp structure. gas exchange occurs through the chitinous cuticle. molt. malpighian glands for osmoregulation with nervous system a paired ventral nerve cord with ganglia. gonochorisitc sexual with external fertilization with eutelic
feed on plants, microoorganisms, tardigrads parasitic restricted to moist envt. cryptobiotic state
pycnogonidae
chelicerata sea spiders,
found in oceans thin segmented body with jointed legs and proboscis. walk and swim carnivores feeding on invertebrates some consume algae or dead tissues. dioecious, fertilzation is external female have courtship dance. males exhibit parental care.
trilobites
extinct marine arthropods
same basic body plan cephalon thorax and pygidium. segmented undifferentiated and biramous appendages. hypostome to break food. compound eye. fossilize calcite exoskeleton. decrease in diversity probably lead to their extinction.
phylum onychophora
terrestrial nocturnal panarthropods. softbodies, segmented ecdysozoans with a fluid filled body cavaity that acts as a hydrostatic skeleton. carivory herbivory omnivory open circulatory system, gas exchange occurs thoruh body, nephridia for exchange. dioecious.
phylum brachiopoda
bilateral, mantle and bivalved cac03 shell. once placed into mollusca. dissimilar size shells.sessile filter feeding marine animals attached to substrate using stalk strucutre. dioecioeus sexual nephridia acts as gonoduct external fertilzation planktotrophic larva which eventually settle on a substrate.
rotifera
pseudocoelomates, three body parts, head trunk and the foot. corona ciliated anterior lobe. fresh water marine, muscular pharynx for feeding. secrete mucus from toes and a syncytial epidermis. sensory system free living and short lived, some are planktonic swim by beating the coronal cilia other use the toes to move filter feeders. parasitic on arthropods and annelids
acanthocephala
spiny headed parasites of vertebrate guts, 3 distinct parts proboscis neck and thetrunk. diffusion across the body wall resp nutrition and excretion. unique hollow interconnected structures in their muscles. fluid in these structures serve as pseudocirculatory system.
gonochorisitic release thousand eggs.
hemichordata
marine deuterstomes worms that are considered to be sister clade to both echinioderms and chordates. dorsal hollow nerve cord and pharyngeal gill slits and what was believed to be a notochord. burrow in shallow water 3 regions with separate coelom comparment proboscis used for locomotion and burrowing and food colection the collar which houses the mouth and the trunk. dioecious organisms with external fertilization. planktonic larva. suspension or deposit feeders.
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