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The last, and usually largest, of the three portions of an insects body. The abdomen does not have any true legs. It begins after the thorax. It usually is made up of anywhere from 8 - 11 segments. |
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A fan of setae (long hairs) on the end of the abdomen |
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On a leech this is what appears to be a single segment. In actuality there are several annuli per body segment. |
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Slender sensory appendages arising from the front of the head |
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At or toward the front of the body |
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Angles that are perpendicular to the body of the insect |
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The opening in a snail shell where the snail's foot and head emerge |
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The end of an appendage opposite the point of attachment, the tip of an appendage |
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Pertaining to the apex; example - "apical setae" would be a hairlike structure on the tip of an appendage |
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Lateral (to the sides) to the apex |
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Any structure attached to the body |
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| B |
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(base) point of attachment for an appendage to the body |
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The raised loops, bumps and ridges on the umbo. |
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The raised loops, bumps and ridges on the umbo. |
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Having two lobes, usually referring to gills |
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Salt content greater than that of fresh water |
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| C |
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Having one or more spiral ridges |
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Species that feeds on other organisms |
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Toward the tail or posterior end of an organism |
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Terminal gill filaments of the damselfly larvae (Zygoptera). Usually flat and broad |
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Appendage on terminal abdominal segment |
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One cerci - an appendage on terminal abdominal segment |
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A pincerlike exoskeleton at the end of an appendage |
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Oval rings occuring on the abdomen of some Trichoptera |
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The segments on an annelid where the sexual pores are located. It secretes substances necessary for reproduction. It may be appear swollen. |
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Species that are detrivores, herbivores, or both |
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In a spiraling gastropod shell it is the pillar located in the center of the coils. |
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To whorl towards the apex in a cone-shaped fashion |
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Mounded, a surface that curves outward |
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The segment of a leg that is nearest the body |
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Curved hooks that are found at the terminal end of prolegs |
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| D |
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An appendage found at or near the end of the abdomen in Collembola |
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Bodies of water with fine sediment deposits such as water pools |
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Dead and decomposing plant or animal material |
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Organisms that feed on dead and decomposing plant or animal material |
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When viewing snail from the front, with the apex at the top, the aperture will be located on the right side. |
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A unicellular form of algae |
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At or near the outermost region of a structure, opposite of Basal |
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Towards the side of the dorsal surface |
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| E |
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Molting of the old exoskeleton |
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Long and spearshaped in appearance |
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The hardened fore wing of Coleoptera adults |
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Carnivores that attack prey and swallow it whole |
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A body plate on the side of an adult beetle thorax |
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Bodies of water with coarse sediment deposits such as riffles |
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| F |
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Third major segment of the leg |
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Thin filamentous structures |
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Threadlike, usually refers to the appearance of the antennae |
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Organisms that feed on decomposing material, and plant material at the surface |
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The wing closest to the head, arises from the second thoracic segment |
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Formed for or with the habitat of digging, usually used to described modified legs |
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| G |
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Organisms that feed on decomposing material, and plant material at the bottom of the water body |
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A respiratory structure through which oxygen is obtained |
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The median terminal lobe of the labium, usually located on the underside of the head |
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The genital pores on the ventral surface of leeches. Since leeches are hermaphrodites there is both a male and female pore. The male pore (black arrow) is closer to the oral sucker, the female pore (white arrow) is closer to the larger tail sucker. |
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| H |
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Fused head sclerites that form a case |
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Forewings of insects that are thicker at their base |
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Species that feed on plant material |
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An organism that a parasite uses for its own advantage |
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| I |
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Developmental stages of larval insects |
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Coastal area between low and high tide |
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| L |
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On Odonata the part of the labium that covers part of the head |
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A pair of segmented appendages arising from the lower lip (labium) of an insect's mouth |
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A fan of setae found by the mouth of an organism |
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The upper lip of an insects head |
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Leaflike structure at the terminal end of a damselflies abdomen |
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Elongated teeth along hinge line of shell |
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Still bodies of water such as lakes and ponds |
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On the prementum, the small bump between the two palpal lobes, or a toothed plate found behind the dorsomental teeth in the Tanypodinae subfamily of Diptera. |
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The near shore areas of ponds and lakes where rooted and emergent plants grow |
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Along the length of the body |
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Flowing bodies of water such as rivers and streams |
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| M |
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One of the mouthparts located directly behind the upper lip, in insects with chewing type mouthparts they are usually sickle shaped and the main structures for ripping and tearing the food |
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The mouthparts that are located between the mandible and the lower labium |
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A ventral plate on the ventral side of the head |
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Dorsal surface of the second thoracic segment |
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In Diptera an elongate sclerite which extends from the head into the prothorax |
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The ventral part of the final thoracic segment |
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Terminal segment of the dentes |
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| N |
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Organisms which are active at night |
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Line located on outer edge of wing |
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Grooves on Coleoptera adults that are found on the ventral side of the notum |
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Dorsal surface of thoracic body segment |
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| O |
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Species that feeds on both organisms and plants |
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A plate-like structure attached to the foot of most Gastropods. |
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| P |
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The tarsal segment of a Corixid front leg |
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Paired lobes on the distal end of the premenum in dragonflies and damselflies (Odonata) |
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Paired appendages attached to certain mouthparts of the insect. Usually visible on the underside of the head. |
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Lateral terminal lobes of the labium |
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Two protrusions that surround the anal opening from the rectal chamber |
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Living off of another organism while it is still alive |
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Having narrow parallel projections |
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The outside covering of the shell. |
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To whorl towards the apex in a flattened fashion |
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A permanent gas film held by the hairs of some insects while they are submerged |
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An organ found on some Collembola that is located behind the eyes and looks like a black dot |
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At or near the rear of the body |
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A horn-like appendage found on the ventral side of some Trichoptera, located just behind the head capsule and just above the where the first pair of legs connects to the thorax |
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Occurring near the end of a structure |
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Organisms that feed on animal matter |
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Distal segment of the labium in Odonata |
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Any appendage that acts like a leg but is not a leg; usually stubby, fleshy protuberances |
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Dorsal surface of the first thoracic segment |
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The first thoracic segment. |
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Teeth located on anterior part of shell. |
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A bump on the outside surface of a mussel shell. |
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| Q |
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Square or rectangular in shape |
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| R |
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Appendages which are modified for catching and holding prey |
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A long tube used to obtain air from the surface while and insect is submerged |
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| S |
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Organisms that feed on dead animal material |
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A portion of the body wall that has been hardened and is usually darker in color |
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A fingernail-shaped, colored structure found on some leeches on their dorsal surface, near the anterior end. |
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The posterior division of the notum |
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When viewing the snail from the front, with the apex at the top, the aperture will be located on the left. |
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An external opening along the body of insects used for air intake |
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Plates that are found on spiracles |
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The part of the shell that spirals up to the apex, but doesn't include the last whorl of the shell. |
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In Coleoptera larva a structure used to obtain oxygen from plants |
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Ventral plate of an abdominal segment |
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The segment of the maxilla just after the basal segment |
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A structure, usually made up of rows of comb-like teeth, on the sixth dorsal abdominal segment of the male Corixid. |
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In Ephemeroptera the fully winged form that precedes adults |
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Shallow depression on outside of shell. |
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| T |
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Claw located at the end of the tarsi |
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The number of segments of the tarsi, starting with the fore leg, then the middle leg, then the hind leg. For example, a tarsal formula of "5-5-4" means there are 5 segments in the fore leg's tarsi, 5 segments in the middle leg's tarsi, and 4 segments in the hind leg's tarsi.
The middle and hind legs of a 5-5-5 tarsal formula is shown in this photo. |
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The major leg segment furthest from the body; varies in number from 2 - 5 depending on the type of insect; they connect to the tibia and may have one or two claws on the end (tarsi is plural, tarsus is singular) |
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The leg segment furthest from the body; vary in number from 2 - 5 depending on the type of insect; they connect to the tibia and may have one or two claws on the end (tarsus is singular, tarsi is plural) |
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Dorsal plates of the abdomen |
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Referring to the posterior end of the body or the distal end of an appendage |
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Long and slender rod-like structure on the final abdominal segment |
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Organisms that are primarily found on land |
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Second major body segment of an insect |
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The fourth segment of an insect leg |
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A value from 0 through 10 rating an organism's tolerance to poor water quality.
Intolerant organisms are unable to survive poor water conditions. They have low values like 0, 1, or 2. Tolerant organisms will live in water of poor quality. Tolerant organisms have high values like 9 or 10. |
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Internal stemlike structures in insects |
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An appendage in Trichoptera larvae located anteriorly at the base of the fore leg |
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Position in the food chain in terms of how nutrients are acquired |
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Small mound-like projection on the body |
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| U |
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An open area at the center of the spiral of a snail shell. It is visible from underneath the shell when present. |
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| V |
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Bottom side of an organism |
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Running laterally along the ventral side of an insect |
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| W |
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