Pseudobasidissus barclayi Trýzna & Baňař, 2014

Trýzna, Miloš & Baňař, Petr, 2014, Description of a new genus and species, Pseudobasidissus barclayi (Coleoptera: Anthribidae), from east Madagascar, Zootaxa 3869 (2), pp. 180-188 : 182-187

Pseudobasidissus barclayi Trýzna & Baňař sp. nov.

( Figs. 1–8 , 10, 12–16 , 18–19 )

Type locality. North-east Madagascar, Antsiranana province, Marojejy Nat. Park.

Type material. Holotype, male: NE MADAGASCAR, ANTSIRANANA PROVINCE: ‘ Madagascar NE / Marojejy NP, 1.–4.xi.2005 / J. Šťastný lgt.’ ( BSNPC). Allotype: CE MADAGASCAR, FIANARANTSOA PROVINCE: ‘CE Madagascar / Ranomafana Nat. Park / S 21°15´48.6´´, / E 047°25´23.2´´ // near main entrance / 984 m a.s.l. / 26.–31.i.2007 / M. Trýzna leg.’ ( MTDC). Paratype male: same locality as holotype ( MTDC). Red label [p] HOLOTYPE / ALLOTYPE / PARATYPE / Pseudobasidissus barclayi / gen. nov. et sp. nov. / M. Trýzna & P. Baňař det., 2014.

Description. Male holotype, (female allotype). Measurements (in mm): Total body length—12.25 (9.64). Head: total length—2.35 (1.73); length of rostrum—1.29 (0.91); maximum width of rostrum—1.78 (1.56); length of eye—0.91 (0.71); maximum width across eyes—2.40 (2.02); minimum distance between eyes—1.04 (0.91). Antenna: length of segments: II—0.33 (0.24), III—0.44 (0.27), IV—0.44 (0.27), V—0.56 (0.36), VI—0.49 (0.22), VII—0.51 (0.18), VIII—0.44 (0.22), IX—0.58 (0.27), X—0.49 (0.29), XI—0.64 (0.49). Pronotum: maximum length—3.56 (2.73); width at carina—5.00 (4.08); minimum width—2.15 (1.78). Elytra: maximum length—6.75 (5.54); maximum width—5.18 (4.37).

Colouration of the cuticle generally brown, pro-, meso-, metasternum and ventrites dark brown to black, covered with dense yellowish hairs. Proximal half of femora dark brown to black, rest of femora, tibiae and tarsi light brown. Antennae light brown to yellowish.

Vestiture. Head predominantly with light yellowish setae, mixed with darker, brown setae on distal part of rostrum, frons and around eyes. Pronotum with characteristic transverse stripes of light yellow and brown setae ( Fig. 1, 4 ). Proximal part of pronotum with transverse dark triangular patch covered by brown and whitish mixed pubescence, distal part with dark transverse stripe. Disc of pronotum with yellowish pubescence formed into a single central tuft of erect yellowish setae. Elytra covered with light brownish, dark brownish and yellowish longitudinal stripes of setae ( Fig. 1, 4 ). Each elytron with nine tufts of setae; two dark brown to black subbasal tufts, one smaller brown-black antemedian tuft on the fourth elytral interval, one bigger yellowish postmedian tuft on the second elytral interval and five dark brown tufts in the preapical part. Scutellum with yellowish setae. Antennae with yellowish pubescence, antennomeres V–VIII covered by longer conspicuous appressed setae in both sexes, remaining antennomeres and primarily antennomeres IX–XI only with very short, soft, dense setae in both sexes. All legs covered with dense, fine yellowish setae, all femora with indistinct light distal part, with crooked interrupted slender white stripe on the distal quarter. Tibiae unicolorous with indistinct white stripe on proximal third. All tarsomeres with yellowish setae. Lateral parts of venter of thorax and abdominal sternites with dense yellowish pubescence mixed with brown setae. Pygidium covered with dense yellow appressed setae, margins of pygidium with sparse dark brown setae.

Structure. Head relatively short, rostrum broad ( Fig. 2 ), depressed in the middle, with distinct longitudinal carina reaching between eyes in both sexes. Ratio of rostrum length to maximum width 0.72 in male, 0.58 in female. Eyes slightly emarginate anteriorly, dorsal ocular index 1.52 in male, 1.64 in female. Ratio of maximum width across eyes to maximum width of rostrum 1.35 in male, 1.29 in female. Shape of individual antennomeres of male shown in Fig. 3 . Pronotum slightly transverse, ratio of its length to width at carina 0.71 in male, 0.67 in female, gradually narrowed anteriorly, widest at dorsal transverse carina. Dorsal transverse carina bisinuate with wide, deep arch in the middle. Lateral carina of pronotum very short, deeply emarginate in dorsal view, angulate, in contact with dorsal transverse carina lobe-like. Elytra broadly suboval to rectangular ( Fig. 1 ), narrowed even in distal fifth of their length, ratio of the maximum length to maximum width of elytra 1.30 in male, 1.27 in female. Abdomen shorter than broad. Pygidium robust, almost subquadrate in male ( Fig. 15 ), wider than long in female ( Fig. 16 ), slightly narrowing posteriorly, ratio of its maximum length to maximum width 1.02 in male, 0.88 in female.

Male genitalia and associated structures. Segment 8 ( Fig. 12 ) robust and wide, tergite 8 roughly sclerotized, sternite 8 forming from two semicircular sclerites, separted from each other. Sternite 9 thin, with long basal arms. Aedeagus robust, tectum and pedon wide, apodemes thick, only slightly curved. Tegmen ( Fig. 13 ) robust, its apex densely covered with long setae. Internal sac of aedeagus finely serrated on all faces, consisting of well differentiated ventral and dorsal lobe ( Figs. 7–8 ). Dorsal lobe beak-shaped, roughly sclerotized.

Female genitalia. Hemisternites robust ( Fig. 14 ), lateral and median rods long, median rod reaching to two fifths of length of lateral rod. Toothed plates with five teeth each, stylus present. Bursa copulatrix ( Figs. 18–19 ) strongly widened basally, almost bilobate, with single sclerotized plate in its central part. Spermatheca as figured ( Fig. 18 ), spermathecal gland thin and long.

Sexual dimorphism. Male antennae moderately long, reaching approximately to posterior margin of pronotum (or extending slightly beyond this margin), scape more robust.

Etymology. Patronym, dedicated to our friend and colleague Maxwell V. L. Barclay (Natural History Museum, London).

Distribution. Two males (holotype and paratype) were collected in NE Madagascar, Antsiranana province, Marojejy National Park, one female (allotype) in CE Madagascar, Fianarantsoa province, Ranomafana National Park. Both national parks are significant areas of dense primary rain forest.

Figures

FIGURES 1 – 6. Pseudobasidissus barclayi gen. et sp. nov., male holotype; 1, dorsal habitus; 2, head, dorsal view; 3, right antenna, dorsal view; 4, lateral habitus; 5, abdomen, lateral view; 6, abdomen, ventral view. Scale bars in mm.

FIGURES 7 – 9. 7 – 8, Pseudobasidissus barclayi gen. et sp. nov., male holotype; 9, Basidissus cristatus Fairmaire, 1897, male; 7, aedeagus, lateral view; 8, internal sac of aedeagus, lateral view; 9, aedeagus, lateral view. Scale bars in mm.

FIGURES 10 – 17. 10, 12 – 13, 15, Pseudobasidissus barclayi gen. et sp. nov., male holotype; 11, 17, Basidissus cristatus Fairmaire, 1897, male; 14, 16, Pseudobasidissus barclayi gen. et sp. nov., female allotype; 10 – 11, body of aedeagus, ventral view; 12, segment 8 and sternite 9, ventral view; 13, tegmen, lateral view; 14, hemisternites, ventral view; 15 – 17, pygidium, dorsal view. Abbreviations: os = ostium; st 8 = sternite 8; st 9 = sternite 9; tg 8 = tergite 8. Scale bars in mm.

FIGURES 18 – 21. 18 – 19, Pseudobasidissus barclayi gen. et sp. nov., female allotype; 20 – 21, Basidissus cristatus Fairmaire, 1897, female; 18, 20, bursa copulatrix and spermatheca, ventral view; 19, 21, bursa copulatrix, lateral view. Abbreviations: mov = median oviduct; scpl = sclerotized plate; sp = spermatheca; spd = spermathecal duct; spg = spermathecal gland. Scale bars in mm.