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Scarabaeoidea of Southern South America Links |
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Scarab Guide Links
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Classification |
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Brachysternus patagoniensis Jameson and Smith 2002
Brachysternus patagoniensis Jameson and Smith 2002: 348. |
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Figure 32a-c. Form of the male genitalia in Brachysternus patagoniensis (lateral view of
parameres and apex of phallobase, caudal view of parameres, and ventral view of ventral
and
lateral sclerites). |
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Map showing the distribution of B. angustus. |
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Holotype (male). Length: 19.2 mm. Width: 8.9 mm at base of elytra. Color: Dorsally
dark shiny apple green to olivaceous shiny green with bluish reflections, elytral margins
metallic brassy-green; clypeus castaneous with metallic green; femora, tibiae, sternites,
and pygidium shiny testaceous to castaneous, femora with weak green reflections; propygidium
castaneous and tergites shiny black. Head: Clypeal apex subovoid,
constricted weakly at base; margins and apex broadly reflexed. Frons moderately densely
punctate (disc) to densely punctate with some contiguous (base and sides); punctures
moderately large (disc) to large (base and sides), some setose; setae hair-like, (moderately
dense to dense, moderately long to long, testaceous), thickened posterior to eye (sparse,
moderately long, white). Clypeus densely punctate (base) to rugopunctate (mid-disc to
apex); punctures moderately large, some setose laterally; setae moderately long, hairlike,
sparse to moderately dense. Interocular width 5.0 transverse eye diameters. Terminal
segment of maxillary palpus (dorsally) weakly impressed from base to apical one-fourth,
segment subequal in length to segments 2-3. Antennal club slightly shorter than segments
1-7. Pronotum: Surface with moderately impressed, median, longitudinal groove;
disc with small and moderate punctures; punctures moderately dense; margins, apex, and
base with moderately large to large punctures; some punctures with hair-like, moderately
long and long (mixed), testaceous to tawny, moderately dense to dense setae. Basal bead
complete to near middle. Elytron: Surface with 5-6 weakly impressed, poorly defined,
punctate, longitudinal striae between suture and humerus; punctures moderate to small,
sparse (disc) and moderately dense (margins and apex), some setose; setae hair-like,
long, sparse, testaceous. Intervals with similar sculpturing. Humeral and apical umbone poorly developed. Epipleuron flat, not expanded, with marginal bead poorly developed
(from base to metacoxa or sternite 1) or lacking; region from metacoxa to apex setose;
setae hair-like, moderately long and long (mixed), dense, testaceous. Sutural angle
square. Propygidium: Posterior margin with fringe of setae; setae thickened, short or
moderately long, testaceous or white. Supraspiracular ridge well developed. Pygidium:
Surface with hair-like and thickened setae (mixed, moderately long and long, moderately dense to dense, testaceous) and punctures (small, moderately dense to dense, some vertically
confluent). Venter: Sternum setose; densely clothed with testaceous, long, hairlike
setae; sternites moderately densely clothed with thickened, tawny, moderately long
setae. Prosternal keel broadly triangular; apex projecting anteriorly at about 608 with
respect to ventral plane; apex produced to base of protrochanter, apex blunt. Mesometasternum
with apex rounded, not produced. Legs: Larger claws thickened and weakly
bifurcate at apex. Tarsomere 5 ventromedially swollen, without tooth. Metatibia
with inner edge slightly bowed inwardly, outer edge slightly bowed outwardly;
outer edge with 1 weak carina in the apical third. Male genitalia: Figure 32a-d. |
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Variation. The allotype and paratype specimens vary from the holotype in
the following respects. Length: 17.4-20.6 mm. Width: 7.9-8.9 mm (at base of
elytra). Color: Dorsally dark shiny apple green to olivaceous shiny green
(some other specimens tan) with or without bluish reflections; clypeus castaneous
with or without metallic green. Head: Clypeal margins and apex weakly
reflexed only at tip (females). Clypeus rugopunctate; punctures moderately
large, some setose laterally (females). Interocular width 5.0-6.1 transverse eye
diameters. Antennal club subequal in length to segments 2-7 (females) or
slightly longer than segments 1-7 (1 male). Pronotum: Surface with weakly
or moderately impressed, median, longitudinal groove. Elytron: Lateral margin
with setae moderately dense, moderately long (1 male). Pygidium: Disc in
female weakly impressed (not bituberculate), moderately densely punctate;
punctures small, some confluent vertically, some setose; setae hair-like or
thickened (scale-like in some specimens), tawny or white, moderately long and
long, moderately dense and dense. Apex at middle rounded (female). Surface
with setae white or testaceous (male). Venter: Sternum moderately densely or
densely clothed with tawny or testaceous, long, hair-like setae; sternites with
tawny or white setae (less dense in females). Apex of terminal sternite in
females moderately emarginated at middle. Legs: Metatibia of
female with inner edge slightly bowed inwardly, outer edge weakly divergent
in apical 1/5, with 1 weak carina in apical third. Female claws with ventral
tooth on larger claw. |
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Etymology. The specific epithet is taken from the latinized adjective meaning
‘‘Patagonian,'' referring to the region in which this species is found. The
suffix ‘‘-ensis'' denotes place or locality. |
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Diagnosis. Brachysternus patagoniensis is separated from other species of
Brachysternus by the form of the metatibia (inner and outer edges
in the male bowed, inner edge in the female bowed), the clypeus that is weakly
constricted at the base; the presence of dense, long, testaceous setae
on the lateral margin of the elytron and margins of the pronotum and head; the black or castaneous propygidium and sternites; and the form of
the ventral and lateral sclerites of the male genitalia (Fig. 32a-d).
One male specimen from San Pedro, Chile, differs from the all other specimens
in the type series due to its antennal club that is slightly longer than
segments 1 to 7 (subequal to segments 1 to 7 in other specimens) and the
setae on the elytral margin that are moderately dense and moderately long
(setae dense and long in other specimens). The remainder of characters are
consistent with other specimens of B. patagoniensis (bowed form of the metatibia,
constricted base of the clypeus, black sternites and propygidium, and
form of the ventral and lateral sclerites of the male genitalia). |
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Distribution (see map). Recorded from 450-1,400 m elevation from Malleco
to Aisén, Chile and nearby areas of western Argentina. |
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Locality Data. 41 specimens examined from CASC, CMNC, FMNH,
JMEC, MNNC, PVGH.
ARGENTINA (8). CHUBUT (2): Lago Fontana. NEUQUEN (6): Parque
Nacional Lanı´n, San Martín de los Andes.
CHILE (33). AISEN (1): Villa O'Higgins. CAUTIN (11): Volcán Villarrica.
CHILOE (1): San Pedro. MALLECO (12): Angol, Cerros de Nahuelbuta, Parque
Nacional Nahuelbuta (45 km W Angol). OSORNO (8): Antillanca. |
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Temporal Data. October (2), November (7), December (22), January (9). |
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Natural History. Brachysternus patagoniensis has been recorded from forests
composed of Nothofagus and Arucaria species; Nothofagus dombeyi (Blume),
Saxegothaea sp., and Drimys; and stunted Nothofagus pumilio Krasser.
Label data indicate that some specimens were captured using flight intercept
traps and as incidental captures in pitfall traps. |
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Excerpt from:
Jameson, M. L. and A. B. T. Smith. 2002. Revision of the South American genus Brachysternus Guérin-Ménville (Coleoptera: Ruteliinae: Anoplognathini: Brachysternina). Coleopterists Bulletin 56: 321-366. |
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