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Project Watershed Central New York

Dedicated to facilitating water resource education in Central New York

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Glossary		 OLTRDS

Exist in a Wide Range of Conditons

Beetle Larva

Exist in a Wide Range of Conditons
  • Up to 3/4” long
  • Body is long, hard, stiff and segmented
  • Six long segmented legs on upper middle section of body
  • Back end has two tiny hooks and short hairs (may be hard to see)
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    Crayfish

    Exist in a Wide Range of Conditons
  • They grow by shedding (“molting”) their shells
  • Often found hiding under rocks during the day and foraging on the stream bed during the night
  • Most live only two years, but some may live up to six or seven years
  • Up to six inches long
  • Eyes stand out from the body
  • Two or four antennae
  • Body covered with hard, platelike shell
  • Ten legs, two of these are large claws
  • Color is red, orange, brown
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    Clam

    Exist in a Wide Range of Conditons
  • Wide range of tolerances to pollution; some are very sensitive
  • Mussels have a long life span
  • Two hinged shells enclose soft bodies
  • Clams are smaller (3/4 inches) and more round than mussels
  • Clams are usually symmetrical with the umbo (highest point on the shell) equally distant from both ends
  • Mussels have a flat, oblong shell shape
  • Soft, fleshy body (foot) may be seen extending from shell
  • No eyes or distinct head
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    Cranefly Larva

    Exist in a Wide Range of Conditons
  • Develop over a period of six weeks to five years
  • Close to 300 species in North America
  • Usually live in the stream bed
  • Up to four inches long
  • Head is usually retracted so the front end appears round
  • Fleshy, plump, rounded segmented body
  • Its digestive track (internal organs) can be seen moving back and forth as it crawls
  • No legs
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    Damselfly Larva

    Exist in a Wide Range of Conditons
  • Develop over one to four years
  • Large eyes • Large scoop-like lower lip
  • No gills on the sides or underneath the abdomen
  • Six long segmented legs on upper middle section of body
  • Long spindly legs
  • Narrow body with three oar-shaped tails (gills) that look like fans
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    Dragonfly Nymph

    Exist in a Wide Range of Conditons
  • Develop over one to four year period
  • Large eyes
  • Large scoop-like lower lip
  • Wide oval or round abdomen that may end in three wedge-shaped extensions
  • No gills on the sides or underneath
  • Six long segmented legs on upper middle section of body
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    Scud

    Exist in a Wide Range of Conditons
  • They swim rapidly on their sides and are nicknamed “side swimmers”
  • Usually found where there are plants in the water
  • Seven pairs of tiny segmented legs
  • Two pairs of antennae
  • Color is white to clear
  • Resembles a freshwater shrimp
  • Hard, platelike shell except over the head and upper body
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    Sowbug

    Exist in a Wide Range of Conditons
  • Also called the pillbug
  • Approximately 130 freshwater species in North America
  • Large numbers of sowbugs indicate organic enrichment
  • Crawl slowly over surfaces
  • Up to 3/4 inches long
  • Seven pairs of legs
  • Dark brown to grey in color
  • Two pairs of antennae (one pair is much longer than the other)
  • Much wider than they are high and rather flat
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