Berosus (Enoplurus) litvinchuki Prokin, 2018

Prokin, A. A., 2018, New species of the genus Berosus (Coleoptera: Hydrophilidae) from Central Asia and Transcaucasia, Far Eastern Entomologist 368, pp. 1-10 : 3-7

Berosus (Enoplurus) litvinchuki Prokin , sp. n.

Figs 1–11 , 16, 18, 19

MATERIAL. Holotype: ♂, South Tajikistan: Gorno-Badakhshan Autonomous

Oblast, Nizhgar, 37.005°N, 72.461°E, h= 2738 m, 19.VII 2013, leg. S. Litvinchuk.

Paratypes: Tajikistan: same label data as the holotype, 2♂, 6♀ . Uzbekistan:

Samarkand Province , vicinities of Samarkand city, 39°39'N, 66°57'E, [18]96, 6♂ ,

6♀, leg. A. Barshevsky; Chimboy (=Shimbay or Chimbai), N from Nukus,

42°56'N, 59°46'E, 18.IV [1]875, 1♂, leg. Dorandt. Kazakhstan: Kyzylorda Province ,

Zhulek (=Dzhulek), 44°17'21"N, 66°25'53"E, Orenburg-Tashkent railway, Syr

Darya River, end of VII – beginning of VIII [19]10, 1♂, leg. Kozhanchikov.

Azerbaijan: Dzhalilabad Province, Geok Tapa (=Gӧytәpә in Dzhalilabad vicinities),

39°11'17"N, 48°40'46"E, on light of electric-arc lamp, 28. VI [19]01, 3♂, 2♀, leg. R .

Shmidt (collection of A. Jakovleff).

view; 3 – female, dorsal view; 4 – the same, ventral view.

ADDITIONAL MATERIAL EXAMINED (the females probably belonging to the new species): Tajikistan: Khatlon Province, Bobo-Safid, vicinities of Farkhor

(=Parkhar), Panj River , 37°30'N, 69°24'E, 29.VII [1]934, 1♀, leg. Luppova.

Kazakhstan: Aktobe Province, "Bolshiye Barsuki" steppe (sands in Kyrgyz steppe,

N Aral Sea), vicinities of Shalkar (=Chelkar), 47°50'N, 59°37'E, 19. VI [19]07, 1♀ ,

leg. V. Androsov; East Kazakhstan Province, Zaisan city, 47°28'N, 84°52'E, 23. VI

1965, 1♀, leg. I. Sukacheva.

same, female; 7 – microsculpture of female elytra.

general view; 10, 11 – details of the apex. Scale bar for 8, 9 = 1 mm; 10, 11 = 0.2 mm.

DESCRIPTION. Habitus ( Figs. 1–4 ). Body oval, length 3.9–5.4 (average 4.75)

mm. Head yellow, shiny, with a pair of black longitudinal spots from base along stem of Y-suture; punctuation consisting of rounded punctures, distance between punctures approximately equal to their diameter, punctures more aggregate near internal margin of eye. Central part of clypeus usually with obsolete punctation.

Labrum yellow, not shiny because of dense punctation, punctures smaller than on head. Submentum trapezoid, shiny with rare small punctures. Pronotum yellow,

shiny, with a pair of vaguely defined dark spots anteromesally, with punctation at most weakly darkened in range of dark pattern; punctation dense, distance between punctures more than twice bigger than their diameter; lateral margin of pronotum with narrow bead. Scutellum elongate triangular, sometimes concave. Elytra yellow, shiny, with blackened, narrow, well impressed striae and interval intervals, in females weakly shagreened, as seen on SEM by zigzag grooves ( Fig. 7 ) and bearing rare setae on posterior half; brownish spots consisting of isolated punctures of irregular

– B. fisheri Schödl, 1993 ; 12, 13 – general view; 14, 15 – details of the apex. Scale bar for

14, 15 = 0.2 mm.

shape present in humeral area, along suture in anterior third and behind the midlength,

and along the lateral margin. Elytral apices divergent, with rounded internal apex and small apical teeth of the same shape in both sexes ( Figs. 5, 6 ). Abdominal ventrites 1–4 with sharp teeth on the outer margin, first without median keel, fifth without emargination, entire semicircular ( Figs. 8–11 ). Aedeagus small, length 1.4–

2.1 mm (1.64 average), with the length of phallobase (0.5–1.0 mm, average 0.7)

nearly equal or slightly shorter to paramers (0.8–1.1 mm, average 0.9); phallobase weakly curved, almost straight, is at an obtuse angle to the parameres in lateral view; pamaremeres wide (spatulate) at apex; median lobe slightly bent at apically in lateral view ( Figs. 16, 18, 19 ).

VARIATION. Form of dark spots of the pronotum and black spots of the head, as well as coloration of the elytra are variable. Old specimens are darkener than newly collected; their general color is brown, not yellow.

DIFFERENTIAL DIAGNOSIS. New species is similar to Berosus spinosus but differs from latter in the relatively smaller size of the body and aedeagus, not so robust phallobase and more weakly shagreened female elytra. New species is distin-

guishable from B. fisheri by the male ventrite 5 without toothlets at the posterior margin The new species is recognizable from B. asiaticus by entire last abdominal ventrite, the parameres more expanded at apex, and by usually bigger aedeagus

(also in relation to the body length) and phallobase usually equal or slightly shorter to parameres.

DISTRIBUTION. Tajikistan (Nizhgar,?Bobo-Safid); Uzbekistan (Samarkand,

Chimboy); Kazakhstan (Zhulek,?Zaysan,?Shalkar); Azerbaijan (Geok Tapa near

Dzhalilabad). Records of B. asiaticus Kuwert, 1888 from China (Xinjiang) and

Asian Turkey (Fikáček et al., 2015) probably also belongs to this species.

BIOLOGY. Not known, because most part of specimens was collected at light,

others have no habitat information on the labels.

ETYMOLOGY. The new species is dedicated to the collector of the holotype,

Spartak Litvinchuk.

Figures

Figs. 1–4. Habitus of Berosus litvinchuki sp. n. 1 – male, dorsal view; 2 – the same, ventral

Figs. 5–7. Berosus litvinchuki sp. n. 5 – male ventrites IV, V and apex of elytra; 6 – the

Figs. 8–11. Ventrite V of Berosus litvinchuki sp. n. 8, 10 – male; 9, 11 – female; 8, 9 –

Figs. 16–22. Male genitalia of Berosus spp. 16, 19, 21 – B. litvinchuki sp. n.; 17 – B.