| Annelid | Arthropod | Echinoderm | Foot | Hemocoel |
| Labium | Labrum | Mandible | Mantle | Maxillae |
| Mollusca | Pedipalp | Radula | Trachea | Trochophore |
| Tube Feet | Visceral Mass | Water Vascular System |
Annelid: Any of various
worms or wormlike animals of the phylum Annelida, characterized by an elongated,
cylindrical, segmented body and including the earthworm and leech
Drawing of an Annelid
Arthropod: Any of numerous invertebrate animals of the phylum Arthropoda, including the insects, crustaceans, arachnids, and myriapods, that are characterized by a chitinous exoskeleton and a segmented body to which jointed appendages are articulated in pairs
Examples of Arthropods
Echinoderm: Any of
numerous radially symmetrical marine invertebrates of the phylum Echinodermata,
which includes the starfishes, sea urchins, and sea cucumbers, having an
internal calcareous skeleton and often covered with spines
Echinoderms
Foot: A structure used for locomotion or attachment in an invertebrate animal, such as the muscular organ extending from the ventral side of a mollusk
Clam with labeled parts
Hemocoel: A cavity or series of spaces between the organs of most arthropods and mollusks through which the blood circulates
Organism with a hemocoel
Labium: A liplike structure, such as that forming the floor of the mouth of certain invertebrates, especially insects. The inner margin of the opening of a gastropod shell.
Diagram of a grasshoppers head
Labrum: A lip or liplike structure, such as the one forming the roof of the mouth in insects. The outer margin of the opening of a gastropod shell
Diagram of a Labrum
Mandible: Any of various mouth organs of invertebrates used for seizing and biting food, especially either of a pair of such organs in insects and other arthropods
Diagram of a mandible
Mantle: A fold or pair
of folds of the body wall that lines the shell and secretes the substance that
forms the shell in mollusks and brachiopods.
The soft outer wall lining the shell of a tunicate or barnacle.
Clam with labeled parts
Maxillae: Either of two laterally moving appendages situated behind the mandibles in insects and most other arthropods
Diagram of Maxillae
Mollusca: One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, Pteropoda, Scaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve
Examples of Mollusks
Pedipalp: One of the second pair of appendages near the mouth of a spider or other arachnid that are modified for various reproductive, predatory, or sensory functions
Parts of the pedipalp
Radula: A flexible
tonguelike organ in certain mollusks, having rows of horny teeth on the surface
Radula on an Octopus
Trachea: One of the internal respiratory tubes of insects and some other terrestrial arthropods
Trachea
Trochophore: The small,
free-swimming, ciliated aquatic larva of various invertebrates, including
certain mollusks and annelids
Life Cycle of Jellyfish
Tube Feet: One of the numerous external, fluid-filled muscular tubes of echinoderms, such as the starfish or sea urchin, serving as organs of locomotion, food handling, and respiration
Tube Feet
Visceral Mass: An organ system that uses cilia to propel food, gametes and metabolic wastes.
#3
Water Vascular System: a system of vessels in annelids, nemerteans, and many other invertebrates, containing a circulating fluid analogous to blood, but not of the same composition. In annelids the fluid which they contain is usually red, but in some it is green, in others yellow, or whitish
Diagram of a Water Vascular System
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