.
Scarabaeoidea of Southern South America Links |
| |
|
|
|
| |
| .. |
Scarab Guide Links
(goes to the University of Nebraska
web site) |
.
Classification |
|
|
| ...... |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| ... |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| .. |
| ... |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| . |
| ........... |
|
|
| . |
.
Brachysternus marginatus Germain, 1905
Brachysternus marginatus Germain 1905:485-487. |
| |
| |
|
Figure 30a-c. Form of the male genitalia in Brachysternus marginatus (lateral view of
parameres and apex of phallobase, caudal view of parameres, and ventral view of ventral
and
lateral sclerites). |
| |
|
Map showing the distribution of B. marginatus. |
|
| |
...... |
|
Description. Length: 16.5-18.4 mm. Width: 7.8-8.8 mm at base of elytra. Color:
Dorsally shiny apple green, elytral margins metallic brassy-green; clypeal apex of female
tan with metallic green shine (entirely metallic green in male); pronotal margins tan with
metallic green shine; femora, tibiae, and sternites shiny testaceous; pygidium shiny testaceous
with metallic green shine; propygidium and tergites shiny brown. Head: Clypeal
apex rectangular with broadly rounded corners, not constricted at base; margins moderately
reflexed, apex broadly reflexed (male) or weakly reflexed only at tip (female).
Frons moderately densely punctate (disc and base) to densely punctate (apex and sides);
punctures moderate in size, some setose; setae hair-like laterally (sparse, moderately long,
tawny), thickened posterior to eye (sparse, moderately long, white). Clypeus of male
densely punctate (base) to rugopunctate (mid-disc to apex), rugopunctate in female; punctures
moderately large. Interocular width 4.3-5.2 transverse eye diameters. Terminal
segment of maxillary palpus (dorsally) weakly impressed from base to about middle,
segment subequal in length to segments 2-3. Antennal club subequal in length to segments
1-7 (male) or subequal to segments 2-7 (female). Pronotum: Surface with moderately
impressed, median, longitudinal groove, disc with small punctures (moderately
dense), margins and lateral apex with a field of moderately-sized punctures (moderately
dense), with few setae; setae hair-like and thickened, moderately long and long, tawny,
sparse. Basal bead complete to near middle. Elytron: Surface with 5 weakly impressed,
poorly defined, punctate, longitudinal striae between suture and humerus; punctures small
(moderately dense), some at margins and apex moderate in size, some setose; setae hairlike
or thickened, moderately long and long (mixed), sparse, white. Intervals with similar
sculpturing. Humeral and apical umbone poorly developed. Epipleuron expanded from
metacoxa to sternite 2, marginal bead lacking; region from metacoxa to apex
with 0-10 setae; setae thickened, short, white. Sutural angle square. Propygidium: Posterior
margin with fringe of setae; setae thickened, short, white. Supraspiracular ridge
well-developed. Pygidium: Male: disc, margins, and apex with hair-like and thickened
setae (moderately long and long (mixed), moderately dense to dense, tawny and white)
and punctures (small, moderately dense to dense). Female: disc weakly impressed (not
bituberculate), punctate at apex (moderately dense) and at margins (moderately dense to
dense); punctures small and moderate, setose; setae hair-like and thickened, tawny, moderately
long and long (mixed), moderately dense to dense. Venter: Sternum setose; densely
clothed with white, long, hair-like setae; sternites densely clothed with thickened and
hair-like, white, moderately long setae (less dense in female). Prosternal keel broadly
triangular; apex projecting anteriorly at about 458 with respect to ventral plane; apex
produced to mid-protrochanter, apex blunt. Apex of terminal sternite in female deeply emarginated at middle. Legs: Larger claws of male thickened and weakly
bifurcate at subapex. Larger claws of female with a ventral tooth. Tarsomere 5 with well
developed ventromedial tooth, apex acute. Metatibia with inner edge weakly bowed
inwardly, outer edge straight, with 2 weak carinae; 1 at basal third (poorly developed),
1 at apical third (moderately developed), carinae more developed in females; apical 1/5
weakly divergent (more so in females). Male genitalia: Figure 30a-c. |
| |
|
|
Diagnosis. Brachysternus marginatus is easily separated from other species
of Brachysternus by the expanded elytral epipleuron (not expanded
in other species of Brachysternus); the pronotal disc with small, sparse punctures
(in other species of Brachysternus the punctures of the pronotal disc are
moderately large or large and moderately dense or dense); broadly reflexed
clypeal apex in the male (shared with B. patagoniensis); the form of the male
genitalia (Fig. 30a-c); and the metatibia with inner edge weakly bowed inwardly,
outer edge straight (in B. patagoniensis, the metatibia is bowed inwardly
on the inner edge and the outer edge is bowed outwardly; in other
species of Brachysternus, the metatibia is not bowed). |
| |
|
|
Distribution (see map). Recorded from about 1,100 m elevation from Linares
to Cautín, Chile. |
| . |
|
| |
Locality Data. 22 specimens examined from BCRC, CMNC, FMNH,
MGFT, MNNC, SEMC, VMDM.
CHILE (20). CAUTIN (1): Pucará, Villarrica. LINARES (3): Parral, San
Pablo. MALLECO (15): Lonquimay, Manzanar, Manzanar (9.2 km E). NUBLE
(1): Recinto.
NO DATA (2). |
| |
|
| |
Temporal Data. January (1), October (1), November (4), December (14). |
| |
|
| |
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. |
| |
|
