Brachysomus (Brachysomus) mihoki Penecke, 1914

Yunakov, Nikolai, 2022, A review of the genus Brachysomus Schoenherr (Coleoptera: Curculionidae: Entiminae), Zootaxa 5193 (1), pp. 1-165 : 47-48

Brachysomus (Brachysomus) mihoki Penecke, 1914

Figs. 9 , 22–24 , 95–99 , 202 , 235B

Brachysomus mihoki Penecke, 1914: 36 . Type locality: Hungary, Huszárok; Košťál 1991b: 79.

Redescription. Measurements: Body length 2.55–4.50 mm, width 1.50–2.50 mm. Vestiture: Head and body densely covered with recumbent, piliform, dark and light scales, and slender, acute, dark-brown, erect setae. Apical 1/3 of epifrons almost bare, basal 1/3 densely covered with piliform scales and slender, erect setae. Dark-brown recumbent scales forming spotted pattern along elytra. Setae longer than width of elytral interstriae. Legs evenly and densely covered with light scales. Ventral side of body evenly and sparsely covered with pale hairs and piliform scales. Colouration: Body, legs and antennae brown.

Head: Rostrum elongate, parallel-sided (RL/RW = 1.28), outline in line with temples. Antennal sockets partly visible in dorslal view, hidden by lateral margins of epifrons. Pterygia weakly projecting from outline of rostrum. Antennal scrobes sharply developed and deep, directed to ventral margin of eye, reaching ventral side of rostrum. Epistome flat, delimited from epifrons by thin V-shaped carina.Epifrons parallel-sided, weakly convex longitudinally, without carina, with deep median longitudinal sulcus, densely punctate, separated from vertex by shallow, weakly visible depression. Vertex flat, finely longitudinally punctate, as wide as epifrons at level of antennal insertion. Eyes oval (VW/ELD = 1.40–1.75), weakly convex, highest at middle, dorsal margin situated near level of vertex in lateral view. Antennae: Scape gently curved, strongly widened along distal 1/3; funicular antennomeres: 1st (L/W=2.2) and 2nd (L/W=1.7) elongate, 3rd–7th moniliform; club widely spindle-shaped.

Thorax: Pronotum transverse [PL/PW = male: 0.71–0.72 (0.72); female: 0.72–0.76 (0.74)], widest at middle, strongly evenly convex at disc and sides, strongly constricted anteriorly and gently posteriorly, densely, shallowly punctate, spaces between punctures 0.5x as wide as diameter of puncture, disc without lateral depressions. Elytra: broadly-oval to globose, at disc strongly convex. Interstriae flat, glabrous, 2x wider than striae. Punctures well separated. Spaces between punctures very weakly concave, as long as diameter of puncture. Legs: Fore tibiae straight, with apical external angle, in males not protruding, in females weakly spade-shaped. Hind tibiae with sparse grooming brush, weakly mucronate. Fifth fore tarsomere extending beyond apical lobes of 3rd by 0.70 length of the lobes.

Abdomen: First ventrite with posterior margin weakly sinuate. Male 5th ventrite flat, without depression, with apical margin truncate. Male abdominal sternite IX membranous. Pygidium coarsely punctate. Male genitalia: Aedeagus heavily sclerotized through entire length; median lobe 0.6x as long as apodemes, parallel-sided, apex sharply attenute. Endophallus densely covered with microscopic spiculae. Endophallic sclerite large, needle-shaped, with lobe at base. Parameres connate at basal half. Spermatheca with short collum and ramus.

Diagnosis. Brachysomus mihoki is quite morphologically distinct from other known species and can be easily distinguished by its large body size (length 2.55–4.25 mm), dense piliform scales forming distinct spots on elytra, dark, erect, very long setae at the elytral interstriae, epistome in male bearing a thorn-shaped process in the lateroapical angles. In general appearance, B. mihoki is similar to Mylacomorphus macedonicus F. Solari, 1948 ( Figs. 172–176 ).

Distribution. Endemic to Bakony Hills (Hungary).

Bionomics. Unknown.

Type material. Lectotype, ♂ (MTD), ‘Ung. Veszprém, Huszárok’, ‘ Brachysomus mihoki Pen., Penecke det.’, ‘Cotypus [red, handwritten]’, ‘Lectotypus, Brachysomus mihoki Pen. Košťál design. 1987 [red, handwritten]’. Paralectotypes 2♂, 1♀ (MTD), labeled as lectotype.

Additional material examined. HUNGARY: Veszprém, Bakony Mountain Range: 1♂, 1♀, ‘Hungaria, Veszprém m., Magas-Bakony, Kőris-hegy, 11.vi.1995, A. Podlussány’ (HNHM); 1♂, ‘Géza-háza, Ördög-árok, Bakony hegység, 11.v.1983, A. Podlussány’ (HNHM); 1♀, ‘Csesznek, Ördög-árok, Bakony hegység, 11.v.1983, A. Podlussány’ (HNHM); 1♀, ‘Bakony, Dr. Lanci’ (HNHM); 1♀, ‘Bakonyb[él]’ (HNHM); 1♂, ‘Zircz, Hungaria, leg. Kaszab’ (HNHM); 2♀, ‘Szücs [= Bakonyszücs]’ (HNHM).

Doubtfulmaterial. Pest: 1♂, ‘Budapest, Hungaria, leg. Kaszab’ (HNHM).

Figures

FIGURE 202. Brachysomus mihoki: A: aedeagus; B: endophallic sclerite; C: tegmen; D: spermatheca; E: sternite IX and hemisternite VIII; F: head of male; G: antenna.

FIGURE 235. Occurrence map of Brachysomus: A: B. echinatus; B: Brachysomus s. str.

FIGURES 1–11. Brachysomus. General morphology of the head. 1: B. echinatus, head dorsal view. 2: B. echinatus, head ventral view. 3: B. kubanensis, head ventral view (labium ablated). 4: B. echinatus, head lateral view. 5: B. echinatus, labium: pr—prementum, pm—postmentum. 6, B. echinatus, left mandible, anterior surface 7: B. echinatus, left mandible, posterior surface 8: subgenal angle. 9: B. mihoki, head dorsal view. 10: B. echinatus, left mandible with deciduous process, anterior surface. 10A: B. echinatus, right maxilla anterior surface. 11: B. echinatus, tentorium dorsal view. Abbreviations: af—antennal fossa, bc—buccal cavity, cd—cardo, cly—clypeus, cs—cervical suture, e—eye, ef—epifrons, eld—eye longitudinal diameter, ep—epistome, ga—galea, gat—galeal teeth, gs—gular suture, hls—hypostomal labial suture, hs—hypostoma, la—lacinia, lat—lacinial teeth, mpm1-3—maxillary palpomere 1–3, oco—occipital opening, pac—paracoila (maxillary fossa), paep— paraepistome, pg—palpiger, pm—postmentum, poep—postepistome, poc—postcoila, prc—precoila, ptp—posterior tentorial pits, ptr—prerygium, rl—rostral length, rw—rostrum width, st—stipes. vw—vertex width, php—pharyngeal process, te1— tendon of musculus abductor mandibulae, te2—tendon of musculus adductor mandibulae, tem—temple.

FIGURES 22–24. Brachysomus mihoki. General morphology. 22: aedeagus. 23: tegmen. 24: female genitalia. Abbreviations: tg—tegmen, es—endophallic sclerite, dej—ductus ejaculatorius (flagellum), ap—apodemes of median lobe, bc—bursa cupulatrix, co—collum, cxt—coxite, cp—corpus, ds—ductus spermaticus, pm—paramera, ml—median lobe, mn—manubrium (tegmenal apodeme), sf—spiculate fields, st8—sternite 8, st8ap—apodeme of sternite 8 tr—tegmenal ring, vag—vagina, vm— ventral membranes.

FIGURES 95–99. Brachysomus mihoki, details:. 95: main view, male. 96: main view, female. 97: head, dorsal view. 98: head, lateral view. 99: head, ventral view, lateroapical process showed by arrows.

FIGURES 164–172. Brachysomus, details: 164: B. deceptorius, male. 165: simplex, female. 166: B. longipterus, male. 167: idem, female. 168: B. deceptorius, male head dorsal view. 169: simplex female. 170: B. deceptorius, male head lateral view. 171: B. longipterus, male head dorsal view.

FIGURES 172–179. Mylacomorphus and Nanomias, details: 172: Mylacomorphus macedonicus, male, HT. 173: idem, head and pronotum, dorsal view. 174: idem, rostrum dorsal view. 175: idem, head and pronotum, lateral view. 176: idem, left antenna. 177: Nanomias terricola. 178: idem, head and pronotum, dorsal view. 179: idem, lateral view.