Carvalhoiella stysi Nieser, Pelli & Melo

Rodrigues, Higor D. D., Sites, Robert W. & Giehl, Nubia F. S., 2016, Revision of the Neotropical genus Carvalhoiella De Carlo (Heteroptera: Nepomorpha: Naucoridae), Zootaxa 4138 (3), pp. 577-590 : 585-588

Carvalhoiella stysi Nieser, Pelli & Melo

( Figs. 26–32 )

Carvalhoiella stysi Nieser, Pelli & Melo, 1999: 162 –163.

Discussion. This species was known in the literature only by females. In addition to the original description, it was recorded from the Serra da Canastra, which is close to the type locality ( Pelli et al. 2006). In some specimens, the posterior margin of the subgenital plate is almost straight, as in C. beckeri , which can lead to misidentifications if only this feature is considered. Thus, it is also necessary to examine the ventral coloration of the body and structures specific to males, including the genitalia.

Macropterous male. (n = 6) Length 9.12–10.72 (mean = 9.77); maximum width 6.08–7.04 (mean = 6.00). Similar to macropterous female in general structure and coloration except as follows: Tergum V asymmetrical, with concavity of posterior margin slightly displaced to left. Tergum VI asymmetrical with concavity larger on right lateral margin, without accessory genitalic process or posterior protuberance. Medial lobes of tergum VIII directed posterolaterally, with truncate or rounded apices ( Fig. 29 ). Parameres symmetrical, with concave anterior margin, acuminate apex. Pygophore with anterior margin between parameres straight, truncate ( Fig. 30 ). Phallosoma elongate, ventrally with pair of sclerotized lobes with posterior margins rounded and unarmed with teeth, with right ventral lobe larger than left lobe ( Fig. 31 ).

Diagnosis. The dark brown ventral color pattern ( Fig. 27 ) and the shallowly concave posterior margin of the female subgenital plate ( Fig. 28 ) are diagnostic. It is most similar to C. acuminata sp. nov. because both species have the ventral coloration of the body dark brown and the medial lobes of tergum VIII of the male have the apices rounded. However, C. stysi can be differentiated from it by the concave posterior margin of the female subgenital plate, whereas it is broadly acuminate in C. acuminata sp. nov.

Distribution. This species was known only from the state of Minas Gerais in southeastern Brazil ( Nieser et al. 1999; Pelli et al. 2006). Here we examined specimens from new localities in Minas Gerais and specimens from the northern part of the state of Goiás, central-western Brazil, which represents the northernmost record of this species ( Fig. 32 ).

Type material examined. Holotype, macropterous ♀ ( DPIC), BRAZIL, Minas Gerais, São Roque de Minas, NE edge of Serra da Canastra, 20°15’12”S / 46°24’24”W, N. Nieser & A. Pelli col.

Additional material examined. All specimens macropterous. BRAZIL, Goiás: 2♂ ( MZUSP), 2♂, 1♀ (UMC), Chapada dos Veadeiros, Cachoeira do Rio Prata, 13°25’06.3”S / 47°39’19.1”W, 1.062 m a.s.l., 02.I.2015, H. Rodrigues col. Minas Gerais: 1♂, 2♀ ( DPIC), 1♂, 1♀ (UMC), Parque Estadual do Rio Preto, 15.XII.2003, L.C. Bedê; 1♂ ( MZUSP), Serra do Cipó, MG-010, Km [kilometer] 106, 27.VII.1972, C.G. Froehlich col.; 1♂, 1♀ ( MZUSP), Serra do Cipó, Rio Brauninha, 12.V.1974, C.G. Froehlich & G.Y. Shimizu col.; 1♂ ( DPIC), Santana do Riacho, Rio das Pedras, 5642, 13.VII.2002, F. Leite col.; 2♀, 1 nymph ( MZUSP), Santana do Riacho, Lapinha da Serra, Cachoeira do Lajeado, 19°09’11.3”S / 43°38’52.1”W, 1.160 m a.s.l., 27.VII.2013, H. Rodrigues col.; 1♂ ( DPIC), São Vicente de Minas, rancho-porto, 7476, 01.V.1994, ALM 94030, A.L. Melo col.

Figures

FIGURE 32. Distribution records of all species of Carvalhoiella.

FIGURES 26 – 31. Carvalhoiella stysi. (26) Dorsal and (27) ventral habitus of female, (28) terminal abdominal sterna of female, (29) terminal abdominal terga of male (genital capsule removed), (30) genital capsule of male showing pygophore, phallosoma, and parameres, (31) ventral side of phallosoma. Size bar = 0.5 mm and pertains only to Figs. 30, 31.