Invertebrate Systematics Invertebrate Systematics Society
Systematics, phylogeny and biogeography

The systematics of the south-east Asian genus Fangensis Rambla (Opiliones : Cyphophthalmi : Stylocellidae)

Peter J. Schwendinger A C and Gonzalo Giribet B
+ Author Affiliations
- Author Affiliations

A Muséum d’histoire naturelle, Département des Arthropodes et d’Entomologie I, 1, route de Malagnou, case postale 6434, CH-1211 Genève 6, Switzerland.

B Museum of Comparative Zoology, Department of Organismic & Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.

C Corresponding author. Email:

Invertebrate Systematics 19(4) 297-323
Submitted: 28 May 2005  Accepted: 22 July 2005   Published: 30 September 2005


The hitherto monotypic opilionid genus Fangensis Rambla, 1994 is re-evaluated from new material collected in northern, western and southern Thailand. The original description of F. leclerci Rambla (type material not traceable) was based on specimens belonging to at least three distinct species. Fangensis leclerci is thus redefined and the binomen restricted to specimens from a cave in northern Thailand only. Three new species are described, F. spelaeus, sp. nov. and F. cavernarus, sp. nov. from two caves in western Thailand and F. insulanus, sp. nov. from forests on two islands in southern Thailand. Taxonomic characters are discussed and relationships among Fangensis species and between Fangensis and other cyphophthalmids are evaluated using morphological data and ~4 Kb of molecular data from three loci, two nuclear ribosomal genes and a mitochondrial coding gene. Overall, data indicate monophyly of Stylocellidae and morphological and ribosomal data suggest monophyly of Fangensis, which is in turn divided into two clades, one composed of the three species from northern and western Thailand and the other represented by the species from southern Thailand. Observations on mating in F. leclerci are provided.

Additional keywords: genitalia, mating, Miopsalis, molecular phylogeny, Stylocellus, taxonomic characters, Thailand, troglobiomorphs.


Christine Lehmann-Graber (Geneva) produced the habitus drawing of F. spelaeus, sp. nov. Sarah Boyer (Harvard University) assisted with collecting sequence data for outgroups. Saowapa Sonthichai and Pakawin Dankittipakul (Chiang Mai University, Thailand) helped finding Tham Klaeb and Tham Klaeb Yai. Louis Deharveng (Muséum National d’Histoire Naturelle, France) kindly provided access to stylocellid specimens and to speleological publications. This material is based on work supported by the National Science Foundation under Grant No. 0236871 to G.G.


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