Stenoscelis ogasawarensis Inoue, 2025

Stenoscelis ogasawarensis Inoue sp. nov.

[New Japanese common name: Ogasawara-kuchibuto-kikui-zômushi]

urn:lsid:zoobank.org:act:38985418-2B73-4F8B-A750-9644AED87A7E

( Figs 46, 47 View FIGURES 40–47 , 62–67 View FIGURES 58–62 View FIGURES 63–67 & 77 View FIGURE 74–77 )

Diagnosis. Stenoscelis ogasawarensis is very similar to S. matobai , S. reniformis , and S. gracilitarsis , but can be distinguished from them by the sclerotized structure on the subapical part of endophallus being ovate, flat, with a pair of long projections dorsally, and separated basally ( Fig. 63–64 View FIGURES 63–67 ).

Description. Body length 2.8–3.3 mm; black, rather shiny; mouth parts, antennae, tarsi, and apical part of tibiae reddish brown; setae yellowish brown.

Rostrum 0.6 times as long as wide; dorsum convex; dorsal surface reticulate, rugosely punctate; punctures small, separated by interspace approximately 1–2 times as long as diameter; upper margin of scrobe directed to lower margin of eye; epistome with six long setae basally, with anterior margin obtusely projected at right side. Head with dorsal surface reticulate, smoothly punctate; punctures small, separated by interspace approximately 2–4 times as long as diameter; interocular area with a shallow fovea; eye round, hardly convex.

Antennae with club subcircular, slightly wider than long; funicle 7-segmented, slightly longer than club.

Prothorax 1.0 times as long as wide, widest before base, gradually narrowed anteriorly, weakly sinuate laterally; anterior margin weakly sinuate in middle or not; subapical constriction distinct on lateral side, obsolete on dorsal side; disc reticulate, rugosely punctate; punctures medium, separated by interspace almost as long as or narrower than diameter.

Elytra 1.8 times as long as wide, 1.0–1.1 times as wide as and 2.0 times as long as prothorax, subparallel, conjointly rounded at apex; apex obtusely angulated in lateral view; striae rather deep, with medium punctures separated by interspace approximately 1–2 times as long as diameter; apical part of striae moderated, not dilated or reticulate; second stria distinctly separated from base; intervals somewhat convex, with an irregular row of small puncture; base of second to third or fourth interval rugosely punctate-granulate; apical half of ninth interval and tenth interval carinate; granules of intervals arranged in a single row, indistinct basally, distinct and conical on declivity; setae on declivity arranged irregularly in one or two rows, as long as or shorter than granules.

Aedeagal body 1.7 times as long as wide, 0.8 times as long as apodeme, subparallel, gradually narrowed and weakly prolonged apically; apodeme attached laterally; endophallus with a large sclerotized structure on dorsal side of subapical part; the structure ovate, flat, with a pair of long projection on dorsal side, with long hairs, with a separated part basally; tegmen without dorsal part and paramere, with distinct manubrium; spiculum gastrale abruptly curved to right side apically, not expanded apically; sternite VIII divided, with several long setae apically; without spinulate apical membranous area.

Spiculum ventral not bifurcate at base; spermatheca with cornu falciform; collum not developed; ramus not developed.

Distribution. Japan: Ogasawara Islands (Otoutojima Is., Chichijima Is., and Hahajima Is.)

Biological note. The adults emerged from the dead broad-leaved trees: Cinnamomum yabunikkei H. Ohba , Distylium lepidotum Nakai , and Ardisia sieboldii Miq.

Etymology. The new species is named after the type locality, the Ogasawara Islands.

Type material. Holotype ( Figs 46 & 47 View FIGURES 40–47 ): male ( KUM), “( Ogasawara Isles ) / Mt. Chuo / Chichi-jima I. / 30.VII.1996 emer. / H. Kamezawa / シマイスノキ ” (white card); “HOLOTYPE / Stenoscelis / ogasawarensis / des. S. Inoue, 2024” (red card) . Paratypes: Ogasawara Isls.: Otoutojima .: 1 male, Ichinotani 26.IV.1997, T. Kishimoto leg. ( KUM) ; 1 male, Ainosawa , 9.VII.1997, T. Matsumoto leg. ( KUM) ; Chichijima Is. : 1 male, Kitafukurosawa , 7.VII.1976, H. Irie leg. ( KUM) ; 2 male, Chuôzan , 8.VII.1976, H. Irie leg. ( KUM) ; 1 unsexed, Chûô-zan , emerged from dead tree of Distylium lepidotum Nakai , 8.I.1996, em. 26.V.1996, H. Kamezawa leg. ( KUM) ; 2 unsexed, ditto, emerged from dead tree of Distylium lepidotum Nakai , 8.I.1996, em. 15.VI.1996, H. Kamezawa leg. ( KUM) ; 1 male, ditto, emerged from dead tree of Distylium lepidotum Nakai , 8.I.1996, em. 24.VII.1996, H. Kamezawa leg. ( KUM) ; 3 unsexed, ditto, emerged from dead tree of Distylium lepidotum Nakai , em. 27.VII.1996, H. Kamezawa leg. ( KUM) ; 1 unsexed, ditto, emerged from dead tree of Distylium lepidotum Nakai , em. 30.VII.1996, H. Kamezawa leg. ( KUM) ; 1 male, 1 female, ditto, emerged from dead tree of Distylium lepidotum Nakai , 8.I.1996, em. 1.IX.1996, H. Kamezawa leg. ( KUM) ; 1 male, ditto, emerged from dead tree of Distylium lepidotum Nakai , 8.I.1996, em. 5.IX.1996, H. Kamezawa leg. ( KUM) ; 1 male, Mt. Asahiyama , 9.IX.1997, H. Kamezawa leg. ( KUM) ; 1 male, Higashidaira , 24.I.1997, T. Matsumoto leg. ( KUM) ; 1 male, Mt. Chuoh , 16.III.1999, K. Morimoto leg. Hahajima Is. : 3 male, 1 femlae, 6 unsexed, bred from dead tree of Ardisia sieboldii Miq , 6.VII.1995, H. Makihara leg., ( KUM) ; 1 male, 9 unsexed, Kohmoridani , bred from dead tree of Cinnamomum yabunikkei H.Ohba , 6.VII.1995, H. Makihara leg., ( KUM) ; 1 male, 1 unsexed, Kuwanoki-yama , bred from dead tree of Cinnamomum yabunikkei H.Ohba , 8.VII.1995, H. Makihara leg., ( KUM) ; 1 male, Chibusayama , 4.VIII.1996, T. Matsumoto leg. ( KUM) ; 1 male, Mt. Chibusayama , 17.VI.1999, K. Morimoto leg., ( KUM) ; 1 male, 1 female, Mt. Chôki-yama , alt. 200 m, 15.VI.2023, I. Kawashima leg. ( KUM) .

Remarks. Stenoscelis ogasawarensis is the first representative of the genus Stenoscelis from the Oceanian region.