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Between 2015 and 2019 six genera of Mesothele spider in four families were described from Late Cretaceous aged Burmese Amber in Myanmar. Cretaceothele [21] (Cretaceothelidae) Burmathele [22] (Burmathelidae), Parvithele, Pulvillothele (Parvithelidae) [22] Intermesothele and Eomesothele (Eomesothelidae) [23]
Spiders have developed several different respiratory anatomies, based either on book lungs or on tracheae. Mesothele and mygalomorph spiders have two pairs of book lungs filled with haemolymph, where openings on the ventral surface of the abdomen allow air to enter and oxygen to diffuse in and carbon dioxide to diffuse out.
This applies in particular to the "median apophysis". In mesothele spiders, whose palpal bulbs have the same basic structure as those of entelegyne spiders, the name contrategulum has been used in preference to "median apophysis" for the sclerite immediately following (distal to) the tegulum. [15] Diagram of palpal bulb components
Palaeothele is an extinct genus of mesothele spiders, with only one known species Palaeothele montceauensis. [1] Two fossils were found at Montceau-les-Mines , France, in ironstone concretion deposits of Late Carboniferous ( Stephanian ) age, about 304 to 299 million years ago .
Heptathelidae is a family of spiders. [1] It has been sunk within the family Liphistiidae as the subfamily Heptathelinae, [2] but as of April 2024 was accepted by the World Spider Catalog. [1] It is placed in suborder Mesothelae, which contains the most basal living spiders.
Spiders in the suborder Mesothelae belong to the order Araneae (Spiders). Subcategories. This category has the following 3 subcategories, out of 3 total. G.
Haplogyne: A spider whose female lacks an epigyne and in which the same ducts are used to transport sperm to the uterus and to the spermathecae; [15] see entelegyne; see also Haplogynae Heart mark : A narrow marking along the top of the abdomen roughly corresponding to the location of the heart
The internal anatomy of a typical female two-lunged spider. The yellow items signify portions of the digestive system, red indicates the circulatory system, blue is the nervous system, pink is the respiratory system, and purple is the reproductive system. Lastly, the spinnerets and poison glands are shown in green.