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Furkula

Skakač iz rodu Isotoma. Furkula je nogam podobna struktura, ki izrašča iz zadka (na sliki vodoravno)

Furkula je dvorogim vilicam podoben izrastek četrtega člena zadka skakačev. Ima ga večina vrst skakačev, z njegovo pomočjo lahko ob nevarnosti razmeroma daleč skočijo. Vsebuje veliko elastičnih beljakovin in deluje po principu vzmeti. Ob mirovanju je furkula vpeta v strukturo na tretjem členu zadka, imenovano retinakulum. Ko retinakulum spusti furkulo, se ta bliskovito iztegne in požene žival v zrak. Da jo ponovno napne, mora žival uporabiti posebne mišice.

Skakači uporabljajo furkulo samo za beg pred plenilci, pri normalnem premikanju pa ne sodeluje.

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Furkula
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