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25 novembre 2009 | 
Autore: I NEMATODI – Prima parte -
I nematodi, o vermi cilindrici, costituiscono il phylum più ampio degli pseudocelomati (12000 specie descritte; forse 500.000 quelle esistenti). Nematodi a vita libera sono presenti nel mare, nelle acque dolci e nel terreno; molte specie conducono vita parassitaria.
I nematodi sono ubiquitari, essendo presenti nelle regioni polari, nei tropici, nei deserti, montagne, grandi profondità marine. Alcuni occupano habitat acquatici particolari, che comprendono sorgenti calde (nelle quali la temperatura può raggiungere 53 °C) .
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Enterobius vermicularis
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Pubblicato in Animalia, Classificazione degli animali | 
Tag: animali, animalia, ascaridi, aschelminti, filogenesi, nematodi, ossiuri, parassiti, parassitologia, pseudocelomati, regni, scienze naturali, tassonomia, taxa, Zoologia
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- Frogs, salamanders and climate changeIncreasingly erratic rainfall patterns can lead to declines in southeastern frog and salamander populations, but protecting ponds can improve their plight. […]
- Attacking MRSA with metals from antibacterial claysMedical researchers have come up with a new approach for developing effective, topical antibacterial agents -- one that draws on a naturally occurring substance recognized since antiquity for its medicinal properties: clay. […]
- Now we know why old scizophrenia medicine works on antibiotics-resistant bacteriaAn old medicine for schizophrenia is effective at treating something completely different than it was designed for: antibiotic-resistant bacteria. So far it has been a mystery how this old schizophrenia medicine works, but now researchers have figured it out. This can lead to a new medicine against the increasingly threatening antibiotic-resistant bacteria. […]
- Invasive species: 'away-field advantage' weaker than ecologists thoughtFor decades, ecologists have assumed the worst invasive species—such as brown tree snakes and kudzu—have an “away-field advantage.” They succeed because they do better in their new territories than they do at home. A new study reveals that this fundamental assumption is not nearly as common as people might think. […]
- Genome sequence of Tibetan antelope sheds new light on high-altitude adaptationHow can the Tibetan antelope live at elevations of 4,000-5,000m on the Qinghai-Tibetan Plateau? Investigators now provide evidence of genetic factors that may be associated with the species' adaption to harsh highland environments. […]