Tmesiphorus okinawensis, Inoue & Maruyama & Nomura, 2019

Inoue, Shota, Maruyama, Munetoshi & Nomura, Shûhei, 2019, Revision of the genus Tmesiphorus LeConte, 1849 (Coleoptera: Staphylinidae: Pselaphinae) from Japan, Zootaxa 4646 (1), pp. 67-86 : 82-84

Tmesiphorus okinawensis sp. nov.

[Japanese name: Okinawa-higekata-arizukamushi]

( Figs 13–15 )

Tmesiphorus sp. 2, Maruyama et al., 2013: 34 (illustration, diagnosis).

Type material. Holotype (placed in NSMT): ♂, Japan: [Ryûkyû]: Kume-jima , Mt. Daruma–Mt. Ôtake, 15 IV 1995, N. Takahashi leg., NSMT-I-C- 200335 . Paratypes: 1♂, Japan: [Ryûkyû]: Kume-jima , Gushikawa-son, Mt. Ôtake, 4 XII 1997, S. Inada leg. ( NSMT) ; 1♀, Okinawa-jima , Ôkuni-rindô, 23 IV 1986, S. Nomura leg. ( NSMT) ; 2♀, Okinawa-jima , Kunigami-son, Yona, 15 II 2010, T. Shimada leg. ( CM) ( KUM) ; 1♀, Okinawa-jima , Nago-shi, Mt. Nago-take, 7 IX 2003, S. Arai leg. ( NSMT) .

Diagnosis. Tmesiphorus okinawensis sp. nov. is readily distinguished from the other Japanese species by the combination of stouter body, significantly longer setae on body surface, weakly shining body, and absence of tergal carinae.

Description. Male ( Fig. 13-A ). Body length 2.63 mm. Body reddish-brown; large and stout; dorsal surface polished and weakly shining.

Head ( Figs. 14-A, B ) wider than long, HL 0.43–0.45 mm, HW 0.54–0.55 mm, transverse, weakly shining, covered with long setae; frons short longitudinally, weakly punctate, with short longitudinal groove including large fovea; vertex with two foveae, with short longitudinal carina between vertexal foveae; eyes large, prominent; occiput rounded gently, with tufts of yellow setae; postocular margin slightly longer than eyes, roundly narrowed towards head base; antennae ( Figs. 13-C, D ) slightly slender, with antennomeres I thick and elongate, two times as long as II; III–V each longer than wide; VI–VIII each transverse, successively broadening towards apices; IX–XI significantly enlarged to form club, curved inward in outer margin; IX each longer than wide, 1.5 times as long as X, thickened apically, shallowly depressed longitudinally from basal 1/4 to apical margin with dese setae on ventral surface, with a depression on ventral surface broad, 3/4 as wide as segmental width; X each about as long as wide, quadrate, about as wide as base of IX, with small glabrous area on ventral surface with sparse setae; XI each about as wide as IX, slightly longer than IX, produced outward at middle, nearly lanceolate, thickened apically from base to middle, narrowed apically from middle to apex, shallowly depressed with sparse setae on ventral surface, with a depression on ventral surface broadened from base to middle, nearly circular; maxillary palpi asymmetrical, segments II and III with penicillate spine on lateral margin; IV thick, with rounded lobe on lateral margin; apical portion conical.

Pronotum ( Fig. 14-C ) about as long as wide, PL 0.55–0.58 mm, PW 0.55–0.56 mm; dorsum broadly rounded, widest posterior to middle, polished and weakly shining, densely covered with long setae, with distinct median and lateral foveae at posterior base; elytra ( Fig. 14-D ) much wider than long, EL 0.78 mm, EW 1.10–1.15 mm, trapezoidal, covered with long setae; each elytron with basal median and inner foveae pubescent, slightly sulcate from median fovea to elytral midpoint; posterior margin with brush-like of yellow setae; profemora as thick as mesofemora, metafemora most slender; tibiae all elongate, with dense yellow setae at apices; protibiae with white setae on anterior face; mesotibiae longer than protibiae; metatibiae longest; tarsi ( Fig. 14-F ) all elongate; tarsomeres II 2 /3 as long as III; protarsal claws asymmetrical; anterior claws each thicker than posterior one.

Abdomen ( Fig. 14-E ) wider than long, AL 0.83–0.88 mm, AW 1.15– 1.13 mm, enlarged, surface polished, weakly shining, with long setae, narrowed posteriorly; tergite IV as long as VI; tergite V longest; tergite IV with brush-like of yellow setae along posterior margin; tergites IV and V lacking carinae.

Male genitalia ( Fig. 15 ) 0.35 mm in length, well-sclerotized, small, oval, slightly slender; parameres symmetric, projecting ventrally; each paramere with three setae; median lobe asymmetric, right part longer than left in ventral view, projecting ventrally; projection slightly thick; basal bulb broad, narrowed apically, secondary gonopore small; endophallus sclerotized, short, enlarged at base, curved dorsally in lateral view.

Female ( Fig. 14-B ). BL 2.63–2.81mm; HL 0.43–0.46 mm; HW 0.54–0.59 mm; PL 0.54–0.59 mm; PW 0.55– 0.60 mm; EL 0.73–0.78 mm; EW 1.08–1.18 mm; AL 0.94–1.00 mm; AW 1.13–1.20 mm. Antennae slender than in male, with antennomeres XI, II–VIII each longer than wide, successively broadened towards apices; antennomeres IX–XI not modified, smaller than in male, antennal club indistinct.

Etymology. The new species is named after its type locality.

Distribution. Japan: [Ryûkyû]: Okinawa-jima, Kume-jima.

Biology. This species has been collected from nests of Camponotus monju ( Maruyama et al. 2013) .

Figures

FIGURE 13. A, B: Habitus of Tmesiphorus okinawensis sp. nov., C, D: left antenna. A, male; B, female; C, antenna in dorsal view; D, antennal club in ventral view by SEM.

FIGURE 14. Tmesiphorus okinawensis sp. nov., male. A, head; B, head in dorsal view; C, pronotum; D, elytra; E, abdomen; F, right protarsus.

FIGURE 15. Male genitalia of Tmesiphorus okinawensis sp. nov., A, ventral view; B, lateral view; C, dorsal view.