Glyphiulus species

Likhitrakarn, Natdanai, Jeratthitikul, Ekgachai, Jirapatrasilp, Parin & Wesener, Thomas, 2024, Integrated taxonomy of three new species of Glyphiulus Gervais, 1847 (Diplopoda, Spirostreptida, Cambalopsidae) from Laos, Raffles Bulletin of Zoology 72, pp. 42-61 : 57-59

Key to Glyphiulus species presently known to occur in Laos ( Fig. 7 ), chiefly based on male characters, modified after Likhitrakarn et al. (2017)

1. Male leg 1 very strongly reduced, completely lacking any median structures.....................................................................2

– Male leg 1 either normal or reduced in size, but with a pair of paramedian coxal processes ( Figs. 2B, C , 4C, D , 6C, D ).....3

2. Paraprocts with a row of several strong setae near median marginal ridge; posterior gonopods broadly subquadrate, each half with a plumose apical flagellum (f) .......... G. subbedosae

– Paraprocts with a bare marginal ridge devoid of setae; posterior gonopods narrowly subrectangular ........................ G. bedosae

3. Carinotaxy formula of midbody rings 2+I/i+3/3+I/i+2..........4

– Carinotaxy formula of midbody rings 2/2+I/i+3/3+I/i+2/2 ( Figs. 1D, E , 3D, E , 5D, E ) ..............................................................5

4. Carinotaxy formula of collum, I–VI+7a+pc+ma+pc+7a+VI–I, texture of both lateral-most crests micropunctate; male leg 1 with two low, paramedian, contiguous cones; each posterior gonopod with a long and bare flagellum............. G. costulifer

– Carinotaxy formula of collum, I+2c+III–VI+5c+6a+pc+ma+pc+ 6a+5c+VI–III+2c+I, both lateral-most crests smooth; male leg 1 with medially contiguous, apically diverging cones; each posterior gonopod with a long, distally plumose flagellum .... ....................................................................... G. semicostulifer

5. Ommatidia invisible or absent ................................................6

– Ommatidia present ..................................................................7

6. Colouration entirely pallid; adult body length 14–17 mm; carinotaxy formula of collum 1–4+5a+pc+ma; apicomesal processes (d) on the anterior gonopods broad and stout, apicolateral process (ap) being small and rounded; a distally plumose flagellum process (f) present on the posterior gonopods.......................................................... G. percostulifer

– Colouration usually brownish; adult body length 18.5–22.5 mm; carinotaxy formula of collum 1+2c+3–4+5c+6a+pc+ma ( Fig. 5A–C ); apicomesal processes (d) on the anterior gonopods long and slender ( Fig. 6J, K ), apicolateral process (ap) large, curved, and subdigitiform ( Fig. 6H, I ); a slim and smooth flagellum process (f) present on the posterior gonopods ( Fig. 6J, K ) .... .............................................. G. houaphanhensis , new species

7. Carinotaxic formula of collum:1–2+3c+4a+5c+6+7c+8a+pc+ma; male leg 1 telopodites strongly reduced in size, 4-segmented; anterior gonopod with a subsecuriform coxosternum.............. ......................................................................... G. subcostulifer

– Carinotaxic formula of collum: 1–5+6a+pc+ma ( Figs. 1A, B ; 3A, B ); male leg 1 telopodites nearly normal, 5-segmented ( Figs. 2B, C , 4C, D ); anterior gonopod coxosternum with particularly high median outgrowths ( Figs. 2H, I , 4H, I )......8

8. Carinotaxic formula of midbody rings: 2+I/i+3/3+I/i+2 ( Fig. 1A, B, D, E, G, H ); apicomesal processes (d) on the anterior gonopods longer and slender ( Fig. 2H, I ); without apicolateral process (ap) ( Fig. 2H, I ); tip of flagellum process (f) on the posterior gonopods pointed ( Fig. 2J, K )................................... ............................................. G. pseudocostulifer , new species

– Carinotaxic formula of midbody rings: 2/2+I/i+3/3/3+I/i+2/2 ( Fig. 3A, B, D, E, G, H ); apicomesal processes (d) on the anterior gonopods broader and stout ( Fig. 4H, I ); with an evident, swollen, rounded apicolateral process (ap) ( Fig. 4H, I ); tip of flagellum process (f) on the posterior gonopods axe-shaped ( Fig. 4J, K ) ........................... G. steineri , new species

Figures

Fig. 7. Distribution of Glyphiulus species in Laos (9 species).: Glyphiulus semicostulifer Likhitrakarn, Golovatch & Panha, 2017; ▼: Glyphiulus pseudocostulifer, new species;: Glyphiulus costulifer Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007; ■: Glyphiulus bedosae Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007;: Glyphiulus houaphanhensis, new species;: Glyphiulus subbedosae Likhitrakarn, Golovatch & Panha, 2017;: Glyphiulus subcostulifer Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007; ◆: Glyphiulus percostulifer Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007; ●: Glyphiulus steineri, new species.

Fig. 2. Glyphiulus pseudocostulifer, new species, male holotype (ZFMK MYR10009A). A, gnathochilarium, ventral view; B, C, leg pair 1, oral and caudal views, respectively; D, leg pair 2, caudal view; E, leg pair 3, caudal view; F, midbody leg; G, antenna, lateral view; H, I, anterior gonopods, oral and caudal views, respectively; J, K, posterior gonopods, oral and caudal views, respectively. Abbreviations: ap, apicolateral process; dp, apicomesal processes; f, flagellum process; l, lamelliform lobe. Scale bar: A–G 0.1 mm, H–K 0.02 mm.

Fig. 4. Glyphiulus steineri, new species, male holotype (ZFMK MYR6203). A, gnathochilarium, ventral view; Bm antenna, lateral view; C, D, leg pair 1, oral and caudal views, respectively; E, leg pair 2, caudal view; F, leg pair 3, caudal view; G, midbody leg; H, I, anterior gonopods, oral and caudal views, respectively; J, K, posterior gonopods, caudal and oral views, respectively. Abbreviations: ap, apicolateral process; dp, apicomesal processes; f, flagellum process; l, lamelliform lobe. Scale bar: A–G 0.1 mm, H–K 0.02 mm.

Fig. 6. Glyphiulus houaphanhensis, new species, male holotype (ZFMK MYR10011C). A, gnathochilarium, ventral view; B, antenna, lateral view; C, D, leg pair 1, caudal and oral views, respectively; E, leg pair 2, caudal view; F, leg pair 3, caudal view; G, midbody leg; H, I, anterior gonopods, caudal and oral views, respectively; J, K, posterior gonopods, oral and caudal views, respectively. Abbreviations: ap, apicolateral process; dp, apicomesal processes; f, flagellum process; l, lamelliform lobe. Scale bar: 0.1 mm.

Fig. 1. 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.

Fig. 3. Glyphiulus steineri, new species, male holotype (ZFMK MYR6203). 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.

Fig. 5. 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.