ClipArt ETC
Circulatory and respiratory system of the crayfish. C-heart with three pairs of ostia; Ps, pericardium; Ac, cephalic aorta; A, ab, abdominal aorta; As, sternal artery. The arrows indicate the direction of the flow.

Circulatory and Respiratory System of a Crayfish

Circulatory and respiratory system of the crayfish. C-heart with three pairs of ostia; Ps, pericardium;…

"The anterior feet are about the length of the body. The other feet terminate in an elongated claw, which is straight-pointed."

Corystes Cassivelaunus, female

"The anterior feet are about the length of the body. The other feet terminate in an elongated claw,…

"Crawfish, or Crayfish is a name of various crustaceous animals, the common crawfish being the river lobster. It lurks under stones or in holes in the banks. Its food consists of small mollusks or fishes, the larvæ of insects, and almost any sort of animal matter. Some crawfish by their burrowing habits injure mill-dams and the levees of the Mississippi."—(Charles Leonard-Stuart, 1911)

Crawfish

"Crawfish, or Crayfish is a name of various crustaceous animals, the common crawfish being the river…

"River-Crawfish (Astacus fluviatilis). (From Huxley's "Crayfish.")"- Whitney, 1902

Crawfish

"River-Crawfish (Astacus fluviatilis). (From Huxley's "Crayfish.")"- Whitney, 1902

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are closely related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. Most crawfish cannot tolerate polluted water, although some species such as the invasive Procambarus clarkii are more hardy. Some crayfish have been found living as much as 3 m (10 feet) underground.

Crawfish

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they…

Cross-section of abdomen of crayfish.

Crayfish

Cross-section of abdomen of crayfish.

Longitudinal-section of a crayfish, showing digestive, circulatory, reproductive, excretory, and nervous systems.

Crayfish

Longitudinal-section of a crayfish, showing digestive, circulatory, reproductive, excretory, and nervous…

Nervous system of crayfish.

Crayfish

Nervous system of crayfish.

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are probably closely related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. Most crayfish cannot tolerate polluted water, although some species such as the invasive Procambarus clarkii are more hardy. Some crayfish have been found living as much as 3 m (10 feet) underground.

Crayfish

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they…

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators

Crayfish

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they…

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. This disscetion of a crayfish shows the following: (b) brain, (h) heart, (i) intestine, (k) kidney, (l) liver, (n) nerve cord, (r) reproductive organ, (s) stomach.

Crayfish

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they…

A, section through the compound eye of a crayfish. Labels: 1, cornea; 2, crystaline cones; 3, retinulae; 4, pigment cells; 5, cuticle; 6, epithelium; n, optic nerve; g, ganglia. B, A single element (ommatidium) from the compound eye of a crayfish. Labels: 1, corneal lens; 2, corneal cells; 3, crystalline cone cells; 4, 5, outer and inner parts of the crystalline cone; p, pigment cells; r, retinula; R, rhabdome; b, basement membrane.

Eye of a Crayfish

A, section through the compound eye of a crayfish. Labels: 1, cornea; 2, crystaline cones; 3, retinulae;…

"Norway Lobsters have the eyes uniform and the two last rings of the thorax movable."

Nephrops Norvegicus

"Norway Lobsters have the eyes uniform and the two last rings of the thorax movable."

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs seek out a shell to inhabit and will kill a living mollusk to take its home.

Pagurus Bernhardus, In the Shell

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs…

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs seek out a shell to inhabit and will kill a living mollusk to take its home.

Pagurus Bernhardus, Out of the Shell

"The Hermit or Soldier Crab is perhaps the oddest and most curious of the Crustaceans." Hermit Crabs…

A small crustacean about 3 to 4 inches in length and marketed in vast numbers. Ate throughout the world.

Prawn

A small crustacean about 3 to 4 inches in length and marketed in vast numbers. Ate throughout the world.

"Alpheus-A genus of macrurous decapodous crustaceans, the type of the family Alpheidæ."-Whitney, 1902

Red Shrimp

"Alpheus-A genus of macrurous decapodous crustaceans, the type of the family Alpheidæ."-Whitney,…

Shrimp are a marine crustacean largely used as food.

Shrimp

Shrimp are a marine crustacean largely used as food.

"Types of spermatozoa. A, from the round worm (Ascaris) with a cap, somewhat amaeboid; B, from the Crayfish, with numerous projections; C, from Frog; D, from Sea-urchin. h, head; m, middle piece; n, nucleus; t, tailor flagelium." — Galloway

Spermatozoa

"Types of spermatozoa. A, from the round worm (Ascaris) with a cap, somewhat amaeboid; B, from the Crayfish,…