Abstract
Lagynochthonius fragilis n. sp. is described from a limestone cave in the Hong Chong karst of Kien Giang Province, southern Vietnam, which is currently threatened by quarrying activities. This is the first record of a troglomorphic species of Lagynochthonius Beier, 1951 from continental Asia. The presence of chemosensory setae on the dorsum of the chelal palm is interpreted as a synapomorphy of the tribe Tyrannochthoniini Chamberlin, 1962. The New Zealand genus Maorichthonius Chamberlin, 1925 is transferred from the Chthoniini Daday, 1888 to the Tyrannochthoniini. The genus Tyrannochthoniella Beier, 1966, also endemic to New Zealand, is assigned to the tribe Chthoniini Daday, 1888. The genus Stygiochthonius Carabajal Márquez, García Carrillo & Rodríguez Fernández, 2001, from southern Spain, is synonymized with Paraliochthonius Beier, 1956 (n. subj. syn.). Five new combinations are proposed: Lagynochthonius ovatus Vitali-di Castri, 1984 (ex Tyrannochthonius); Paraliochthonius barrancoi (Carabajal Márquez, García Carrillo & Rodríguez Fernández, 2001) (ex Stygiochthonius); P. curvidigitatus (Mahnert, 1997) (ex Lagynochthonius); P. setiger (Mahnert, 1997) (ex Tyrannochthonius); and P. superstes (Mahnert, 1986) (ex Tyrannochthonius). A key is given to the genera of the Tyrannochthoniini. The parallel evolution in several groups of pseudoscorpions of a characteristic chelal morphology, here termed lagyniform, is discussed. New designations are proposed for the spot-sensilla of the chelal fingers. The so-called ‘sensorium’ near the tip of the fixed chelal finger of Lagynochthonius species is shown to be a modified tooth that has migrated dorsally from the dental margin. The new term rallum is introduced as a replacement for the inappropriate term ‘flagellum’, as applied to the cheliceral blades of pseudoscorpions. The term bothridial vestibulum is introduced for the internal cuticular sheath at the base of the bothridia of the trichobothria.Lagynochthonius fragilis n. sp. est décrit d’une grotte calcaire de la province de Kien Giang, au sud du Vietnam, actuellement menacée par une exploitation de carrière. Elle est la première espèce troglomorphe du genre Lagynochthonius Beier, 1951 connue de l’Asie continentale. La présence des soies chemosensorielles sur la main de la pince est interprétée comme une synapomorphie de la tribu des Tyrannochthoniini Chamberlin, 1962. Le genre néo-zélandais Maorichthonius Chamberlin, 1925 est transféré des Chthoniini Daday à la tribu des Tyrannochthoniini. Le genre Tyrannochthoniella Beier, 1966, également endémique de la Nouvelle Zélande, est attribué à la tribu des Chthoniini Daday, 1888. Le genre Stygiochthonius Carabajal Márquez, García Carrillo & Rodríguez Fernández, 2001, du sud de l’Espagne, est mis en synonymie avec Paraliochthonius Beier, 1956 (n. syn. subj.). Cinq combinaisons nouvelles sont proposées : Lagynochthonius ovatus Vitali-di Castri, 1984 (ex Tyrannochthonius) ; Paraliochthonius barrancoi (Carabajal Márquez, García Carrillo & Rodríguez Fernández, 2001) (ex Stygiochthonius) ; P. curvidigitatus (Mahnert, 1997) (ex Lagynochthonius) ; P. setiger (Mahnert, 1997) (ex Tyrannochthonius) ; et P. superstes (Mahnert, 1986) (ex Tyrannochthonius). Une clé de détermination des genres de Tyrannochthoniini est fournite. L’évolution parallèle des facies caractéristiques de la pince, ici qualifié de “ lagyniforme ”, est évoquée chez plusieurs groupes de pseudoscorpions. Desnouveaux sigles sont proposés pour les sensilles punctiformes des doigts de la pince. Il est démontré que le “ sensorium ” à l’extrémité du doigt fixe de la pince des espèces de Lagynochthonius est une dent modifiée qui a migré dorsalement dès la marge dentale. Le terme inapproprié de “ flagelle ”, dans le sens de son application aux lames chélicèriennes des pseudoscorpions, est remplacé par rallum. Le terme nouveau vestibule trichobothriale est introduit pour la gaine cuticulaire à la base des bothridies des trichobothries.References
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