The head of the Arthroplean springtails is distinct from the thorax and surmounted by a pair of antennas possessing several articles. In addition to the mouthparts and antennas, the latter has three types of external sensory receptors

 

This article is based on a study "Biomimetic coating-free surfaces for long-term entrapment of air wetting liquids" conducted by a team of researchers from the Science and Technology Division of King Abdullah University in Saudi Arabia. I chose to present this work because it illustrates...


Their bodies are picked up and globular. The first four abdominal segments are fused to the thoracic segments and constitute the large abdominal, the last two abdominal segments forming the small abdominal. The antennas are longer than the head.

The cuticle is with the springtails what the skin is to the human, but the comparison stops there because this thin film which covers the whole body of a springtail has astonishing properties. Regarding its constitution, if we refer to the right part of the diagram below, 

Springtails are animals ranging in size from approximately 0.12 mm to 17 mm. They have a head, a chest consisting of three segments and an abdomen that includes six. The head carries antennas, the thorax has three pairs of legs and the abdomen has a jumping organ called furca and other organs with specific functions

This organ, which is specific to springtails, is used to make jumps to escape predators or to quickly leave the environment in which they live, for example to escape a current of water that could lead them. Although in some cases able to control the direction in which


This illustration shows the end of an Isotoma leg (Entomobryomorph). There are three pairs, the legs are attached to the three thoracic segments. Springtailsuses them to move, but also for other operations such as the toilet.

The antennas of springtails adopt various forms as shown by the images at the end of the article, but as for other organs their constitution, whatever the families, have similar characters or similar (among others four segments). They are particularly well endowed with sensory structures

The mouthparts are not visible because they are embedded in a cavity (This is among other features distinguishing springtails from insects). The species thus defined are described as enthroned. Oral parts play a very important role in the identification and classification of species

Also called ventral tube, it is located on the first abdominal segment (above, images made with an electron microscope) More or less elongated according to the group (generally longer in Symphypleones), it consists of a ventral tube and carries at its base a pair of thin-walled excretile vesicles

The full bristles and the sensory bristles (sensilla) play several roles, respectively that of protection or ornament and for the innervated bristles, the role of mechanical receiver but also for some of them that of chemoreceptor. In order to better understand the functional difference between a

Reproduction of springtails can, depending on the species, be sexed (male + female) or asexual (parthenogenesis). Considered primitive animals, some of them reveal evolved behavior, varied and adapted to various biotopes

Springtails do not have compound eyes, as is the case with almost all insects. Their vision is made from a group of simple or ocellated eyes grouped in the ocular plates and whose number and disposition vary according to the species