Mesomphalia tumidula 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 : 173-174

Mesomphalia tumidula Boheman, 1850

( Fig. 121–123 , 157 , 164 )

Mesomphalia tumidula Boheman, 1850: 224 ; 1856: 38; 1862: 103; Gemminger & Harold, 1876: 3635; Wagener, 1881: 63; Spaeth, 1914: 33; Blackwelder, 1946: 738; Borowiec, 1999: 118; Flinte et al., 2009: 589.

Measurements (1 male / 6 females). Total length: 16.0/17.5–18.0; greatest elytral width: 15.0/15.0–16.5; pronotum length: 4.3/4.5–5.4; greatest width of pronotum: 9.5/10.5– 11.1; elytral length/width ratio: 1.06/1.13–1.20; pronotal length/width ratio: 0.45/0.44–0.49.

Diagnosis. Mesomphalia tumidula can be easily differentiated from the other species of the genus by: pronotum with a pair of spots of yellowish-brown setae surrounded by an orangish-red ring, surrounded by another yellowish-brown ring; elytra with deep and dense punctures, except parascutellar disc striated; apical margin, apex of gibbosity, and smooth circular depressions bearing short, moderately dense and semidecumbent yellowishbrown setae, except for humeral angles, lateral margins of elytra, and glabrous circular depressions.

Redescription. Body subrounded with yellowish-brown setae, except for orangish-red ring on the pronotal spots. Vertex glabrous with coarse and dense punctures. Coronal suture with reddish-brown depression.

Antennae with scape, pedicel and antennomeres III–IV dark brown and apices yellowish-brown or scape and antennomere III with apices ranging from yellowish-brown to dark-brown and pedicel ranging from yellowishbrown to reddish-brown; antennomere III half the length of IV; IV about twice the size of V; VII shortest antennomere; VI, VII–X subequal in length; XI with truncate apex.

Prothorax with a pair of spots of long, dense and decumbent setae, with yellowish-brown circle surrounded by orangish-red ring and another yellowish-brown peripheral ring. Pronotum with anterior margin slightly sinuous; posterior angle truncate. Prosternum with long, sparse and semidecumbent setae, except anterior margin of procoxal cavity with short, dense and decumbent setae. Prosternal collar distinctly projecting anteriorly, with anterior margin strongly sinuous, medianly subtruncate, with lateral apices divergent and slightly acuminate, followed by short, shallow transverse groove, with anterior margin of anterolateral angle subtruncate and rounded apical margin on males, and long, deep groove with anterior margin of anterolateral angle rounded and subtruncate apical margin on females. Prosternal process with wide lateral margins, with deep and short longitudinal sulcus, starting at median region and extending to post-median region, not reaching apex; parallel lateral margins; acuminate apical margin. Elytra with lateral margin broader at median region; apical angle rounded, convergent and slightly projected dorsally. Gibbosity approximately half length of elytra, slightly tilted anteriorly.

Mesoventrite and mesepimera glabrous; mesoventrite process with short, sparse and semidecumbent setae; mesoventrite process with wide lateral margins, about 2x shorter than prosternal process, U-shaped, with truncate apex.

Metaventrite with long, sparse and decumbent setae at lateral margin and posterior margin with row of short, erect and dense setae; metepimera with long, dense and decumbent setae, except lateral margins with glabrous circular depressions.

Abdominal ventrites III–V with reddish-brown ellipsoidal spots; I–IV with short row of long, decumbent setae, becoming denser laterally.

Remarks. Mesomphalia tumidula is similar to M. latipennis ( Figs. 144–147 ) as both have elytra with conspicuous macroreticulation, bearing moderately long, dense and semidecumbent setae. However, M. tumidula differs by having the spots on the prothorax, reticulated pubescence on the elytra, and the gibbosity with a narrow apex.

Geographical distribution. Brazil (Rio de Janeiro) ( Boheman 1850) ( Figs. 157 , 164 ).

Material examined (7). BRAZIL: Rio de Janeiro: Miracema, 1876–1882, Auguste Vicent de Lyon (Ex Coll. R. Oberthur) (1 male, 6 females, MNHN).

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 114 – 122. Mesomphalia species: 114 – 116, Mesomphalia subnitens Spaeth, 1917: 114, dorsal view; 115, lateral view; 116, holotype, dorsal view; 117 – 120, Mesomphalia sexmaculosa Boheman, 1856: 117, dorsal view; 118, lateral view; 119, holotype; 120, labels; 121 – 122, Mesomphalia tumidula Boheman, 1850: 121, male, dorsal view; 122, female, dorsal view.

FIGURES 123 – 130. Mesomphalia species: 123, Mesomphalia tumidula Boheman, 1850; 124 – 130, Mesomphalia variolaris Boheman, 1850: 124, dorsal view; 125, lateral view; 126 – 128, lectotype: 126, dorsal view; 127, lateral view; 128, labels; 129 – 130, paralectotype: 129, dorsal view; 130, labels.

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 140 – 147. Mesomphalia species: 140 – 143, Mesomphalia retipennis Boheman, 1850: 140, lateral view; 141 – 143, holotype: 141, dorsal view; 142, lateral view; 143, labels; 144 – 147, Mesomphalia latipennis Boheman, 1850: 144, dorsal view; 145, lateral view; 146 – 147, holotype: 146, dorsal view; 147, labels.