lab 8: echinodermata to chordates Flashcards
echinodermata defining characteristic
internal skeleton composed of CaCO3 lattice
water vascular system
involved in locomotion, prey capture, and resp
echino symm
pentaradial
echino larvae symm
bilateral
echino embryonic development
deuterostome
class stelleroidea
sea stars, and brittle and basket stars
class echinoidea
sea urchins, sand dollars, heart urchins
class holothuroidea
sea cucumbers
class crinoidea
sea lilies, feather stars
dermal ossicles
individual unit of the internal calcareous skeleton covered in epidermis
pedicillariae
baby jaws arranged around the spines of the aboral surface
madreporite
place of intake of w for the w vascular system
tube feet
used in locomotion on sea stars and for catching/opening prey
dermal brachiae
minor role in gas exchange
echinoderm repro
open fert, no parental care
test
echinoidea skeleton - fused plates
aristotle’s lantern
toothed feeding structure in echinoidea
planktonic larval stage of urchins
echinopluteus larva
holothuroidea movement
mostly benthic
calcareous skeleton in holoth
reduced to microscopic ossicles embedded in the body wall and an internal ring near the mouth
pinnules in crinoidea
side branches on the arms used for feeding
calyx in crinoidea
meeting point of arms
ossicles in crinoidea
coin-like structures in stacks that support the stalk
do crinoidea have a madreporite?
no
notochord
a cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals (defining characteristic)
do hemichordates have a notochord
no
what two chordata features do hemichordates have?
- dorsal nerve chord
- pharyngeal slits
pharyngeal slits
openings between the pharynx, or throat, and the outside
buccal tube
dorsal extension of the pharynx
graptolites
an extinct marine invertebrate animal of the Paleozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs
4 features common to chordates
- dorsal hollow nerve cord
- notochord
- pharyngeal slits
- post anal tail
conodonts
a fossil marine animal of the Cambrian to Triassic periods, having a long wormlike body, numerous small teeth, and a pair of eyes
urochordates larva
tadpole-like, motile
urchordate movement
sessile adults; disperse in larval stage
class ascidiacea
sea squirts, tunicates
class thaliacea
salps
class larvacea
mucus-house builders
pharynx in sea squirts
filtering bag which makes up most of the body
tunic in sea squirts
tough outer coating for the pharynx
oral siphon in sea squirts
where water is drawn in
atrium in sea squirts
the main chamber
atrial siphon
where water waste is expelled
sea squirt digestion (3)
- particles trapped in mucus
- mucus slides down digestive system
- wastes expelled out anus
thaloiacea (salps) characteristics (3)
- transparent
- free-living
- planktonic
salps motility
by using their oral and atrial siphons
larvacea movement
they secrete a mucus house around themselves and use movements on their tail to move w thru the house to propel them forward
cephalochordata - lancelets look like
fishes
lancelet characteristics (2)
- filter feeders who draw w thru their pharynx
- spend life buried in the sand with only their heads out
