Merobruchus pIckelI ( Pic, 1927 )

Manfio, Daiara & Ribeiro-Costa, Cibele Stramare, 2016, A key to American genus Merobruchus Bridwell (Coleoptera: Chrysomelidae: Bruchinae) with descriptions of species and two new host plant records for the subfamily, Zootaxa 4078 (1), pp. 284-319 : 291-292

publication ID	https://doi.org/ 10.11646/zootaxa.4078.1.25
publication LSID	lsid:zoobank.org:pub:78037DEE-A4F0-4E28-8135-EFD57552C3D0
DOI	https://doi.org/10.5281/zenodo.6057386
persistent identifier	https://treatment.plazi.org/id/039487A5-017B-FF8E-FF3B-FB126166FE88
treatment provided by	Plazi
scientific name	Merobruchus pIckelI ( Pic, 1927 )
status

Treatment

Merobruchus pIckelI ( Pic, 1927)

( Figures 22 View FIGURES 18 – 26 , 40 View FIGURES 35 – 40 , 45–46 View FIGURES 41 – 46 , 69 View FIGURES 69 – 80 , 93 View FIGURES 93 – 104 , 119 View FIGURES 119 – 123 , 143 View FIGURES 140 – 145 )

Pseudopachymerus pickeli Pic, 1927: 32 (original description, type locality: " Brazil ", type depository: MNHN), Bondar, 1936: 26 (distribution), Kingsolver & Silva, 1991: 414 (citation).

Caryedes pickeli: Blackwelder, 1946: 758 (distribution), Udayagiri & Wadhi, 1989: 76 (catalogue).

Gibbobruchus pickeli: Zacher, 1952: 467 (host plant; questionable if related to P. pickeli Pic, 1927 ).

Merobruchus pickeli: Kingsolver, 1988: 2 , 4, 63 (new combination, distribution, taxonomy), Kingsolver & Silva, 1991: 414 (citation), Romero-Nápoles & Johnson, 2004: 386 (distribution questionable).

Pseudopachymerus pickeli subnotatus Pic, 1927: 32 (original description, type locality: " Brazil "). New synonym.

Caryedes pickeli var. subnotata Blackwelder, 1946: 758 (distribution).

Pseudopachymerus steinbachi Pic, 1934a: 116 (synonymized by Kingsolver, 1988: 2).

Caryedes steinbachi: Blackwelder, 1946: 758 (distribution), Udayagiri & Wadhi, 1989: 77 (distribution).

Material examined. Type material. Pseudopachymerus pickeli Pic, 1927 and Pseudopachymerus pickeli var. subnotatus Pic, 1927 . Holotypes deposited in MNHN, females ( Fig. 156 View FIGURE 156 ): Labels: (1) “360” (2) “ Brésil /São Bento/ (Dª B. Pickel)” [Handwritten] (3) “sementes de/Pithecolobium/ saman Benth / v.aculifolia ” [Handwritten] (4) “ Pseudopachymerus /prob stenocephalus” [Handwritten] (5) “ Pickeli n sp/et v. subnotatus/mihi” [Handwritten] (6) “ HOLOTYPE ” [Red label printed in black] (7) “ Pseudopachymerus / pickeli Pic Type /Marked +/ P. pickeli v. subnotatus /Pic/unmarked/specimen Type /J. M. Kingsolver´72” [Handwritten] (8) “ Merobruchus / pickeli ( Pic, 1927) / Ribeiro-Costa, C.S. det. 2007”. Additional material. BRAZIL. 1, Chapada, Chapada Forest, May, Acc.No.2966, homotype label ( USNM). Mato Grosso: 7, Cuiabá, 1987, Nonato P. & Dorval A. col., semente de sete-casca (popular name of Samanea tubulosa ) ( DZUP); 3, Cuiabá, 987, Nonato P. & Dorval A. col., semente de chico-magro ( DZUP).

Redescription, holotype. Body length: 3.88 mm; width: 2.53 mm.

Integument. Dorsum ( Fig. 22 View FIGURES 18 – 26 ): pronotum reddish brown and dark brown; elytron bicoloured, anterior half brown and posterior half dark brown. Antenna: pale brown ( Fig. 36 View FIGURES 35 – 40 ). Ventral region: reddish brown and dark brown except anterior and middle legs pale brown ( Fig. 36 View FIGURES 35 – 40 ). Pygidium ( Fig. 69 View FIGURES 69 – 80 ): reddish brown and dark brown.

Pubescence. Dorsum ( Fig. 22 View FIGURES 18 – 26 ): pronotum pale brown and yellowish gray, pubescence denser at lateral; scutellum white; elytron variegated, pale brown, white and coppery. Ventral region: mostly white; abdominal ventrites uniformly pubescent ( Fig. 36 View FIGURES 35 – 40 ). Pygidium ( Fig. 69 View FIGURES 69 – 80 ): white and yellowish gray, homogeneous and dense, except spots with slightly sparse pubescence.

Body. Subquadrate body. Head: with occipital sulcus ( Figs 2 View FIGURES 1 – 8 , 40 View FIGURES 35 – 40 ); ocular index 3.06; ocular sinus 0.18 mm ( Fig. 2 View FIGURES 1 – 8 ); postocular lobe moderate ( Fig. 36 View FIGURES 35 – 40 ); frons slightly elevated, with conspicuous frontal carina, microsculptate, with regular borders, not enlarged at base ( Figs 2 View FIGURES 1 – 8 , 40 View FIGURES 35 – 40 ); frontoclypeal carina distinct. Antenna: serrate, antennomeres 4–10 with the same width ( Fig. 36 View FIGURES 35 – 40 ); antennomere 11 longer than wide. Pronotum: lateral margins straight in dorsal view ( Fig. 22 View FIGURES 18 – 26 ); basal lobe with straight margin; median gibbosity slightly elevated, anterior region divided by shallow longitudinal sulcus ( Fig. 22 View FIGURES 18 – 26 ); lateral gibbosities slightly elevated ( Fig. 22 View FIGURES 18 – 26 ); coarse punctation dense at disc, intermixed with fine punctation all over pronotum ( Fig. 22 View FIGURES 18 – 26 ); lateral carina absent. Scutellum: wider than long ( Fig. 22 View FIGURES 18 – 26 ), bidentate. Elytron: humeral gibbosity conspicuous ( Figs 4 View FIGURES 1 – 8 , 22 View FIGURES 18 – 26 ); basal gibbosity absent ( Figs 45–46 View FIGURES 41 – 46 ); striae regular in course, free apically and visibly impressed, except 4–6 formed only by isolate punctation ( Fig. 45 View FIGURES 41 – 46 ); striae 3–5 with basal denticle ( Fig. 46 View FIGURES 41 – 46 ). Mesoventrite: mesoventral process rounded apically; postmesocoxal sulcus rounded, following the curvature of the coxa ( Fig. 47–48 View FIGURES 47 – 48 ). Metaventrite: not protuberant in lateral view ( Fig. 36 View FIGURES 35 – 40 ); metanepisternum with sparse, coarse punctation; dorsal carina incomplete, not limiting posterior corner and margin. Hind leg: femur in lateral view projects beyond pygidium ( Fig. 4 View FIGURES 1 – 8 ); pecten with 4 teeth; internal margin without denticles at anterior region before pecten. Tibia, external face smooth, not microserrate; lateroventral carina complete; mucro longer than width of tibia apically; coronal tooth absent; curvature of tibia at external margin reaching half-length of tibia. Abdomen: last ventrite, median apical border with arcuate emargination, with short lateral projections ( Fig. 55 View FIGURES 49 – 56 ). Pygidium : entirely convex; median lateral tubercles slightly elevated; apical margin truncate.

Male genitalia. Median lobe ( Fig. 119 View FIGURES 119 – 123 ): length about 4 x maximum width of base of ventral valve. Ventral valve arcuate, wider than long and narrower than median lobe apically. Apical region with dense spines, short plates bi- or tridentate, sparse denticles. Median region with sparse denticles; Y-shaped sclerite with upper stem straight and lateral stems curved; four dentate sclerites with large base, two with about 2 x the size of the other. Basal region with spicules. Basal hood bilobate, wider than largest width at base of ventral valve. Tegmen ( Fig. 143 View FIGURES 140 – 145 ): lateral lobes moderately emarginate, emargination reaching slightly over half of its length; external margin straight and internal margin concave; apex truncate, oblique, convergent; with projections turned toward the ring.

Variability. Body length (n = 10): 3.37–4.15 mm; width: 2.3–2.72 mm.

Integument. Pygidium : reddish brown.

Pubescence. Dorsum: pronotum with sparse white pubescence; elytron sometimes with sparse yellowish gray pubescence. Pygidium : white.

Body. Head: ocular index 3.65–3.46; ocular sinus 0.11–0.16 mm. Hind leg: femur, pecten with 5 teeth.

Female. Abdomen: last ventrite, median apical border with arcuate emargination, with long lateral projections forming digitate process ( Fig. 52 View FIGURES 49 – 56 ). Pygidium : almost straight in female ( Fig. 93 View FIGURES 93 – 104 ).

Diagnosis. Merobruchus pickeli differs from M. bicoloripes by the antennae entirely pale brown ( Fig. 36 View FIGURES 35 – 40 ), pronotum with slightly elevated median gibbosity and with straight lateral margins ( Fig. 22 View FIGURES 18 – 26 ), elytron with a denticle at the base of the striae 3–5 ( Fig. 46 View FIGURES 41 – 46 ), the lateral lobes of the tegmen of male genitalia ( Fig. 143 View FIGURES 140 – 145 ) with an oblique and convergent apex and with projections toward the ring.

Distribution. Brazil (Mato Grosso).

Host plant. Fabaceae , Mimosoideae , Ingeae : Samanea tubulosa (Benth.) Barneby & J.W.Grimes (= Pithecellobium saman var. acutifolium Benth )

Remarks. We requested the type material of Pseudopachymerus pickeli from the MNHN and received two specimens glued on the same paper rectangle. In the original description of Pseudopachymerus pickeli, Pic also described Pseudopachymerus pickeli var. subnotatus . Next to one exemplar there is a marking red cross. This mark is also present in the upper half of a handwritten label by Kingsolver (“ Pseudopachymerus / pickeli Pic Type / marked +”; Fig. 156 View FIGURE 156 ) showing that this is the exemplar named P. pickeli . The other exemplar, unmarked, is associated with the information in the lower half of the same label (“ P. pickeli v. subnotatus / Pic Type unmarked specimen/ J. Kingsolver 72”; Fig. 156 View FIGURE 156 ). Both specimens differ slightly only by the pubescence colour, so the taxa are here synonymized. Romero-Nápoles & Johnson (2004) included Nicaragua as a distribution record for M. pickeli and cited Kingsolver (1988). However, Kingsolver (1988) did not deal about geographical distribution of M. pickeli , only mentioned that this species is South American. So, Nicaragua is a questionable record.

MNHN	Museum National d'Histoire Naturelle
USNM	Smithsonian Institution, National Museum of Natural History
DZUP	Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure

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Taxonomy

Kingdom	Animalia
Phylum	Arthropoda
Class	Insecta
Order	Coleoptera
Family	Chrysomelidae
Genus	Merobruchus