Parasyntrophus Riedel, 2024

Riedel, Alexander, 2024, Taxonomic review of weevils of the tribe Celeuthetini, mainly from Sundaland, Sulawesi and the Lesser Sunda Islands (Coleoptera, Curculionidae, Entiminae), Zootaxa 5464 (1), pp. 1-75 : 47

Parasyntrophus Riedel gen. n.

http://zoobank.org/ urn:lsid:zoobank.org:act:9602EA39-6C44-427D-AF85-DB6431E7DE5C

Type species: Idiopsis radiatifrons Heller, 1914 , by present designation.

Description. Integument covered with appressed, microgranulate scales; elytra at least on declivity with rows of long erect clavate scales. Head with angulate or curved transverse sulcus separating rostral base; vertex with radial furrows sometimes more or less obscured by scales. Eyes protruding, asymmetrically convex, drawn posteriad; separated from apex of prothorax by ca. length of eye. Profile ( Fig. 40d ) anteriorly with marked constriction. Rostrum with dorsum between antennal scrobes narrow; posteriorly with distinct glabrous costa; apical declivity with sunk-in scales, weakly impressed; dorsal profile convex to subangulate. Antenna. Scape stout; in cross-section subrotund; with appressed scales and with interspersed long, curved, suberect scales. Funicle with article 2 subequal or longer (1.0–1.5 X) than article 1. Pronotum as long as, or slightly longer than wide; coarsely punctate. Metanepisternum narrow, sometimes concealed by scales. Elytra subovate, with 10 striae. Legs. Protibia ventrally simple, not denticulate. Venter. Procoxae approximate, separated by 0.15 X procoxal diameter; distance to apex 0.5 X distance to base of prothorax. Mesoventral process elongate, ca. 1.50 X as long as posterior width. Abdomen. Female ventrites 3–5 exposed, laterally half as long (0.5 X) as ventrites 1–2. Genitalia. Penis ( Figs. 26b , 27b , 28b ). Apodeme firmly attached to body. Transfer apparatus flagelliform, ca. 2–3 X as long as body of penis, subapically extremely thin.

Etymology. The name is a combination of the Greek prefix para- (next to, near by) and the genus name Syntrophus . The gender is masculine.

Notes. This group of species from Bali plus one undescribed species from Lombok is related to Syntrophus Marshall , but differs by its 10 elytral striae, more asymmetrically shaped eyes, and an elongate mesoventral process. Furthermore, the genus Apirocalodes Voss , is the closest relative of Syntrophus Marshall according to our latest molecular phylogenetic reconstructions. Idiopsodes Thompson , a replacement name of the genus to which these species were originally assigned to is completely unrelated and deeply nested in a clade of genera from New Guinea. The description of a new genus is the best solution to resolve these issues.

Key to the species of Parasyntrophus gen. n.

1 Elytra dorsally flattened; interval 6 with lateral ridge, bearing fringe of long erect scales. Penis apically simple, not widened. Fig. 27a ............................................................ Parasyntrophus radiatifrons ( Heller, 1914)

1´Elytra dorsally convex. Penis subapically widened........................................................... 2

2 (1´) Elytra from base to apex with long, erect, subclavate scales. Fig. 26a ............... Parasyntrophus gitgitus ( Heller, 1914)

2´Elytra with long, erect scales limited to apical declivity. Fig. 28a ................ Parasyntrophus setosapex ( Heller, 1914)

Figures

FIGURE 26. Parasyntrophus gitgitus (Heller). Idiopsodes gitgitus (Heller), lectotype: (a) Habitus (b) Penis (c) Labels.

FIGURE 27. Parasyntrophus radiatifrons (Heller). Idiopsodes radiatifrons (Heller), lectotype: (a) Habitus (b) Penis (c) Labels.

FIGURE 28. Parasyntrophus setosapex (Heller). Idiopsodes setosapex (Heller), lectotype: (a) Habitus (b) Penis (c) Labels.

FIGURE 40. Celeuthetini, head in profile: (a) Bonthaina solitaria Heller, lectotype (b) Heteroglymma biramosum (Motschulsky) (c) Apotomorhamphus parcesetosus Voss, paratype (d) Parasyntrophus radiatifrons (Heller) (e) Syntrophus carinicollis (Heller) (f) Idiopsodes griseus (Faust) (g) Temnogastrus javanus (Faust) (h) Piezonotus suturalis Gyllenhal.