Hiranetis vanderheydeni, Gil-Santana, 2024

Gil-Santana, Hélcio R., 2024, Hiranetis vanderheydeni sp. nov. (Hemiptera: Reduviidae: Harpactorinae), an example of how a superficial evaluation may impair the taxonomy, Revista Chilena de Entomología (Rev. Chil. Entomol.) 50 (2), pp. 353-373 : 357-371

publication ID

https://doi.org/ 10.35249/rche.50.2.24.17

publication LSID

lsid:zoobank.org:pub:03140ABA-EA59-43B4-A7D2-906AB65A38C

persistent identifier

https://treatment.plazi.org/id/EF389C06-F836-FFFA-4597-FFFEFB1FFC47

treatment provided by

Felipe

scientific name

Hiranetis vanderheydeni
status

sp. nov.

Hiranetis vanderheydeni sp. nov.

( Figs. 6-43 View Figures 6-9 View Figures 10-17 View Figures 18-20 View Figures 21-22 View Figures 23-28 View Figures 29-33 View Figures 34-35 View Figures 36-39 View Figures 40-43 )

Notes. As commented above, in the former Entomological Collection of the MNRJ, among specimens of wasp-mimicking Harpactorini ( Fig. 1 View Figures 1-5 ), there were a lot of specimens belonging to Hiranetis identified [wrongly] as Hiranetis coleopteroides , actually a junior synonym of Graptocleptes bicolor ( Gil-Santana et al. 2013) , which in most part were in fact specimens of the new species described here. One of these specimens was photographed separately by the author ( Figs. 2-5 View Figures 1-5 ), supporting this assertive. Unfortunately, because all these specimen were destroyed ( Escobar 2018), they were not included in the present study.

Type material. BRAZIL, Minas Gerais, Juiz de Fora Municipality , iii. 1997, J. da Silva leg. 1 male holotype, 2 male paratypes, 6 female paratypes ; Rio de Janeiro, Cachoeiras de Macacu Municipality , xii.1995, 1 male paratype, N. Tangerini leg. ; Nova Friburgo Municipality , 1 female paratype. Etymology. The new species is named in honor of the German entomologist Torsten van der Heyden because of his valuable contributions to the knowledge of Heteroptera .

Diagnosis. The new species most closely resembles Hiranetis atra , both of which with a general blackish coloration and yellowish submedian anulli on middle and hind femora. However, while the adults of H. atra have the hemelytron completely blackish, those of H. vanderheydeni sp. nov. have a conspicuous yellowish spot on external and mid-distal portion of corium, reaching adjacent part of membrane, especially in basal portion of distal cell of membrane. The males of both species may be easily separated by their male genitalia. The apex of the pygophore of H. atra is subtriangular, while that of H. vanderheydeni sp. nov. has an almost straight margin, in which the median portion is globose and subhemispherical and the lateral angles are prominently acute. In the phallus, the basal plate arms are more elongated in H. vanderheydeni sp. nov. and the dorsal phallothecal sclerite (dps) is very different between them. While the dps is weakly sclerotized, flat, suboval in shape, with apical margin almost transverse and straight in H. atra , it is quite sclerotized, less flattened, triangular, with lateral margins thickened and covered by numerous thin sclerotizations in H. vanderheydeni sp. nov. and acutely shaped at apex. Additionally, while in H. vanderheydeni sp. nov. the arms of the struts are separated only basally, becoming enlarged and completely fused, tapering apically, forming an arrow shaped structure, the arms of the struts of H. atra are parallel and expanded at apex, forming a pair of assymetrical suboval/subsquared structures.

Description. Male ( Figs. 6-33 View Figures 6-9 View Figures 10-17 View Figures 18-20 View Figures 21-22 View Figures 23-28 View Figures 29-33 ). Measurements are given in Tab. 1. Coloration: general coloration black, brownish black, with reddish portions ( Figs. 6-12 View Figures 6-9 View Figures 10-17 ). Head, including antennae, black. Thorax mostly blackish; hemelytra generally black to brownish black, with a yellowish spot on external and mid-distal portions of corium ( Figs. 6-12 View Figures 6-9 View Figures 10-17 ), reaching adjacent part of membrane, especially in basal portion of distal closed cell of membrane ( Fig. 12 View Figures 10-17 ). Hind wing mostly black to brownish-black, with clear area at basal portion and in three lines parallel to veins. Fore femur black to dark brown, dorsal surface faintly paler on a submedian narrow basal marking and on distal dorsal portion, in holotype and three paratypes, and almost completely faintly paler in one paratype. Middle and hind femora black, with a well marked yellowish annulus situated somewhat basally to midportion of each femur ( Figs. 6-12 View Figures 6-9 View Figures 10-17 ). On both femora, the annuli are approximately 1/6 to 1/7 as long as the segment and its midpoint is about 8 to 9% basal from midpoint of the segment, respectively. Tibia and tarsi black. Abdomen: sternites II-III mostly reddish brown to light reddish ( Figs. 8 View Figures 6-9 , 11 View Figures 10-17 ); connexivum of segment II dark basally; sternite IV with variable extension of reddish color on its median portion; remaining segments with ill defined and variable reddish portions or completely blackish; genital capsule blackish. Structure and vestiture: integument mostly shiny, smooth. Head: gibbous, large, approximately or as long as wide across eyes; integument shiny, with sparse long and short, straight or somewhat curved blackish setae; the latter much denser, forming pubescence of long blackish thick setae on tubercle between ocelli, postocular portion and gula; almost completely glabrous between eyes. Anteocular portion longer than postocular; the latter, in dorsal view, shortly narrowing to form the neck. Postantennal tubercles very small, blunt, almost impercepible or absent. Clypeus straight and curved in dorsal and lateral views, respectively. Antenna inserted at level of upper half of eye, in lateral view. Scape and pedicel straight, with shiny and smooth integument, ventral surface of scape and base of both segments almost or completely glabrous; ventral surface of pedicel with less numerous setae; remaining portions of scape and pedicel covered with very numerous darkened short setae and scattered few sligtly longer setae; flagellomeres curved, with opaque and somewhat rugose integument; covered with dense, very short and somewhat lighter colored pubescence, with short darkened setae scattered on first flagellomere and few of these on second flagellomere; first flagellomere slightly thickened in basal half; distal half of first flagellomere and second flagellomere thinner than pedicel. Eyes globose, glabrous, projecting laterally, prominent in dorsal view, reaching dorsal margin of head at interocular sulcus in approximately the distal portion of its middle third; not reaching ventral margin of head, which is far from inferior margin of the eye. Interocular sulcus thin, curved moderately deep, reaching eyes at their approximatelly middle third; just anterior to it, on midline, a longitudinal short thin shallow sulcus, which may seem imperceptible. Ocelli and portion between them elevated, small, rounded, much closer to eyes than to each other. Labium stout, curved, with scattered and somewhat curved, longer and thinner dark setae, which are longer and more numerous on basal portion of anterior surface of first visible segment; segment II (first visible) thickest, straight, reaching level of middle portion of eyes, slightly longer than segment III; segment III somewhat curved; segment IV shortest, triangular, tapering, reaching level of posterior portion of prosternum. Neck thin. Thorax: with shiny and mostly smooth integument. Anterior collar inconspicuous; anterolateral angles subtriangular; prothorax densely covered with very numerous blackish thick setae on forelobe, propleura and prosternum. Transverse sulcus moderately deep, interrupted before middle by a pair of submedian shallow carina. Midlongitudinal sulcus on forelobe of pronotum becoming abruptly deeper at transverse sulcus to form a depression; posteriorly to the latter, a blunt short rounded prominence. Hind lobe of pronotum with sparse long setae at dorsal portion or, almost glabrous, except on midline, where thinner, somewhat shorter and light yellowish to whitish setae, which sometimes are associated with a small amount of white wax-like substance, forming a faint midlongitudinal line on hind lobe; the latter is completely absent or only partially present among individuals; midlongitudinal furrow very shallow, absent on basal and distal portions or almost not evident; lateral longitudinal sulci well marked at posterior half to posterior two-thirds. Humeral angle slightly elevated, rounded at lateral margin. Scutellum elevated at disc, rounded posteriorly; glabrous on elevated portion, with scattered blackish long setae laterally. Mesopleura and metapleura with sparse and long blackish setae, which are much shorter and less numerous at center of mesosternum and metasternum; mesosternum with a median U-shaped carina posteriorly. Legs: coxae almost completely glabrous on basal and dorsal portions, with few to numerous dark stout setae on distal half to distal third, and ventrally; trochanters densely covered with long setae laterally; all femora thicker basally and slightly subapically too, covered with scattered few long and strong dark setae and with a dense group of long and thick setae and some thinner and even longer setae on ventral portion of the basal enlarged portion of femora. Fore tibiae somewhat curved to straight, with uniform thickness, except at apex, which is somewhat enlarged, and where there is a short dorsal spur and a small mesal comb. Middle tibiae straight; hind tibiae variable, slightly curved at median portion to straight as observed in holotype. All tibiae with scattered long thin blackish setae; fore and middle tibiae covered with shorter dark setae on ventral surface, which become progressively more numerous towards apex, where they also cover lateral and dorsal surface; hind tibiae, except at base, densely covered with short dark setae, which are less numerous basally. Tarsi with moderately long dark setae. Hemelytra long, surpassing abdomen by about half length of membrane; corium with curved scattered adpressed short dark setae, which are much more numerous over costal and subcostal veins, becoming less numerous on distal half of corium, including over those veins; membrane glabrous. Abdomen: elongate; spiracles rounded; sternites with shiny integument and sparse long thin setae, which are light on reddish portions and dark on the blackish segments, and thicker, longer and more numerous on parts adjacent to genitalia and on the latter too. Patches of minute, short, adpressed, thin, whitish setae present on basal half of midlateral portions of sternites III, IV and sometimes V; these setae are frequently covered with a variable amount of white wax. On sternite III the patch is small and subrounded; on sternite IV and V (when present), larger and elongated. Abdominal segment VIII completely concealed, blackish and sclerotized only on ventral face, which is subrectangular, with a small rounded prominence on median portion of posteroventral margin in one individual, and a small prolongation on basal portion, directed dorsad; dorsal portion entirely membranous and narrower; spiracles on dorsal margin of ventral portion. Male genitalia ( Figs. 13-33 View Figures 10-17 View Figures 18-20 View Figures 21-22 View Figures 23-28 View Figures 29-33 ): pygophore (py) blackish, suboval in ventral view, with an enlarged apex in which the posterior margin is almost straight, slightly curved laterally, its median portion globose and subhemispherical, and lateral angles prominently acute and slightly curved ( Figs. 14, 16-17 View Figures 10-17 ); between an terior and posterior genital openings, a very well sclerotized dorsal (transverse) bridge (db) with a conspicuous median rounded dorsal prominence ( Fig. 17 View Figures 10-17 ); proctiger (pt), enlarged toward its apex, posterior margin curved ( Fig. 17 View Figures 10-17 ); exposed surface of pygophore with long, thick and dark setae ventrally; these setae are somewhat more numerous on apicolateral portions ( Figs. 13-14, 16-17 View Figures 10-17 ). Parameres (pa) symmetrical ( Figs. 14, 16-17 View Figures 10-17 ), rod-like in shape, somewhat curved ( Fig. 18 View Figures 18-20 ); apices rounded, somewhat thickened, mostly blackish; glabrous in basal two-thirds and with long, stout, dark setae in apical third ( Figs. 16-18 View Figures 10-17 View Figures 18-20 ); those setae at apicomedial margins even longer ( Fig. 18 View Figures 18-20 ). Phallus elongated; articulatory apparatus with long and narrow basal plate arms (bpa); basal plate bridge (bpb) narrow, shorter than basal plate arms; pedicel (pd) moderately short, slightly converging towards apex, sclerotized ( Figs. 19-24 View Figures 18-20 View Figures 21-22 View Figures 23-28 ). Dorsal phallothecal sclerite (dps) triangular in shape, sclerotized, with lateral margins thickened and covered by numerous thin sclerotizations, acute apically ( Figs. 22 View Figures 21-22 , 25 View Figures 23-28 ); struts (st) with curved lateral arms and subparallel somewhat curved median arms basally, all of them becoming completely fused and enlarged at approximately distal two-thirds, tapering apically, forming a very conspicuous arrow shaped structure ( Figs. 22 View Figures 21-22 , 25 View Figures 23-28 ). Endosoma wall smooth on basal half, becoming progressively more densely, minutely, spiny towards apex, with a subapical pair of prominent spiny subrounded to subtriangular lobes (sa) ( Figs. 19-22 View Figures 18-20 View Figures 21-22 , 26-29, 33 View Figures 23-28 View Figures 29-33 ), The following endosomal processes were observed: - a larger U-shaped basal process (u) formed by diffuse thickening and distal double curved elongated arms (ca) ( Figs. 19 View Figures 18-20 , 21-22 View Figures 21-22 , 26-28 View Figures 23-28 ); - a median subhemispherical process (m), situated between the lateral arms of the U-shaped basal process, formed by a dense grouping of small thickenings ( Figs. 19 View Figures 18-20 , 21-22 View Figures 21-22 , 26-28 View Figures 23-28 ); - A pair of elongate, parallel, flat, median and weakly sclerotized processes (fp), wrapped in large smooth thin portion of endosoma wall (with fine longitudinal grooves) ( Figs. 19 View Figures 18-20 , 21-22 View Figures 21-22 , 29-31 View Figures 29-33 ), continuous with a larger lateral portion of endosoma (lp) ( Figs. 19-22 View Figures 18-20 View Figures 21-22 , 29-30, 32 View Figures 29-33 ). The basal portion of these processes (fp) and the lateral portions (lp) lie apically in relation to the phallus and is connected largely basally by endosoma wall to the phallosoma ( Figs. 19-20 View Figures 18-20 ), forming a basal connection (bc) ( Figs. 20 View Figures 18-20 , 29 View Figures 29-33 ) and apically by a large thin membrane to the ventral portion of dorsal phallothecal sclerite, named here as a distal connection (dc) ( Figs. 19-20 View Figures 18-20 , 29 View Figures 29-33 ). When the latter connecting membrane is ruptured to achieve a complete expansion of the phallus, the set of flat processes (fp) and the lateral portion of endosoma (lp) was positioned near the subapical portion of phallus, partially connected to it ( Figs. 29-30 View Figures 29-33 ), or remained connected at median portion of the phallosoma as separated structures ( Figs. 21-22 View Figures 21-22 , 28 View Figures 23-28 , 31-32 View Figures 29-33 ).

Female. ( Figs 34-43 View Figures 34-35 View Figures 36-39 View Figures 40-43 ). Measurements are given in Tab. 2. Similar to male, with the same general coloration or in some specimens with some variation such as: neck sometimes variably paler, dark reddish to bright reddish ( Fig. 36 View Figures 36-39 ); reddish tones on coloration variably and ill defined on fore lobe of pronotoum, pleura, sterna and ventral portion of coxae ( Fig. 36 View Figures 36-39 ); disc of scutellum and/or apex variably paler, reddish brown in some specimens. Fore femora completely blackish in one individual, their dorsal surface faintly paler on a submedian narrow basal marking and on distal dorsal portion in four paratypes, almost completely faintly paler in one paratype and in other paratype, pale dorsal portion of femur is brighter. In the latter paratype, the hind femur has an additional smaller and faint yellowish annulus, betweeen the base of the segment and the median annulus ( Fig. 39 View Figures 36-39 ). While the larger annulus, located at median position, was approximately 1/6 as long as the segment, the additional faint basal annuli, measured approximately 1/16 as long as the segment and located somewhat closer to the median annulli than to the base of the femur ( Fig. 39 View Figures 36-39 ). First flagellomere not thickened in basal half. External genitalia ( Figs. 42-43 View Figures 40-43 ): blackish; tergite 9 with very long, sparse, strong blackish setae; paired gonoplac (g) and posterior margin of first gonapophysis (fg) with strong shorter setae.

Distribution. Brazil, in states of Minas Gerais and Rio de Janeiro.

la pared del endosoma. Comments. Because two previous mistakes involving the taxonomy of species of Neotropical Harpactorini with similar general aposematic coloration, i.e., 1 - the description of Reduvius coleopteroides Walker, 1873 , in spite that it had already been described before as Graptocleptes bicolor (Burmeister, 1838) and, 2 – the unjustified transference of R. coleopteroides to Hiranetis in a new combination, H. coleopteroides by Distant (1903), resulted in the fact that further authors wrongly identified an undescribed species of Hiranetis as H. coleopteroides (e.g., Figs. 2-5 View Figures 1-5 ). Gil-Santana et al. (2013) clarified the actual status of H. coleopteroides by showing that it is in fact a junior synonym of Graptocleptes bicolor (Burmeister, 1838) . After all, this species of Hiranetis is finally described as H. vanderheydeni sp. nov. here.

The slight variation in color recorded among the specimens of H. vanderheydeni sp. nov. studied here is considered as intra-specific variability. It is in accordance with the intraspecific variation in color, occasionally at extreme range, previously documented in many harpactorines (e.g., Stål 1872; Champion 1899; Gil-Santana 2008, 2022; Zhang et al. 2016), including in some wasp-mimicking Harpactorini ( Champion 1899; Gil-Santana et al. 2013, 2017; Gil-Santana and Oliveira 2023). On the other hand, about this subject, although females showed more examples of such differences, it is quite probably that it was recorded on them because more females were examined and not due to sexual dimorphism in coloration. Although the first flagellomere of the males have showed to be slightly thicker than those of the females ( Tab. 1), the difference is not remarkable as recorded in other harpactorines and may remain unnoticed because of the small difference between both sexes, while the eyes did not show differences between male and females. The few males were slightly smaller than the females ( Tabs. 1, 2), while the antennal pedicel was longer in the females ( Tabs. 1, 2); some of the females showed larger abdomens, which is common in females in general. In regard to vestiture, no differences were noted too. However, more specimens are in need to be examined in the future to ascertain if the few differences commented above are due to sexual dimorphism or interindividual variation.

Therefore, size of eyes, and thickness of the first flagellomere were not clear-cut enough to be considered as sexually dimorphic in H. vanderheydeni sp. nov. Despite the small number of measurements obtained for males ( Tab. 1), it seemed enough to state that, unlike many other Harpactorini , adults of H. vanderheydeni sp. nov. can not be sexed readily with the naked eye, by observing these two traits.

The wax-like substance was sometimes absent from portions where it was observed on other specimens (e.g., Figs. 40-41 View Figures 40-43 ). It may be lost during the manipulation of the individuals, which may also include loss of the thin fragile short pale setae associated with it ( Gil-Santana et al. 2017; Gil-Santana and Oliveira 2023). Body parts covered with patches of setae with whitish wax-like material have been registered by several authors in some Harpactorini species, as summarized by Gil-Santana et al. (2017) and Gil-Santana and Oliveira (2023). It is noteworthy that the wax-like substance or the fragile white groupings of setae may be absent when specimens are examined and described, and thus the extent of their existence may remain unknown ( Gil-Santana et al. 2017). Similarly, records of the presence or absence of these elements (groupings of whitish short setae and/or white wax), separately or together, may reveal as being additional features of systematic or taxonomic importance, in the same way as suggested for the “extensive sericeous areas on the abdominal sterna” of Heza ventralis Stål, 1872 ( Maldonado 1976). Therefore, as stressed by Gil-Santana et al. (2017), future studies on Harpactorini should include careful handling of the specimens after collection, to avoid unintentional removal of these elements from their bodies. It is also recommended that this information should be included in the records and/or descriptions whenever present.

The male genitalia of H. vanderheydeni sp. nov. ( Figs. 13-33 View Figures 10-17 View Figures 18-20 View Figures 21-22 View Figures 23-28 View Figures 29-33 ) showed similarities to those of G. bicolor ( Gil-Santana et al. 2013) , H. atra ( Gil-Santana 2016) , P. salgadoi ( Gil-Santana et al. 2017) and, Q. maracristinae ( Gil-Santana and Oliveira 2023) , such as: - parameres similar in shape and somewhat similar in vestiture ( Figs. 13-18 View Figures 10-17 View Figures 18-20 ); - pedicel (pd) (= basal plate extension) short ( Figs. 19-24 View Figures 18-20 View Figures 21-22 View Figures 23-28 ); - struts with subparallel median arms and curved basal lateral arms ( Figs. 22 View Figures 21-22 , 25 View Figures 23-28 ), although with different shapes in each species; - a pair of elongate, parallel, flat, weakly sclerotized endosomal processes (fp) ( Figs. 19 View Figures 18-20 , 21-22 View Figures 21-22 , 29-31 View Figures 29-33 ), although with different locations and shapes in each of these species. It is noteworthy that in most cited species such processes were recorded in the same position of the phallus, while in G. bicolor these processes were also recorded in different positions among diverse specimens; - a basal U-shaped and a median subspherical endosomal processes ( Figs. 19 View Figures 18-20 , 21-22 View Figures 21-22 , 26-28 View Figures 23-28 ) were recorded in H. atra , P. salgadoi and Q. maracristinae . In all these species, however, the distal double curved elongated arms of the former process, as recorded in H. vanderheydeni sp. nov. ( Figs. 22 View Figures 21-22 , 27-28 View Figures 23-28 ), were not present. Yet, variable, different, or not well evident spiny lobes or portions of endosoma wall were recorded in each of these species, making their comparison difficult. The apex of the pygophore is subtriangular in shape in G. bicolor and H. atra , and enlarged and arrow-shaped, with the lateral margins acutely pointed in P. salgadoi and Q. maracristinae , while in H. vanderheydeni sp. nov. is quite diverse, since the posterior margin is almost straight, slightly curved laterally, with a globose and subhemispherical median portion and lateral angles prominently acute and slightly curved ( Figs. 14, 16, 17 View Figures 10-17 ). The most remarkable differences, however, were found among the general shape and peculiarities of the dorsal phallothecal sclerite ( Figs. 19-22 View Figures 18-20 View Figures 21-22 , 25 View Figures 23-28 ), which were quite different in all species ( Gil-Santana et al. 2013, 2017; Gil-Santana 2016; Gil-Santana and Oliveira 2023).

Thus, in agreement with previous studies ( Elkins 1954a, b; Hart 1975, 1986, 1987; Zhang et al. 2016), the features of the male genitalia of H. vanderheydeni sp. nov. that should especially be taken into consideration for comparative purposes are the shape of apex of the pygophore ( Figs. 14, 16, 17 View Figures 10-17 ) and the features of the dorsal phallothecal sclerite ( Figs. 22 View Figures 21-22 , 25 View Figures 23-28 ).

A female of H. vanderheydeni sp. nov. from Nova Friburgo municipality was found to have an egg of Phasiinae ( Diptera : Tachinidae ) on latero-distal portion of distal sternites ( Fig. 41 View Figures 40-43 ). This record is similar to the observation of the finding of similar eggs on the bodies of other species of Harpactorinae species of the same municipality, one of which proven to be associated to the parasitoidism by a female of Xanthomelanodes cf. brasiliensis ( Gil-Santana and Forero 2010; Gil-Santana and Dios 2023). Therefore, future observations may clarify if H. vanderheydeni sp. nov. is another host of Phasiinae ( Tachinidae ) in Neotropical region.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Reduviidae

Genus

Hiranetis

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