Barclayanthus micros Borovec & Skuhrovec, 2019

Borovec, Roman & Skuhrovec, Jiří, 2019, Two new genera of Trachyphloeini with a key to the genera of small terricolous South African Trachyphloeini and Embrithini (Coleoptera: Curculionidae: Entiminae), Zootaxa 4695 (5), pp. 451-476 : 454-457

Barclayanthus micros Borovec & Skuhrovec , sp. nov.

( Figs 1 A–F, 2A–E)

http://zoobank.org/ urn:lsid:zoobank.org:act:5EB19AB0-34DD-4F67-9215-93BCBB42CF34

Type locality. Mossel Bay ( South Africa, Western Cape) .

Type material. Holotype. 1 spec., ‘[ South Africa, Western Cape] CAPE PROVINCE: Mossel Bay , 11.XII.1938, R. E. Turner [lgt.], B.M. 1939-56.’ ( BMNH) . Paratypes. 16 spec., the same data as holotype ; 3 ♂ ♀, ditto, but ‘ 16. XII.1938 ’; 4 ♂ ♀ ditto, but ‘ 7.XII.1938 ’; 1 spec. ditto, but ‘ 14.XII.1938 ’; 1 spec. ditto, but ‘ 13.XII.1938 ’; 1 spec. ditto, but ‘ x.1933 ’ ( BMNH, RBSC, TMSA) .

Description ( Figs 1 A–F, 2A–E). Body length 1.22–1.59 mm, holotype 1.38 mm. Appressed scales on elytra rounded with 8–10 fine and short fringes on circumference, 3–4 across one elytral interstria, leaving only very short spaces between them. Appressed scales on pronotum, head, scapes and legs except tarsi identical as elytral ones, rostrum with similar, but irregularly angular appressed scales. Semiappressed setae on elytra oval, shorter than diameter of one appressed scale, hardly visible in lateral view, forming one regular, dense row on each interval, distance between two setae about triple of its length. Semiappressed setae on pronotum and head with rostrum distinctly longer than elytral ones, slightly longer than diameter of one appressed scale, moderately densely irregularly scattered. Semiappressed setae on scapes, femora and tibiae about as long as elytral ones but slenderer, sparsely scattered, hardly visible, not protruding beyond the outline. Funicles with hardly visible, short, semiappressed piliform setae.

Rostrum ( Fig. 2B ) 1.86–2.00 × as wide as long, at base 1.18–1.19 × as wide as at apex.

Scapes ( Fig. 2A ) 2.52–2.59 × as long as wide, 1.11–1.15 × as long as funicles, basal half abruptly dilated, than subparallel-sided, at apex 1.48–1.56 × as wide as clubs. Funicle segment 1 enlarged, 1.5 × as long as wide and twice as long as segment 2, which is 1.5 × as long as wide; segment 3 isodiametric; segment 4 1.1 × as wide as long; segment 5 1.2 × as wide as long; segment 6 1.4–1.5 × as wide as long; clubs 1.6–1.7 × as long as wide.

Pronotum 1.63–1.79 × as wide as long ( Fig. 2A ), with distinctly rounded sides; in lateral view weakly vaulted, behind anterior border distinctly flattened. When scraped, disc finely and densely punctured, matt.

Elytra 1.10–1.14 × as long as wide ( Fig. 2A ), only slightly wider than pronotum, disc in lateral view vaulted. When scraped, disc finely and densely punctured, matt. Tergite VIII in males apically truncate.

Protibiae ( Fig. 2E ) robust, 3.67–3.93 × as long as wide, on inner side weakly sinuate, from midlength distinctly tapered anteriad. Tarsal segment 2 isodiametric; segment 3 1.1 × as wide as long and 1.1–1.2 × as wide as segment 2; onychium 1.3–1.4 × as long as segment 3.

Male genitalia. Penis ( Fig. 2D ) subparallel-sided or with slightly rounded sides, then widest at midlength, apical part distinctly tapered and elongated, with long, slender, parallel-sided tip; in lateral view irregularly curved, widest at midlength, tapered apicad and basad, tip very slender and sharp, curved inside.

Female genitalia. Gonocoxites were not examined. Spermatheca ( Fig. 1F ) with long and slender, regularly curved cornu, long and slender corpus, long and slender, subrectangle ramus and small, bump-shaped nodulus.

Derivation of name. The very small body size suggested its name, meaning „small, delicate, minute“ in Latin, in reference to being the smallest known South African species of Trachyphloeini .

Biology. Unknown.

Distribution. South Africa, Western Cape.

Differential diagnosis. Barclayanthus micros Borovec & Skuhrovec , sp. nov. is easily separated from B. cooteri Borovec & Skuhrovec , sp. nov. by elytra with all intervals equally flat, pronotum wide, only slightly narrower than elytra and penis with apical part distinctly elongated to long, slender tip.

Figures

FIGURE 1. Barclayanthus micros sp. nov. A—habitus, ventral view, male; B—rostrum without scales, dorsal view, male; C—rostrum without scales, lateral view, male; D—head, ventral view, male; E—ventrites, male; F—spermatheca. Scale bar: 0.25 mm (F).

FIGURE 2. Barclayanthus micros sp. nov. A—habitus, dorsal view, male; B—rostrum, dorsal view, male; C—rostrum, lateral view, male; D—aedeagus; E—protibia, male. Scale bars: 1 mm (A), 0.5 mm (D).