the flea has a curios apparatus for sucking blood, which is very beautiful as examined with a microscope (Hooker, 1882).

Flea

the flea has a curios apparatus for sucking blood, which is very beautiful as examined with a microscope…

Fleas are parasites. That is any plant or animal which feeds upon another living plant or animal without destroying it.

Flea

Fleas are parasites. That is any plant or animal which feeds upon another living plant or animal without…

Fleas are parasites. That is any plant or animal which feeds upon another living plant or animal without destroying it.

Flea

Fleas are parasites. That is any plant or animal which feeds upon another living plant or animal without…

Water fleas are microscopic crustaceans, otherwise known as Daphnia.

Water Flea

Water fleas are microscopic crustaceans, otherwise known as Daphnia.

Water fleas are microscopic crustaceans, otherwise known as Daphnia.

Water Flea

Water fleas are microscopic crustaceans, otherwise known as Daphnia.

Water fleas are microscopic crustaceans, otherwise known as Daphnia.

Water Flea

Water fleas are microscopic crustaceans, otherwise known as Daphnia.

The Copepoda are represented by the cyclops, or water flea. This form is common in sluggish streams and ditches. This is a female with egg sacs.

Water Flea

The Copepoda are represented by the cyclops, or water flea. This form is common in sluggish streams…

The water flea known as Cypris.

Water Flea

The water flea known as Cypris.

The water flea known as Daphnia.

Water Flea

The water flea known as Daphnia.

The water flea known as Cyclops.

Water Flea

The water flea known as Cyclops.

The type of flea that dogs get.

Dog Flea

The type of flea that dogs get.

Adult human flea, magnified twenty-two times.

Adult Human Flea

Adult human flea, magnified twenty-two times.

"Aphaniptera includes the fleas, which, despite their minuteness, have made themselves a name in the world. The arterial covering is a horny compound of very distinct segmentsl the wings are four, but nearly rudimentary; the suctional organs consist of a pair of fine, serrated, sword-shaped mandibles, provided with a sharp, needle-like spear for penetrating the skin of the victim." — Goodrich, 1859

Flea

"Aphaniptera includes the fleas, which, despite their minuteness, have made themselves a name in the…

"Water Flea is a popular name for minute aquatic Crustaceans such as daphnia, cypris, and cyclops. In Cyclops the body is more distinctly segmented and the shell is not bivalve; the head bears antennæ, mandibles, and maxillæ, and the first five segments of the thorax bear swimming appendages. Water fleas fed on microscopic plants and animals and on organic debris, while they themselves– often occurring in countless swarms– form an important part of the food supply of certain fishes."—(Charles Leonard-Stuart, 1911)

Cyclops communis Water Flea

"Water Flea is a popular name for minute aquatic Crustaceans such as daphnia, cypris, and cyclops. In…

"Water Flea is a popular name for minute aquatic Crustaceans such as daphnia, cypris, and cyclops. In Cypris also the shell is bivalve; there are five pairs of appendages on the head and two on the body; most of these are used in swimming or creeping. Among cyprids parthenogenesis again occurs, and in some species males have never been observed, while parthenogenetic development has been traced for as many as 40 successive generations. The females bear large egg sacs. Water fleas fed on microscopic plants and animals and on organic debris, while they themselves– often occurring in countless swarms– form an important part of the food supply of certain fishes."—(Charles Leonard-Stuart, 1911)

Cypris Unifasciata Water Flea

"Water Flea is a popular name for minute aquatic Crustaceans such as daphnia, cypris, and cyclops. In…

"Water Flea is a popular name for minute aquatic Crustaceans such as daphnia, cypris, and cyclops. The common Daphnia pulex, abundant in fresh water, is a good representative. The body is enclosed in a bivalve shell; there is a large single eye; a pair of large antennæ are used as swimming organs. The daphnids are marvellously prolific, and for prolonged periods parthenogenetic. There is an interesting difference between the winter eggs which require fertilization and the summer eggs which do not. The females have a dorsal brood chamber betwen the shell and the back. Water fleas fed on microscopic plants and animals and on organic debris, while they themselves– often occurring in countless swarms– form an important part of the food supply of certain fishes."—(Charles Leonard-Stuart, 1911)

Daphnia Pulex Water Flea

"Water Flea is a popular name for minute aquatic Crustaceans such as daphnia, cypris, and cyclops. The…

A very small insect destructive to vegetation.

Striped Flea

A very small insect destructive to vegetation.

"The water fleas just visible to the naked eye are present in nearly all waters and become very abundant in stagnant water." —Davison, 1906

Daphnia

"The water fleas just visible to the naked eye are present in nearly all waters and become very abundant…

Cat and dog flea.

Flea

Cat and dog flea.

Distinct by their usually small size, their intense black colors, which occasionally have a bluish greenish tinge, and by their very convex form.

Black Bug

Distinct by their usually small size, their intense black colors, which occasionally have a bluish greenish…

<em>Sarcopsylla penetrans</em>-Female distended with eggs

Jigger flea

Sarcopsylla penetrans-Female distended with eggs

Grape flea-beetle; larva.

Beetle

Grape flea-beetle; larva.

Grape flea-beetle; adult.

Beetle

Grape flea-beetle; adult.

Grape flea-beetle; hind leg.

Beetle

Grape flea-beetle; hind leg.

Grape flea-beetle, of the Haltica chalybea species; in all its stages, on a grape shoot.

Beetle

Grape flea-beetle, of the Haltica chalybea species; in all its stages, on a grape shoot.

Pale-stripped flea-beetle, Systema blanda species.

Beetle

Pale-stripped flea-beetle, Systema blanda species.

The adult beetle.

Adult Beetle

The adult beetle.

The larva of a beetle.

Beetle Larva

The larva of a beetle.

The pupa of a beetle.

Beetle Pupa

The pupa of a beetle.

Of the Composite family (Compositae), the common fleabane (Erigeron philadelphicus).

Common Fleabane

Of the Composite family (Compositae), the common fleabane (Erigeron philadelphicus).

A magnified image of a flea.

Flea

A magnified image of a flea.

"The common Flea has an oval body, somewhat flattened, and covered with a rather horay skin."

Flea (Pulex Irritans)

"The common Flea has an oval body, somewhat flattened, and covered with a rather horay skin."

The human flea (Pulex irritans) is a parasitic insect that actually has several hosts despite its name.

Human Flea

The human flea (Pulex irritans) is a parasitic insect that actually has several hosts despite its name.

The chigoe flea (Tunga penetrans) is a parasitic arthropod found in tropical climates, especially South America and the West Indies. At 1 mm long, the chigoe flea is the smallest known flea. Breeding female chigoes burrow into exposed skin and lay eggs, causing intense irritation. After this point, the skin lesion looks like a 5 to 10 mm white spot with a central black dot, which are the flea's exposed hind legs, respiratory spiracles and reproductive organs.

Chigoe Flea (Male)

The chigoe flea (Tunga penetrans) is a parasitic arthropod found in tropical climates, especially South…

The chigoe flea (Tunga penetrans) is a parasitic arthropod found in tropical climates, especially South America and the West Indies. At 1 mm long, the chigoe flea is the smallest known flea. Breeding female chigoes burrow into exposed skin and lay eggs, causing intense irritation. After this point, the skin lesion looks like a 5 to 10 mm white spot with a central black dot, which are the flea's exposed hind legs, respiratory spiracles and reproductive organs.

Chigoe Flea (Female)

The chigoe flea (Tunga penetrans) is a parasitic arthropod found in tropical climates, especially South…

An illustration of the larva of a common flea. Flea larvae emerge from the eggs to feed on any available organic material such as dead insects, feces and vegetable matter. They are blind and avoid sunlight, keeping to dark places like sand, cracks and crevices, and bedding. Given an adequate supply of food, larvae should pupate within 1-2 weeks. After going through three larval stages they spin a silken cocoon.

Flea Larva

An illustration of the larva of a common flea. Flea larvae emerge from the eggs to feed on any available…

An illustration of the pupa of a common flea. After going through three larval stages they spin a silken cocoon. After another week or two the adult flea is fully developed and ready to emerge from the cocoon. They may however remain resting during this period until they receive a signal that a host is near - vibrations (including sound), heat and carbon dioxide are all stimuli indicating the probable presence of a host. Fleas are known to overwinter in the larval or pupal stages.

Flea Pupa

An illustration of the pupa of a common flea. After going through three larval stages they spin a silken…

An illustration of a common flea. Once the flea reaches adulthood its primary goal is to find blood - adult fleas must feed on blood in order to reproduce. Adult fleas only have around a week to find food once they emerge, though they can survive two months to a year between meals. A flea population is unevenly distributed, with 50 percent eggs, 35 percent larvae, 10 percent pupae and 5 percent adults. Their total life cycle can take as little as two weeks, but may be lengthened to many months if conditions are unfavorable. Female fleas can lay 500 or more eggs over their life, allowing for phenomenal growth rates.

Flea

An illustration of a common flea. Once the flea reaches adulthood its primary goal is to find blood…

The human flea (Pulex irritans) is a parasite in the the Siphonaptera order of fleas.

Human Flea

The human flea (Pulex irritans) is a parasite in the the Siphonaptera order of fleas.

The Grapevine Flea Beetle (Altica chalybea). "a, leaf infested with larvae; b, larva; c, cocoon; d, beetle." -Whitney, 1911

Grapevine Flea Beetle

The Grapevine Flea Beetle (Altica chalybea). "a, leaf infested with larvae; b, larva; c, cocoon; d,…

The Blackberry Psyllid (Trioza tripunctata) is an insect that feeds on specific plants.

Blackberry Psyllid

The Blackberry Psyllid (Trioza tripunctata) is an insect that feeds on specific plants.

The marine isopod or sand flea (Gammarus) is in the sand, under rocks, and in the seaweed. Many are parasitic upon fishes. Gammarus is an amphipod crustacean genus in the family Gammaridae.

Marine Isopod

The marine isopod or sand flea (Gammarus) is in the sand, under rocks, and in the seaweed. Many are…

The marine isopod or sand flea (Caprella) is an omnivorous feeder that eats detritus, one-celled plants, small invertebrates. It is preyed upon by shrimp, sea anemones and several fish species. Females of some species of skeleton shrimp apparently kill the males after mating using a poisonous claw.

Marine Isopod

The marine isopod or sand flea (Caprella) is an omnivorous feeder that eats detritus, one-celled plants,…

An illustration of a group of fleas doing various activities seen in a circus. Some fleas are pulling a carriage with fleas inside, some are riding bicycles, and some look like they are racing each other.

Flea Circus

An illustration of a group of fleas doing various activities seen in a circus. Some fleas are pulling…

An illustration of five fleas dancing on a platform. Two fleas are dancing together as a pair and the other four fleas are flying off of the platform.

Flea Dance

An illustration of five fleas dancing on a platform. Two fleas are dancing together as a pair and the…

An illustration of four fleas competing in a hurdle-race. The flea in first place is crawling under a hurdle and grabbing a flag.

Flea Race

An illustration of four fleas competing in a hurdle-race. The flea in first place is crawling under…

An illustration of a flea dressed in a uniform walking across a tight rope while holding a stick.

Flea Tight-Rope

An illustration of a flea dressed in a uniform walking across a tight rope while holding a stick.