Two new species of the millipede genus Glyphiulus Gervais, 1847 from Laos (Diplopoda, Spirostreptida, Cambalopsidae)

Abstract

Two new species of Glyphiulus are described and illustrated from northern Laos. The epigean Glyphiulus subbedosae Likhitrakarn, Golovatch & Panha, sp. n. is the second member of the granulatus-group to be found in that country and it seems to be especially similar to G. bedosae Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007. However, it differs from the latter species by a row of several strong setae near the median marginal ridge on the paraprocts, combined with the gnathochilarium being considerably less densely setose on the caudal face, and the anterior gonopods showing a pair of smaller, apical, but larger lateral teeth on the coxosternal plate. Glyphiulus semicostulifer Likhitrakarn, Golovatch & Panha, sp. n. is the fourth member of the javanicus-group to be discovered in Laos, taken from a cave. It seems to be particularly similar to G. costulifer Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007, but is distinguished by the more sparsely alveolate background fine structure of the metazonae, coupled with the gnathochilarium being considerably less densely setose on the caudal face, much stronger paramedian prongs and 4-segmented telopodites on ♂ coxae 1, the slightly longer and more slender apicoparamedian sternal projections on the anterior gonopods, and the much longer flagella of the posterior gonopods. An identification key to and a distribution map of Glyphiulus species in Laos are also presented.

A remarkable new species of the millipede genus Trachyjulus Peters, 1864 (Diplopoda, Spirostreptida, Cambalopsidae) from Thailand, based both on morphological and molecular evidence

“…The genus Trachyjulus shows a collum which is smooth or nearly smooth at least dorsally, usually not particularly inflated compared to postcollum constrictions; midbody metazonae are strongly carinate, the carinotaxic formulae typically being 11-8/11-8+I/ i+2/2+m/m; male leg 1 is strongly reduced to a broad transverse coxosternum that shows a pair of central, often completely fused coxal processes flanked by rudimentary telopodites; some structures of the gonopods are also unique. It is gonopodal structures, often highly conservative, that usually appear to be especially useful for species delimitations among congeners in the family Cambalopsidae (Golovatch et al 2007a(Golovatch et al , 2007b(Golovatch et al , 2009(Golovatch et al , 2011a(Golovatch et al , 2011b(Golovatch et al , 2011c(Golovatch et al , 2011d(Golovatch et al , 2012bJiang et al 2017;Likhitrakarn et al 2017). Morphologically, the new species looks especially similar to T. unciger, but both are clearly distinguishable (see Diagnosis above).…”

“…By far the largest genus is Glyphiulus Gervais, 1847 with its 60+ species ranging across China and Southeast Asia to Borneo in the east (Golovatch et al 2007a(Golovatch et al , 2007b(Golovatch et al , 2011b(Golovatch et al , 2011c(Golovatch et al , 2012bJiang et al 2017Jiang et al , 2018Likhitrakarn et al 2017;Liu and Wynne 2019;Golovatch and Liu 2020). The genus Plusioglyphiulus Silvestri, 1923 encompasses 28 described species ranging from northern Thailand and Laos in the west, through Myanmar and Malaysia, to Borneo in the east and southeast (Golovatch et al 2009(Golovatch et al , 2011aLikhitrakarn et al 2018).…”

Four new species of the Glyphiulus javanicus group from southern China (Diplopoda, Spirostreptida, Cambalopsidae)

“…Usually, one cave supports one species of Cambalopsidae (Likhitrakarn et al 2017). However, in our investigations, it was found that two species ( G. guangnanensis sp.…”

“…They are endemic to southeast Asia, distributed from southern China, across Vietnam, Laos, and Thailand, to Java, Indonesia (Golovatch et al 2007b, Jiang et al 2017, Likhitrakarn et al 2017). Among them, fourteen species occur in China, with most of them being cavernicolous:…”

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

“…Glyphiulus is the most speciose and characteristic genus of the family Cambalopsidae (Golovatch et al 2007a). Most Glyphiulus species are considered endemic to Southeast Asia and southern China, narrow endemism prevailing because, like most Diplopoda, their dispersal capacities are very limited (Golovatch et al 2007b;Jiang et al 2017Jiang et al , 2018Likhitrakarn et al 2017). Only two species, G. granulatus (Gervais, 1847), pantropical through numerous anthropochoric introductions (Golovatch et al 2007a), and G. javanicus Carl, 1911, described from a sugar cane plantation in Java, Indonesia (Carl 1911), but from a still unclear area of origin lying somewhere in Indochina or China, are assumed to be truly widespread (Golovatch et al 2007b(Golovatch et al , 2012a.…”