| A | B |
|---|
| abdomen | The posterior segment of the body in arthropods |
| antennae | One of the paired, flexible, segmented sensory appendages on the head |
| arthropods | 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 |
| benthic | The collection of organisms living on or in sea or lake bottoms |
| cephalothorax | The anterior section of arachnids and many crustaceans, consisting of the fused head and thorax |
| chelicerata | spiders; subphylum of scorpions; horseshoe crabs |
| chelicerae | Either of the first pair of fanglike appendages near the mouth of an arachnid, such as a spider, often modified for grasping and piercing. |
| chitin | A tough, protective, semitransparent substance, primarily a nitrogen-containing polysaccharide, forming the principal component of arthropod exoskeletons and the cell walls of certain fungi |
| compound eye | The eye of most insects and some crustaceans, which is composed of many light-sensitive elements, each having its own refractive system and each forming a portion of an image |
| crustacea | a large class of mostly aquatic arthropods that have a chitinous or calcareous and chitinous exoskeleton, a pair of often much modified appendages on each segment, and two pairs of antennae and that include the lobsters, shrimps, crabs, wood lice, water fleas, and barnacles |
| decapod | A crustacean of the order Decapoda, such as a crab, lobster, or shrimp, characteristically having ten legs, each joined to a segment of the thorax |
| ecdysis | The shedding of an outer integument or layer of skin, as by insects, crustaceans, and snakes; molting. |
| egg sponge | they lay an egg mass otherwise known as an “egg sponge”, which harbors up to about eight million eggs |
| exoskeleton | A hard outer structure, such as the shell of an insect or crustacean, that provides protection or support for an organism |
| 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 |
| maxillae | Either of two laterally moving appendages situated behind the mandibles in insects and most other arthropods |
| megalops larvae | A larva, in a stage following the zo["e]a, in the development of most crabs. In this stage the legs and abdominal appendages have appeared, the abdomen is relatively long, and the eyes are large |
| merostomata | A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. |
| molting | To shed periodically part or all of a coat or an outer covering, such as feathers, cuticle, or skin, which is then replaced by a new growth |
| pincers | The articulated prehensile claws of certain arthropods, such as the lobster |
| planktonic | The collection of small or microscopic organisms, including algae and protozoans, that float or drift in great numbers in fresh or salt water, especially at or near the surface, and serve as food for fish and other larger organisms |
| segmented | A clearly differentiated subdivision of an organism or part, such as a metamere. |
| telson | The rearmost segment of the body of certain arthropods |
| thorax | The second or middle region of the body of an arthropod, between the head and the abdomen, in insects bearing the true legs and wings |
| zoea | A larval form of crabs and other decapod crustaceans, characterized by one or more spines on the carapace and rudimentary limbs on the abdomen and thorax |
