Exam 3 Flashcards
What phylum is characterised as flatworms, bilateral acoelomates flattened dorsoventrally and triploblastic
Platyhelminthes
Do Platyhelminthes have synapomorphic characters?
No
Platyhelminthes have a loose tissue that fills the spaces between other more specialised cells called
Parenchyma
Parenchyma provides
Skeletal support
Nutrient storage
Motility
Transport
What are the four classes of Platyhelminthes
Turbellaria
Monogenea
Trematoda
Cestoda
What class is this planarians Mostly free living and aquatic; carnivorous aquatic forms; external surface usually ciliated; predaceous; possess rhabdites, protrusible proboscis, frontal glands and many mucous glands; mostly hermaphroditic
Turbellaria
What class is this Mostly ectoparasites on vertebrates(usually fishes, occasionally turtles, frogs, copepods, squids); one lifecycle form in only one host; bear opisthaptor; monogenetic flukes
Monogenea
What class is this
flukes including schistosomes
suckers for attatchment
All are parasitic; several holdfast devices present; have complicated life cycles involving both sexual and asexual reproduction; trematodes
Trematoda
What are the two subclasses of Trematoda
Aspidogastrea
Digenea
Describe the subclass aspidogastrea
Mostly endoparasites of molluscs; possess large opisthaptor; most lack an oral sucker
Describe the subclass digenea
Adults endoparasites in vertebrates, at least two different life cycle forms in two or more hosts; have oral sucker and acetabulum
What class is this
tapeworms
All parasitic with no digestive tract; have great reproductive potential; tapeworms
Cestoda
What are the two subclasses of cestoidea
Cestodaria
Eucestoda
Describe the subclass cestodaria
Body not subdivided into proglottids; larva in crustaceans, adults in fishes
Describe the subclass eucestoda
True tapeworms; body divided into scolex, neck, and strobila; strobila composed of many proglottids; both male and female reproductive systems in each proglottid, adults in digestive tract of vertebrates
What are ctenophora
comb jellies
what are cnidaria
jellyfishes, anemones, corals, etc
these unique groups are marine and have complex life cycles including polyp and medusa stages, have true tissues and are mostly diploblastic (some may be triploblastic)
this group is primarily radially symmetrical and many are predatory actively hunting in the water column while others are sessile sitting and plucking prey out of the water column or filter feeding
cnidaria, ctenophora
Cnidaria and ctenophora have been around since the ____ period
edicarian
What class is in phylum ctenophora
Tentaculata
what are characteristics of tentaculata?
Comb jellies; Marine coastal waters; utilize cilia for transportation; most species hermaphroditic, lack stinging cells
What classes make up cnidaria
hydrozoa, scyphozoa, cubozoa, anthozoa
what are characteristics of hydrozoa
Portuguese man-o-war; mainly marine, both polyp and medusa stage; polyp colonies in most
what are characteristics of scyphozoa
jellyfish; marine coastal waters; polyp stage restricted to small larval forms
what are characteristics of cubozoa
box jellyfish; marine coastal waters; polyp and medusa stage; square shaped when viewed from above
what are characteristics of anthozoa
sea anemones, corals, and sea fans; marine coastal waters; solitary or colonial polyps; no medusa stage; partitioned gastrovascular cavity
what classes make up mollusca
polyplacophora, gastropoda, bivalvia, cephalopoda
what are characteristics of polyplacophora
Chitons; marine; shell of eight dorsal plates; broad foot
what are characteristics of gastropoda
snails and slugs; marine, freshwater and terrestrial; coiled shell; prominent head with tentacles and eyes
what are characteristics of bivalvia
clams, oysters, and mussels; marine, freshwater; body compressed between two hinged shells in a left and right arrangement; hatchet shaped foot
what are characteristics of cephalopoda
squids and octopi; marine; excellent swimmers, predatory; foot separated into arms and tentacles that may contain suckers; well developed eyes
