Brachystethus rubromaculatus, Dallas, 1851

Barcellos, Aline & Grazia, Jocélia, 2003, Revision Of Brachystethus (Heteroptera, Pentatomidae, Edessinae), Iheringia, Sér. Zool. 93 (4), pp. 413-446: 421-424

publication ID

http://doi.org/ 10.1590/S0073-47212003000400008

DOI

http://doi.org/10.5281/zenodo.3719821

persistent identifier

http://treatment.plazi.org/id/217887A7-9905-803A-4ABB-5ADEFCB86659

treatment provided by

Tatiana

scientific name

Brachystethus rubromaculatus
status

 

Comments. Brachystethus rubromaculatus   is the sister group of the clade formed by B. signoreti   , B. cribrus   and B. schuhi   , sharing with these species the fourth antennal segment medially swollen, the metasternal carina strongly elevated anteriorly and the little projected lobes of dorsal rim of pygophore ( BARCELLOS & GRAZIA, 2003). It can be easily distinguished by the most frequent color pattern, dorsally black, with rounded red spots and venter black, with 1 + 1 spots extending from the anterior margin of fourth sternite until anterior margin of seventh. However, in specimens in which the red spots are coalescent, B. rubromaculatus   can be confounded with B. signoreti   , but easily distinguished by the color pattern of legs, uniformly black, the finer punctuation of scutellum and by genitalia, especially the size of parameres in relation to X segment. Legs uniformly black also distinguish B. rubromaculatus   from B. cribrus   and B. schuhi   . Brachystethus signoreti Stål, 1872  

( Figs. 4, 5 View Figs , 15, 25 View Figs , 35 View Figs , 45 View Figs , 57 View Figs , 67 View Figs )

Brachystethus geniculatus   SIGNORET, 1851:345 (preoccupied, not Fabricius, 1787); WALKER, 1868:455.

Brachystethus signoretii   STÅL, 1872:48 (new name); KIRKALDY, 1909:152 (cat.); GRAZIA, 1984:74.

Brachystethus signoreti   ; LETHIERRY & SEVERIN, 1893:187 (cat.).

Typematerial. Lectotype, heredesignated, labeled: a) Laguaira, Coll. Signoret; b) geniculat. det. Signoret ( NHMW); paralectotype, heredesignated, labeled: a) Laguaira, Coll. Signoret; b) geniculata   det. Signoret ( NHMW). Typelocality, Venezuela (“ LaGuaira ”)   .

Description. Dorsal surface dark- to reddish-castaneous ( figs. 4, 5). Head dark- to reddish-castaneous, with conspicuous wrinkles. Punctures of median stripe sparse; semicircular stripes moderately punctured. Antennae black; fourth antennal segment medially swollen, with a longitudinal sulcus. Second antennal segment about one and a half as long as first, third about one and a quarter the second, fourth almost twice the third and fifth slightly longer than fourth. Pronotum dark- to reddish-castaneous. Punctures fine regularly distributed, interposed with coarse punctures, more concentrated behind cicatrices; medium-sized punctures densely distributed before cicatrices. Scutellum concolor with pronotum; coarse punctures distributed on basal 3/4, among them, fine punctures, denserlaterally. Coriumwithout callus, dark- to reddish-castaneous; on the reddish-castaneous specimens, present two darker, grayish stripes, along outer margin and entad to radial vein. Ventral surface of thorax with black, medium-sized punctures. Ostiolar rugae extendingby 2/3 of distance between inner margin of ostiolum and lateral margin of metapleura. Metasternum, in profile, strongly elevated anteriorly. Legs dark-castaneous to black, yellowish at apexof femora and baseof tibiae. Connexival segments dark- to reddish-castaneous. Venter dark- to reddish-castaneous, in this case with reddish areas around and entadto spiracles andlittle less conspicuous sub-medially. Punctures fine, concolor, regularly distributed, but rare on medial fifth of abdomen. Spiracles black.

Male genitalia. Pygophore trapezoidal, wider apically. Lobesof dorsal rim conspicuous, little projected posterad, rounded at apex. Genital cup processes moderately visible dorsally ( figs. 15, 25). Parameres very wide apically; apexantero-laterad directed, slightly longerthan mediallengthof tenthsegment ( fig. 45). Ventralrimopenly U-shaped ( fig. 35).

Measurements (n=10). Headlength 1.93 (1.84-2.04) ± 0.06, width 2.95 (2.88-3.12) ± 0.09; interoculardistance 1.55 (1.44-1.6) ± 0.06; anteocularlength 0.66 (0.60-0.72) ± 0.05; lengthof antennalsegments: I - 0.82 (0.80-0.88) ± 0.03; II - 1.22 (1.08-1.4) ± 0.08; III - 1.51 (1.24-1.68) ± 0.15; IV - 2.93 (2.72-3.2) ± 0.17; V- 3.35 (3.28-3.44) ± 0.07; pronotallength 4.23 (4.01-4.51) ± 0.18, width 9.44 (8.85-10.10) ± 0.39; scutellarlength 6.42 (6.01-6.93) ± 0.31, width 6.01 (5.68-6.35) ± 0.22; coriumlength 9.19 (8.85-9.69) ± 0.30; abdominalwidth 10.55 (10.02-11.02) ± 0.35; totallength 14.35 (13.78-15.03) ± 0.46.

Female genitalia. Posterior borders of gonocoxites 8 convex over laterotergites 9. Sutural borders of gonocoxites 8 parallel and contiguous, except at apex ( fig. 57). Gonocoxites 9 almost three and a half times wider across arms apices than long medially; anterior border broadly U-shaped. Length of arms equalto 1/6 of plate width. Thickening of vaginal intima digitiform. Ductus receptaculi thickafter vesiculararea, and about one and a half longer before than after this area. Capsula seminalis   elongated, digitiform. Annular crestsparallel ( fig. 67).

Measurements (n=10). Headlength 2.09 (1.92-2.28) ± 0.12, width 3.11 (3.04-3.20) ± 0.06; interoculardistance 1.61 (1.52-1.68) ± 0.06; anteocularlength 0.70 (0.60-0.80) ± 0.06; lengthof antennalsegments: I - 0.94 (0.84-1.12) ± 0.08; II - 1.40 (1.28-1.52) ± 0.08; III - 1.68 (1.36-1.84) ± 0.15; IV - 3.18 (2.76-3.36) ± 0.18; V - 3.62 (3.56-3.68) ± 0.08; pronotallength 4.72 (4.51-5.01) ± 0.14, width 10.60 (10.19-11.02) ± 0.25; scutellarlength 7.18 (6.93-7.35) ± 0.13, width 6.75 (6.51-7.01) ± 0.20; coriumlength 10.27 (9.94-10.69) ± 0.22; abdominal width 11.87 (11.44-12.36) ± 0.28; totallength 16.30 (15.53-17.20) ± 0.56.

Material examined. VENEZUELA,, pres. by Perth Museum ( BMNH 1953-629)   ;, Schauf. col., Coll. Mayr ( NHMW)   ; San Julian, 2, VII.1900, W. Robinson Bequest ( USNM 1929)   ; Rancho Grande , 3, 2, 19,26,27. IV.1945 ( AMNH)   ; Aragua: Villa de Cura (Est. Exp. Cataurito, (± 1000m),, 27.X.81, J.L. Garcia ( IZAV)   ; Maracay (450m, en luz), 2, 22.V.1963, E. Osuna ( AMNH, IZAV)   ; Mérida: Mérida, 4, 3 ( AMNH)   ; Tachira: San Cristobal (River Black),, 7.III.1980, Miguel G. ( IZAV)   ;, 5.I.1982, Gaban ( IZAV)   ; (Colon)   ,, 1.IV.1982, Gaban ( IZAV)   ;, 10.X.1981, Ramirez ( IZAV)   . ECUADOR, Pichincha: Santo Domingo de los Colorados (amazonian rainforest),,, X.1981, G. Onore ( BMNH 1982-246);   La Union , 2,, 12.VII.1984, R. Haswell ( DARC)   ; Cotopaxi: (1500 m, tropical rainforest general collecting),, X.1982, G. Onore, ( BMNH, 1982-246);   Paramba ,, “ Coll. I.R. Sc. N.B. ” ( DARC)   ; 4, Rosemberg col. ( USNM)   ; (3500’, dry season),, II.97, Rosenberg ( BMNH)   ; Balrahamba ,, F. Campos ( USNM)   ;, 18.V.1935, F. Campos; J.C. Lutz Collection ( USNM 1961)   ; Pastaza: Canelos ,, Schouteden ( DARC)   ; Tungurahua: Ambato ,, 2, Coll. Noualhier 1898 ( MNHN)   ;, E. de Ville & M.R.Belg col., Coll. Noualhier 1898 ( MNHN)   . No data: ( BMNH)   ;, Coll. Mayr ( NHMW)   .

Distribution. Venezuela (Aragua, Mérida, Tachira), Ecuador (Pichincha, Cotopaxi, Pastaza, Tungurahua).

Comments. Brachystethus signoreti   is the sister group of the clade composed by B. cribrus   and B. schuhi   , sharing the homoplastic character of color pattern of legs, apex of femoraand base of tibiae yellowish ( BARCELLOS & GRAZIA, 2003). Itcan bedistinguished from these species by the absence of calli on the corium and from B. cribrus   , especially, by the color of venter, lacking yellow spots. Brachystethus signoreti   is also close to B. rubromaculatus   , distinguished by the color pattern of legs, the coarser punctures of scutellum and, on male genitalia, especially by the larger parameres.

NHMW

Austria, Wien, Naturhistorisches Museum Wien

AMNH

USA, New York, New York, American Museum of Natural History

IZAV

Venezuela, Maracay, Museuo del Instituto de Zoologia Agricola

DARC

DARC

BMNH

United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]

USNM

USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]

MNHN

France, Paris, Museum National d'Histoire Naturelle

AMNH

American Museum of Natural History

USNM

Smithsonian Institution, National Museum of Natural History

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Pentatomidae

Genus

Brachystethus

Loc

Brachystethus rubromaculatus

Barcellos, Aline & Grazia, Jocélia 2003
2003
Loc

Brachystethus signoreti

LETHIERRY & SEVERIN 1893: 187
1893
Loc

Brachystethus signoretii

GRAZIA 1984: 74
KIRKALDY 1909: 152
STÅL 1872: 48
1872
Loc

Brachystethus geniculatus

WALKER 1868: 455
SIGNORET 1851: 345
Fabricius 1787: 422
1851