File:An alien among the stars.jpg
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Italiano: Nell'immagine è presente un animale invertebrato chiamato Rotifera Bdelloidea, sono animali di acqua dolce e sono presenti anche in ambienti terrestri (principalmente umidi), grazie alla loro capacità di andare in anidrobiosi, stato di quiete in cui mantengono il ritmo del loro metabolismo al minimo possono sopravvivere anche in ambienti aridi. Il loro corpo consiste di tre regioni differenti: la testa, il tronco e il piede. La testa e il tronco sono retrattili e sulla testa è presente un rostro. Una caratteristica peculiare è la presenza di due dischi ciliati, detti tronchi, sui peduncoli che costituiscono quella che viene chiamata corona. Questi dischi rappresentano un apparato rotatorio usato per convogliare il cibo in bocca e per nuotare. Un'altra caratteristica degna di nota, anche in campo di ricerca riguardante l'evoluzione, è il fatto che non è stato mai osservato alcun maschio e le femmine si riproducono per partenogenesi, fatto molto importante se si pensa che grazie alla riproduzione sessuale abbiamo una sorta di ricombinazione genetica utile a rendere il genoma diverso e quindi vantaggioso per le specie. Allora come fanno a generare diversità genetica? Proprio grazie alla loro capacità di andare in anidrobiosi! Infatti con l'essicamento della membrana cellulare, questa può rompersi in alcuni punti lasciando penetrare materiale genetico di altri rotiferi, ma anche di altre specie come funghi, batteri e piante che una volta all'interno della cellula verrà incorporato. English: In the image there is an invertebrate animal called Rotifera Bdelloidea, they are freshwater animals and are also present in terrestrial environments (mainly humid), thanks to their ability to go into anhydrobiosis, a state of rest in which they maintain the rhythm of their metabolism at at least they can survive even in arid environments. Their body consists of three different regions: the head, the trunk and the foot. The head and trunk are retractable and there is a rostrum on the head. A peculiar characteristic is the presence of two ciliated discs, called trunks, on the peduncles that make up what is called the crown. These discs represent a rotary apparatus used to convey food into the mouth and for swimming. Another noteworthy characteristic, also in the field of research concerning evolution, is the fact that no male has ever been observed and females reproduce by parthenogenesis, a very important fact if we consider that thanks to sexual reproduction we have a sort of genetic recombination useful for making the genome different and therefore advantageous for the species. So how do they generate genetic diversity? Precisely thanks to their ability to go into anhydrobiosis! In fact, as the cell membrane dries out, it can break in some places, allowing genetic material from other rotifers to penetrate, but also from other species such as fungi, bacteria and plants which, once inside the cell, will be incorporated. |
| Date | |
| Source | Own work |
| Author | Alessandro Perrotti |
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This file was uploaded as part of Wiki Science Competition 2023. |
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| current | 13:32, 12 December 2023 | | 1,080 × 1,620 (232 KB) | Alessandro Perrotti (talk | contribs) | Uploaded own work with UploadWizard |
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