Plautia ishigaki Ishikawa & Moriya 2019
Creators: name: Ishikawa, Tadashi
name: Moriya, Seiichi
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Plautia
Plautia ishigaki

description: Plautia ishigaki Ishikawa & Moriya, sp. nov.
(Figs. 5, 18, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77, 84)
Diagnosis. Among the species of Plautia, this pentatomid is recognized by the following combination of characters: body 6.7–8.8 mm long, glossed (Fig. 5); antennal segment III blackish in apical 1/3 (Fig. 5); antennal segment IV blackish in apical half (Fig. 5); punctures on disc of pronotum and scutellum brownish and weak, sparser and much smaller than punctures on coria of fore wings (Fig. 18); lateral margins of pronotum brownish and weakly edged (Figs. 18, 27); brownish line of lateral margin of pronotum irregularly interrupted (Fig. 27); transverse ridge of genital capsule visible from ventral rim in ventral view (Figs. 32); lateral lobe of crown of paramere strongly extended laterad, nearly truncate at apex, with roundly concave distal and proximal margins (Fig. 47); conjunctival processes of endosoma thick and short, curved ventrad (Figs. 52, 57, 62, 67); processes of vesica Y-shaped in ventral view, roughly heart-shaped in outline in posterior view (Figs. 57, 67); sclerotized zone of intermediate part of spermatheca approximately 1/8 as long as intermediate part (Fig. 84).
Description. Male. Coloration. Body generally yellowish green, glossed (Fig. 5). Punctures on pronotum and scutellum generally brownish and punctures on coria generally blackish (Fig. 18). Head with short longitudinal blackish line above anteniferous tubercle (Fig. 27). Antennal segments I and II yellowish green; segment III yellowish green to brownish yellow in basal 2/3 and blackish in apical 1/3; segment IV yellowish green to brownish yellow in basal half and blackish in apical half; segment V brownish yellow in basal 1/3 and in apical 1/ 5, and blackish from basal 1/3 to apical 1/5. Labium brownish yellow, with blackish apical part. Pronotum brownish along lateral margins (Fig. 27); brownish line of lateral margin sometimes irregularly interrupted or partly obscure. Apical part of scutellum whitish (Figs. 5, 18). Corium of fore wing except antero-marginal area greyish pale yellow, with a few obscure irregular markings (Figs. 5, 18); membrane of fore wing transparent, tinged with pale brown (Fig. 5). Legs yellowish green; tarsi yellowish green to brownish yellow; claws brownish yellow in basal half and black in apical half; pulvilli dark brown, tinged with green. Posterolateral corners of abdominal segments III to VII narrowly and distinctly dark brown.
Structure. Head finely punctate, weakly and densely rugose, a little more than 3/4 as long as width across eyes; interocular space approximately 3 times as wide as eye in dorsal view. Bucculae roundly convex ventrad in anterior 1/3, pointed at anterior 1/5, gradually tapering posteriad in posterior 2/3. Antenna 3/4 as long as body length (to apex of abdomen), sparsely covered with short, erect and suberect setae in segments I, II and basal half of III, and densely in segments IV, V and apical half of III; approximate proportion of segments I to V 1.0: 1.7: 2.0: 2.9: 3.1. Labium reaching abdominal segment III; approximate proportion of segments I to IV 1.0: 1.6: 1.4: 1.1.
Pronotum (Fig. 18) along midline approximately 1.2 times as long as head, approximately 2/5 as long as humeral width; disc of pronotum punctate; these punctures small and weak (Fig. 18); width across humeri 2.2 times as much as width across eyes; humeral angle round, slightly projected laterad; lateral margin straight, weakly edged, with sparse fine setae. Scutellum (Fig. 18) as long as its basal width, punctate as in pronotum. Fore wings exceeding apex of abdominal segment VII by approximately 1/10 of its length (Fig. 5); punctures of coria denser and much larger than punctures of pronotum and scutellum (Fig. 18).
Abdomen (from base of segment III to apex of segment VII) approximately 7/10 as long as its maximum width. Genital capsule (Figs. 37, 42) approximately 2.3 times as wide at maximum as its basal width, as long as its maximum width, roundly produced at posterior angles; ventral rim (Figs. 32, 37) widely and roundly concave; concavity of ventral rim approximately 1/5 as deep as its maximum width (Fig. 37); transverse ridge well developed, visible from ventral rim in ventral view (Fig. 32), with gently concave dorsal margin in posterior view (Fig. 42); dorsal sclerites semitriangular, with acute ventral angle (Fig. 42); dorsal sinus subpentagonal in posterior view (Fig. 42); paramere sockets circular in posterior view (Fig. 42). Crown of paramere (Fig. 47) subpentagonal, covered with long setae on lateral lobe, round at apex; inner margin straight; distal and proximal margins roundly concave; lateral lobe strongly extended laterad, truncate at apex. Conjunctival processes of endosoma (Figs. 52, 57, 62, 67) thick and short, curved ventrad, tapering, obtuse at apex. Vesica gently curved in lateral view (Fig. 62). Processes of vesica relatively small, Y-shaped in ventral view (Fig. 57), circular in lateral view (Fig. 62), roughly heart-shaped in outline in posterior view (Fig. 67).
Female. Similar to the male. Body relatively larger than male. Valvifer VIII generally yellowish green (Fig. 72), covered with short to long setae in apical half (Fig. 77); apical angle a little more acute than right angle (Fig. 77). Spermatheca long; apical receptacle (Fig. 84) spherical, with 1 horn-shaped process; horn-shaped process produced laterad of apical receptacle, abruptly curved basad, exceeding distal flange; intermediate part (Fig. 84) parallel-sided, approximately 4.5 times as long as its width at middle, with sclerotized zone apically; apical sclerotized zone of intermediate part approximately 1/8 as long as intermediate part (Fig. 84); distal flange a little narrower than proximal flange (Fig. 84).
Measurements [in mm, ♂ (n=7) / ♀ (n=16). Body length 6.7–7.8 (holotype 7.4) / 7.5–8.8; width across eyes 2.1–2.4 / 2.3–2.5; width across humeral width 4.7–5.3 / 5.1–5.8; maximum width of abdomen 4.6–5.1 / 5.1–5.3.
Type series. Holotype: ♂ (Fig. 5), “[JAPAN] Hirae-Chisokobaru, Ishigaki-jima Is., the Ryukyus, N24.3825 E124.1917, 15. IX. 2010, light trap, Hirosato Kodama” (LETUA IC 2018-00001) (TUA).
Paratypes (6♂ 16♀). JAPAN, the Ryukyu Islands, Ishigaki-jima Is. —same locality as holotype: 1♂ 1♀, 24. IX. 2008, Tsunaki Ando (LETUA IC 2018-00002–00003) (TUA), 1♂, 13. VII. 2010, Hirosato Kodama (LETUA IC 2018-00004) (TUA), 1♀, 6. IX. 2010, Hirosato Kodama (LETUA IC 2018-00005) (TUA), 1♀, 4. X. 2010, Hirosato Kodama (LETUA IC 2018-00006) (TUA), 1♀, 10. X. 2010, Hirosato Kodama (LETUA IC 2018-00007) (TUA), 1♀, 30. VI. 2013, Rie Ukuda (LETUA IC 2018-00008) (TUA), 1♀, 25. VII. 2013, Rie Ukuda (LETUA IC 2018-00009) (TUA), 1♂, 15 VIII. 2013, Rie Ukuda (LETUA IC 2018-00010) (TUA), 1♂, 20. VIII. 2013, Rie Ukuda (LETUA IC 2018-00011) (TUA), 1♂, 24. VIII. 2013, Rie Ukuda (LETUA IC 2018-00012) (TUA), 3♀, 25. VIII. 2013, Rie Ukuda (LETUA IC 2018-00013–00015) (TUA), 1♀, 8. IX. 2013, Rie Ukuda (LETUA IC 2018- 00016) (TUA), 1♀, 9. IX. 2013, Rie Ukuda (LETUA IC 2018-00017) (TUA); — Hirae, 24.38284N 124.19233E: 1♀, 22. VII. 2012, collector unknown (LETUA IC 2018-00018) (TUA), 1♀, 1. VIII. 2 0 17, Ayako Yamaguchi (LETUA IC 2018-00019) (TUA), 1♀, 3. VIII. 2 0 17, Ayako Yamaguchi (LETUA IC 2018-00020) (TUA), 1♂, 3. IX. 2017, Ayako Yamaguchi (LETUA IC 2018-00021) (TUA); — Hirae, 24.38904N 124.19505E: 1♀, 23. VI. 2017, Kiichi Shimizu (LETUA IC 2018-00022) (TUA), 1♀, 30. VIII. 2017, Kiichi Shimizu (LETUA IC 2018- 00023) (TUA). All the paratypes were collected by light traps.
Distribution. Ishigaki-jima Island of the Ryukyu Islands, Japan.
Etymology. The specific epithet is named for the type locality, Ishigaki-jima Island, one of islands in the Ryukyu Islands, Japan; a noun in apposition.
Remarks. In general appearance, this new species is very similar to P. crossota (Dallas, 1851). However, P. ishigaki sp. nov. is distinguished from P. crossota by its relatively smaller body length (6.7–8.8 mm vs. 8.0–11.0 mm), the lateral margins of pronotum brownish (Fig. 27) (vs. blackish), the middle part of the ventral rim of genital capsule roundly concave (Fig. 32) (vs. slightly convex), and the lateral lobe of the crown of paramere truncate at apex (Fig. 47) (vs. triangularly projected).
description: Published as part of Ishikawa, Tadashi & Moriya, Seiichi, 2019, A review of the stink bug genus Plautia Stål from Japan (Hemiptera, Heteroptera, Pentatomidae), pp. 470-490 in Zootaxa 4564 (2) on pages 485-487, DOI: 10.11646/zootaxa.4564.2.8, http://zenodo.org/record/2589359