lecture 18 Flashcards
what is phylum lophophorata
the phylum w lophophores
what are the two extant lophophore phylum
bryozoa and branchiopoda
what is the synapomorphy of lophopgore
semi circular or coiled array of ciliated tentacles
what are some features shared by lophophorata
Bw larva digestive sys gut cavity lifestyle
-lophophore larva
-epistome
-complete digestive system
-eucoelomic cavities
-sessile or sedentary lifestyle
deuterostome vs protostome debate lophophorates
Cleavage
BlSfospors
Gut cavity
deut:
radial and indeterminate cleavage
the blastopore does not become mouth, and there is a multi part eucoelom
prot:
molecular data places them
phylum bryozoa
moss animals
bryozoa how many spp
6300
roles in ecosystem bryozoa
reef building
what are some characteristics of byozoa
Do they have polyps??
colonial
-have zooids rather than polyps
features of zooids
What is skele made of?
exoskeleton made of either calcium carbonate , gelatinous, or chitin
-lack respiratory organs
what do zooids lack?
Resp organs, nephridia, heart and blood vessels
how are bryozoan individuals connected
by tissue strands called funiculi
what does funiculi do
transports nutrients among zooids
what are the different types of zooids
feeding zooid- most common
defensive zooid
vibracula
gonozooid
what are defensive zooids called
avicularia
what are vibrancula
zooids that form long movable brisle.
vibrancula around edges are leg like, for walking
what is function of gonozoids
egg chamber
diet of bryozoa
most are suspen feeders
how do bryozoa feed
cilia on lophophore send particles towards mouth
larger particles flicked towards mouth w tentacles
what is the bryozoa gut like
U shaped gut
different sexes byozoa
colont level is hermaphroditic
how does sexual reproduction occur in bryozoa
sperm released and eggs are brooded
how is a new colony started
larva settle and transform into ancestrula
what do bryozoa larva not look like
trochophore larvae
what happens in bryozoa asexual reproduction
2) what is unique to freshwater species
budding of new zooids
2) statoblasts are produced
what are statoblasts
they are resistant stages of growth, like gemmules. survive freezing and desiccation and can be transported
what are the economic impacts of bryozoa
remove pariculate matter from water and reef build.
they are also fouling organisms
why are bryozoans important to paracites
they are hosts of myxozoans that parasitize fish
Phylum branchiopoda
lamp shells
branchiopoda how many spp
440
when were branchiopods diverse and commong
in the past
how do branchiopoda shells differ from bivalves
enclosed by two calcified shells, but have ventral and dorsal size, and are unequal in size
how do branchiopoda attach to substrate
using stalk called pedicle
do branchiopoda have lophophores
yes, and they can be complexly coiled
where do branchiopoda keep lophophore
inside shell
why called lampshell?
because liek old oil lamps
branchoipoda gut
blind- no anal opening
branchiopoda sexes
seperate- most species release eggs and sperm
what do some branchiopoda larva look like?
trochophore
how doe branchiopoda feed
send small paricles to mouth
