Lecture 6 Flashcards
pinacocytes (porifera)
line the outer surface, mildly contractile, porocytes surround the ostia
mesenchyme (porifera)
archaeocytes move within the mesohyal, transport food, secrete skeletal elements including spicules and spongin
archaeocytes
asexual reproduction by forming gemmules
Spicules
calcium carbonate or silica structures for skeletal support
spongin
fibrous collage to provide skeletal support
Choaonocytes
line the inner cavity (spongocoel), flagellate with microvilli, creates water current and forms a collar to trap food.
Sexual Repro in Sponges
mesenchyme form oocyte, choanocytes form sperm, release in water
How do sponges get rid of wastes
diffusion
characteristics of porifera
pores/canals, spicules and spongin, gemmules, filter feeds, asymmetrical or radial
Ostia
pores in the outer body of sponges where water is brought in along with nutrients
osculum
the upper mouth/spout of sponges where water exits
Calcarea
have spicules of calcium, all marine, can have all 3 canal systems, can have color (crunchy) (OCEAN SPONGES)
Asconoid
simplest tube shaped structures with only one osculum
syconoid
has infolding to create more surface area for feeding, still only one osculum
Leuconoid
has multiple osculum, has a web of canal systems, sometimes spherical in shape
Demospongiae
silica spicules or spongin, leuconoid canal system, one freshwater family, BATH SPONGES
Hexactinellida
Six rayed spicules of silica, all marine and deep water, syconoid or leuconoid
