[BZ 212] - Midterm Exam Guide - Everything you need to know! (33 pages long)

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BZ 212
MIDTERM EXAM
STUDY GUIDE
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1 | P a g e
EXAM 2- Iverterates
Mollusca
Aplacophorans
Caudoforeata
Solenogastres
Monoplacophora
Polyplacophora
Gastropoda
Bivalvia
o Protobranchia
o Autobranchia
Scaphopoda
Cephalopoda
o Palcephalopoda
Nautilida
o Neocephalopoda
Coeloida
Annelida
Sipuncula
Echiura
Clitellata
Hirudinoidea
Gnathifera (clade containing phyla)-
Gnathostomulidia
Rotifers
Micrognathozoa
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2 | P a g e
Mollusa
Body plan: mantle, visceral mass, foot, shell
Body Type: coelomate, limited coelom
Special Appendages: tentacles, arms, captacula, siphon
Locomotion: foot
Feeding: foot and radula
Digestion: complete gut
Gas Exchange: ctenidia
Circulation: Open circulation, except cephalopods have closed
Excretion/ Osmoregulation: metanephridia, ammonia and uric acid
Nervous System: cephalized
Sensory Organs: cerata, foot, chromatophores, eyes, photoreceptors, tentacles, osphradia
Reproduction: dioecious, hermaphrodites, spermatophores
Development: 3types of larvae- Trochophore, Veliger, Glochidium, or direct development
Aplacophorans: no shell- caudoforeata, and solenogastres: rudimentary mantle with no well-
developed foot, move by ciliary gliding, few nephridia, less developed all around, secretes
calcareous spicules instead of shell, crystalline style,
Caudoforeata: dioecious, burrowing animal, eats small organisms, has gills
Solenogastres: hermaphrodite, has a siphon, eats cnidarians, has NO gills
Monoplacophora: shallow mantle near foot, repetitive organ arrangement in the mantle
cavity, has 1 shell, tentacles around the mouth disc foot, couple pr ctenidia, small head, no
eyes, dioecious, crystalline style, dioecious
Polyplacophora: Chitons, pallial groove, 7-8 plated shell, many ctenidia, nerve ring,
subradular asthete (photoreceptor cup), Trochophore larvae, marine, only buccal ganglia, no
eyes or tentacles, mantle can cover plates of the shell, crystalline style
Gastropoda: torsion, shell with dextral coiling (to the right), collemena (central axis), spire,
whorls, aperture, wave foot to move or can burrow or attach, they have chemical signals in
their mucus, geomagnetic, slipper shell reproduction, and veliger Trochophore larvae or direct
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