Hylotribus plaumanni Queiroz & Mermudes, 2014

Roza, André Silva & Mermudes, José Ricardo Miras, 2019, Three new species of Hylotribus Jekel, 1860 from Brazil, with new records and discussion of species relationships and wing variation within the genus (Coleoptera Anthribidae), Zootaxa 4711 (1), pp. 140-156 : 149-153

Hylotribus plaumanni Queiroz & Mermudes, 2014

( Figs 16–29 )

Hylotribus plaumanni Queiroz & Mermudes, 2014: 247 .

This species was recently described and illustrated by Queiroz & Mermudes (2014) based on females. Here, the description of the ventrites and male terminalia are added. Besides this, the variability of the vestiture and morphology is also commented on, including new information on wing variation within the species; we observe wing development ranging from macropterous to apterous among specimens we examined ( Figs 28–29 ).

Male. Pygidium ( Fig. 22 ) slightly wider than long, and weakly sinuous at apical margin. Ventrite V ( Fig. 21 ) at least 1.5 times longer than IV, impressed on disc; apical margin slightly rounded. Terminalia ( Figs 23–27 ): Tergite VIII ( Fig. 23 ) largely membranous at middle; sides subparallel and slightly constricted at middle, apical margin slightly sinuous; sternite VIII ( Fig. 23 ) strongly transverse and membranous, with apical lobes strongly pigmented and pronounced. Sternite IX ( Fig. 23 ) with apodeme almost 2.5x as long as arms. Tegmen ( Figs 24–25 ) with apodeme as long as sclerotized ring, this with angles of pre-apical flange individualized (not bilobate); apex of parameres rounded. Penis ( Figs 26–27 ) elongate, strongly curved in apical fifth; body almost 2.5x as long as apodemes; with sclerotized bridge between apodemes; tectum two times longer than wide, strongly acuminate in apical half; pedon strongly curved, with apodemes sinuous. Internal sac ( Fig. 27 ) slightly longer than apodemes, distinctly spiculate in proximal half, lacking sclerotized pieces.

Previously known distribution. Type locality: Seara (300–600 m), in Santa Catarina State ( Queiroz & Mermudes 2014) .

Updated distribution. Minas Gerais. Itamonte, in the Parque Nacional de Itatiaia , at around 2,100 m elevation. Rio de Janeiro. Teresópolis, on the Parque Nacional de Serra dos Órgãos , from 1,799 to 2,140 m . Santa Catarina. Seara.

Seasonality. This species seems to occur between September and May, during the Southern Hemisphere spring, summer and autumn.

Variability. H. plaumanni was described as having a V-shaped yellowish stripe with obtuse angle on the frons, and a prominent longitudinal carina on the rostrum. These characters were also used in the key to species of Hylotribus , in order to separate H. plaumanni from H. frontispeltastes and H. involucer ( Queiroz & Mermudes 2014) . In the specimens of H. plaumanni we observed that the V-shaped stripe was highly variable ( Figs 18–20 ). It could either form an acute angle with the longitudinal carina ( Figs 18–19 ), forming a diamond with another inverted Vshaped stripe on the vertex ( Fig. 18 ), or instead be smudged ( Fig. 19 ) and not forming a V-shaped pattern ( Fig. 20 ). The longitudinal carina on the rostrum is always distinct, but a pair of lateral carinae can be slightly elevated or vestigial.

Wing variation within the species ranges from macropterous to apterous ( Figs 28–29 ), and was verified in at least three specimens with the elytra partially elevated (allowing examination of wings):

1. The paratype of H. plaumanni (apterous) from Seara, locality with altitude variation of 300–600 m in Santa Catarina, South of Brazil;

2. A specimen compared with the type-series, from Teresópolis, Parque Nacional da Serra dos Órgãos, Trilha da Pedra do Sino, PRE-PVE Pt. 5, 22° 27’ 16.7” S, 43° 01’ 13.7” W, 1,961 m (macropterous, Fig 28 ), Southeastern Brazil (Rio de Janeiro).

3. A third specimen, also compared with the type-series, from Teresópolis, Parque Nacional da Serra dos Órgãos, PVE Pt. 14B, 22° 27’ 37” S, 43° 01’ 37.4” W, 2125m (micropterous, Fig. 29 ), Southeastern Brazil (Rio de Janeiro).

Material examined. BRAZIL. Minas Gerais. Itamonte. Parque Nacional de Itatiaia. Setor Brejo da Lapa, Brejo da Lapa , PNI-M1A, 22° 21’ 32.4” S, 44° 44’ 14.0” W, 2142 m, 1 male, 3.XII.2015 - 15.I.2016 ; PNI-M1B, 22° 21’ 34.1” S, 44° 44’ 9.4” W, 2162 m, 1 female, 3.XII.2015 - 15.I.2016, Monné col. ( MNRJ) . Rio de Janeiro. Teresópolis. Parque Nacional da Serra dos Órgãos. Trilha da Pedra do Sino. PRE-PVE Pt. 5, 22° 27’ 16.7” S, 43° 01’ 13.7” W, 1961 m, 1 female, 04.I.2014, R. Monteiro col. ( DZRJ) ; Teresópolis. Parque Nacional da Serra dos Órgãos. PVE Pt. 12B, 22° 27’ 17,4” S, 43° 00’ 57,3” W, 1799 m, 1 male, IX.2015 ; PVE Pt. 13B, 22° 27’ 14.3” S, 43° 01’ 13.2” W, 1935 m, 1 female, V.2015 ; PVE Pt. 14B, 22° 27’ 37” S, 43° 01’ 37.4” W, 2125 m, 1 female, III.2015 ; PVE Pt. 14A, 22° 27’ 37.3” S, 43° 01’ 39.3” W, 2127 m, 1 female, X.2015 ; PVE Pt. 15B, 22° 27’ 37,4” S, 43° 01’ 42,9” W, 2140 m, 1 male, XII.2014, R. Monteiro col. ( DZRJ) .

Figures

FIGURES 16–20. Hylotribus plaumanni, Teresópolis-RJ. 16. Habitus, dorsal; 17. Habitus, lateral; 18–20. Head and rostrum, frontal.

FIGURES 21–27. Hylotribus plaumanni, male, Teresópolis-RJ. 21. Abdomen, ventral; 22. Pygidium, dorsal; 23. Tergite VIII, ventral, and sternite VIII and sternite IX, ventral; 24. Tegmen, dorsal; 25. Tegmen, lateral; 26. Aedeagus, dorsal; 27. Aedeagus, lateral.

FIGURES 28–29. Hylotribus plaumanni, Teresópolis-RJ. 28. Macropterous specimen; 28. Micropterous specimen.