Hyperbius joceliae, Carpintero & Biase, 2021

Carpintero, Diego Leonardo & Biase, Sebastián De, 2021, Hyperbius joceliae a new species of Ditomotarsinae from Tierra del Fuego, Argentina (Hemiptera: Acanthosomatidae), Zootaxa 4958 (1), pp. 668-677 : 669-671

Hyperbius joceliae n. sp.

( Figs 1–6 )

Holotype. Female. MACN-En. 34228. ARGENTINA: Tierra del Fuego, Female, San Sebastián , IV/1971 ( MACN).

Etymology. The specific epithet is given in honor of Dr. Jocélia Grazia for her enormous contribution to the knowledge of South American Pentatomomorpha; noun in apposition.

Description. Female: Measurements (n = 1): Total length: 5.79; width: 2.84. Head. Length: 0.95; width: 1.42; interocular space: 0.93; antennal segment lengths I: 0.32; II: 0.55; III: 0.38; IV: 0.58; V: 0.66. Pronotum. Length: 1.10; width at base: 2.55.

General coloration shiny dark brown dorsally ( Fig. 1 ). Apex of anteclypeus and mandibular plates, antennal segments I, II, basal half of III and extreme base of IV, lateral margins of the pronotum and median line to the level of the base of the calli, pale yellowish. Apical half of antennal segment III and ¾ apical of IV, reddish brown. Scutellum dark reddish brown; scutellum, internal margin of the endocorium, and external margin of the exocorium, lighter than the rest, without becoming pale. Ventrally the same color as the dorsum, with the basal half of head whitish, bucculae, rostrum and legs yellowish brown. Membrane translucent, smoked. Dorsal surface with erect, short and very scattered pilosity. Well-marked and densely dispersed punctures on the entire dorsal surface.

Head ( Fig. 2 ). Wider than long, with subtle punctures and rugosities on the lateral margin of the mandibular plates. The anterior margin of the latter approximately at the same level as the anteclypeus. First antennal segment short, just reaching the apex of the head; second segment very short but longer than the third and sub-equal to the fourth, the fifth segment is the longest. Eyes prominent and externally rounded, with their internal and basal margin straight, with an angular shape. Ocelli rounded, larger than superficial punctures, not contiguous with pronotum. Bucculae very thin; labium arising the posterior coxae; first labial segment short, which does not exceed the posterior margin of the bucculae. The second segment is the longest, third and fourth segments of sub-equal length, these last with long erect hairs on their ventral surface.

Thorax. Pronotum subquadrangular, more than twice as wide at its base as long, laterally thinned but lacking a true carina. Dorsal surface covered by thick, sparse and dark inside punctures with anterior margin of calli with thinner and more densely arranged punctures; calluses nearly smooth. Scutellum longer than wide, apically thin, with punctures more densely sparse on its apical half; clavus with longitudinal scores in all its extension: three rows at its base, but only one reaching its apex, the inner one; hemelytra very little convex laterally; corium dense and homogeneously punctured; membrane hyaline grayish, smoky and with a few weak longitudinal veins. Sternal region covered with brown punctures, denser on prosternum; meso and metasternum mostly smooth. Scent gland peritreme ( Fig. 3 ) large, with a wide opaque evaporatorium, occupying the anterior half of the metapleura and delimited by an irregular groove; this area is continued in the posterior half of the mesopleura, very similar to that present in H. geniculatus showing its shape to be a generic character. Legs with erect silvery pilosity on its inner margin more densely towards its apical half. Second tarsal segment of length equal to the first.

Abdomen ( Fig. 4 ). Sparse but homogeneously punctured throughout. Connexivum of the same color as the rest of the abdomen. Genitalia ( Fig. 6 ). First gonocoxae wider than long, light brown, faintly rough longitudinally; second gonocoxae with each gonocoxite subquadrangular, light brown, with faintly marked transverse roughness; paratergite 9 subtriangular, apically less acute than in H. geniculatus , also light brown, only with its apical margin clear and smooth.

Distribution. ARGENTINA: Tierra del Fuego.

Male. Unknown.

Host Plant. Unknown.

Discussion. The characters that differentiate this species from Hyperbius geniculatus (Signoret) are the following: smaller size, still smaller than any of the 18 H. geniculatus specimens that we have studied and with shorter pilosity. Color is dark brown, while in H. geniculatus , it is black with more well-delimited pale yellowish areas. Head punctures are less noticeable than in H. geniculatus . Mandibular plates hardly reach the apex of the anteclypeus, whereas in H. geniculatus , they surpass it. Antennae are relatively shorter and clearer in the new species. In H. joceliae , the first segment reaches the apex of the head, in H. geniculatus , it far exceeds it. The pronotal calli are smooth, with a few scattered minute punctures. In H. geniculatus , the calli also have minute but denser punctation. The female genitalia has some well-marked differences such as the shape and color of paratergite 9, the texture of gonocoxite I and the shape of gonocoxite II. It is also worth noting the geographical location of the type, which was found in the northeast corner of the Isla Grande of Tierra del Fuego, a Patagonian steppe sector ( Morrone, 2001) and very close to the sea.

Figures

FIGURES 1–6. Hyperbius joceliae n. sp. 1. Dorsal View. 2. Head. 3. Metapleura. 4. Abdomen. 5. Pendergrast’s Organ. 6. Female genitalia. Caudal view.