Carvalhoiella montandoni (La Rivers) Reynoso-Velasco, 2017

Reynoso-Velasco, Daniel, 2017, New combinations, status, and species of Neotropical Ambrysini (Heteroptera: Naucoridae: Cryphocricinae), Zootaxa 4323 (4), pp. 503-518 : 506

Carvalhoiella montandoni (La Rivers) NEW COMBINATION

Figs. 8–13

Ambrysus montandoni La Rivers 1963 : Biol. Soc. Nevada Occas. Pap. 1: 1–5 (original description). Ambrysus (Syncollus) montandoni: La Rivers 1965 . Biol. Soc. Nevada Occas. Pap., 4: 5 (subgenus designation). Ambrysus montandoni: Sites & Nichols 1999 . Proc. Entomol. Soc. Wash. 101: 5–6 (egg description). Ambrysus montandoni: Rodrigues et al. 2012 , Zootaxa 3357: 63–68 (redescription).

Diagnosis. Body length 11.20–12.96 mm. The dorsum is tuberculate, dull, and irregularly mottled ( Fig. 8 ). A sharp sulcus marks the anterior margin of the posterior transverse band on the pronotum. Tergum VI of the male lacks an accessory genitalic process ( Fig. 9 ). Laterosternites are absent on III–V (males) and III–IV (females) and the abdominal venter is lightly colored with a wide, glabrous, yellow marginal band. The midline of sterna V–VIII (males) and V–VII (females) are mostly glabrous and impubis. The pseudoparameres are large, broad, sharply angled posterolaterad, with angulate apices, and overlapping and extending beyond the lateral lobes of tergum VIII ( Fig. 10 ). The proctiger is setose in the lateral thirds and nearly devoid of setae in the middle third ( Fig. 11 ). The parameres have an apical tuft of elongate setae ( Fig. 12 ). The ventral margins of the phallosoma have two hemispherical, lamellate, sclerotized lobes near the base of the endosoma ( Fig. 13 ). The distal margin of the female subgenital plate is deeply cleft medially (see Rodrigues et al. 2012, Fig. 8 ).

Discussion. The expression of laterosternites has been partially suppressed in this species. Laterosternites III– V in males and III–IV in females are absent, and the mesal margin of V in females is incomplete; the laterosternites are complete thereafter, although difficult to discern beneath the dense hair pile. Although this large species is superficially reminiscent of Cataractocoris , it shares diagnostic attributes consistent with Carvalhoiella , including the loss of setae on the abdominal mediosternites, the head is not produced anteriorly, the anterior margin of the pronotum is only slightly concave to receive the head, the mesal margins of the laterosternites are diagonally offset from one another, the ventral abdominal lateral band is wide, and the pseudoparameres are large and posterolaterally directed ( Table 1). It lacks many of the distinguishing features of the genus Ambrysus , including deep invagination of the head into the pronotum, continuous ventral abdominal hair pile, continuous mesal margins of the laterosternites, narrow ventral abdominal lateral band, small male pseudoparameres, and male accessory genitalic process of tergum VI ( Table 1). Thus, Ambrysus montandoni is transferred to the genus Carvalhoiella .

This species is known only from the Guiana Shield in Brazil, Guyana, and Venezuela. It is perhaps most famously known from El Tobogan de la Selva in Venezuela, which is a large, smooth, rolling granitic slide where water flows in a laminar fashion. Carvalhoiella montandoni can be found here along with C. maldonadus in cracks in the rock and under dead leaves. At El Tobogan, this species was collected with Ambrysus shorti Sites , Carvalhoiella maldonadus (La Rivers) (Naucoridae) , Fontidessus toboganensis Miller (Dytiscidae) , Berosus garciai Oliva & Short , and Oocyclus petra Short & García (Hydrophilidae) .

Type locality: Venezuela, Territorio Amazonas, Mount Marahuaca, Upper Cunucunuma River.

Type repository: California Academy of Sciences (holotype ♂ by original designation).

Material examined. BRAZIL: Roraima State, Yanomami indigenous area, Serra de Surucucu (02°49’53.78”N, 63°38’19.78”W), stream without name, 24.XI.1991, V. Py-Daniel and U. Barbosa coll., (1♂ INPA); same data, except collected in river of the waterfall, (1♂ INPA; 1♂, 1♀ DPIC); Yanomami indigenous area, Xitei/Xidéa indigenous park (02°36’20.54”N, 63°52’27.76”W), Igarapé das Irmãs, 17.XI.1993, V. Py-Daniel and U. Barbosa coll., (1♂, 1♀ INPA). GUYANA: Lethem (25 km SE), Kumu Falls, 3°15.9'N, 59°43.6'W, 4 April 1994, PJ Spangler / colln. #14, side pool at base of falls (2♂, 3 immatures USNM). VENEZUELA: Venezuela Exp., Territ. Amazonas, Culebra, N. Duida, June 9, 1950 / J. Maldonado Capriles Coll. / Ambrysus montandoni La Rivers HOLOTYPE / Ambrysus montandoni La Rivers , determined by Ira La Rivers / Ira La Rivers Collection, Bequeathed to the California Academy of Sciences—1978 / California Academy of Sciences Type No. 13411 (Holotype ♂ CAS); Amazonas State, N Puerto Ayachucho, nr Iboruwa, "Tobogancito", 13 January 2009 / 5°48.414'N, 67°26.313'W, 80 m, VZ-20090113-02, coll: J. Camacho (1♂, 1♀ UMC); Amazonas State, S Puerto Ayachucho, El Tobogan de la Selva, 14 January 2009 / 5°23.207'N, 67°36.922'W, 125 m, VZ-20090114-01, coll: J. Camacho (4♂, 4♀ UMC); Amazonas, 42 km S of Puerto Ayacucho Tobogan, 19 January 1989, J.T. Polhemus, CL2371, (2♂, 2♀ UMC); Bolivar, 108 km. SW Sta. Elena de Uairen, 4 July 1978, R.S. Miller / blackwater stream (1♂ UMC).

Figures

FIGURES 8 – 13. Carvalhoiella montandoni. (8) Dorsal habitus, (9) abdominal terga VI and VII of male, (10) abdominal tergum VIII of male with pseudoparameres, (11) male genital capsule, (12) male genital capsule with terga IX and X (proctiger) removed, (13) ventral surface of phallosoma.