Dohrnemesa oliveirai, Gil-Santana, Hélcio R. & Ferreira, Rodrigo Lopes, 2016

Gil-Santana, Hélcio R. & Ferreira, Rodrigo Lopes, 2016, A new species of Dohrnemesa from Brazil, with notes on the male of D. carvalhoi and on D. albuquerquei (Hemiptera: Heteroptera: Reduviidae: Emesinae), Zootaxa 4173 (6), pp. 583-595 : 588-591

publication ID 10.11646/zootaxa.4173.6.6

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Dohrnemesa oliveirai

sp. nov.

Dohrnemesa oliveirai View in CoL sp. nov.

( Figs. 13–35 View FIGURES 13 – 16 View FIGURES 17 – 24 View FIGURES 25 – 27 View FIGURES 28 – 32 View FIGURES 33 – 35 )

Diagnosis. Dohrnemesa oliveirai sp. nov. can be readily differentiated from other species of Dohrnemesa by its coloration, which, is almost completely light brown, with the exception of the lighter-colored antennal segment IV, fore and mid femorotibial articulations, prothoracic supracoxal lobes and lateral margins of the stridulitrum; other congeners are conspicuously marked ( Wygodzinsky 1966). Another diagnostic character of the new species is the vestiture comprising very long and very numerous, thin, light-colored setae, thus contrasting with the “more or less numerous interspersed slender hairs” (thin, long setae) that have been recorded in other species of Dohrnemesa ( Wygodzinsky 1966).

Description. Male. Measurements (mm): total length: to tip of abdomen 12.5; to tip of forewings 14.5; head: length 1.2; length of anteocular portion 0.5; length of postocular portion 0.2; lengths of antennal segments: I: 6.5; II: 5.8; III: 0.8; IV: 1.8; lengths of labial segments: II [first visible]: 0.5; III: 0.45; IV: 0.7. Thorax: pronotum: length of fore lobe 2.1; length of hind lobe 1.5; width at posterior margin 1.2; length of forewing 9.6. Fore legs: length of coxa 1.9; length of femur 4.3, maximum width of femur 0.2; length of tibia 3.8; length of tarsus 0.45; middle legs: length of femur 8.5; length of tibia 12.6; length of tarsus 0.45; hind legs: length of femur 11.1; length of tibia 17.5; length of tarsus 0.45. Abdomen: length 6.7; maximum width 1.3.

Coloration: light brown, except for antennal segment IV, fore and mid femorotibial articulations, prothoracic supracoxal lobes and lateral margins of stridulitrum, which are light-colored (yellow-whitish to whitish). Vestiture: head, first antennal segment, thorax, coxae, trochanters, femora and tibiae covered with very numerous and long thin setae, and with a short and very dense pubescence formed by thin, curved setae ( Figs. 13–17 View FIGURES 13 – 16 View FIGURES 17 – 24 ). The setae are pale, from yellowish to golden-yellowish. Antennal segment I with setae of intermediate length between the adpressed setae of the pubescence and longer setae; these intermediate setae lie somewhat parallel to the segment ( Fig. 17 View FIGURES 17 – 24 ); segments II– IV covered with short, adpressed, straight or somewhat curved, thin setae ( Figs. 18–21 View FIGURES 17 – 24 ); eight trichobothria were observed on segment II, seven of them in its basal portion. One in its middle third. Labium: segment II (first visible) with somewhat numerous moderately short setae; segment III with some very short setae ventrally; segment IV glabrous. Hind lobe of pronotum somewhat less setose on central portion dorsally. Scutellum and spine of metanotum with numerous moderately short, thin setae ( Fig. 16 View FIGURES 13 – 16 ). Forewing: basal plates with groups of moderately long, thin setae ( Fig. 26 View FIGURES 25 – 27 ); costal vein with long, thin setae, which are more numerous on basal half and sparse on median third ( Figs. 26–27 View FIGURES 25 – 27 ); some long, thin setae at basal portion of PCu+1A vein too ( Fig. 26 View FIGURES 25 – 27 ); remainder of the fore wing and hind wing glabrous. Ventral surface of fore femora with two series (posteroventral and anteroventral) of spine-like setae ( Fig. 22 View FIGURES 17 – 24 ).

Posteroventral series beginning at base of femur, composed of large and small spiniferous processes; large processes with lighter base and darkened distal spiny portion, numbering about sixteen elements, subequal in size, the most basal of which with its apex inclined ( Fig. 22 View FIGURES 17 – 24 ); among these large processes, several small spiniferous processes; at apical portion of femur, the larger processes are absent and the others are smaller. Anteroventral series beginning somewhat apicad of posteroventral one ( Fig. 22 View FIGURES 17 – 24 ), not interrupted at base, composed of around eleven medium-sized spiniferous tubercles, among which there are also several sharp small spines. Posteroventral series accompanied by numerous long, slender, sclerotized setae, which become shorter at distal portion. Fore tibiae with numerous stiff setae on subapical dorsal depression ( Fig. 23 View FIGURES 17 – 24 ); ventral surface with about twenty larger spiniferous processes, subequal in size, most of which with lighter base and darkened spiny distal portion, among which numerous small sharp spines ( Figs. 23–24 View FIGURES 17 – 24 ); long ventral setae somewhat straighter and more sclerotized; a cluster of stiff somewhat curved golden setae on apical extremity, ventrally ( Figs. 23–24 View FIGURES 17 – 24 ). Tarsi covered with moderately long setae ( Fig. 24 View FIGURES 17 – 24 ). Vestiture of abdomen similar to that of thorax ( Fig. 15 View FIGURES 13 – 16 ), but there are also many setae of intermediate length between the short setae that form the pubescence and the longer setae.

Structure. Integument moderately shiny. Head ( Figs. 13–14 View FIGURES 13 – 16 ) elongated; anteocular portion longer than postocular; transversal (interocular) sulcus deep, situated somewhat posteriad to middle of eyes; eyes globose, prominent in dorsal view ( Fig. 14 View FIGURES 13 – 16 ), reaching dorsal outline of head at interocular sulcus and slightly surpassing ventral outline of head ventrally. Antenna inserted somewhat closer to apex of head than to the eyes; antennal segments progressively thinner, very slender ( Figs. 13 View FIGURES 13 – 16 , 17–21 View FIGURES 17 – 24 ); segments I–III straight ( Figs. 17–20 View FIGURES 17 – 24 ); segment IV somewhat curved, with apex fusiform ( Fig. 21 View FIGURES 17 – 24 ). First two visible labial segments thicker than the distal segment ( Fig. 13 View FIGURES 13 – 16 ); apex of segment III at level of midportion of eye ( Fig. 13 View FIGURES 13 – 16 ); segment IV ending at level of anterior portion of stridulitrum. Thorax: pronotum pedunculate ( Fig. 13 View FIGURES 13 – 16 ); fore lobe approximately 1.4 times longer than hind lobe, elongate, somewhat oval on anterior portion ( Fig. 14 View FIGURES 13 – 16 ); anterior projections of collar rounded; transverse interlobar sulcus faint; hind lobe bell-shaped in dorsal view; lateral margins of stridulitrum conspicuous. Humeral angles rounded and somewhat elevated. Spine of scutellum somewhat elongated, directed backwards, horizontal, apex obtuse ( Fig. 16 View FIGURES 13 – 16 ); spine of metanotum of approximately the same length as the spine of scutellum, similar shape but directed upwards ( Fig. 16 View FIGURES 13 – 16 ). Fore legs slender ( Fig. 13 View FIGURES 13 – 16 ); fore coxae elongated, almost as long as fore lobe of pronotum; fore femora about 21 times as long as its greatest width, almost straight but slightly curved at midportion; fore tibiae slightly shorter than fore femora, somewhat curved and about half the thickness of the fore femora at their midportion; slightly depressed in dorsal portion subapically; thickened at apex, where the inner surface is somewhat flattened and has a very small subdistal pecten ( Figs. 23–24 View FIGURES 17 – 24 ). Mid and hind legs very long and slender, with tibiae somewhat thinner than femora and slightly curved in distal third. Tarsi short, three-segmented, slender ( Fig. 24 View FIGURES 17 – 24 ). Forewings surpassing apex of abdomen by approximately 2.0 mm, venation as in Figs. 25–27 View FIGURES 25 – 27 ; basal cell subtriangular, with its base narrowly truncated and with two basally veins emitted from its base ( Fig. 25, 27 View FIGURES 25 – 27 ); the outer vein shorter ( Figs. 25–26 View FIGURES 25 – 27 ); PCu meeting basal cell slightly before its inner distal angle ( Figs. 25, 27 View FIGURES 25 – 27 ); pterostigma ending far from apex of the wing ( Fig. 25 View FIGURES 25 – 27 ). Hind wings badly damaged therefore venation could not be observed. Abdomen: slender, sides parallel. Last tergite with a short tongue-shaped prolongation posteriorly, with a rounded posterior margin, slightly approaching tip of pygophore ( Fig. 28 View FIGURES 28 – 32 ). Eight sternite with numerous long setae on its exposed portion, covering approximately two thirds of the pygophore, ventrally; anterior margin curved backwards at mid portion; posterior margin straight. Male genitalia ( Figs. 29–35 View FIGURES 28 – 32 View FIGURES 33 – 35 ): pygophore subrectangular in dorsal and ventral views ( Fig. 29 View FIGURES 28 – 32 ), with numerous long setae on distal third (i.e. on naturally exposed surfaces); anterior dorsal sclerotization narrow; basal margin curved backwards on midportion ventrally ( Fig. 29 View FIGURES 28 – 32 ); posterior process triangular, apex subrounded ( Fig. 30 View FIGURES 28 – 32 ). Parameres symmetrical, curved and with moderate long and non-numerous setae in distal half; apex subrounded ( Fig. 31 View FIGURES 28 – 32 ). Phallus symmetrical. Basal arms of articulatory apparatus very short ( Figs. 33–34 View FIGURES 33 – 35 ); basal plate extension elongated, somewhat narrower towards apical half ( Fig. 34 View FIGURES 33 – 35 ); struts long, elongated, and almost entirely fused, divided at extreme base and apex, at the latter more broadly, with apical margins rounded ( Fig. 34 View FIGURES 33 – 35 ). A pair of elongated large ventral sclerotizations on phallosoma (= ventral sclerotization of phallobase sensu Wygodzinsky 1966) ( Fig. 34 View FIGURES 33 – 35 ), which also have a submedian prolongation directed laterally; between the latter and struts, a pair of elongated, thin and somewhat sclerotized processes, with arms parallel in proximal half and divergent in distal half; apex acute ( Fig. 35 View FIGURES 33 – 35 ). These processes lie on a denser and rough subrectangular layer of tissue, with a subrounded smoother base ( Fig. 35 View FIGURES 33 – 35 ). Endosoma wall smooth ( Fig. 32 View FIGURES 28 – 32 ).

Distribution. Brazil, state of Pará.

Etymology. The new species is named in honor of Marcus Paulo de Oliveira, biospeleologist, for his contributions to the knowledge of the ferruginous caves of Carajás region, northern Brazil.

Specimen examined. MALE HOLOTYPE: BRAZIL, Pará, Parauapebas, Cave GEM, 1756, (50º8'12.110"W 6º7'58.369"S), 7.iv.2011, Marcus Paulo de Oliveira leg., 1 male ( MNRJ). GoogleMaps

Bionomics. The cave GEM 1756 (also known as cave N5SM2-040) has a length of 186 meters and it is in a dendritic “canga” (a superficial ferruginous breccia). It is located in a well-preserved area inside the Carajás National Forest. The cave has a large entrance that provides shelter for many invertebrates inhabiting the forest, which thus are not true cave-dwelling species. The holotype of Dohrnemesa oliveirai sp. nov. was found near the main cave entrance, around 6 meters from it, in a disphotic zone. Although 102 caves have been sampled in the region (known as “Morro II”), in both the dry and the rainy seasons, only one specimen was found. This strongly suggests that the finding of this species was probably accidental and its main habitat is more likely to be the forest rather than the caves. It is important to emphasize that although members of Emesinae are common in Brazilian caves, not all the species can establish populations in those habitats.


Museu Nacional/Universidade Federal de Rio de Janeiro













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