Nesocheiridium Beier, 1957

Krajcovicova, Katarina, Matyukhin, Aleksandr Vladimirovich & Jana Christophoryova,, 2020, Two new pseudoscorpion species (Pseudoscorpiones, Chthoniidae, Cheiridiidae) from the Tonga Islands, Polynesia, with a redescription of the genus Nesocheiridium, ZooKeys 927, pp. 37-51 : 37

Nesocheiridium Beier, 1957

Diagnosis.

Small species, with adult body length ranging from 0.85 to 0.94 mm. Integument coarsely granulate, dorsally granuloreticulate. Vestitural setae relatively long, arcuate with a small spine, often covered by a fine exudate, giving them a leaf-like shape. Carapace narrowed towards anterior end, with short cucullus and a deep, submedian, transverse furrow. One pair of eyes. Cheliceral hand with four setae (seta ls absent), all acuminate. Galea long and slender, simple in male, with three terminal rami in female. Rallum of four blades, distal one enlarged and dentate. Ten abdominal tergites visible in dorsal view, I-IX divided. Ventral anal opening large and circular. Pedipalps densely and strongly granulate, including hand and the base of the fixed fingers, femur pedicellate. Fixed chelal finger with granulate swelling mesally, most distinct from ventro-lateral view. Chelal fingers slightly shorter than hand without pedicel. Venom apparatus present in both chelal fingers. Seven trichobothria present on fixed chelal finger, situated mainly in its basal half. Trichobothria ib and ist located distad of the granulate swelling, eb and esb situated close together subbasally. Moveable chelal finger with two trichobothria, situated in its basal half.

Remarks.

Nesocheiridium shares a combination of characters with most genera in the subfamily Cheiridiinae : reduced number of trichobothria on fixed chelal finger (seven at most) and moveable finger (two at most), four setae present on cheliceral hand, first blade of rallum enlarged, femur and patella of legs fused, tarsus of legs as about the same length as tibia ( Chamberlin 1931; Beier 1957). The present study confirms the characters mentioned by Beier (1957) to justify the genus Nesocheiridium , namely the short cucullus, presence of a granulate swelling on the fixed chelal finger, trichobothria ib and ist located distad of the granulate swelling, and eb and esb situated close together subbasally.