Fleas
SEM of a flea
Scientific classification
Domain: Eukaryota Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Siphonaptera Family: Pulicidae Genus: Xenopsylla Species: X. cheopsis
Binomial name
Xenopsylla cheopsis

The rat flea (Xenopsylla cheopsis) feeds from rodents, and is the most common cause for infection of the bubonic plague. This occurs when the flea has fed on an infected rodent, and then bites a human. Image File history File links Scanning Electron Micrograph of a Flea; public domain from http://phil. ... SEM Cambridge S150 at Geological Institute, University Kiel, 1980 SEM opened sample chamber The scanning electron microscope (SEM) is a type of electron microscope capable of producing high resolution images of a sample surface. ... Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. ... Kingdoms Animalia - Animals Fungi Plantae - Plants Protista Alternative Phylogeny Unikonta    Opisthokonta    Amoebozoa Bikonta    Apusozoa    Cabozoa       Rhizaria       Excavata    Corticata       Archaeplastida       Chromalveolata Animals, plants, fungi, and protists are eukaryotes (IPA: ), organisms with a complex cell or cells, where the genetic material is organized into a membrane-bound nucleus or nuclei. ... Animalia redirects here. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - trilobites (extinct) Subphylum Chelicerata Arachnida - spiders,scorpions, etc. ... Orders See taxonomy Insects (Class Insecta) are a major group of arthropods and the most diverse group of animals on the Earth, with over a million described species—more than all other animal groups combined. ... For the musician, a member of the Red Hot Chili Peppers, see Michael Balzary. ... In biology, binomial nomenclature is the formal method of naming species. ... Families Many, see text The order Rodentia is the most numerous of all the branches on the mammal family tree. ... Bubonic plague is the best-known variant of the deadly infectious disease plague, which is caused by the enterobacteria Yersinia pestis. ...

Body Parts

The rat flea has two eyes, yet it can only see very bright light. On the very tip of its head is a genial comb. Right behind the eyes are two short antennae. Behind the antennae is the pronotum and behind that lays the protonotal comb. Image File history File links Size of this preview: 589 × 600 pixelsFull resolution (643 × 655 pixel, file size: 115 KB, MIME type: image/jpeg) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Rat flea ... Image File history File links Size of this preview: 589 × 600 pixelsFull resolution (643 × 655 pixel, file size: 115 KB, MIME type: image/jpeg) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Rat flea ...

A flea's mouth has two functions: one for squirting saliva or partly digested blood into the bite, and one for sucking up blood from the host. This process mechanically transmits pathogens that may cause diseases the flea might have. Fleas smell exhaled carbon dioxide from humans and animals and jump rapidly to the source to feed on the newly found host. A flea is wingless so it can not fly, but it can jump long distances with the help of small powerful legs. A flea's leg consists of four parts. The part that is closest to the body is the coxa. Next is the femur, tibia and tarsus. A flea can use its legs to jump up to 200 times its own body length. It can also jump about 130 times its own height. A pathogen (literally birth of pain from the Greek παθογένεια) is a biological agent that can cause disease to its host. ...

The flea's body is only about one tenth of an inch. A flea's body is constructed to make it easier to jump long distances. The flea's body consists of three regions: head, thorax, and abdomen. The head and the thorax have rows of bristles (called combs) and the abdomen consists of eight visible segments.

Life Cycle

There are four stages in a flea's life. The first stage is the egg stage. Microscopic white eggs fall easily from the female to the ground or from the animal she lays on. If they are laid on an animal, they soon fall off in the dust or in the animals bedding. If the eggs do fall immediately on the ground, then they fall into crevices on the floor where they will be safe until they hatch one to ten days later (depending on the environment that they live in, it may take longer to hatch). When they finally hatch, the flea is a larva. The larva looks very similar to a worm that is about two millimeters long. It only has small body and a mouth part. (No arms or legs) At this stage, the flea does not drink blood; instead it eats dead skin cells, flea droppings, and other smaller parasites lying around them in the dust. When the larvae is mature it makes a silken cocoon around itself and pupates. This is when the flea spins a white, silken cocoon for itself. The flea stays in this stage from one week to six months changing in a process called metamorphosis. When the flea emerges, it begins the final cycle, called the adult stage. A flea can now suck blood from host and mate with other fleas. A single female flea can mate once and lay eggs every day with up to fifty eggs per day. Fleas like to live in an environment that is warm, where they can live up to a year.