Nomuraius Hlaváč, 2003

Yin, Zi-Wei & Li, Lizhen, 2013, Taxonomic notes on the genus Nomuraius Hlaváč (Staphylinidae: Pselaphinae), Revue suisse de Zoologie 120 (4), pp. 563-573 : 564-565

Nomuraius Hlaváč, 2003

Nomuraius Hlaváč, 2003: 290 ;

type species: Nomuraius vietnamicus Hlaváč, 2002 by monotypy.

DIAGNOSIS: Head with distinct frontal rostrum; with small, nude vertexal foveae; lacking frontal fovea; lacking ocular-mandibular carinae; maxillary palpi asymmetric, palpomeres I short, II distinctly pedunculate at bases, roundly expanded to shortly projecting laterally, palpomeres III-IV shortly pedunculate at bases, distinctly projecting laterally. Pronotum with nude median- and lateral antebasal foveae weakly to distinctly marked, lacking antebasal sulcus. Abdomen with tergite IV longest.

REDESCRIPTION: Length 2.70-3.11 mm. Head with short, narrow frontal rostrum, rostrum slightly prominent, antennal tubercles weak; nude vertexal foveae small and nude, lacking frontal fovea, lateral postantennal pits small; with 11 antennomeres, clubs formed by apical three antennomeres; maxillary palpi asymmetric, palpomere II widest near apices, roundly expanded to slightly projecting laterally, III-IV widest near middle, distinctly projecting laterally. Gular flat, shallow foveae separated.

Pronotum with small punctiform to large round median- and lateral antebasal foveae, median longitudinal sulcus present, lacking antebasal sulcus; lateral procoxal foveae deep. Each elytron with two basal foveae; with one subbasal fovea; discal striae extending from outer basal foveae posteriorly beyond elytral midpoint. Thorax with two median mesoventral foveae widely separated; large lateral mesoventral foveae forked, anterior branch larger than posterior branch; lateral mesocoxal foveae present; lacking median and lateral metaventral foveae; posterior margin of metaventrite deeply notched medially.

Legs with tasomeres I short, II greatly lobed, extending beyond midpoint of tasomeres III.

Abdomen with tergite IV longest, more than twice length of next tergite, VI shortest, V and VII subequal in length; tergite IV with mediobasal foveae moved laterally to form large round pockets at end of basal sulcus, with two small basolateral foveae; tergites V-VII each with one pair of small basolateral foveae. Sternite IV longest, as long as V-VII combined along midlength, lacking mediobasal foveae, with large pockets formed by basolateral foveae; V-VII with basolateral foveae weakly indicated.

Males with posterior half of head, apical portions of pronotum, protibiae and metatibiae variously modified. Aedeagus with asymmetric median lobe; elongate parameres symmetric; diaphragm opening nearly oval.

DISTRIBUTION: Three species are known from South China ( N. sinicus ), and north Vietnam ( N. piaoacus , N. vietnamicus ).

COMPARATIVE NOTES: Among the members of the Pselaphodes complex of genera, Nomuraius shares only with Taiwanophodes Hlaváč the greatly lobed tarsomeres II. The two genera can be readily separated by the vertexal foveae being nude, the absence of a frontal fovea, and the pronotum lacking an antebasal sulcus connecting the nude median- and lateral antebasal foveae in Nomuraius , while Taiwanophodes has setose vertexal and frontal foveae, and the pronotal median- and lateral antebasal foveae are setose and are connected by an antebasal sulcus.

Key to males of Nomuraius

1a Head with broad, deep cavity at posterior half ( Fig. 1A ); antennomeres X much shorter than XI ( Fig. 2A ); pronotum strongly modified at anterior portion ( Fig. 2B ); metatibiae simple, not expanded medially ( Fig. 2H ). (north Vietnam: Cao Bang)....................................................... Nomuraius piaoacus Yin & Li , new spec.

1b Head concaved only at posterior margin ( Figs 1B , 4A ); antennomeres X slightly shorter than XI ( Figs 3A , 5A ); pronotum only slightly modified at anterior portion ( Figs 3B , 5B ); metatibiae expanded medially near apices ( Figs 3H , 5H )........................................... 2

2a Pronotum and elytra relatively more elongate ( Fig. 1B ); metatibiae less expanded medially near apices ( Fig. 3H ); tergite VIII about as long as wide ( Fig. 3I ); apical portion of aedeagal median lobe bent leftward dorsoventrally ( Fig. 3L, N ). (South China: Guangxi).............................................. Nomuraius sinicus Yin & Li , new spec.

2b Pronotum and elytra relatively shorter ( Fig. 4A ); metatibiae more expanded medially near apices ( Fig. 5H ); tergite VIII much wider than long ( Fig. 5I ); apical portion of aedeagal median lobe bent rightward dorsoventrally ( Fig. 5L, N ). (north Vietnam: Vinh Phu).................................................. Nomuraius vietnamicus Hlaváč

Figures

FIG. 1 Male habitus of Nomuraius Hlaváč. (A) N. piaoacus sp. n. (B) N. sinicus sp. n. Scales: 1 mm.

FIG. 2 Male diagnostic features of Nomuraius piaoacus sp. n. (A) Antenna. (B) Pronotum. (C) Metaventral process, in lateral view. (D) Protrochanter and profemur. (E) Apical portion of protibia. (F) Mesotrochanter and mesofemur. (G) metatrochanter and metafemur. (H) Apical portion of metatibia. (I) Tergite VIII. (J) Sternite VIII. (K) Sternite IX. (L) Aedeagus, in dorsal view. (M) Same, in lateral view. (N) Same, in ventral view. Scales [mm]: A, B, D, F, G = 0.3; C, I, J, L, M, N = 0.2; H, K = 0.1, E = 0.05.

FIG. 4 Nomuraius vietnamicus Hlaváč, 2003. (A) Male habitus (non-type). (B) Holotype habitus. (C) Type label. Scale: 1 mm.

FIG. 3 Male diagnostic features of Nomuraius sinicus sp. n. (A) Antenna. (B) Pronotum. (C) Metaventral process, in lateral view. (D) Protrochanter and profemur. (E) Apical portion of protibia. (F) Mesotrochanter and mesofemur. (G) metatrochanter and metafemur. (H) Apical portion of metatibia. (I) Tergite VIII. (J) Sternite VIII. (K) Sternite IX. (L) Aedeagus, in dorsal view. (M) Same, in lateral view. (N) Same, in ventral view. Scales [mm]: A, B, D, F, G = 0.3; C, I, J, L, M, N = 0.2; H, K = 0.1, E = 0.05.

FIG. 5 Male diagnostic features of Nomuraius vietnamicus Hlaváč, 2003. (A) Antenna. (B) Pronotum. (C) Metaventral process, in lateral view. (D) Protrochanter and profemur. (E) Apical portion of protibia. (F) Mesotrochanter and mesofemur. (G) metatrochanter and metafemur. (H) Apical portion of metatibia. (I) Tergite VIII. (J) Sternite VIII. (K) Sternite IX. (L) Aedeagus, in dorsal view. (M) Same, in lateral view. (N) Same, in ventral view. Scales [mm]: A, B, D, F, G = 0.3; C, I, J, L, M, N = 0.2; H, K = 0.1, E = 0.05.