A new and endangered species of the pseudoscorpion genus Lagynochthonius from a cave in Vietnam, with notes on chelal morphology and the composition of the Tyrannochthoniini (Arachnida, Chelonethi, Chthoniidae)

摘要: Lagynochthonius fragilis n. sp. is described from a limestone cave in the Hong Chong karst of Kien Giang Province, southern Vietnam, which currently threatened by quarrying activities. This first record troglomorphic species Beier, 1951 continental Asia. The presence chemosensory setae on dorsum chelal palm interpreted as synapomorphy tribe Tyrannochthoniini Chamberlin, 1962. New Zealand genus Maorichthonius 1925 transferred Chthoniini Daday, 1888 to Tyrannochthoniini. Tyrannochthoniella 1966, also endemic Zealand, assigned 1888. Stygiochthonius Carabajal Marquez, Garcia Carrillo & Rodriguez Fernandez, 2001, Spain, synonymized with Paraliochthonius 1956 (n. subj. syn.). Five new combinations are proposed: ovatus Vitali-di Castri, 1984 (ex Tyrannochthonius); barrancoi (Carabajal 2001) Stygiochthonius); P. curvidigitatus (Mahnert, 1997) Lagynochthonius); setiger and superstes 1986) Tyrannochthonius). A key given genera parallel evolution several groups pseudoscorpions characteristic morphology, here termed lagyniform, discussed. designations proposed for spot-sensilla fingers. so-called ‘sensorium’ near tip fixed finger shown be modified tooth that has migrated dorsally dental margin. term rallum introduced replacement inappropriate ‘flagellum’, applied cheliceral blades pseudoscorpions. bothridial vestibulum internal cuticular sheath at base bothridia trichobothria. est decrit d’une grotte calcaire de la province Giang, au sud du actuellement menacee par une exploitation carriere. Elle premiere espece troglomorphe genre connue l’Asie continentale. La des soies chemosensorielles sur main pince interpretee comme synapomorphie tribu Le neo-zelandais transfere Daday egalement endemique Nouvelle Zelande, attribue l’Espagne, mis en synonymie avec syn. subj.). Cinq combinaisons nouvelles sont proposees : Tyrannochthonius) ; Stygiochthonius) Lagynochthonius) et Une cle determination genres fournite. L’evolution parallele facies caracteristiques pince, ici qualifie “ lagyniforme ”, evoquee chez plusieurs groupes Desnouveaux sigles proposes pour les sensilles punctiformes doigts pince. Il demontre que le sensorium ” l’extremite doigt fixe especes dent modifiee qui migre dorsalement marge dentale. terme inapproprie flagelle dans sens son application aux lames cheliceriennes pseudoscorpions, remplace rallum. nouveau vestibule trichobothriale introduit gaine cuticulaire bothridies trichobothries.