Mesomphalia denudata Boheman, 1850

Simões, Marianna V. P. & Monné, Marcela L., 2014, Taxonomic Revision of the genus Mesomphalia Hope, 1839 (Insecta, Coleoptera, Chrysomelidae), Zootaxa 3835 (2), pp. 151-197 : 176-177

Mesomphalia denudata Boheman, 1850

( Fig. 131–137 , 157 , 166 )

Mesomphalia denudata Boheman, 1850: 227 ; 1856: 39; 1862: 105; Gemminger & Harold, 1876: 3631; Wagener, 1881: 64; Spaeth, 1901: 339; 1914: 32; Blackwelder, 1946: 737; Borowiec, 1996: 192; 1999: 117; Flinte et al., 2009: 589.

Measurements (4 males / 2 females). n=4/2. Total length: 13.7–15.5/14.1–14.5; greatest elytral width: 12.5–13.0/ 12.2–12.9; pronotum length: 3.3–3.5/3.1–3.4; greatest width of pronotum: 7.9–8.4/8.0–8.2; elytral length/width ratio: 1.09–1.19/1.12–1.13; pronotal length/width ratio: 0.41/0.39–0.41.

Diagnosis. Mesomphalia denudata is distinguished from the other species of the genus by: pattern of pubescence in the elytra, with long and decumbent setae at basal third, and an irregular row forming a rounded area at apical third, glabrous triangular areas evident next to apex; irregular, smooth, circular depressions of different sizes on elytra, along lateral margins and inside glabrous regions.

Redescription. Body ellipsoidal, with divergent elytral margins until ante-median region and convergent towards apex; yellowish-brown setae. Vertex with short, sparse, and erect setae and two clusters of coarse punctures, distinctly delimited. Coronal suture with reddish-brown depression.

Antennae with apex of scape, pedicel and antennomeres III–IV dark-brown. Antennomere III–IV increasing in length, about 2x the length of pedicel; V subequal in length to III; VI–X subequal in length; X slightly longer than IX; XI about 2x longer than X, with rounded apex.

Prothorax with a pair of rings of long, dense and decumbent setae. Pronotum with anterior margin slightly sinuous; posterior angle, prosternum with long, dense and semidecumbent setae, decreasing towards apical process. Prosternal collar with shiny anterior margin, lateral apices slightly acute, laterally bulging, followed by long and shallow transverse groove. Prosternal process with longitudinal sulcus extending from median region to apex; apical margin rounded.

Mesoventrite and mesepimera glabrous; mesepisterna with long, sparse and semidecumbent or desumbent setae and mesoventrite process with semidecumbent setae; mesoventrite process with narrow lateral margins, about twice narrower than prosternal process, V-shaped. Elytra 3x longer than prothorax, punctate and with conspicuous macroreticulation apically, bearing long and decumbent setae at basal third; an irregular row forming rounded area at apical third and glabrous triangular areas somewhat evident next to apex; disordered, smooth, circular depressions of different sizes along lateral margins and glabrous regions; basal third flat on males and sloped on females. Gibbosity with perpendicular apex in relation to disc, 0.4–0.5x elytral length.

Metaventrite glabrous, except metepimerum with long, dense and decumbent setae and posterior margin of metaventrite with a row of short, dense and erect setae.

Sternites IV–V with dark-brown ellipsoidal spots; I–IV with rows of long and dense setae on sides.

Remarks. Mesomphalia denudata is similar to M. nudoplagiata in its setal pattern on the elytra and lateral margin with median region expanded, with the apical margin acuminate and divergent apical angles curving dorsally. However, M. denudata does not have a diamond-shaped glabrous area under the humeral angles. There is great similarity to M. variolaris ( Figs. 98–100 ) in the shape of elytra and the presence of smooth, dark, circular depressions of different sizes, but in M. denudata the depressions are larger.

Geographical distribution. Recorded from Brazil (Espírito Santo, Rio de Janeiro) ( Borowiec & Świętojańska2014). A new state record from Brazil ( Bahia ) is added ( Figs. 157 , 166 ).

Material examined (6). Type material. Lectotype ( Figs 133–135 ) and paralectotype at SMNH; and paralectotype ( Figs. 133–137 ) at ZMHB, photographs examined. BRAZIL: No locality: (1 male, MNRJ); (Ex Coll. R. Oberthur 1952) (3 males, MNHN); Bahia: (Ex Coll. A. Fry 1905) (2 females, BMNH).

Figures

FIGURES 157. Map of geographic distribution of Mesomphalia denudata Boheman, 1850; M. sublaevis Boheman, 1850; M. subnitens Spaeth, 1917; M. tumidula Boheman, 1850; M. turrita (Illiger, 1801); M. variolaris Boheman, 1850.

FIGURES 131 – 139. Mesomphalia species: 131 – 137, Mesomphalia denudata Boheman, 1850: 131, dorsal view; 132, lateral view; 133 – 135, lectotype: 133, dorsal view; 134, lateral view; 135, labels; 136 – 137, paralectotype: 136, dorsal view; 137, labels; 138 – 139, Mesomphalia retipennis Boheman, 1850: 138, male, dorsal view; 139, female, dorsal view.

FIGURES 164 – 169. Map of geographic distribution of 164, Mesomphalia tumidula Boheman, 1850; 165, M. variolaris Boheman, 1850; 166, M. denudata Boheman, 1850; 167, M. retipennis Boheman, 1850; 168, M. latipennis Boheman, 1856; 169, M. nudoplagiata Spaeth, 1901.

FIGURES 98 – 100. Mesomphalia variolaris Boheman, 1850. 98, ventral view; 99, dorsal view; 100, lateral view (pc, prosternal collar; ed, elytral disc; gb, gibbosity; lm, lateral margin; ts, transversal sulcus).