Collembola, commonly known as springtails, are small wingless arthropods that use a furcula, or springing organ, to jump. They lack eyes and have four segmented antennae. An adhesive collophore on their first abdominal segment helps with water balance. A retinaculum holds the furcula beneath their body. Malpighian tubules and tracheal systems are usually absent. Diplura are also small soft-bodied soil-dwelling insects that feed on dead organic matter. They have many segmented antennae and chewing mouthparts. Paired appendages are present on their abdominal segments and their tarsi are one segmented.