Velarifictorus (Pseudocoiblemmus) bilobus, Tan, Ming Kai, Dawwrueng, Pattarawich & Artchawakom, Taksin, 2015

Tan, Ming Kai, Dawwrueng, Pattarawich & Artchawakom, Taksin, 2015, A new species of Velarifictorus (Pseudocoiblemmus) from Thailand (Gryllidae; Gryllinae; Modicogryllini) with key to species, Zootaxa 3981 (1), pp. 138-142: 139-142

publication ID

http://dx.doi.org/10.11646/zootaxa.3981.1.8

publication LSID

lsid:zoobank.org:pub:63039614-D3A1-45ED-AE59-F6BF2E9A9B3B

persistent identifier

http://treatment.plazi.org/id/038987A3-FFCB-FFF8-FF60-FA667932FD8A

treatment provided by

Plazi

scientific name

Velarifictorus (Pseudocoiblemmus) bilobus
status

new species

Velarifictorus (Pseudocoiblemmus) bilobus  , new species

( Fig. 1View FIGURE 1)

http://lsid.speciesfile.org/urn:lsid: Orthoptera  .speciesfile.org:TaxonName: 470461

Material examined. Holotype (male): Thailand, Nakhon Ratchasima, Sakaerat Environmental Research Station, main road near Upper Dam, dry evergreen, on ground, N 14.49787, E 101.91686, 503.7+/-10.5 m, 2 July 2014, 2214 hours, coll. M. K. Tan, H. Yeo & S. T. Toh ( SERS. 14.158, preserved in alcohol) ( ZRC).

Paratypes: 5 males. Same locality as holotype: 1 male (THNHM-I- 2015 -00017), main road, dry evergreen, on ground, 400–450 m, 23 May 2014, coll. P. Dawwrueng, T. Dowwiangkan & K. Jiaranaisakul; 1 male ( SERS. 14.109, ZRC), main road near light trap area, dry evergreen, attracted to UV light, N 14.50753, E 101.92859, 434.9+/-6.5 m, 27 June 2014, 2209 hours, coll. M. K. Tan, H. Yeo & S. T. Toh; 1 male ( SERS. 14.162, ZRC, preserved in alcohol), main road near Upper Dam, dry evergreen, on tarmac road, N 14.49808, E 101.91684, 511.0+/- 6.4 m, 2 July 2014, 2249 hours, coll. M. K. Tan, H. Yeo & S. T. Toh; 2 males (THNHM-I- 2015 -00031, THNHM-I- 2015 -00032), trail to lower dam, dry evergreen, on ground, 400–450 m, 25 July 2014, coll. P. Dawwrueng & K. Yimyoo.

Diagnosis. This species differs from all known species of Velarifictorus (Pseudocoiblemmus)  by epiphallus bridge with median process setose and distinctively bilobous, lobe triangular, distinctively emarginated between lobes. This species is similar to Velarifictorus (Pseudocoiblemmus) brevifrons Gorochov, 2001  on the basis of the rostral process of head short and truncated; but differs by median process of epiphallus bridge (bilobous instead of truncated) and hind median projection of epiphallus (tapering into acute apex rather than transverse and truncated). This species is also similar to Velarifictorus (Pseudocoiblemmus) longifrons (Chopard, 1969)  on the basis of the median process of epiphallus bridge lobous and hind median projection of epiphallus with acute apex; but differs in the rostral process not being elongated and angular, median process of epiphallus bridge and hind median projection of epiphallus triangular (rather than slender).

Description. Habitus typical of the genus ( Fig. 1View FIGURE 1 A). Head large, about as long as pronotum (n = 6). Rostral process relatively short and truncated; face distinctly concave anteriorly ( Fig. 1View FIGURE 1 B); rostrum between antennal cavities about 2.6 times wider than scapus ( Fig. 1View FIGURE 1 C). Maxillary palps long, with apical segment more than 0.5 times length of fore tibiae ( Fig. 1View FIGURE 1 C). Pronotum pubescent, with margins with a row of thick and longer setae. Pronotal dorsal disc 1.4 times wider than long (n = 6); with anterior margin slightly emarginated in the middle and posterior margin feebly concaved; longitudinal suture quite distinctly throughout. Pronotal lateral lobe with ventral margin nearly straight, ventro-anterior margin angulated, posterior margin broadly rounded ( Fig. 1View FIGURE 1 B). Legs generally pubescent. Fore and middle legs with longer and thick setae; more dense on femora. Fore tibiae with only outer tympanum; outer tympanum open, long and slender. Hind tibiae with 5 and 5 inner and outer subapical spurs; 3 and 3 inner and outer apical spurs. Hind tarsus with 6–8 and 6–8 inner and outer spines.

Male. Tegmen reaching apical end of sixth abdominal tergite, hind wings not surpassing tegmina ( Fig. 1View FIGURE 1 A). Tegminal venation as in Fig. 1View FIGURE 1 D: dorsal field with 2 substraight oblique or harp veins; rounded cord veins (Cu 1 and 1 A); mirror large, about as wide as long, faint dividing line at the distal third; apical area rather truncated. Lateral field with 6– 8 longitudinal veins. Tenth abdominal tergite transverse, apical margin angularly convex in the middle. Epiproct with basal half transverse, bulbous laterally with short and fine setae and forming a triangular shallow depression in the middle; with apical half less wide than basal half, truncated and tongue-shaped; apical margin broadly with setae ( Fig. 1View FIGURE 1 E). Cercus long and covered with very dense short hairs and dense long hairs. Subgenital plate elongated, with apex tapering and subacute. Genitalia as shown in Figs. 1View FIGURE 1 F – 1 H. Epiphallus bridge with median process setose and distinctively bilobous, lobe triangular, distinctively emarginated between lobes ( Fig. 1View FIGURE 1 F). Median lobe of epiphallus slender, surpassing median process of epiphallus bridge but not surpassing median parameres; at the apex with bush of long hairs that surpass the median paramere ( Figs. 1View FIGURE 1 F, 1 G). Hind median projection of epiphallus tapers into acute apex ( Fig. 1View FIGURE 1 H). Median paramere of epiphallus split into two basal branches: baso-internal branch slender and tapering apically; baso-external branch much broader, with external margin bulbous and basal margin truncated ( Fig. 1View FIGURE 1 G). The apical half of median paramere of epiphallus broad, tapering at the rounded apex; apex with an external projection with an obtuse apex ( Fig. 1View FIGURE 1 G).

Female. Unknown.

Colouration. Head and pronotum generally dark red brown to black. Scapus and antennae unicolourous brown. Face dark brown with pale spots around ocelli. Labium and clypeus dark brown, mandible yellow brown. Maxillary palpi dark brown (apical segments) to yellow brown (basal segments). Tegmen with dorsal field brown and lateral field dark brown at the dorsal half and pale at the ventral half. Legs yellow brown. Abdominal tergite dark red brown, with epiproct brown. Abdominal sternite, including subgenital plate pale to yellow brown.

Measurements. See Tables 1 and 2.

Etymology. The species name refers to the male epiphallus bridge with median process which is distinctively bilobous and clearly emarginated between the lobes; derived from Latin (= bilobous, masculine).

Life history. This ground-dwelling species inhabits dry evergreen forests and may be attracted to UV light.

TABLE 1. Measurements of Velarifictorus (Pseudocoiblemmus) bilobus sp. n. (in mm, mean values in brackets).

  HL   PW   HFL HTL
Holotype SERS.14.158 20.0       9.7    
SERS.14.162 19.1       9.2    
SERS.14.109 23.4       9.4    
THNHM-I-2015-00017 24.0       9.3    
THNHM-I-2015-00031 20.7       9.7    
THNHM-I-2015-00032 20.7       9.6    

TABLE 2. Counts of Velarifictorus (Pseudocoiblemmus) bilobus sp. n. (mean values in brackets).

  n(HTISS) n(HTOSS) n(HTIAS) n(HTOAS) n(HTIS) n(HTOS)
THNHM-I-2015-00032            
ZRC

Zoological Reference Collection, National University of Singapore