Berosus andreazzei, Santana & Benetti & Clarkson & Pes, 2019

Santana, Larissa, Benetti, Cesar João, Clarkson, Bruno & Pes, Ana Maria, 2019, On the genus Berosus Leach (Coleoptera: Hydrophilidae) in the State of Roraima Brazil: description of three new species and new records, Zootaxa 4700 (4), pp. 445-463 : 448-450

Berosus andreazzei sp. n.

( Figs. 4 a–h)

Type locality. BRAZIL: Roraima State, Boa Vista County (municipality), pond near the “ Estrada do Contorno ” road (02°47’15.4’’N / 60°46’37.3’’W) ( Fig. 3 ) .

Type material. Holotype male. BRAZIL: Roraima State: Boa Vista County (02°47’15.4’’N / 60°46’37.3’’W), 01.vi.2015, leg. K. Dias, C. Benetti. Condition of holotype: stored in 80% ethanol with the dissected male genitalia stored in microvials with glycerin, deposited at INPA . Paratypes (62). BRAZIL: Roraima State: Same data as holotype, except [1 female stored in 80% ethanol, deposited at INPA] ; same data as holotype, except (02°47’29.8’’N / 60°47’08.4’’W) [1 male and 1 female stored in 80% ethanol, deposited at MZSP] ; same data as holotype, except (02°46’23.8’’N / 60°45’41.8’’W) [4 females stored in 80% ethanol, deposited at INPA] ; same data as holotype, except (02°49’02.7’’N / 60°48’18.3’’W), 02.vi.2015 [1 male and 2 females stored in 80% ethanol, deposited at SEMC] ; same data as holotype, except (02°52’06.4’’N / 60°51’57.9’’W), 03.vi.2015 [1 male and 2 females stored in 80% ethanol, deposited at INPA] ; same data as holotype, except (02°54’36.5’’N / 60°57’30.9’’W), 03.vi.2015 [4 females stored in 80% ethanol, deposited at INPA] ; same data as holotype, except (02°53’03.5’’N / 60°52’45.5’’W), 03.vi.2015 [1 male and 1 female stored in 80% ethanol, deposited at INPA] ; same data as holotype, except (02°57’35.4’’N / 61°04’39.9’’W), 04.vi.2015 [3 females stored in 80% ethanol, deposited at INPA] ; same data as holotype, except (02°49’17.4’’N / 60°48’10.6’’W), 06.vi.2015 [2 females stored in 80% ethanol, deposited at INPA] ; Alto Alegre County (02°50’51.2’’N / 60°50’25.0’’W), 02.vi.2015 [2 females stored in 80% ethanol, deposited at INPA] ; Alto Alegre County (02°51’13.7’’N / 60°50’32.8’’W), 02.vi.2015 [3 males and 3 females stored in 80% ethanol, deposited at MNRJ] ; Alto Alegre County (02°59’48.7’’N / 61°07’48.7’’W), 05.vi.2015 [14 males and 10 females stored in 80% ethanol, deposited at DZUP] ; Alto Alegre County (02°59’39.8’’N / 61°06’46.2’’W), 05.vi.2015 [6 females stored in 80% ethanol, deposited at INPA] .

Diagnosis. Berosus andreazzei sp. n. can be distinguished from other Neotropical species of Berosus by the following combination of characteristics: small size (2.57–2.59 mm); clypeus yellow with small dark-brown area on the middle, frons yellow with dark-brown lateral area; pronotum yellow with small discal dark-brown spot; elytra with small dark-brown spots, without dorsal metallic luster, with small dark-brown spots ( Fig. 4a ); pronotum with fine round punctures ( Fig. 4a ); elytral striae well-impressed with round punctures ca. 2× larger than those on the pronotum ( Fig. 4a ); mesoventral process laminar with short curved anterior tooth, directed downwards and backwards with smooth margins ( Fig. 4d ); abdominal ventrites not crenulate along lateral and posterior margins; first ventrite medially carinate along its whole length; fifth ventrite with apical notch ca. one-quarter the total length, bearing two median short teeth ( Fig. 4e ).

Description. Size and form. Total length: 2.57–2.59 mm. Body short, nearly 2× longer than wide in dorsal view ( Fig. 4a ), moderately convex in lateral view ( Fig. 4b ).

Color. Labrum and clypeus yellow with small dark brown area on the middle, frons yellow with dark brown lateral area, without metallic luster ( Fig. 4a ); maxillary palpi yellow with apical palpomere dark brown at apex ( Figs. 4 a–c); pronotum yellow with small discal dark brown spot without metallic luster; scutellar shield yellow ( Fig. 4a ); elytra yellow with small dark brown spots ( Fig. 4a ); venter of thorax and abdomen dark brown ( Fig. 4c ); femora with pubescent portion darkened, glabrous portion yellow; tibiae and tarsus yellow ( Figs. 4 a–c).

Head. Clypeus and frons sparsely and finely punctate, punctures ca. 2× as large as ommatidia, round in shape ( Fig. 4a ). Frontal carina absent. Eyes slightly prominent ( Fig. 4a ). Maxillary palpi short, nearly half as long as width of the head, and thick ( Figs. 4 a–c).

Thorax. Posterior margin of pronotum as wide as basal margin of elytra, with fine, round, and moderately dense punctures, similar in size as those on head ( Fig. 4a ). Scutellar shield densely punctate with punctures similar in size to those on the elytra. Elytral striae well-impressed with round punctures ca. 2× larger than those on the pronotum; interstriae flat on elytral disc, ca. 2× as wide as striae, sparsely and finely punctate (punctures smaller than those on pronotum); humeral hump not prominent ( Fig. 4a ); elytral apices rounded ( Figs. 4 a–c); spine-like hairs absent ( Fig. 4a ). Mesoventral process laminar with short and curved anterior tooth, directed downwards and backwards, with smooth margins; posterior angle of the mesoventral process weakly raised in lateral view, not prominent ( Fig. 4d ). Metaventral process wide, carinate before median depression, posterolateral angles produced into rounded laminae, posterior angle not raised ( Fig. 4c ). Basal pubescence on two-thirds of mesofemora and three-quarters of metafemora, limit oblique ( Fig. 4c ). Protarsus of male with adhesive soles in tarsomeres 1–2, first tarsomere ca. 1.5× longer than second, fourth tarsomere elongate, almost as long as tarsomeres 1–3 combined ( Figs. 4a, c ). Claws weakly arched ( Figs. 4 a–c).

Abdomen. First ventrite medially carinate in its whole length, without lateral depressions; abdominal ventrites 2–4 without central carina or teeth-like projection, not crenulate along lateral and posterior margins; fifth ventrite with apical notch ca. one-quarter the total length, bearing two short median teeth ( Fig. 4e ). Aedeagus somewhat compressed laterally, with basal piece ca. four-fifths of total length, 2.2× longer than its greatest width ( Figs. 4 f–h); parameres asymmetrical, slightly longer than median lobe in dorsal view ( Fig. 4f ); right paramere overlapping transversely the left paramere in dorsal view (with apex of aedeagus pointing upwards as in Fig. 4f ); apical portion of parameres in lateral view evenly curved towards ventral face ( Figs. 4g ); ventral face of parameres bearing a row of short hairs along subapical portion ( Figs. 4f ); bearing a row of hairs in the subapical concave portion ( Figs. 4g, h ); most part of the median lobe hidden by parameres in dorsal view, in lateral view apex strongly acuminate, directed towards ventral face ( Figs. 4g, h ).

Etymology. The new species was named in memory of Dr. Ricardo Andreazze who presented us with his friendship, contributions, and encouragement to the knowledge of the insects, especially for his passion for the Amazon.

Distribution. Brazil (Roraima).

Biology. The specimens were collected in ponds with abundant macrophyte cover ( Figs. 1, 2 ).

Taxonomic comments. B. andreazzei sp. n. can be placed in the sticticus -complex ( Oliva 1989; Oliva & Short 2012) based on the following characteristics: dorsal sculpture fine (varying from coarse to fine in the complex); elytra with humeral humps not prominent and without spine-like hairs; abdominal ventrites medially carinate behind metacoxae without lateral depressions in the first ventrite; protarsus of males with soles on the two basal tarsomeres, which are weakly swollen (weakly to moderately swollen in the complex); and male genitalia on which parameres are acuminate, and median lobe weakly curved (strongly or weakly curved in the complex). The new species is similar to Berosus llanensis Oliva & Short, 2012 and Berosus guyanensis Queney, 2006 in the combination of the following characters: body length, shape of first abdominal ventrite and notch in the fifth abdominal ventrite. B. andreazzei sp. n. differs from B. llanensis especially by the shape of the meso- and metaventral processes. B. andreazzei sp. n. has a laminar mesoventral process with short anterior tooth directed downward and backward ( Fig. 4d ), and a wide metaventral process with posterolateral angles produced into rounded laminae and posterior angle not raised ( Fig. 4c ), while in B. llanensis the mesoventral process having a large and straight anterior tooth, directed downwards and metaventral process small with posterolateral angles produced into small triangular laminae and posterior angle raised into a rounded lamina, convex in lateral view. In addition, B. andreazzei sp. n. differs from B. guyanensis and all other species of the sticticus -complex by having the male genitalia with asymmetric parameres, the right paramere being positioned transversally over the left paramere ( Fig. 4f ).

Figures

FIGURE 4. Berosus andreazzei sp. n. (A–C) Habitus, A) dorsal view; B) lateral view; C) ventral view; D) Mesoventral process, ventral view, E) Abdomen, ventral view; (F–H) Aedeagus, F) dorsal view; G) lateral view; H) ventral view.

FIGURES 1–3. Habitat and type locality of the Berosus new species: 1) Brazil: Roraima State: Boa Vista County, pond near the RR-205 road, 2) detail of the habitat. 3) Type locality of Berosus andreazzei sp. n. (triangle), Berosus illuviosus sp. n. (square) and Berosus parvus sp. n. (circle).