Week 9 Flashcards
T or F: Acoelomate bilaterans are triploblastic
T
what are the two types of muscles in platyhelminthes
longitudinal and circular muscle
T or F: there are free living and symbiotic platyhelminthes
T
free living platyhelminthes have a _____ epidermis with ______
ciliated, rhabdites
how do free living platyhelminthes feed
mid-body mouth, protruding pharynx
how do symbiotic platyhelminthes feed
anterior mouth
what are protonephridia
flame cells: osmoregulatory function and deal with fluid balance
T or F: phylum platyhelminthes can either have a simple or complex nervous system
T
What is the difference between the simple and complex nervous system
simple has a subdermal nervous nerve plexus, whereas complex has a CNS
how do platyhelminthes reproduce asexually
fission
why is segmentation important in annelids
allowed for evolution
coelom forms in annelids by _____
schizocoely
what are setae
present in annelids, tiny chitinous bristles that prevent them from slipping backwards
what are the different types of annelids
polychaetes, earthworms and leeches
T or F: annelids have both circular and longitudinal muscle
T
what is the pygidium
the last segment in annelids
what is the prostromium
segment with sensory cells including the eyes
what are the two parts of the parapodim
noto and neuropodum
what class of annelids are the most important in marine enviornments
polychaetes
what are some characteristics of polychaetes
well differentiated head, paired parapodia, no citellum, jaws or tentacles
T or F: polychates are a true class
F
T or F: polychaetes have the best developed organs
T
what are parapodia used for
crawling, swimming, or achoring in tubes
what are errant polychaetes
predators and scavengers, mobile
why are the major invertebrate taxa difficult to accurately estiamte
undersampled and understudied, some taxonomists differ within species identification
what is the functional role of porifera in coral reef
numerous symbiotic relationships with microorganisms,
T or F: soft corals have less diversity than the hard corals
F
what are sipuncula
peanut worms
what are decapods
crayfish,crabs,lobsters,shrimp
how are shrimps (malacostracta) important for coral reefs
commensals on invertebrate hosts, mutualistic relationshops with fish (cleaner shrips)
how do crabs help coral reefs
some live symbiotically with corals, feed on mucus, ingest coral tissues etc
