Glyphiulus latus, Chen, 2017

Chen, Hui-Ming, 2017, Two new species of the millipede genus Glyphiulus Gervais, 1847 from Southwest China (Diplopoda: Spirostreptida: Cambalopsidae), Zootaxa 4323 (2), pp. 197-208 : 198-200

publication ID	https://doi.org/ 10.11646/zootaxa.4323.2.3
publication LSID	lsid:zoobank.org:pub:Ddd775C4-1A34-4034-A65A-3D9C6E038Fbd
DOI	https://doi.org/10.5281/zenodo.6034184
persistent identifier	https://treatment.plazi.org/id/03C887A1-FE14-FFF0-FF31-E928FD3FFE43
treatment provided by	Plazi
scientific name	Glyphiulus latus
status	sp. nov.

Treatment

Glyphiulus latus sp. nov.

Figs 1A‒F View FIGURE 1 , 2A‒D View FIGURE 2 , 3A‒F View FIGURE 3 , 4A‒B View FIGURE 4 , 5A‒E View FIGURE 5 , 6 View FIGURE 6

Type material. Holotype male, China: Sichuan Province, Leshan City, Muchuan County, Longgong Cave (29°11'49.21"N, 103°41'35.24"E), 4 November 2015, H.M. Chen leg. ( IBGAS) GoogleMaps . Paratypes: 2males and 6 females, same data as holotype ( IBGAS) GoogleMaps .

Etymology. This specific name is derived from the Latin word latus , meaning ‘broad’ and refers to the broad mesal process of the coxosternum of the anterior gonopods.

Diagnosis. The new species differ from other species in this genus except Glyphiulus submediator Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2011 ( Golovatch et al. 2011b: 164, figs 11‒14) from Vietnam, by the presence a prolonged and broad coxosternal mesal processes of the anterior gonopods. It can be differentiated from Glyphiulus submediator by the elongated flagellum of the posterior gonopods, male legs 1 with 5-segmented telopodites, metatergal carinotaxic formula: 2/2+I/i+3/3+I/i+2/2, and clypeus with four teeth anteromesally ( Fig. 5C View FIGURE 5 ).

Description. Holotype with 66p + 1a + T, 47 mm long and 2.3 mm wide; paratypes (male, female) with 60‒67p + 1‒4a + T, length 41‒51 mm, width 2.2‒2.5 mm.

Coloration yellow-brown to red-brown, tergal crests dark red-brown to castaneous brown ( Figs 1A‒F View FIGURE 1 , 6 View FIGURE 6 ). Clypeus with four teeth anteromedially ( Fig. 5C View FIGURE 5 ). Eyes barely discernible as slightly convex tubercles, unpigmented, 5‒10 on each side of head ( Figs 1A View FIGURE 1 , 2A‒D View FIGURE 2 ). Antennae slender, terminal part of antennomere 5 expanded, antennomeres 5 and 6 each with a distodorsal group of bacilliform sensilla ( Figs 1A View FIGURE 1 , 2A‒D View FIGURE 2 , 5D View FIGURE 5 ). Gnathochilarium with a separate promentum, polytrichous ( Fig. 3A View FIGURE 3 ).

Collum strongly crested, lateralmost crest continuous or split, carinotaxic formula (1a+2c+III‒IV+5c+6a+pc+ma+pc+6a+5c+IV‒III+2c+1a) or (I‒III+4c+5a+pc+ma+pc+5a+4c+III‒I) ( Figs 2A‒D View FIGURE 2 ). Subsequent metaterga noticeably crested as well. Postcollum constriction modest ( Fig. 1B View FIGURE 1 ). Ozopores starting from body ring 5 ( Figs 1A, B View FIGURE 1 ). Ozoporiferous tubercles round, wider than high; midbody metatergal crests complete. Crests divided into two transverse rows of tubercles, the anterior tubercle round and upright, the posterior one triangular, directed caudally. Lateral crests rather small. Carinotaxic formula 2/2+I/i+3/3+I/i+2/2 ( Figs 1A‒E View FIGURE 1 ). Body rings round in cross-section ( Fig. 3E View FIGURE 3 ).

Epiproct simple, devoid of tuberculation, with a rounded ridge in caudal part and an evident axial rib dorsally. Paraprocts convex, with only a shallow but evident depression beside caudal edge, polytrichous. Hypoproct crescent shaped, weakly setose ( Figs 1E, F View FIGURE 1 ).

Male legs 1 5-segmented, with considerably shortened telopodites and a pair of large, subdigitiform, medially contiguous, forward directed coxal processes with groups of long, robust setae at base ( Fig. 3B View FIGURE 3 ). Male legs 2 nearly normal. Penes broad, rounded, each with 4 robust setae distolaterally ( Figs 3C View FIGURE 3 , 5E View FIGURE 5 ). Male legs 3 modified, having coxa especially slender and elongate ( Fig. 3D View FIGURE 3 ). Midbody legs obviously longer than body diameter ( Fig. 3E View FIGURE 3 ). Accessory claw absent ( Fig. 3F View FIGURE 3 ).

Anterior gonopods with a pair of shield-like coxosterna, sunken medially from caudal view. Prolonged and broad coxosternal mesal processes of anterior gonopods present. Telopodites curved, moveable, lateral, 1- segmented and each with 5 strong setae distally ( Figs 4A View FIGURE 4 , 5A View FIGURE 5 ). Posterior gonopods compact, coxite with medial, apically lamelliform lobe and slender, elongated, curved flagellum; the mediolateral margin of coxite with two rows of strong and curved setae ( Figs 4B View FIGURE 4 , 5B View FIGURE 5 ).

Distribution. Known only from type locality, Sichuan, China.

Notes. Based on its evident troglomorphic traits, like eye reduction, elongation of legs and antennae and general pallid coloration, this species seems to be a troglobiont.

The carinotaxic formula of the collum and metazona in Glyphiulus are considered stable within species, and highly useful in classification ( Golovatch et al., 2007b). However, this species shows noticeable intraspecific variation of the carinotaxic formula of the collum. This variation is reflected in the lateralmost crest which may twisted or divided from the middle ( Figs 2B‒D View FIGURE 2 ). When divided, the lateralmost crest gives rise to two differently shaped, shorter crests, one derived from the anterior part, one from the posterior part of the ‘original’ crest. The number of crests thus increases by one ( Fig. 2D View FIGURE 2 ).