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Cheiracanthium, commonly called yellow sac spiders, is a genus of araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. [4] They are usually pale in colour, and have an abdomen that can range from yellow to beige.
In early summer C. erraticum builds a retreat made from two or three leaves or grass heads which are stitched together to hold the female and her egg sac. Later in the year, the immature spiders, which are already showing the reddish median stripe on the abdomen, can be found in small silk cells on plant stems.
Cheiracanthium punctorium, one of several species commonly known as the yellow sac spider, is a spider found from central Europe to Central Asia.They reach a length of about 15 mm, and their bite can penetrate human skin; the bite has been compared to a wasp sting, perhaps a bit more severe, although susceptible persons can have stronger reactions, like nausea. [1]
Desert Spider, Stegodyphus lineatus, one of the best-described species that participates in matriphagy Matriphagy is the consumption of the mother by her offspring. [1] [2] The behavior generally takes place within the first few weeks of life and has been documented in some species of insects, nematode worms, pseudoscorpions, and other arachnids as well as in caecilian amphibians.
Cheiracanthium gratum is a spider species found in Germany and Hungary. It is pale yellow, with males growing to 5.6-6.5 mm in length and females 6.7-7 mm. [1]
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Cheiracanthium abbreviatum is a spider species found in France and Denmark. [ 1 ] The species was first described in 1878 by Eugène Simon , [ 1 ] based on a single female specimen caught in the dunes of Cap Ferret under Mediterranean strawflower ( Helichrysum stoechas ) shrubbery. [ 2 ]
X-ray showing the skeleton of Typhlonectes (Typhlonectidae). Caecilians' anatomy is highly adapted for a burrowing lifestyle. In a couple of species belonging to the primitive genus Ichthyophis vestigial traces of limbs have been found, and in Typhlonectes compressicauda the presence of limb buds has been observed during embryonic development, remnants in an otherwise completely limbless body. [7]