Abelocephala yaeyamensis, Ishikawa, Tadashi, Cai, Wanzhi & Tomokuni, Masaaki, 2015

Ishikawa, Tadashi, Cai, Wanzhi & Tomokuni, Masaaki, 2015, The assassin bug subfamily Tribelocephalinae (Hemiptera: Heteroptera: Reduviidae) from Japan, with descriptions of eight new species in the genera Opistoplatys and Abelocephala, Zootaxa 3936 (2), pp. 151-180 : 167-170

publication ID	https://doi.org/ 10.11646/zootaxa.3936.2.1
publication LSID	lsid:zoobank.org:pub:157EDA4A-00A3-469F-8234-7E7175BF13E7
DOI	https://doi.org/10.5281/zenodo.6112392
persistent identifier	https://treatment.plazi.org/id/038E87FC-FFCE-1377-FF43-BF40FE45A468
treatment provided by	Plazi
scientific name	Abelocephala yaeyamensis
status	sp. nov.

Treatment

Abelocephala yaeyamensis View in CoL sp. nov.

( Figs. 47, 48 View FIGURES 41 – 51 , 59, 60 View FIGURES 59 – 64 , 68 View FIGURES 65 – 69 , 73 View FIGURES 70 – 75 , 79 View FIGURES 76 – 80 , 99–104 View FIGURES 93 – 104 , 117 View FIGURES 114 – 119 , 123 View FIGURES 120 – 125 , 129, 135, 141, 147, 152)

Diagnosis. This species is recognized by the following combination of character states: body length approximately 4 mm in male and 5 mm in female; mandibular plate acutely angled at anterior corner and strongly projected anteriorly in dorsal view; rostral segment I approximately twice as long as segment II; posterior pronotal lobe pale brownish yellow; outer (larger) cell of hemelytral membrane acutely angled apically; and posterior process of pygophore narrow with rounded apical margin in dorsal view.

Description. Male (macropterous). Body ( Fig. 47 View FIGURES 41 – 51 ) mostly brownish. Antennae, rostrum, and legs brownish yellow. Antennal flagella pale yellow. Posterior pronotal lobe pale brownish yellow except for median longitudinal sulcus and posterior marginal area brown. Hemelytra dark brown, with corial veins yellowish brown. Abdomen yellowish brown to brown.

Head ( Figs. 47 View FIGURES 41 – 51 , 59, 60 View FIGURES 59 – 64 , 73 View FIGURES 70 – 75 ) approximately 1.4 times longer than width across eyes, 0.9 times as long as pronotum, roundly protuberant immediately behind eyes in dorsal view; anteoculus 1.2 times longer than postoculus; mandibular plate ( Fig. 60 View FIGURES 59 – 64 ) acutely angled at anterior corner and strongly projected anteriorly in dorsal view. Eye ( Figs. 59 View FIGURES 59 – 64 , 73 View FIGURES 70 – 75 ) approximately half as wide as interocular space in dorsal view. Antennal segment I slender, approximately 9 times longer than its maximum width, as long as segment II ( Figs. 99, 100 View FIGURES 93 – 104 ); flagellum 0.85 times as long as segment I ( Fig. 101 View FIGURES 93 – 104 ). Rostral segment I slender, approximately twice as long as segment II ( Fig. 73 View FIGURES 70 – 75 ).

Pronotum ( Fig. 47 View FIGURES 41 – 51 ) approximately 0.8 times as long as humeral width; anterior lobe 0.55 times as long as posterior lobe along midline, 0.75 times as wide as humeral width. Hemelytron ( Figs. 47 View FIGURES 41 – 51 , 117 View FIGURES 114 – 119 ) wide, 2.2 times longer than its maximum width, exceeding apex of abdomen by approximately 0.3 times of its length; outer (larger) cell of membrane ( Fig. 117 View FIGURES 114 – 119 ) acutely angled apically.

Pygophore ( Fig. 123 View FIGURES 120 – 125 ) elliptical in lateral view; posterior process (Fig. 129) narrow, with rounded apical margin in dorsal view. Parameres ( Fig. 135 View FIGURES 132 – 137 ) strongly curved in apical two-thirds, with rounded, inwardly projected apex in dorsal view. Struts of phallus ( Fig. 141 View FIGURES 138 – 143 ) tapering apicad, weakly constricted at apical one-third, rounded at apex, and with lateral walls thickened in basal half in dorsal view.

Female (micropterous). At first glance, quite different from male due to micropterous condition ( Fig. 48 View FIGURES 41 – 51 ).

Head ( Figs. 48 View FIGURES 41 – 51 , 68 View FIGURES 65 – 69 , 79 View FIGURES 76 – 80 ) approximately 1.5 times longer than width across eyes, 1.2 times longer than pronotum. Eye ( Figs. 68 View FIGURES 65 – 69 , 79 View FIGURES 76 – 80 ) small, approximately 0.25 times as wide as interocular space in dorsal view. Antennal segment I much stouter than that of male, approximately 5 times longer than its maximum width, as long as segment II ( Figs. 102, 103 View FIGURES 93 – 104 ); flagellum 1.1 times longer than segment I ( Fig. 104 View FIGURES 93 – 104 ). Pronotum ( Fig. 48 View FIGURES 41 – 51 ) approximately 0.9 times as long as humeral width; anterior lobe 1.3 times longer than posterior lobe along midline, 1.05 times wider than humeral width. Hemelytra ( Fig. 48 View FIGURES 41 – 51 ) small, pad-like, reaching to middle of abdominal tergite III; venation inconspicuous. Abdominal tergite IX ( Fig. 147 View FIGURES 144 – 148 ) with lateral projection at each basal angle; lateral projection short, narrowed in apical part, obtuse at apex. Valvifer I ( Fig. 152 View FIGURES 149 – 153 ) oblong; valvula I ( Fig. 152 View FIGURES 149 – 153 ) with 4 setae.

Measurements [in mm, ♂ (n=33) /♀ (n=2), holotype in parentheses]. Body length 3.88–4.58/4.67–5.18 (4.40). Head length 0.84–0.95/1.08–1.19 (0.95), width across eyes 0.68–0.74/0.72–0.81 (0.73). Lengths of antennal segments I and II 1.03–1.18/0.82–0.85 (1.18) and 1.02–1.14/0.80–0.83 (1.14). Lengths of rostral segments I and II 0.73–0.78/0.85–0.91 (0.78) and 0.36–0.37/0.42–0.43 (0.37). Pronotum length 0.92–1.05/1.01–1.04 (1.05), width across humeri 1.21–1.37/1.03–1.09 (1.37). Hemelytron length 3.58–3.95/0.96–1.05 (3.90). Lengths of femur and tibia of fore leg 1.09–1.27/1.22–1.28 (1.27) and 1.19–1.35/1.26–1.31 (1.35); of mid leg 1.12–1.26/1.22–1.27 (1.26) and 1.15–1.37/1.30–1.32 (1.37); of hind leg 1.50–1.72/1.70–1.72 (1.72) and 1.62–1.94/1.68–1.72 (1.94). Abdomen length 2.05–2.40/2.70–2.92 (2.39), maximum width 1.73–1.94/2.48–2.55 (1.93).

Holotype. ♂ ( Fig. 47 View FIGURES 41 – 51 ), “[ JAPAN] Shirahama, Iriomote-jima Is., the Ryûkyûs, 23–27.IV.2004, FIT, T. Ishikawa et al.” ( LETUA IC 2014-00185) ( TUA).

Paratypes (32 ♂, 2 ♀). JAPAN [Ishigaki Is.] Mt. Yarabu-dake: 1 ♂, 23–24.v.2001, FIT-M, T. Shimada ( LETUA IC 2014-00186) ( TUA). Shiramizu: 1 ♂, 3–6.v.2004, FIT-M, T. Ishikawa ( LETUA IC 2014-00187) ( TUA). Takeda-rindô: 1 ♂ ( Fig. 117 View FIGURES 114 – 119 ), 10.vi.2003, S. Nagashima ( LETUA IC 2014-00188) ( TUA). Mt. Omotodake: 1 ♂, 1–12.vii.2002, FIT-M, T. Nakata ( LETUA IC 2014-00189) ( TUA). Mt. Nosoko-dake: 1 ♂, 10.vi.2003, T. Ishikawa ( LETUA IC 2014-00190) ( TUA). [Iriomote Is.] Ôtomi-rindô: 1 ♂, 7–11.vi.2002, Malaise trap, T. Tsuru ( LETUA IC 2014-00191) ( TUA). Komi: 1 ♀ ( Figs. 48 View FIGURES 41 – 51 , 68 View FIGURES 65 – 69 , 79 View FIGURES 76 – 80 , 102 View FIGURES 93 – 104 –104), 2.iii.2002, T. Ishikawa ( LETUA IC 2014-00192) ( TUA), 12 ♂ (one shown in Figs. 59, 60 View FIGURES 59 – 64 , 73 View FIGURES 70 – 75 , 99–101 View FIGURES 93 – 104 ), 23–27.iv.2004, FIT-M, T. Ishikawa et al. ( LETUA IC 2014-00193–00204) ( TUA, CAU, NSMT), 3 ♂, 8–12.x.2004, T. Ishikawa et al. ( LETUA IC 2014- 00205–00207) ( TUA), 3 ♂, 7–11.iv.2005, FIT-M, J. Kantoh ( LETUA IC 2014-00208–00210) ( TUA). Aira-gawa Riv.: 1 ♂, 24.v.1999, S. Inada ( LETUA IC 2014-00211) ( TUA), 1 ♂, 28.iv.2003, T. Kurihara ( LETUA IC 2014- 00212) ( TUA), 1 ♂, 2.v.2003, T. Kurihara ( LETUA IC 2014-00213) ( TUA). near Yuchin-gawa Riv.: 2 ♂, 11–13.ix.2003, K. & S. Arai ( LETUA IC 2014-00214–00215) ( TUA). Kanpira-no-taki: 1 ♀ ( Figs. 147 View FIGURES 144 – 148 , 152 View FIGURES 149 – 153 ), 2.v.1999, S. Arai & K. Toyoda ( LETUA IC 2014-00216) ( TUA). Shirahama: 3 ♂ (one shown in Figs. 123 View FIGURES 120 – 125 , 129, 135, 141), same data as holotype ( LETUA IC 2014-00217–00219) ( TUA).

Distribution. Japan: Ryukyu Islands (Ishigaki Is., Iriomote Is.).

Etymology. Based on the name of the island group that includes Ishigaki Island and Iriomote Island; an adjective.

Remarks. Macropterous males and micropterous females of this species are known. In general appearance, this new species resembles A. albula sp. nov. However, A. yaeyamensis sp. nov. is distinguished from A. albula sp. nov. by its larger body (3.8–5.2 mm vs. 2.7–3.2 mm), the mandibular plate acutely angled at the anterior corner and strongly projected anteriorly in dorsal view ( Fig. 60 View FIGURES 59 – 64 ) [vs. nearly right-angled at the anterior corner and weakly projected anteriorly in dorsal view ( Fig. 54 View FIGURES 53 – 58 )], rostral segment I approximately twice as long as segment II ( Figs. 73 View FIGURES 70 – 75 , 79 View FIGURES 76 – 80 ) [vs. 1.4–1.5 times longer than segment II ( Figs. 70 View FIGURES 70 – 75 , 76 View FIGURES 76 – 80 )], and the posterior process of the pygophore narrow with a rounded apical margin in dorsal view (Fig. 129) [vs. wide with a straight apical margin in dorsal view (Fig. 126)].

Most specimens (15 individual) of A. yaeyamensis sp. nov. were collected from FIT-Ms placed in Komi, Iriomote Island. This new species was found simultaneously with A. albula sp. nov. and A. nakatai sp. nov. This observation implies that these three species sympatrically inhabit leaf litter of moist forests in the Yaeyama group of the Ryukyu Islands.