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The Mesothelae are a suborder of spiders (order Araneae). As of April 2024 [update] , two extant families were accepted by the World Spider Catalog , Liphistiidae and Heptathelidae . Alternatively, the Heptathelidae can be treated as a subfamily of a more broadly circumscribed Liphistiidae.
Except for the primitive Mesothelae, of which the Liphistiidae are the sole surviving family, spiders have the much more centralized nervous system that is typical of arachnids: all the ganglia of all segments behind the esophagus are fused, so that the cephalothorax is largely filled with nervous tissue and there are no ganglia in the abdomen ...
Paintings of Araneus angulatus from Svenska Spindlar of 1757, the first major work on spider taxonomy. Spider taxonomy is the part of taxonomy that is concerned with the science of naming, defining and classifying all spiders, members of the Araneae order of the arthropod class Arachnida, which has more than 48,500 described species. [1]
Qiongthela ranges in size from 13-31mm in length (excluding the chelicerae). The male's palp has a long, blade-like conductor with a slightly hook-like apex. The tegulum has two margins and the paracymbium is spinose. Females have two paired receptacular clusters, situated on the anterior edge of the bursa copulatrix.
The cephalothorax, also called prosoma, is composed of two primary surfaces: a dorsal carapace and a ventral sternum.Most external appendages on the spider are attached to the cephalothorax, including the eyes, chelicerae and other mouthparts, pedipalps and legs.
Pages in category "Mesothelae" The following 2 pages are in this category, out of 2 total. This list may not reflect recent changes. ...
However, in the Mesothelae, which are regarded as the most basal living spiders, the ganglia of the opisthosoma and the rear part of the prosoma remain unfused, [32] and in scorpions the ganglia of the cephalothorax are fused but the abdomen retains separate pairs of ganglia.
The Araneomorphae (also called the Labidognatha or "true spiders" [1]) are an infraorder of spiders.They are distinguishable by chelicerae (fangs) that point diagonally forward and cross in a pinching action, in contrast to the Mygalomorphae (tarantulas and their close kin), where they point straight down.