Mimofulvius castaneus Wolski & Yasunaga, 2025, sp. nov.

Mimofulvius castaneus sp. nov. urn:lsid:zoobank.org:act: 1C3604E4-0AC4-42D9-B521-50EA19F2A5A5 Figs 1, 3–13, 16–17, 26–27, 50; Table 1 Diagnosis Currently known only by male specimens. Recognized by its shiny castaneous body; pronotum with narrow, distinct, yellow stipe along posterior margin (Figs 1, 16, 26–27); male genitalia as described below (Figs 3–5). These characters enables this species to be readily distinguished from the other congener, M. pentatomus (see below). Etymology From Latin, ‘ castaneus ’ (‘castaneous brown’), referring to the basic body coloration of this new species. Type material Holotype THAILAND • ♂; Nakhon Ratchasima, Wang Nam Khiao, Sakaerat Environmental Research Station (SERS); 14°30′27″ N, 101°55′39″ E; 410 m alt.; 17 Mar. 2010; T. Yasunaga leg.; UV (mercury) light trap; DOAT, AMNH _ PBI 00380662. Paratypes THAILAND • 1 ♂; same data as for holotype; 18 Mar. 2010; T. Yasunaga leg.; UV light trap; TYCN • 1 ♂; same data as for holotype; 15 Sep. 2008; T. Yasunaga leg.; UV light trap; TYCN • 1 ♂; same data as for holotype; 12–14 Jun. 2009; Yasunaga and Yamada leg.; UV light trap; TYCN. Description Male COLORATION. Dorsum castaneous with yellow areas (Figs 1, 16, 26–27). HEAD. Castaneous broadly tinged with dark brown on vertex, frons, and clypeus (Figs 1, 16–17, 26–27); antenna dark yellowish brown with dark brown, narrow annulations on apices of all segments and apex of basal half of subdivided segment IV (Figs 1, 16–17, 26–27); labium yellowish brown (Fig. 17). THORAX. Pronotum. Castaneous with distinct, narrow, yellow stipe along posterior margin (Figs 1, 16, 26–27). Mesoscutum and scutellum. Dark castaneous (Figs 1, 16, 26–27). Thoracic pleura. Proepimeron and proepisternum castaneous; remaining pleura dark yellowish brown; metathoracic scent gland evaporative areas and peritreme contrastingly yellow (Fig. 17). Hemelytron. Castaneous, with large pale-yellow patch above cuneus (Figs 1, 16, 26–27). Legs. Procoxa castaneous; meso- and metacoxae yellow; remaining segments dark yellowish brown (Figs 1, 16–17, 26–27). ABDOMEN. Dark castaneous (Fig. 17). STRUCTURE, TEXTURE, AND VESTITURE. Body 2.8–3.1 times as long as wide, 3.1 times as long as posterior width of pronotum. Dorsum shiny, covered with sparse, erect and semirecumbent setae (Figs 1, 6–8). Thorax. As in generic description. Hemelytron. Exocorial edge as in Fig. 8. Legs. Relatively long; metafemur with three narrow keels that are considered as plectra for stridulation (Fig. 13). MALE GENITALIA. Left paramere. Apical process narrowed toward apex, sharply pointed (Fig. 3). Endosoma. Membranous medial lobe occupying half of endosoma; left sclerite (ls) short, narrowed toward apex; right sclerite (rs) long, originating near base of sclerotized portion of seminal duct and terminating at basal two thirds of endosoma (Fig. 4). Measurements See Table 1. Female Unknown. Biology Unknown; all available specimens (e.g., Figs 26–27) were collected by UV lighting method (using mercury lamps). Distribution Thailand (Nakhon Ratchasima) (Fig. 50).