Trachyphloeosoma philippinense Borovec & Anderson, 2022

Borovec, Roman & Anderson, Robert, 2022, Three new species of Trachyphloeosoma Wollaston (Coleoptera: Curculionidae Entiminae) from southeast Asia with the first record of the tribe Trachyphloeini from the Philippines, Zootaxa 5182 (1), pp. 93-100 : 98-99

Trachyphloeosoma philippinense Borovec & Anderson spec. n.

( Figs 3 , 17–21 )

Type locality. Philippines, Palawan, Magara, Roxas .

Type material. Holotype: ♂, ‘ PHILIPPINES: Palawan, Magara, Roxas , Nov 2020, local collectors’ ( CMNC) . Paratypes: same data as holotype (3 ♀ CMNC, 1 ♀ NMPC); ‘Roxas, Jun 2021 ’ (1 ♀, 1 ♂ CMNC) ; ‘ Eastern Visayas, Northern Samar, Lope de Vega , Jun 2021 ’ (1 ♂, CMNC) .

Description. Body length: holotype 1.69 mm, paratypes 1.94–2.02 mm. Body ( Fig. 3 ) dark brown, antennal scapes and femora reddish brown, funicles with clubs and tarsi yellowish brown. Entire body except for frons, antennal funicles with clubs, apical parts of tibiae and tarsi covered with grey, earth-like encrustation concealing most of surface. Appressed scales hardly visible, structure not visible. Elytra with one conspicuous dense row of erect setae. Setae slender, very feebly subspatulate, slightly enlarged apicad, widest at tip, almost as long as width of one interstria, distance between two setae slightly longer than length of one seta. Pronotum and head with rostrum with similar setae, but half as long as those of elytra, irregularly scattered, directed anteriad. Antennal scapes, funicles, femora and tibiae with moderately long, fine, conspicuously erect setae.

Rostrum ( Figs 17, 18 ) very short, wide, 1.71–1.75 × as wide as long, widest at base, evenly tapering apicad with straight sides; in lateral view weakly vaulted, frons declinate. Epifrons short, wide, with distinctly concave sides, with shallow, ill-defined longitudinal median groove, concealed by encrustation. Frons very short, impunctate, shiny, sharply separated from squamose epifrons. Epistome ill-defined, vaguely distinguished from frons. Antennal sockets in dorsal view clearly visible as moderately wide, parallel-sided, slightly curved furrows; in lateral view short, wide, subtriangular, distinctly enlarged distad, with dorsal margin directed above dorsal margin of eye, ventral margin directed below ventral margin of eye, well-separated from eye. Eyes moderately large, vaulted, in dorsal view hardly prominent from outline of head; in lateral view placed at middle of head height, lacking longitudinal striae behind.

Antennae slender, with moderately long scapes, 1.5–1.6 × as long as funicles, exceeding anterior margin of pronotum, distinctly curved before midlength, in anterior half gradually enlarged, at apex 0.7 × as wide as clubs. Funicles 5-segmented; segments 1 and 2 slender, conical, segment 1 1.3 × as long as wide and 0.7–0.8 × as long as segment 2, segment 2 1.9–2.1 × as long as wide; segments 3–5 isodiametric, slightly gradually enlarged apicad; clubs elongate oval, 1.8–1.9 × as long as wide.

Pronotum ( Fig. 3 ) moderately slender, 1.06–1.12 × as wide as long, widest at midlength, with distinctly rounded sides, more tapered anteriad than posteriad, with anterior margin distinctly narrower than posterior. Disc granulate, granules completely concealed by encrustation. In lateral view pronotum somewhat vaulted, anterior margin strongly obliquely directed back beneath and towards coxae.

Scutellum not visible.

Elytra ( Fig. 4 ) oval, 1.27–1.31 × as long as wide, widest at midlength, with regularly rounded sides. Striae conspicuously coarsely punctured, not impressed between the punctures, distinctly wider than interstriae, separation of punctures shorter than their diameters. Interstriae slightly vaulted, somewhat smooth. Elytra in lateral view vaulted.

Femora of all legs edentate. Protibiae moderately slender, 5.78–5.95 × as long as wide at midlength, at apical quarter distinctly curved, on inner margin with mesal edge distinctly doubly sinuate, apex obliquely subtruncate, with fringe of dense, fine, yellowish setae, shorter in mesal than in lateral part, with long, slender yellowish mucro. Tarsi short, segment 2 1.5–1.6 × as wide as long; segment 3 1.4 × as wide as long and 1.6–1.7 × as wide as segment 2; onychium 0.6–0.7 × as long as segment 3, strikingly widened apicad with very long, strongly divaricate claws, almost as long as onychium.

Abdominal ventrites 1.05–1.08 × as long as wide, sparsely roughly punctate; ventrite 2 at middle about as long as ventrite 1, distinctly longer than ventrites 3 and 4 combined; suture between ventrites 1 and 2 sinuate, others straight. Metaventral process about as wide as transverse diameter of metacoxa.

Male genitalia. Penis ( Fig. 19 ) long and slender, in ventral view parallel-sided, at apex regularly tapering with rounded sides, tip very small, apically rounded; in lateral view slender, regularly curved, evenly tapered apicad.

Female genitalia. Spermatheca ( Fig. 20 ) with very slender cornu tapering apicad, ramus and collum well differentiated; ramus short, wide, subtrapezoidal, collum distinctly longer than wide, tube-shaped, curved. Sternite VIII ( Fig. 21 ) with long, slender apodeme; plate short, oval, 1.4 × as long as wide, with fenestra slender, short, reaching middle of plate. Ovipositor long, slender, slightly enlarging basad, with long apical styli with clump of setae at apices of styli, scarce irregularly scattered setae in apical third of gonocoxites.

Etymology. Named after the Philippine Islands.

Bionomy. Unknown, material was collected by local collectors.

Differential diagnosis. This newly described species is distinguished by 5-segmented antennal funicles, but also by gonocoxites with scarcely scattered setae in the apical third and a very similar shape of the spermatheca, which is similar only to T. buruana (Heller, 1929) , known from Buru Island in the Moluccas. In the last key for that genus ( Borovec 2021), T. philippinense belongs to the point 1, with T. buruana . The two species are easily distinguished by the following set of characters:

T. philippinense: Smaller , 1.7–2.0 mm. Funicle segments 3–5 isodiametric. Pronotum slenderer, 1.06–1.12 × as wide as long. Elytra longer, 1.27–1.31 × as long as wide, in both sexes lacking subhumeral bumps. Onychium shorter than tarsal segment 3. Metaventral process narrow, about as wide as transverse diameter of metacoxa. Penis in ventral view apically rounded, in lateral view slender, evenly tapering apicad ( Fig. 19 ). Plate of female sternite VIII short, 1.4 × as long as wide, with fenestra short, reaching middle of plate ( Fig. 21 ).

T. buruana: Larger , 2.7–2.9 mm. Funicle segments 3–5 longer than wide. Pronotum wider, 1.27–1.30 × as wide as long. Elytra shorter, 1.05–1.18 × as long as wide, in males with distinct subhumeral bumps, prominent laterally. Onychium as long as tarsal segment 3. Metaventral process wide, distinctly wider than transverse diameter of metacoxa. Penis in ventral view with short concavity at tip, in lateral view wide, abruptly tapered at apex ( Fig. 24 ). Plate of female sternite VIII long, 1.9–2.0 × as long as wide, with fenestra long, reaching almost base of plate ( Fig. 26 ).

Figures

FIGURES 1–3. Dorsal habitus. 1. Trachyphloeosoma ales. 2. T. david. 3. T. philippinense. Not to scale.

FIGURES 4–26. Structural details. 4–8. Trachyphloeosoma ales. 4. Head and rostrum, dorsal view. 5. Head and rostrum, lateral view. 6. Penis, dorsal and lateral view. 7. Spermatheca. 8. Sternite VIII in female. 9–12. T. david. 9. Head and rostrum, dorsal view. 10. Head and rostrum, lateral view. 11. Spermatheca. 12. Sternite VIII in female. 13–16. T. advena. 13. Head and rostrum, dorsal view. 14. Head and rostrum, lateral view. 15. Spermatheca. 16. Sternite VIII in female. 17–21. T. philippinense. 17. Head and rostrum, dorsal view. 18. Head and rostrum, lateral view. 19. Penis, dorsal and lateral view. 20. Spermatheca. 21. Sternite VIII in female. 22–26. T. buruana. 22. Head and rostrum, dorsal view. 23. Head and rostrum, lateral view. 24. Penis, dorsal and lateral view. 25. Spermatheca. 26. Sternite VIII in female. Scale bars: 0.50 mm (4, 5, 8–10, 12–14, 16–18, 21–23, 26), and 0.25 mm (6, 7, 11, 15, 19, 20, 24, 25).