Piollo do corpo: Diferenzas entre revisións
traducido de en:Body louse |
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| Pediculus humanus humanus Linnaeus, 1758 | |||||||||||||||||||
O piollo do corpo humano, que pertence á subespecie Pediculus humanus humanus (tamén chamada Pediculus humanus corporis)[1] é un piollo (insecto da orde Phthriaptera) que infesta aos humanos e vive no seu corpo. Tamén se lle chama ás veces piollo da roupa. A infestación por piollos (piolos da cabeza, do corpo ou púbicos) chámase en xeral pediculose e a infestación polo piollo do corpo denomínase pediculosis corporis. A secuencia do xenoma do piollo do corpo foi publicada en 2010.[2][3] A diferenza do piollo da cabeza, que é inofensivo, o piollo do corpo pode transmitir efermidades infecciosas (de orixe bacteriana) como o tifus exantemático, febre das trincheiras e febres recorrentes.
Ciclo vital e morfoloxía
Pediculus humanus humanus (the body louse) is indistinguishable in appearance from Pediculus humanus capitis (the head louse) but will interbreed only under laboratory conditions. In their natural state, they occupy different habitats. In particular, body lice have evolved to attach their eggs to clothes, whereas head lice attach their eggs to the base of hairs.
The life cycle of the body louse consists of three stages: egg (also called a nit), nymph, and adult.[Cómpre referencia]
- Nits are louse eggs. They are generally easy to see in the seams of an infested person's clothing, particularly around the waistline, under armpits or even in body hair. They are oval and usually yellow to white in color. Body lice nits may take 1–2 weeks to hatch.
- A nymph is an immature louse that hatches from the nit (egg). A nymph looks like an adult body louse, but is smaller. Nymphs mature into adults about 9–12 days after hatching. To live, it must feed on blood.
- The adult body louse is about the size of a sesame seed (2.5–3.5 mm), has six legs, and is tan to greyish-white. Females lay eggs. To live, lice must feed on blood. If separated from their hosts, lice die at room temperature.
Orixe
The body louse diverged from the head louse at around 100,000 years ago, hinting at the time of the origin of clothing.[4][5][6] Body Lice were first described by Carl Linnaeus in the 10th edition of Systema Naturae. [Cómpre referencia]
Notas
- ↑ Buxton, Patrick A. (1947). "The Anatomy of Pediculus humanus". The Louse; an account of the lice which infest man, their medical importance and control (2nd ed.). London: Edward Arnold. pp. 5–23.
- ↑ Pittendrigh, B.R., et al (2006). Proposed sequencing of a new target genome: the human body louse, Pediculus humanus humanus. J. Med. Entom. 43(6): 1103–1111.
- ↑ Kirkness et al. (2010). "Genome sequences of the human body louse and its primary endosymbiont provide insights into the permanent parasitic lifestyle." PNAS 107(27): 12168-12173.
- ↑ Ralf Kittler, Manfred Kayser & Mark Stoneking (2003). "Molecular evolution of Pediculus humanus and the origin of clothing" (PDF). Current Biology 13 (16): 1414–1417. PMID 12932325. doi:10.1016/S0960-9822(03)00507-4.
- ↑ Stoneking, Mark. "Erratum: Molecular evolution of Pediculus humanus and the origin of clothing". Consultado o March 24, 2008.
- ↑ "...Lice Indicates Early Clothing Use ...", Mol Biol Evol (2011) 28 (1): 29–32.
Véxase tamén
Outros artigos
Ligazóns externas
- Body and head lice on the UF / IFAS Featured Creatures Web site