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The earliest known fleas lived in the Middle Jurassic; modern-looking forms appeared in the Cenozoic. Fleas probably originated on mammals first and expanded their reach to birds. Each species of flea specializes, more or less, on one species of host: many species of flea never breed on any other host; some are less selective.
The most infamous flea-to-human transmitted disease is the bubonic plague, which was caused by the bacterium Yersinia pestis. ... (0.04 to 0.15 inches), wingless, blood-sucking fleas that live on ...
Gravitaxis (known historically as geotaxis) is the directional movement (along the vector of gravity) to the center of gravity. The planktonic larvae of a king crab , Lithodes aequispinus , combine positive phototaxis (movement towards the light) and negative gravitaxis (upward movement). [ 16 ]
The human flea (Pulex irritans) – once also called the house flea [1] – is a cosmopolitan flea species that has, in spite of the common name, a wide host spectrum. It is one of six species in the genus Pulex ; the other five are all confined to the Nearctic and Neotropical realms . [ 2 ]
Tunga penetrans is a species of flea also known as the jigger, jigger flea, chigoe, chigo, chigoe flea, chigo flea, nigua, sand flea, or burrowing flea. It is a parasitic insect found in most tropical and sub-tropical climates. In its parasitic phase it has significant impact on its hosts, which include humans and certain other mammalian species.
Other larvae show negative phototaxis by swimming away from the light. First, the light comes from left and then from the right side. When the light direction is switched the larvae turn. The side where the light is coming from is indicated by a white bar. The larvae display mixed phototaxis, some negatively phototactic larvae are tracked.
This may attract night-flying insects and aid in spore dispersal, but other functions may also be involved. [49] Quantula striata is the only known bioluminescent terrestrial mollusk. Pulses of light are emitted from a gland near the front of the foot and may have a communicative function, although the adaptive significance is not fully ...
Fleas can be drowned by immersion for about 24 hours; they may appear to be dead if immersed for shorter times, but can revive after some hours. [11] Soaps and surfactants can facilitate the death of fleas in bathing. The process of washing the flea (and the pet) removes integumental waxes on the flea's body and it dies from dehydration. [12 ...
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related to: light that attracts fleas to humans is known as the process