Brachystethustricolor, Bolívar, 1879

Barcellos, Aline & Grazia, Jocélia, 2003, Revision Of Brachystethus (Heteroptera, Pentatomidae, Edessinae), Iheringia, Sér. Zool. 93 (4), pp. 413-446: 429-431

publication ID

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

DOI

http://doi.org/10.5281/zenodo.3719833

persistent identifier

http://treatment.plazi.org/id/217887A7-991D-8023-4BE3-5EFCFD546630

treatment provided by

Tatiana

scientific name

Brachystethustricolor
status

 

Brachystethustricolor   Bolívar, 1879

( Figs. 8 View Figs , 18, 28 View Figs , 38 View Figs , 48 View Figs , 59 View Figs )

Brachystethustricolor   BOLÍVAR, 1879:138; LETHIERRY & SEVERIN, 1893:187 (cat.); KIRKALDY, 1909:152 (cat.); FROESCHNER, 1981:69 (cat.).

Typematerial. Lectotype, heredesignated, labeled: a) Baeza ( Ecuador), 4/mar - 20/abr/1865, F. Martinez; b) Expedición al Pacífico (1862-1865); c) M.N.C.N., Madrid; d) Brachystethustricolor Bol.   ?; e) sintipo? ( MNCS)   ; paralectotypes ,, both labeled: a) Martinez Baeza / 481; b) Baeza ( Ecuador), 4/mar - 20/abr/1865, F. Martinez; c) Expedición al Pacífico (1862-1865); d) M.N.C.N., Madrid; e) Brachystethustricolor Bol.   ?; f) sintipo? ( MNCS).   Typelocality: Baeza, Ecuador. (“Baeza Americae Equatorialis”).

Description. Dorsal surface black, except corium and, in some specimens, part of pronotum, reddish (fig.8). Head entirely black, with conspicuous wrinkles. Mediumsized punctures moderate to sparsely distributed. Antennae black; fourth antennal segment cylindrical. Second antennal segment slightly longer than first and about 3/4 as long as third; third slightly morethan half of fourth; fifth the longest, a little less than one and a half as long as fourth. Pronotum entirely black, or, in some specimens, with about basal 2/3 reddish. Anterolateral margins entirely black or with a thin subcaloused, yellowish border. Medium-sized punctures concentrated before cicatrices. Some specimens with verycoarse punctures on basal 2/3, decreasing in size posterad. Scutellum black, sometimes slightly reddish in the middle. Coarse punctures, in variable density, decreasing in size toward apex. Remaining punctures medium-sized to fine, distributed allover surfaceof scutellum. Corium reddish, except along costal margins, with a narrow black stripe variable in length, and a little black spot, irregular-shaped, entad to apex of radial vein. Yellowishcallus nearand entad apex of radial vein, lackingin some specimens. Costal margins, in some specimens, with a thin, subcalousedyellowish border, evanescent posterad. Ventral surface of thorax black, sometimes reddish-castaneous on propleura and near coxae. Punctures concolor. Ostiolar rugae short, extending by about 1/3 of distance between inner margin of ostiolum and lateralmargin of metapleura. Metasternum, in profile, little elevated anteriorly; transversal sulcus in the middle. Legs black, coxae reddish-castaneous. Connexivum mostly black; in some specimens, a reddish stripe of variable width along inner margin. Venter red, with rounded black spots around each spiracle and one black continuous stripe along lateral margins, variable in width, occupying one fourth to half the distance between spiracles and lateral margin of abdomen. Some specimens present, on sternites III to VI, entad to spiracles, elliptical black spots, variable in size. Anterior and posterior margins of sternites occasionally with blackish stripes. Punctures sparse, fine and concolor with venter, more concentrated over black spots entad to spiracles. Spiracles black.

Male genitalia. Pygophore quadrangular, equally wide at apex and base. Lobes of dorsal rim conspicuous, strongly projected posterad, rounded at apex. Genital cup processes little visibledorsally ( figs. 18, 28). Parameres with acute apex, turned toward tenth segment ( fig. 48). Ventral rim not so openly V-like as in other speciesof the genus (fig. 38).

Measurements (n=4). Headlength 1.80 (1.72-1.87) ± 0.06, width 2.71 (2.61-2.77) ± 0.07; interoculardistance 1.46 (1.37-1.56) ± 0.08; anteocularlength 0.60 (0.56-0.62) ± 0.03; lengthof antennalsegments: I - 0.97 (0.94-1.01) ± 0.03; II - 1.12 (1.05-1.20) ± 0.06; III - 1.44 (1.25-1.56) ± 0.14; IV - 2.53 (2.50-2.56) ± 0.03; V - 3.44 (3.39-3.48) ± 0.06; pronotal length 3.86 (3.34-4.09) ± 0.35, width 9.14 (8.52-9.69) ± 0.50; scutellarlength 5.95 (5.52-6.35) ± 0.41, width 5.72 (5.36-6.01) ± 0.28; coriumlength 8.64 (8.52-8.77) ± 0.18; abdominalwidth 10.23 (9.69-10.69) ± 0.46; totallength 14.15 (13.53-14.86) ± 0.55.

Female genitalia. Posterior borders of gonocoxites 8 in an obtuse angle near limit between laterotergites 9 and gonocoxites 9. Sutural borders of gonocoxites 8 parallel and contiguous, except at apex ( fig. 59).

Measurements (n=1). Headlength 1.87, width 2.89; interoculardistance 1.56; anteocularlength 0.62; lengthof antennalsegments: I - 1.17; II - 1.29; III - 1.40; IV - 2.77; V - 3.59; pronotallength 3.84, width 9.69; scutellarlength 6.24, width 6.00; coriumlength, not measured; abdominalwidth 11.19; totallength 15.20.

Material examined. ECUADOR,, “71”, E. de Ville col., “Coll. R.I. Sc. N.B.” ( DARC)   .

PERU, Ucayali: Aguaytía (295m, low jungle),, 13.IX.1946, F. Woytkowski ( USNM)   ; Huánuco: Chinchao ( 25 Km below Carpish , 2500m),, 13.IX.1946, F. Woitkowski ( AMNH)   .

Distribution. Ecuador, Peru (Ucayali, Huánuco).

Comments. Brachystethus tricolor   is the sister species of B. vexillum   , with which shares two synapomorphies and one homoplasy, respectively: venter predominantly red, metasternal carina transversely sulcated and ostiolar rugae short ( BARCELLOS & GRAZIA, 2003). These characters also separate both species from theremaining species of the genus. Brachystethus tricolor   can be distinguished from B. vexillum   by dorsal color with red spots, and quadrangular shape of pygophore.

MNCS

MNCS

USNM

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

AMNH

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

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Pentatomidae

Genus

Brachystethus

Loc

Brachystethustricolor

Barcellos, Aline & Grazia, Jocélia 2003
2003
Loc

Brachystethustricolor

FROESCHNER 1981: 69
KIRKALDY 1909: 152
LETHIERRY & SEVERIN 1893: 187
BOLÍVAR 1879: 138
1879