﻿Two new species of the millipede genus Glyphiulus Gervais, 1847 (Diplopoda, Spirostreptida, Cambalopsidae) from caves in northern Thailand.

Natdanai Likhitrakarn,Sergei I Golovatch,Sopark Jantarit

doi:10.3897/zookeys.1056.71395

Two new species of the millipede genus Glyphiulus Gervais, 1847 (Diplopoda, Spirostreptida, Cambalopsidae) from caves in northern Thailand.

Natdanai Likhitrakarn, Sergei I Golovatch + Show 1 more

Open Access

https://doi.org/10.3897/zookeys.1056.71395

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Abstract

Two new species of the genus Glyphiulus Gervais, 1847 are described and illustrated. The first species, G.longussp. nov., is the second species of the javanicus-group to be found in Thailand. It resembles G.guangnanensis Jiang, Guo, Chen & Xie, 2018, from southern China, but is distinguished by a smaller size and the carinotaxic formula of the collum, combined with ♂ legs 1 bearing very strongly reduced telopodites, the anterior gonopods showing a pair of very long and slender apicomesal processes, and the denser plumose and stout flagella of the posterior gonopods. The second species, G.promdamisp. nov., the fifth member of the granulatus-group in Thailand, seems to be particularly similar to G.subbedosae Likhitrakarn, Golovatch & Panha, 2017, from Laos. However, it can be distinguished from the latter species mainly by showing a uniformly yellow collum and the posterior gonopod coxite bearing several strong setae in median and lateral views, coupled with the anterior gonopod coxosternum being microsetose in the anterior and medial parts in caudal view. An identification key to, and a distribution map of, all seven Glyphiulus species currently known to occur in Thailand are also provided.

Highlights

The millipede family Cambalopsidae Cook, 1895 is very common, abundant and widespread in subterranean habitats of Thailand
We provide a distributional map of, and a key to, all seven species of the genus currently known to occur in Thailand
This new species seems to be similar to G. subbedosae Likhitrakarn, Golovatch & Panha, 2017, from Laos (Likhitrakarn et al 2017), with which it shares the following diagnostic characters: body size, colour pattern and unique carinotaxic formulae, coupled with certain anterior and posterior gonopod structural details. It differs from G. subbedosae primarily by a uniformly yellow collum (Fig. 3A–C) and the median and lateral parts of the posterior gonopod coxite with 10–12 strong setae (Fig. 4K), coupled with the anterior gonopod coxosternum being moderately microsetose in the anterior and medial parts on the caudal face (Fig. 4H)

Summary

Introduction

The millipede family Cambalopsidae Cook, 1895 is very common, abundant and widespread in subterranean habitats of Thailand. Within this family, three genera are wellrepresented in Thai caves: Glyphiulus Gervais, 1847 (4 species), Plusioglyphiulus Silvestri, 1923 (14 species) and Trachyjulus Peters, 1864 (5 species) (Golovatch et al 2009, 2011a, b, 2012b; Likhitrakarn et al 2020). Two distinct species groups are currently recognized in Glyphiulus, based on the conformation of ♂ legs 1 (Golovatch et al 2007a, b). In the javanicus-group, ♂ legs 1 are usually with nearly normal 4- or 5-segmented telopodites, coupled with medially contiguous, but not entirely fused central coxal processes, and special carinotaxy patterns on the collum and following metaterga. We provide a distributional map of, and a key to, all seven species of the genus currently known to occur in Thailand

Materials and methods

Discussion