Definition: The word "Anielidae" refers to an order in the phylum Annelida, a group of arthropods that includes ants and millipedes. This order contains about 4,700 species, known for their remarkable adaptability and the unique structure they possess called a 'vena cava.' The word "veina" is the Greek word meaning vein or cavity; it's where food feeds into the body of an arthropod. In terms of anatomy, ants and millipedes have a similar system of chambers and pores within their bodies to help them extract food.
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