Dysmerus impolitus Thomas
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|Dysmerus impolitus Thomas|
Dysmerus impolitus Thomas , new species
Diagnosis. Individuals can be distinguished from other members of the genus by a combination of the following character states: head with short median carina ( Fig. 13 View Figure 13-15 ); integument dull, strongly microreticulate; inconspicuous dorsal pubescence, and in the male, scape simple, strongly curved ( Fig. 13 View Figure 13-15 ).
Description. Holotype, male, in NMPC, with label data as follows: “REPRESSA RIO GRANDE, GB BRASIL, 6.66 ALVARENGA”/”coll. Marek P5p-05/74”.
Body elongate, parallel-sided, convex; length, 1.76 mm.
Head 2.00X wider than long; punctures shallowly impressed, longitudinally elliptical, smaller than an eye facet, separated by 1-2 or more puncture diameters, sparse medially, denser laterally and basally; each subtending a short, pale seta; surface between punctures dull, microreticulate; a short median longitudinal carina begins just posterior to the antennal insertions and ends at about the midpoint of the eye; clypeus prolonged, comprising 0.26 of total length of head measured along midline from front of eyes to front of head capsule, shallowly emarginate, sides not reflexed; angle above antennal insertion obtuse, strongly elevated; antennal scape large, length equal to 0.60 length of head; from dorsal view strongly curved medially, apical portion of scape flattened laterally and distally rounded ( Fig. 13 View Figure 13-15 ), dorsally without a dark tubercle; pedicel small, quadrate; antennomeres III-VIII quadrate, about equal in length; antennomeres IX-X broader and longer; XI longer than X; eye moderately, evenly convex, about 0.42 length of head.
Pronotum slightly wider than long (1.09:1.00); surface sculpture and pubescence as head; roughly rectangular in shape, broadest just behind apex, thence narrowing slightly to base; width across anterior angles 1.05X width across posterior angles; sides steeply descending from sublateral line to margin; anterior angles right, not produced; posterior angles right, not produced.
Elytra 2.04X longer than combined width; parallel-sided for basal half, then gradually converging; lateral margin of third cell slightly more prominent than others but scarcely carinate; sides laterally perpendicular to margin.
Male genitalia as in Fig. 37 View Figure 35-37 .
Female, allotype, in NMPC, length, 1.86 mm., with label data as follows: “REPRESSA RIO GRANDE, GB BRASIL, 8.66 ALVARENGA”/”coll. Marek P 5p-05/74”. Proportions as follow: head, 2.23X wider than long ; clypeus 0.28 length of head; eye, 0.67 length of head; pronotum as wide as long, 1.09X as wide apically as posteriorly; elytra 2.07X longer than wide. All else as in male except for the simple scape .
Type material. Paratypes, 44 as follows: 1,
“ BRAZIL: Rondonia, 62km SW Ariquemes, nr Fzda.
Rancho Grande 27-1V-1992 U. Schmitz blacklight
trap” ( FSCA); 2, “ BRAZIL: State of Minas Gerais ,
Cordisburgo Gruta de Maquine 20-I-1979 R.E.
Woodruff blacklight trap” ( FSCA); (the following
each has a second label reading: “coll. Marek P5p-
05/74") 1, “REPRESSA RIO GRANDE, GB
BRASIL, 5.66 AVARENGA” ( FSCA, NMPC); 2, “R.
Janeiro GB, Brasil 3.72 Alvarenga” ( NMPC); 7,
“REPRESSA RIO GRANDE, GB BRASIL, 8.66
ALVARENGA” ( NMPC); 7, “REPRESSA RIO
GRANDE, GB BRASIL, 6.66 ALVARENGA”
( FSCA, NMPC); 18, “RIO D. JANEIRO GB BRAS.,
7.66 ALVARENGA” ( DEFS, FSCA, NMPC); 1,
“REPRESSA RIO GRANDE, GB BRASIL, 6.67
OLIVEIRA” ( FSCA); 1, “FZDR. TIJUCA
GUANABARA ALVARENGA 5.66" ( NMPC); 2,
“REPRESSA RIO GRANDE, GB BRASIL, 10.67 Figure 41-42. Male genitalia of species of Dysmerus : 41) OLIVEIRA” ( NMPC); 4, “REPRESSA RIO D. sulcicollis (Grouvelle) ; 42) D. symphilus Thomas , n. sp. GRANDE, GB BRASIL, 9.72 OLIVEIRA” ( DEFS,
Variation. The paratypes range in length from 1.34 mm to 1.88 mm. Otherwise, they are very similar to the holotype.
Etymology. The specific epithet refers to the non-glossy integument of this species,
Distribution. Brazil, Paraguay (Map 4).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.