LAB 8 Flashcards
(25 cards)
what phylum is subphylum urochodata from
phylum chordata
how many classes of urochordates are there
4 classes
what are the urochordate classes
ascidiacea (ascidians or sea squirts), thaliacean (salps), appendicularia (larvaceans), sorberacea
what do all organisms in urochordata have?
a tunic made of cellulose-like carbohydrate tunicin
what are the defining characters of urochordata
deuterostomes, pharyngeal slits, dorsal notochord, dorsal hollow nerve cord, filter feeders
ascidians can either be solitary or colonial
true
what are colonial structures called
zooids
what structure in colonial ascidians are zooids on
zooids share an atrial siphon
what secretes the tunic
epidermis
what is sexual reproduction in ascidians
most colonial species retain eggs and fertilization is internal. they produce microscopic larvae that are short-lived and non-feeding pelagic tadpoles (philopatric)
what are ascidian larvae
philopatric
class thaliacea key features
linear water flow that provides propulsion and often bioluminescent
how do salps feed
pelagic suspension feeders
what are lophophorates
a grouping of three invertebrate phyla that share the presence of a lophophore
what is a lophophore
a folder tentacular structure surrounding the mouth which is used for feeding and respiration
what are the three phyla grouped as lophophorates
brachiopoda, ectoprocta (bryozoans) and phoronida
how do appendicularia move
have a linear water flow that provides propulsion
what are defining characteristics of phylum brachiopoda
body enclosed within a 2 valved shell, articulate and inarticulate forms, marine only
brachiopod reproduction is…
dioecious. can have external or internal fertilization with either free-swimming lobate larval stage of brood of embryos
phylum bryozoan key features
colonies, primarily marine, largest lophophorate phylum
individual colony term in bryozoan is termed a zooid
treu
how do bryozoans reproduce?
sexually where colonies are hermaphoditic and individuals are dioecious.
what do bryozoan colonies grow from
single founder larvae call ancestrula
what is the bryozoan free-swimming larvae called?
cyphonaute larvae
