The opening at the lower end of the alimentary canal through which solid waste matter is eliminated.
B Ec[000000]f[16]BLantennaB
A jointed feeler found on the head of various Arthropoda.
B Ec[000000]f[16]BLanteriorB
Near the head; ventral.
B Ec[000000]f[16]BLanticholinesteraseB
A substance that inhibits the enzyme cholinesterase, an enzyme that inactivates the transmission of nerve impulses in the body.
B Ec[000000]f[16]BLbifurcateB
To divide into two parts or branches.
B Ec[000000]f[16]BLbilateral symmetryB
The arrangement of an organism or body part along a central axis; divided into equal halves by only one plane.
B Ec[000000]f[16]BLcalcareousB
Composed of or containing calcium carbonate.
B Ec[000000]f[16]BLcarapaceB
The bony shield covering the whole or part of the back of certain animals.
B Ec[000000]f[16]BLcarnivorousB
Flesh-eating.
B Ec[000000]f[16]BLcarrionB
Dead and decaying flesh.
B Ec[000000]f[16]BLcephalothoraxB
The body region formed by the fusion of the head and the thorax.
B Ec[000000]f[16]BLchelaeB
Pincerlike claws.
B Ec[000000]f[16]BLcheliceraeB
Fanglike appendages near the mouth of an arachnid that are used for grasping and piercing.
B Ec[000000]f[16]BLchelipedB
A claw-bearing appendage.
B Ec[000000]f[16]BLchitinB
A protective, semitransparent substance characteristic of the arthropod exoskeleton.
B Ec[000000]f[16]BLcircadian rhythmB
A metabolic or behavioral rhythm.
B Ec[000000]f[16]BLcirriB
Tendrils or tendril-like structures.
B Ec[000000]f[16]BLcloacaB
The posterior part of the intestinal tract of various invertebrates.
B Ec[000000]f[16]BLCrustaceaB
The taxonomic class of mainly aquatic arthropods, which usually are characterized as having two pairs of antennae and a carapace.
B Ec[000000]f[16]BLdactylB
A digit; a finger or toe.
B Ec[000000]f[16]BLdorsoventralB
Of or relating to structures that extend from the dorsal to the ventral side of an animal.
B Ec[000000]f[16]BLectoparasiteB
A parasite that lives on the exterior surface of an organism.
B Ec[000000]f[16]BLestuaryB
An arm of the sea that extends inland to meet the mouth of a river.
B Ec[000000]f[16]BLeviscerationB
The removal of an internal organ from the thorax or abdomen.
B Ec[000000]f[16]BLexoskeletonB
A hard, outer structure that provides protection or support for an organism.
B Ec[000000]f[16]BLeyestalkB
A movable, stalklike structure found on the external body of certain crustaceans, including crabs and shrimps, which bears an eye at its tip.
B Ec[000000]f[16]BLgonadB
An organ in animals that produces gametes, or reproductive cells.
B Ec[000000]f[16]BLhermaphroditicB
Of or relating to an organism with both male and female reproductive organs.
B Ec[000000]f[16]BLholothurianB
A member of a class of echinoderms that commonly are called sea cucumbers.
B Ec[000000]f[16]BLhummockB
A low mound or ridge of earth; a knoll.
B Ec[000000]f[16]BLintertidalB
Of or relating to plants and animals that live on a shoreline between the high-water mark and the low-water mark of the ocean's tides.
B Ec[000000]f[16]BLlarvaeB
Embryos that are self-sustaining and independent before they assume the characteristic features of their parents.
B Ec[000000]f[16]BLmandibleB
A paired mouth appendage characteristic of arthropods.
B Ec[000000]f[16]BLmantleB
The soft, outer fold of integument located next to a mollusc's shell.
B Ec[000000]f[16]BLmaxillaeB
Laterally moving appendages that are situated behind the mandibles of arthropods.
B Ec[000000]f[16]BLmaxillipedB
An appendage, consisting of one, two, or three pairs, which is located posterior to the maxillae.
B Ec[000000]f[16]BLmetamorphosisB
A developmental process undergone by certain animals that involves a dramatic physical transformation of bodily form and structure between the embryonic and adult stages.
B Ec[000000]f[16]BLmoltB
The process of shedding an outer covering, such as an exoskeleton, prior to a period of new growth.
B Ec[000000]f[16]BLnaupliusB
The earliest larval stage of certain crustaceans.
B Ec[000000]f[16]BLnocturnalB
Of or relating to animals that move about and seek food only at night.
B Ec[000000]f[16]BLomnivoreB
An animal whose natural diet consists of meat and plant matter.
B Ec[000000]f[16]BLomnivorousB
Consuming both plant matter and meat obtained from animals.
B Ec[000000]f[16]BLparasiticB
Characteristic of a parasite, or an organism that derives its sustenance from living on or in the body of another organism, often with harmful effects to the host organism; of or relating to a disease caused by parasites.
B Ec[000000]f[16]BLpedicelB
A small, footlike stock, part, or organ.
B Ec[000000]f[16]BLpedipalpiB
A pair of pincerlike claws or leglike appendages.
B Ec[000000]f[16]BLpentamerous symmetryB
Composed of five parts.
B Ec[000000]f[16]BLperitoneumB
A membrane that lines the walls of the abdominal cavity.
B Ec[000000]f[16]BLplanktonB
Small (usually microscopic) marine plants and animals that drift in the currents of the ocean, providing an important food source for many aquatic animals.
B Ec[000000]f[16]BLposteriorB
Situated behind or at the end; dorsal.
B Ec[000000]f[16]BLprotandrous hermaphroditeB
A term describing an organism, such as some species of isopods, in which male gametes mature and are shed before the female gametes mature.
B Ec[000000]f[16]BLradial symmetryB
The symmetrical arrangement of parts radiating from a central point.
B Ec[000000]f[16]BLradulaB
A flexible, tonguelike organ found in certain molluscs, which has rows of horny teeth on its surface.
B Ec[000000]f[16]BLrespiratory treeB
A respiratory system that contains a series of tubules arising just inside the anus, into which water can be drawn and expelled.
B Ec[000000]f[16]BLrostrumB
A beaklike or snoutlike projection.
B Ec[000000]f[16]BLsessile eyesB
Stalkless eyes attached directly to the head.
B Ec[000000]f[16]BLspiculeB
A small, needlelike structure made of calcareous material.
B Ec[000000]f[16]BLsubtidalB
A zone of shallow water below the low tide line.
B Ec[000000]f[16]BLswimmeretB
A pair of abdominal appendages found on certain crustaceans that are adapted for swimming and which, in female crustaceans, are used to carry eggs.
B Ec[000000]f[16]BLsymbiosisB
An association between two or more different organisms that may (but not necessarily) benefit each organism.
B Ec[000000]f[16]BLtelsonB
An unpaired, terminal abdominal segment of Crustacea.
B Ec[000000]f[16]BLtendrilB
A twisting, threadlike structure.
B Ec[000000]f[16]BLterrestrialB
Of or relating to organisms that live on land.
B Ec[000000]f[16]BLthoracicB
Of or relating to the thorax, the region of the body located behind the head.
B Ec[000000]f[16]BLthoraxB
The region of the body located behind the head.
B Ec[000000]f[16]BLtube feetB
Organs used by certain animals for locomotive, sensory, food-catching, and respiratory functions.
B Ec[000000]f[16]BLuropodB
An abdominal appendage of Crustacea, located in front of the telson.
B Ec[000000]f[16]BLvascularB
Consisting of vessels adapted for the transmission or circulation of bodily fluids.
B Ec[000000]f[16]BLvestigialB
Occurring or persisting as a rudimentary or degenerate structure.
B Ec[000000]f[16]BLwater-vascular systemB
A system of canals that circulate watery fluid throughout the bodies of echinoderms, connecting their tube feet.
