BNS-1002 Porifera Flashcards
what is porifera
Invertebrates without tissues
In what environments can sponges be found
tropical reef flats
deep sea floor
rock pools
what factor controls the structural form of sponges
settling substrate and environment
Is there body symmetry in sponges
there is no body symmetry in sponges
what do some sponges have
a symbiotic relationship with algae
what diet do sponges have
they are filter feeders
what are the 4 classes of 4 classifed by
the structural support within their body walls
what does the class hexactinellidae have in its body wall
a syncytium
what do the classes demospongiae, homoscleromorpha and calcarea have in their walls
they are more typical and have cellular body walls
what is the pinacoderm
a monolayer of flat cells-body surface
what are sited in the pinacoderm
numerous small pores called ostia
through which water enters
what is the centre of a sponge called
the atrium
what is the atrium lined by
a single layer of cells called chonaoderm
how does water exit sponges
via the osculum
what is the osculum usually? and what does this do?
osculum often elevated
creates pressure differential
to draw flow up and out of atrium
