Heteroglymma biramosum (Motschulsky)

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 : 26

Heteroglymma biramosum (Motschulsky)

Trigonops biramosus Motschulsky, 1859: 102–103 . Type locality: Sunda Islands .

Trigonops jekeli Pascoe 1860: 128 , pl. VII, fig. 9. Type locality: Manado. Synonymy by Faust (1897).

Description. Syntype, male ( Fig. 13d, e ). Length. Pronotum plus elytron 5.90 mm. Integument dark black, femora dark ferruginous, sparsely covered with appressed, grey scales. Head with curved furrow separating swollen rostral base; forehead with indistinct median furrow; vertex squamose, laterally and anteriorly with shallow furrows. Eyes evenly convex. Rostrum 1.33 X longer than wide, sides subparallel; dorsum in basal half with shallow median impression. Antenna. Funicle with article 2 1.8 X longer than article 1. Pronotum subglobose, 1.01 X longer than wide; laterally coarsely punctate and squamose, medially granulate, subglabrous. Elytra 1.04 X as long as wide (excluding extensions), above declivity with pointed posterolateral extensions; sparsely covered with dull bluish scales; punctures coarse, intervals transversely corrugate; with inconspicuous rows of subrecumbent, narrow bristles. Legs. Protibia ( Fig. 13b ). Genitalia. Penis ( Fig. 13c ) Intraspecific variation. Length. Pronotum plus elytron 5.65–6.25 mm. Female elytra with posterolateral extensions cone shaped, much shorter than in males.

Material examined. Type specimen. Trigonops biramosus Motschulsky , syntype, male ( Fig.13a ): INDONESIA, “ Celebes ”; labels ( Fig. 13f ); condition: pinned, somewhat moldy ( ZMMU). Other material examined: N-Sulawesi: 1 ex ( Fig. 13a–c , ARC3560 , EMBL # LN866376), N-Sulawesi, Tomohon, Rurukan, Gn. Mahawu, N01° 21.409´E124° 51.535´to N01° 21.370´E124° 51.676´, 1126–1231 m, 14-V-2012 ( SMNK) ; 9 exx, Tomohon, Gn. Mahawu, 1150–1200 m, 30-XI-1999.

Notes. Photographs of the only syntype available, kindly provided by V. Savitsky (Moscow) were examined. The syntype is somewhat moldy, so it appears unlikely that DNA sequences could still be obtained. The type locality is stated as “ Celebes ”. Based on external characters and the consideration that the most likely collecting site at the time was near Manado , specimens from Tomohon were identified as this species .

Figures

FIGURE 13. Heteroglymma biramosum (Motschulsky), a–c, Tomohon: (a) Habitus (b) Protibia (c) Penis; d–f, syntype, by V. Savitsky (Moscow): (d) Habitus in profile (e) Habitus in dorsal aspect (f) Labels.