Quiz 2 - Ctenophores Flashcards
Are ctenos found in freshwater
Nope, exclusively marine
What kind of cilia do ctenos have
Comb cilia - the largest cilia on the planet!
What do ctenos use for locomotion
4 sets of comb rows on oral-aboral axis, used for locomotion
Mnemiopsis was a keystone species in the black sea that became invasive and cause fisheries to collapse. But then someting came in ans consumed it… what was this
The beroe form cteno ate mnemiopsis and restored the ecosystem
What are the 2 classes of ctenos
Tentaculata and nuda
Tentaculata have an oral and aboral end, and a sac-like body - what is the snal pores on the aboral side used for?
Water expulsion and statoliths for balance
Tentaculate - what kind of tentacles do they have?
2 long tentacles that are covered in tentilla
What are tentilla
Branch off main tentacles
Used for prey capture - covered in sticky cells / colloblasts
Lobata, platyctnecdia (benthic)m cestide (ribbon like)… what class of ctenos are these
Tentaculata
Describe class nuda
No tentacles
Huge pharynx
What are some similarities between ctenophores and cnidarians
Diploblasts w no cellular middle layer - MESOGLEA
Only mouth, no anus
Gastrovascular cavity = coelentrata
What does determinate development mean
Cells that are broken off cant form a new embryo
Ctenos have this
What is indeterminate development
Cells that breaks off can form a new embryo
Cnidarians can do this
What are some major differences between ctenos and cnidarians
Asexual production in ctenos not good
All ctenos hermaphrodites
Ctenos determinate dev vs cnidarians indeterminate dev
Cteno use cilia to move, cnidarians use sheets of epitheliomusuclad cells
Ctenos swim mouth forward
Ctenos lack cnidocytes (have colloblasts instead)
Some ctenos were w cnidocytes… how is this possible
They consumed something w cnidocytes and used it for protection, didnt actually make cnidocytes
Kleptocnides
