Echinoderms (Crinoidea and Concentricycloidea)

Question 1

Crinoid ossicles

Answer 1

called “earth stars”

washington family crest > American flag

Question 2

Crinoid holdfast

Answer 2

feather stars- used to grab onto corals or other tall thing to be in current for better filter feeding

sea lillies- anchor

Question 3

Concentricycloidea adaptive zone

Answer 3

deep sea trenches, on sunken wood, feed on dissolved organics

Question 4

Concentricycloidea weirdness

• species
• discovery
• size
• classification
• development
• digestion

Answer 4

~3 living species known

just discovered abt. 20 yrs ago

tiny (1cm)

most likely part of asteroidea

direct development

no gut in 2/3 species- absorb food through oral membrane