Dichelops (Diceraeus) caatinguensis Grazia

Poock-Da-Silva, Priscila, Barão, Kim Ribeiro & Grazia, Jocelia, 2013, Contributions to the knowledge of Dichelops Spinola: description of a new species of Dichelops (Diceraeus) and of the male of Dichelops (Prodichelops) divisus (Hemiptera: Heteroptera: Pentatomidae: Pentatominae: Carpocorini), Zootaxa 3609 (1) : -

Dichelops (Diceraeus) caatinguensis Grazia & Poock-da-Silva sp. nov.

( Figs. 1 , 3–15 )

Etymology. The name is related to its geographic distribution (Caatinga biome, northeast Brazil, Rio Grande do Norte, Paraíba, Pernambuco, and Bahia states).

Type material. Holotype ♂, labeled: BRAZIL, Paraíba, Soledade , Juazeirinho, 08.VII.1956, A.G.A. Silva col., Coleção Campos SEABRA ( MNRJ). Paratypes: 13, 1♀, BRAZIL, Rio Grande do Norte, Baixa Verde , VII.1950, B.J. Souza col., Coleção Campos SEABRA ( UFRG) ; 1♀, Paraíba, Soledade, Juazeirinho , 22.III.1956, A.G.A. Silva col., Coleção Campos SEABRA ( MNRJ) ; 13, Paraíba, Soledade, Juazeirinho , 08.VII.1956, A.G.A. Silva col., Coleção Campos SEABRA ( MNRJ) ; 13, 10♀, Pernambuco, Casa Nova , V.1974, J.C.M. Carvalho col., Caatinga, (13, 2♀ UFRG, 8♀ MNRJ) ; 6♀, Pernambuco, Petrolina , V. 1974, J.C.M. Carvalho col., Caatinga (2♀ MCNZ, 4♀ MNRJ) ; 1♀, Pernambuco, Petrolina, V.1969, M. Alvarenga col. ( MNRJ) ; 1♀, Pernambuco, Petrolina, Estrada Picos , V.1974, J.C.M. Carvalho col., caatinga ( MNRJ) ; 1♀, divisa entre Pernambuco e sul do Piauí, Estrada Picos Km3, V.1974, J.C.M. Carvalho col., caatinga ( MNRJ) ; 13, Bahia, Anajê , 16.V.1975, C. & P. Elias col. ( MCNZ) ; 13, 1♀, Bahia, Brumado , 9.V.1975, C. & P. Elias col. (DZUP 212768 , 212766 ) ; 13, 4♀, Bahia, Juazeiro , V.1974, J.C.M. Carvalho col., Caatinga (♀ MNRJ) ; 1♀, Bahia, Juremal, Estrada do Juazeiro, V.1974, J.C.M. Carvalho col., Caatinga ( MNRJ) ; 1♀, Bahia, G. Bondar col .; 13, 2♀, nordeste, 1933, Ihering col. (13 UFRG; 2♀ FIOC) ; 2♀ ( MZSP 72407 , 72408 ) .

Description. Ovoid, medium-sized (8–10mm) species. Dorsal color castaneous ( Fig. 1 ), lighter castaneous ventrally.

Head slightly longer than wide ( Fig. 1 ). Dorsal surface with coarse punctures regularly distributed, except in a circular area adjacent to eyes; ventral surface with sparsely distributed punctures. Juga clearly surpassing clypeus, length before clypeus equals one-third of first antennal segment; lateral margins straight, often convergent, and outlined by black, apex obtuse. Proportion of antennal segments: I<II<III<IV>V. Rostrum slightly surpassing metacoxae. First rostral segment entirely contained between buccula. Proportion of rostral segments: I<II>III>IV. Pronotum. Anterolateral margins serrated. Posterolateral margins sinuated. Humeri varying from rhomboid to acutely projected, black at apex. Cicatrices sometimes delimited by dark punctures. Darker punctures concentrated at middle pronotum, forming a rounded spot.

Scutellum. Surface uniformly punctured, forming rounded areas lacking punctures. Two pairs of black spots formed by concentrated punctures, one basally and other medially. Distal region without punctures, bearing a yellow callus. Small black fovea at basal angles.

Hemelytra. Rusted-red punctures uniformly distributed. Reddish radial vein. Black spots near distal apex of radial vein.

Ventral surface light castaneous, punctures uniformly distributed and thinner than those on dorsal surface. Spiracles concolorous to ventral surface. Connexivum light castaneous, with dark spots at anterior and posterior margins. Legs light castaneous, with reddish spots in all segments.

Male genitalia. Pygophore subquadrangular ( Figs. 5–8 ); genital cup well exposed dorsally ( Figs. 5–6 ). Dorsal rim medially sinuated ( Figs. 5–6 ). Superior process of dorsal rim conspicuous, as a sinuated flap projected into genital cup towards paramere base ( Fig. 6 ). Posterolateral angles slightly projected, without bristle tufts. Ventral rim bisinuated, in a ‘V’ excavation at middle, with bristle tufts ( Figs. 7–8 ). Parameres elongated, robust and flattened, directed dorsally. Paramere head as long as base, with a digitiform projection on inner surface ( Fig. 9 ). Phallus almost pyriform in lateral view ( Fig. 12 ); processus phallothecae not surpassing conjunctiva ( Figs. 10, 12 ); ventral process of conjunctiva projecting towards phallotheca ventral wall ( Figs. 10, 12 ); processus vesicae embracing ductus seminis distalis ( Fig. 11 ).

Measurements (n=6). Body length 8.81±0.22 (8.48–9.12); abdominal width 5.09±0.28 (4.8–5.44); head length 2.13±0.096 (2.08–2.32), width 2.07±0.12 (1.92–2.24); interocular distance 1.24±0.067 (1.2–1.36); length of antennal segments: I – 0.55±0.06 (0.48–0.64), II – 0.83±0.082 (0.8–0.96), III – 1.13±0.15 (0.96–1.36), IV – 1.16±0.62 (1.12–1.84), V – 1.16±0.61 (0.96–1.36); pronotum length 2.04±0.13 (1.84–2.24), width 4.92±0.34 (4.4–5.36), width including spines 5.89±0.4 (5.52–6.64); scutellum length 3.0±0.13 (2.8–3.12), width 3.11±0.12 (2.88–3.20).

Female genitalia. Gonocoxites 8 almost triangular, not covering gonocoxites 9; sutural margins sinuated, overlapping at base, sutural angles acute, tumid areas occupying ½ of each plate ( Figs. 13–14 ). Laterotergites 8 acute at apex, but not forming a spine. Laterotergites 9 obtuse at apex, not surpassing laterotergites 8 ( Figs. 13–14 ).

Posterior margin of gonocoxites 9 biconvex. Chitinellipsen rounded ( Fig. 15 ). Ductus receptaculi before vesicular area almost three times longer than ductus after vesicular area ( Fig. 15 ). Internal wall of vesicular area conical at base; median wall dilated at basal quarter of vesicular area ( Fig. 15 ). Basal half of pars intermedialis looselytwisted; anterior annular flange flat, posterior annular flange convergent. Capsula seminalis rounded, lacking processes.

Measurements (n=31). Body length 9.56±0.37 (9.2–10.24); abdominal width 5.57±0.22 (5.28–5.92); head length 2.13±0.2 (1.92–2.48), width 2.22±0.07 (2.16–2.32); interocular distance 1.34±0.09 (1.28–1.52); length of antennal segments: I – 0.56±0.07 (0.48–0.64), II – 0.85±0.065 (0.8–0.96), III – 1.2±0.06 (1.12–1.28), IV – 1.50±0.14 (1.36–1.68), V – 1.4±0.1 (1.28–1.52); pronotum length 2.28±0.16 (2.08–2.48), width 5.47±0.3 (5.12–5.92), width including spines 6.47±0.5 (5.92–7.2); scutellum length 3.64±0.13 (3.44–3.76), width 3.61±0.21 (3.28–3.84).

Comments. Dichelops caatinguensis sp. nov. is similar to Dichelops lobatus . From D. lobatus it can be distinguished by being smaller in length (male: 8.81± 0.22 mm; female: 9.56± 0.36 mm); by the presence of a yellow spot at the scutellum apex, which in D. lobatus is a stripe; connexivum with 1+1 dark spots at the anterior and posterior margins, while immaculate in D. lobatus ; jugae convergent or juxtaposed, while parallel in D. lobatus . In the male genitalia both species have the paramere and the superior process of the dorsal rim similar in shape; Dichelops caatinguensis sp. nov. can be distinguished from D. lobatus by the ventral rim’s being bisinuated, excavated in a ‘V’ at the middle, and with bristle tufts. Dichelops caatinguensis sp. nov. females can be distinguished from all Diceraeus species by the posterior margin of the gonocoxites 9 biconvex and by the pars intermedialis being loosely twisted along the basal half of its length.

Distribution. Northeast Brazil, corresponding to Caatinga, Cerrado, and Para biogeographic provinces (sensu Morrone, 2006).

Figures

FIGURES 1 – 2. Dorsal view: 1, Dichelops (Diceraeus) caatinguensis sp. nov.; 2, Dichelops (Prodichelops) divisus (Scales = 1 mm).

FIGURES 3 – 12. Dichelops (Diceraeus) caatinguensis sp. nov., male genitalia 3 – 4, pygophore, posterior view; 5 – 6, pygophore, dorsal view; 7 – 8, pygophore, ventral view; 9, left paramere, dorsal view; 10 – 12, phallus, ventral, dorsal and lateral views, respectively. (cj, conjunctiva; dr, dorsal rim; dsd, ductus seminis distalis; gs, secondary gonopore; pa, paramere; pcj, process of conjunctiva; ph, phallotheca; prph, processus phallothecae; prv, processus vesicae; spdr, superior process of dorsal rim; vr, ventral rim; X, proctiger) (Scales: figs. 3 – 8 = 0.5 mm; 9 – 12 = 0.15 mm).

FIGURES 13 – 15. Dichelops (Diceraeus) caatinguensis sp. nov., female genitalia. 13 – 14, genital plates, ventral view; 15, laterotergites, gonocoxites, and gonapophyses of ninth segment, and ectodermical genital ducts, ventral view (aaf, anterior annular flange; ch, chitinellipsen; cs, capsula seminalis; dr, ductus receptaculi; g 9, gonapophyses 9; gc 9, gonocoxites 9; la 9, laterotergites 9; or, orificium receptaculi; paf, posterior annular flange; pco, pars communis; pi, pars intermedialis; tvi, thickening of vaginal intima; va, vesicular area; X, tenth segment) (Scale: figs. 13 – 14 = 1 mm; 15 = 0.3 mm).