Porifera
Needle-like structures that make up the "skeleton" of many sponges
Spicules
Cnidarian have both _____ symmetry and which two germs layers
Radial, ectoderm and endoderm
T/F: Platyhelminthes lack both a lophophore and trochophore
True
Mollusca contain many defining characteristics, including a rasping organ in the mouth.
Radula
T/F: Annelida marks the first appearance of segmentation.
True
Most sponges have this kind of symmetry
Asymmetrical
Specialized stinging cells used for
defense and prey capture
Cnidocyte
Platyhelminthes are some of the earliest examples triploblastic animals and contain this kind of body cavity.
Acoelomate
Protective structure that secretes the shell
Mantle
Errant polychaetes are free-floating organisms that have these paired appendages, used mainly for locomotion and respiration.
Parapodia.
Water enters through the ______ and exits through the ______
ostia, osculum
The best way to distinguish between is that ctenophores lack _____ cells and have a ________ gut
Cnidocytes and complete
Platyhelminthes contain eye spots, that don't see but act as chemical and mechanical receptors.
Oceli
Class Bivalvia lacks these two features that all other Mollusca contain.
Radula and a head
Hydrothermal vent worms are a group of worms that are sedentary and lack both a mouth and digestive tract. Instead, they have this, which contains what specific kind of bacteria.
Trophosome, chemoautotrophic
Most common sponge body form in which choanocytes lie in distinct chambers
Leuconoid
Class Anthozoa are made up of corals and sea anemones, which share the sessile nature of phylum porifera. This means they are lacking this half of the cnidarian lifecycle.
Medusa
Platyhelminthes contain these kinds of specialized cells, that work to add in osmoregulation and excretion.
Flame cells
Unlike other Mollusca, class Cephalopoda have this kind of circulatory system.
Closed.
The clade Clitellata includes both leeches and oligochaetes and are connected through their shared reproductive structure called the what.
Clitellum.
Geliatious, acellular layer of sponges that makes up majority space between the outer cell layer and inner cell layer
Mesohyl
Hydrozoa have life stages that include a free-floating medusa and a hydroid colonial polyps, developing these to feed, reproduce, and defend themselves. (Hint: suffix)
Zooids: Gastrozooid, Dactylozooids, and Gonozooids.
Phylum bryozoa have a common name of this.
Moss animals
Gastropods experience _____, which rotates the shell and flips the direction of the gills, heart, and kidney
Hirudin.