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| Glyphiulus pseudocostulifer from Oudomxay Province, G. houaphanhensis from Houaphan Province Likhitrakarn, Jeratthitikul, Jirapatrasilp & Wesener, 2024 Raffles Bulletin of Zoology. 72 |
Abstract
Three new species of the millipede genus Glyphiulus Gervais, 1847 are described and illustrated based on specimens collected from caves in Laos, namely G. pseudocostulifer, new species, from Oudomxay Province, G. steineri, new species, from Khammouan Province, and G. houaphanhensis, new species, from Houaphan Province. All of them belong to the javanicus-group, which share the unique structure of the first pair of legs in males and the carinotaxic formula of midbody rings. However, they differ from each other in the number of ommatidia, body colouration, the carinotaxic formula of the collum, as well as anterior and posterior gonopod structures. Mitochondrial COI sequences were used as DNA barcodes for species delineation, and were successfully obtained for two of the new species (G. pseudocostulifer, new species, and G. steineri, new species). Phylogenetic analyses revealed strong support for all examined Glyphiulus species, even for a pair of species which exhibited high morphological similarity, with mean uncorrected COI p-distances between Glyphiulus species ranging from 15–22%. Two additional Glyphiulus species are listed, but not described, as male material is lacking. One of them occurs in direct sympatry with G. houaphanhensis, new species. An identification key to the species of Glyphiulus so far recorded from Laos and a distribution map are also presented.
Key words. millipedes, key to species, cave fauna, molecular systematics, COI
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| Glyphiulus pseudocostulifer, new species, male holotype (ZFMK MYR10009A). Glyphiulus steineri, new species, male holotype (ZFMK MYR6203). Glyphiulus houaphanhensis, new species, male holotype (ZFMK MYR10011C). |
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| Glyphiulus pseudocostulifer, new species, male holotype (ZFMK MYR10009A). A–C, anterior part of body, lateral, dorsal, and ventral views, respectively; D, E, midbody rings, dorsal and lateral views, respectively; F, cross-section of a midbody ring; G–I, posterior part of body, lateral, dorsal, and ventral views, respectively |
Glyphiulus pseudocostulifer, new species
Etymology. To emphasise the obvious similarities to G. costulifer Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007. Noun in apposition.
Glyphiulus steineri, new species
Etymology. To honour the German collector and biospeleologist Helmut Steiner, an active explorer of the caves of Laos, noun.
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| Glyphiulus houaphanhensis, new species, male holotype (ZFMK MYR10011C). A–C, anterior part of body, lateral, dorsal, and ventral views, respectively; D, E, midbody rings, dorsal and lateral views, respectively; F, cross-section of a midbody ring; G–I, posterior part of body, lateral, dorsal, and ventral views, respectively |
Glyphiulus houaphanhensis, new species
Etymology. The species is named in allusion to the type locality — Houaphan Province, adjective.
Natdanai Likhitrakarn, Ekgachai Jeratthitikul, Parin Jirapatrasilp and Thomas Wesener. 2024. Integrated Taxonomy of Three New Species of Glyphiulus Gervais, 1847 (Diplopoda, Spirostreptida, Cambalopsidae) from Laos. Raffles Bulletin of Zoology. 72; 42–61.
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