Female ? mm; male ? mm.
Chamberlin & Ivie, 1941.
Characters of genus:
Very closely related to the
genus. The differences between the genera
are not visible with a lens. Anterior row of eyes recurved, posterior straight. Chelicerae are provided with 3 large promarginal teeth and retromargin with 2 large teeth and 2 denticles (Almquist 2005). Endites are about twice as long as labium. Paracymbium sclerotized. The ventral markings sometimes consist of a broad dark median band flanked by reticulated narrow white bands.
Menge, 1866 (Long-jawed Orb Weavers).
Characters of family:
The tetragnathids belong to the group of ecribellate spider families having 8 eyes and 3 tarsal claws. Many members of the family are usually elongated spiders characterized by the often very long legs and chelicerae (subfamilies Tetragnathinae and Leucauginae). However there are some genera with oval abdomens or normal sized chelicerae (subfamily Metinae). Males are usually smaller and slimmer than females who often have the base of the abdomen swollen. Males often have relatively longer chelicerae than females and sometimes they are even longer than the carapace. The male chelicerae are also often furnished with spurs on their chelicerae, which are used to lock the female chelicerae during mating. The female palp is provided with a well-developed, toothed claw. The eyes are not unlike those of the araneids. They are subequal and arranged in 2 rows of 4 usually equidistant or with the medial eyes closer to each other than to the lateral eyes. The lateral eyes are either spaced apart or contiguous, sometimes situated on a tubercle. The primary eyes are always black. The secondary eyes of most genera are provided with a light-reflecting layer (tapetum) aiding nocturnal vision. However, tapetum is missing in a few genera such as
having all eyes black. The carapace is elongate and with short, shallow fovea (indistinct in
). The sternum is longer than wide and pointed at rear, sometimes protruding in between coxae IV. Narrow, horizontal sclerites are sometimes present between coxae and carapace. Endites are parallel and may either converge or dilate in front of the rebordered labium. The legs are long and slender and mostly with spines but in some genera there are none (for example
). The trichobothria are often branched. They are sometimes arranged in rows. The shape of the abdomen is variable sometimes round or oval but mostly elongate. Colours vary, quite often with bright white, green, red and yellow colours often with coppery or silvery blotches. Tetragnathids are entelegyne or secondary haplogyne (without epigyne). Sometimes the genital plate is not sclerotized (subfamily Tetragnathinae) and thus adult females may be difficult to separate from subadults and juveniles since there is no epigyne - just a hairy, tongue-shaped plate projecting posteriorly from the epigastric fold. The male palp is simple and often very similar within genera.
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