Diabrotica sedata Baly

Species name

Diabrotica sedata Baly 1890: 48

Type locality

Brazil

Type depository

BMNH, lectotype, male, verified

Diagnosis

Body length 7.4-7.7 mm. Body width 4.0-4.2 mm. Head basic color yellow. Antennae filiformfiliform:
slender antennae with antennomeres of similar shape
, bi- or tricolored, antennomereantennomere:
"segment" of antenna, more or less clearly separated
1 yellow, upper sides darkened, antennomeres 2-8 uniformly cinnamon brown, antennomeres 9-10 yellow, partly infuscated, antennomereantennomere:
"segment" of antenna, more or less clearly separated
11 dark apically. Maxillary palpi yellow or yellow ocher, labrumlabrum:
the "upper lip" of beetles, a movable sclerite joined under clypeus
black or amber brown. Pronotumpronotum:
the notum of the prothorax with highly sclerotized pronotal disc
yellow or mustard yellow, subquadrate, weakly bifoveate, with wide shallow foveae, shagreened with minute wrinkles. Scutellumscutellum:
small, usually triangular shield between the bases of elytra
yellow. Elytra yellow or rufous, with two small black or chestnut spots in apicalapical:
of or pertaining to the apex; opposite of basal
area and short humeral and sutural vittae. Elytral epipleura completely yellow, sutural anglesutural angle:
the posterior angle or apex of the elytron near the suture
of elytra obtuse-angled, punctation dense, fine. Abdomen yellow. Legs yellow. Aedeagusaedeagus:
the main sclerotized part of the male genitalia; "aedeagus" is used here instead of "median lobe of aedeagus"
symmetric, with four internal sac scleritessclerites:
(here) the sclerotized hooks, spines or plates in the internal sac
.

Known distribution

Guatemala, Brazil

Host plants

Unknown

Potential problems with identification

Diabrotica sedata Baly is very similar to D. apicicornis Jacoby, D. brevilineata Jacoby, D. palpalis Jacoby, D. fulvicornis Jacoby and D. septemliturata Erichson. They can be separated by the following features: the head and maxillar palpi are black in D. palpalis and D. fulvicornis, yellow in D. sedata; the femora and maxillar palpi of D. apicicornis are black, but yellow in D. sedata; the labrumlabrum:
the "upper lip" of beetles, a movable sclerite joined under clypeus
of D. brevilineata is yellow, but black or amber brown in D. sedata; D. sedata larger on average than all other species. However, the most reliable feature that allows distinguishing D. sedata is the armament of internal sac, which in D. sedata bears four scleritessclerites:
(here) the sclerotized hooks, spines or plates in the internal sac
, while only five in all other mentioned species.