Pseudophanias tanintharyiensis, Inoue & Nomura, 2021

Inoue, Shota & Nomura, Shûhei, 2021, Two new species of Pseudophanias Raffray from Myanmar (Coleoptera Staphylinidae: Pselaphinae), Zootaxa 4996 (3), pp. 591-599 : 595-597

Pseudophanias tanintharyiensis sp. nov.

( Figs 4–6 )

Type material. HOLOTYPE: ♂, “Pt. A along the gas pipeline / in Tanintharyi N.R. (150m) / (by Winkler extractor) / [ MYANMAR] / N14°44′17″ E98°11′40″ / 22.i.2017, S. Nomura leg. // FAUNA MYANMARICA / Staphylinidae , Pselaphinae / Pseudophanias sp. 2 / S. Nomura det., 2018 // HOLOTYPE (red) / ♂, Pseudophanias / tanintharyiensis / des. Inoue & Nomura, 2021 ”

PARATYPES (14♂♂, 19♀♀): 8♂♂, 8♀♀, same data as holotype ; 3♂♂, 6♀♀, Tanintharyi Nature Reserve (150 m), Pt. B along the gas pipeline, 14°44′17″N, 98°11′40″E, 22 I 2017, S. Nomura leg. (Winkler extractor) ; 2♂, 1♀, Tanintharyi Nature Reserve (100 m), 14°44′22″N, 98°11′42″E, 16 XI 2018, S. Nomura leg. (leaf litter) ; 1♂, 4♀♀, same data except 17 XI 2018. Each paratype pinned with the following label: “ PARATYPE (yellow) / ♂ (or ♀), Pseudophanias / tanintharyiensis / des. Inoue & Nomura, 2021 ” .

Diagnosis. The new species is readily distinguished from the other members of Pseudophanias by a combination of the following characteristics: Antennomeres 6 enlarged in male; metatibiae with slight laminate plate at mesal margin in male; tergite IV lacking discal carinae; aedeagus asymmetrical; median lobe broadened apically and curved laterally at apical part; apex longitudinally sub-truncated in dorso-ventral view.

Description. Male ( Figs 4A and 5A, B ). Body length 1.90–2.02 mm. Dorsal surface densely covered with setae.

Head (HL/HW 0.89–1.00) slightly wider than long, densely and coarsely punctate; frons moderately short, with frontal rostrum about 3/4 as wide as HW, with longitudinal, shallow sulcus at middle including a glabrous fovea; vertex with pair of fovea; eyes prominent, small; occipital margin in lateral view nearly straight, with dense tufts of setae; U-shaped setose sulci separate from eyes. Antennae ( Fig. 5C ) length 0.92–1.05 mm; antennomeres 1 about as long as 2–3 combined; antennomeres 2–5 moniliform, successively widened apically; antennal clubs formed by antennomeres 6–11, in lateral view slightly concave dorsally; antennomeres 6 enlarged, about as long as 1, slightly convex ventrally at basal part, each with glabrous area at ventral surface; antennomeres 7–11 successively broader; antennomeres 11 largest, sub-oval. Maxillary palpi symmetrical; palpomeres 1 minute; palpomeres 2 elongate, narrowed in basal halves; palpomeres 3 small, widest at apices; palpomeres 4 fusiform.

Pronotum (PL/PW 0.86–1.09) about as long as wide, widest at middle, finely punctate except for antebasal area, with a median and pair of lateral antebasal foveae; antebasal area coarsely punctate.

Elytra (EL/EW 0.59–0.69) much wider than long, trapezoidal; each elytron with two basal foveae; discal stria distinct, extending to posterior third. Mesoventrite ( Fig. 5D ) with median setose area narrow; setose area about 1/5 as wide as mesoventral width; lateral mesoventral foveae glabrous; metaventrite coarsely punctate at middle, convex, but area just above metaventral apex roundly impressed; that impression half as long as metaventral length, about 0.3 times wider than metaventral width; anterior margin of that impression demarcated from other part of metaventrite. Legs with each femora broadest near middle; protibiae straight; mesotibiae arcuate at apical fourth; metatibiae ( Fig. 5E ) nearly straight, each mesal margin with slight laminate plate; each tarsi ( Fig. 5F ) with tarsomere 2 two-thirds as long as tarsomere 3; tarsal claws each asymmetrical in size; posterior claws thin, short.

Abdomen (AL/AW 0.71–0.83) wider than long; tergite IV longest, twice as long as tergite V, lacking discal carinae; tergite VIII and sternite VIII as in Fig. 6E, F .

Aedeagus ( Fig. 6A–D ) 0.44–0.48 mm in length, sclerotized, asymmetrical; median lobe elongate, roundly concave at middle thirds in dorsal view, strongly narrowed at posterior of apical part and then broadened apically and curved laterally at apical part, in lateral view curved ventrally and strongly tapered towards apex; apex longitudinally sub-truncated in dorso-ventral view; parameres elongate, with 4 setae at apices; endophallus indistinct.

Female ( Fig. 4B ). General appearance similar to male; antennae unmodified, successively widened towards apices, length 0.76–0.89 mm; antennomeres 6 quadrate, slightly longer than 5 and 7; eyes smaller than in male; each metatibiae lacking laminate plate; metaventrite simple, lacking impression.

Measurements. Male (N = 7). BL 1.90–2.02 mm; HL 0.37–0.40 mm, HW 0.39–0.44 mm; PL 0.38–0.44 mm,

PW 0.43–0.47 mm; EL 0.50–0.56 mm, EW 0.77–0.84 mm; AL 0.55–0.65 mm, AW 0.78–0.81 mm. Female (N

= 7). BL 1.84–1.97 mm; HL 0.38–0.40 mm; HW 0.37–0.405 mm (HL/HW 0.96–1.08); PL 0.40–0.44 mm; PW

0.40–0.45 mm (PL/PW 0.95–1.07); EL 0.46–0.49 mm; EW 0.76–0.82 mm (EL/EW 0.58–0.60); AL 0.58–0.65 mm;

AW 0.75–0.82 mm (AL/AW 0.77–0.82). Distribution. Myanmar (Tanintharyi Region). Etymology. The specific epithet ‘ tanintharyiensis’ refers to the type locality, Tanintharyi, Myanmar. Remarks. The female of the new species is similar to the female of Pseudophanias excavatus , but it can be distinguished by the shape of antennomeres (antennomeres 2–10 each strongly transverse in P. excavatus ), the narrower mesoventral median setose area than in P. excavatus , and the glabrous lateral mesoventral foveae (setose in that of P. excavatus ).

Figures

FIGURE 4. Dorsal habitus of Pseudophanias tanintharyiensis sp. nov. A. Male. B. Female. Scale bar: 1.0 mm.

FIGURE 5. Morphological details of Pseudophanias tanintharyiensis sp. nov., male. A. Ventral habitus. B. Head and pronotum in lateral view. C. SEM image of antenna in ventral view. D. SEM image of metaventrite in ventral view. E. Metatibia. F. SEM image of protarsus. Scale bars: 1.0 mm in A, B; 0.5 mm in C–E; 0.1 mm in F.

FIGURE 6. Male genitalia of Pseudophanias tanintharyiensis sp. nov. A, B. Ventral view. C. Dorsal view. D. Lateral view. E. Tergite VIII. F. Sternite VIII. Scale bar: 0.2 mm.