Gametis polita Seshima & Yoshida, 2025

Gametis polita Seshima & Yoshida , sp. nov.

[Japanese name: Hisui-koao-hanamuguri]

( Figs. 1–11 View FIGURES 1–11 , 28–29 View FIGURES 28–35 )

Type locality. Mitsuse park, Tarama-jima Is., the Miyako Isls., Okinawa-ken, Japan.

Type material. Holotype, ♂ ( Figs. 1–7 View FIGURES 1–11 ). [ JAPAN] Mitsuse park, Tarama-jima Is., the Miyako Isls. , Okinawa-ken, 21–24. VI. 2024, Fubito Aizawa leg. ( EUMJ) . Paratypes: (3 ♂♂, 82 ♀♀). [ JAPAN] 64 ♀♀ ( EUMJ, PCKW, PCYS, PCKS), Tarama-jima Is. , Tarama-son, the Miyako Islands, Okinawa pref., 1. IV. 1983, Kaoru Wada leg. ; 3 ♂♂, 13 ♀♀ ( EUMJ, PCYS), same data as holotype ; 1 ♀ ( PCYS), Shiokawa, Tarama-jima Is. , 14. VI. 2025, Yûhi Seshima leg. ; 4 ♀♀ ( PCYS), near Miyako Minna Island Lighthouse, Minna-jima Is. , 20. VI. 2024, Fubito Aizawa leg.

Description. Holotype, male ( Figs. 1–7 View FIGURES 1–11 ). Body oval, without tomentum; body length measured from anterior margin of clypeus to elytral apex 13.98 mm; maximum width measured around humeri 7.57 mm. Color glossy green, enamel-like, with several white round maculae; head mostly green, with anterior margins tinged slightly pale red; antennae reddish brown to black; pronotum, scutellum, and elytra glossy, green to pale red; pronotum with longitudinal white macula present along each lateral declivity, with an additional pair of small inner white spots medially; elytra with four white maculae arranged along each outer margin, with two additional ones on each middle area; pygidium glossy black and slightly greenish, with four conspicuously large white maculae; venter mostly glossy, green, with a faint reddish tint; prosternum glossy black; mesosternum with large white maculae along each lateral margin; abdominal ventrites 1, 2, and 5 with single pair of white maculae, 3 and 4 with two pairs of white maculae; protibiae shiny green anteriorly and dark shiny green posteriorly; meso- and metatibiae dark green; tarsi dark reddish brown to black with a greenish tint and glossy.

Head ( Figs. 1–2 View FIGURES 1–11 ). Symmetrical and elongate; dorsal surface moderately shiny and sparsely punctated; interocular width equals 5.3 transverse eye diameters; median side depression. Clypeus with anterior margin deeply depressed at middle, with sparser punctures evenly distributed; apex slightly reflexed dorsally. Frons laterally with punctures coarser and slightly denser than those on clypeus, medially with sparser punctures but similar in size to those on clypeus. Eyes large, laterally protruding, partially covered by an elongate eye-canthus extending laterad. Antennal club approximately as long as the footstalk.

Pronotum ( Fig. 1 View FIGURES 1–11 ). Trapezoidal, approximately as long as wide, moderately convex dorsally, with gently curved lateral margins with posterior margin weakly and roundly emarginate at middle; surface entirely glabrous. Punctation composed of a mixture of coarse and fine punctures, becoming sparser and finer on posteromedial area. A distinct longitudinal white macula is present along each lateral declivity, with an additional pair of small inner white spots medially.

Scutellum ( Fig. 1 View FIGURES 1–11 ). Triangular with length 1.2 times as long as width, elongate, nearly flat; surface moderately shiny, smooth, without punctures, entirely glabrous.

Elytra ( Fig. 1 View FIGURES 1–11 ). Somewhat elongate, with a broad base, largely glabrous but distally with some short setae on declivity. Two distinct costae on each elytron extending from middle to the distal declivity, meeting each other at distal end. Punctures on outer areas large and moderately dense, occasionally contiguous and forming C- or Ushaped impressions; punctures on inner areas somewhat large and sparser, notably sparse around scutellum.

Pygidium ( Fig. 4 View FIGURES 1–11 ). Broad, pentagonal; surface flat, coarsely and densely, rugose in part.

Venter ( Figs. 2–3 View FIGURES 1–11 ). Prosternum broad, densely rugose. Mesosternum broad densely with punctures sometimes contiguous and forming wavy or C-shaped impressions; mesosternal process developed and broadly rounded. Abdomen with 2–3 transverse rows of C-shaped punctures on each ventrite; ventrite 6 noticeably short and compressed, protruded ventrally.

Legs ( Figs. 1–2, 7 View FIGURES 1–11 ). Femora densely covered with long setae. Protibiae apically with two distinct outer teeth, with one rudimentary outer tooth at middle; posterior surface with three longitudinal grooves, apically with one well-developed spur. Meso- and metatibiae each equipped with two well-developed apical spurs. Length ratios of tarsomeres I–V approximately 1.0: 1.7: 1.6: 1.6: 2.0; tarsomere I short, tarsomeres II–V elongate; claws slender and simple.

Aedeagus ( Figs. 5–6 View FIGURES 1–11 ). Parameres elongate and symmetrical; sub-apices without any distinct swelling; apices curved outward. Each paramere with outer margins shallowly depressed at just after middle.

Sexual dimorphism ( Figs. 8–11 View FIGURES 1–11 ). Females differ from males as follows: third outer tooth of protibia well-developed; abdominal ventrite 6 not protruded ventrally.

Variability ( Figs. 1–11 View FIGURES 1–11 ). Body length measured from anterior margin of clypeus to elytral apex 11.96–15.53 mm, maximum width measured around humeri 6.07–8.10 mm (n = 20, including both sexes). The body color ranges from green to deep green, pale reddish green and shiny. Maculae ranges from white to light yellowish brown, occasionally with a small macula on scutellum; One or two small maculae sometimes present at base of elytron, sometimes absent in some individuals; one or two pairs of maculae sometimes occurring on abdominal ventrites 1 to 5, but sometimes absent in some specimens. Dorsal surface of elytra either glabrous or bears sparse setae in some individuals.

Etymology. The specific epithet “polita ” refers to the glossy green appearance of this new species, a distinguishing morphological characteristic.

Distribution. Japan: Ryukyu Islands: Miyako Islands (Tarama-jima Island, and Minna-jima Island) ( Fig. 38 View FIGURE 38 )

Differential diagnosis. This new species is morphologically similar to G. forticula ( Figs. 12–16 View FIGURES 12–21 , 30–31 View FIGURES 28–35 ) and G. ishigakiana ( Figs. 17–27 View FIGURES 12–21 View FIGURES 22–27 , 32–35 View FIGURES 28–35 ) but is identified by the following combination of characteristics ( Figs. 1–11 View FIGURES 1–11 , 28–29 View FIGURES 28–35 ): absence of tomentum on the dorsum; body enamel-like glossy; punctures on elytra large ( Figs. 28–29 View FIGURES 28–35 ); denser punctation around the scutellum compared to G. ishigakiana yonakuniana ( Figs. 29, 35 View FIGURES 28–35 ); subapical part of parameres lacking any distinct swelling laterally ( Fig. 6 View FIGURES 1–11 ).

Remarks. In Tarama-jima Island, G. ishigakiana is distributed sympatrically with this new species. The two species were distinguished based on their external morphology.

This new species was collected from the flowers of Premna serratifolia L. ( Fig. 36 View FIGURE 36 ).