Trichillum hirsutum Boucomont, 1928

Vaz-De-Mello, Fernando Z. & Génier, François, 2005, Lectotype designations, new synonymies, and new species in the genera Trichillum Harold and Pedaridium Harold (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 1038, pp. 41-52 : 44-45

Trichillum hirsutum Boucomont

( Figs. 3–4 )

Trichillum hirsutum Boucomont, 1928: 187

Trichillum boucomonti Saylor, 1935: 208 , syn. nov.

Trichillum hirsutum Boucomont :

HOLOTYPE: Ψ, on a triangular card, in MNHN. Labels: [1.] Brésil Sao Paulo / [2.] Ex Museo N. VAN DE POLL / [3. red label] TYPUS / [4. Boucomont handwritten] Trichillum hirsutum n. sp. / [5.] Muséum Paris Boucomont / [6. red label] HOLOTYPE Trichillum hirsutum BOUC. HOLOTYPE.

Trichillum boucomonti Saylor :

HOLOTYPE: Ψ, on a triangular card, in USNM. Labels: [1.] Horqueta Paraguay / [2. red label] HOLOTYPE Trichillum boucomonti L.W. Saylor / [3.] TYPE No. 54102 USNM / [4.] TYPE Trichillum boucomonti Saylor / [5.] = Trichillum hirsutum Boucomont compared w. TYPE Vaz­de­Mello det. 200 0. Examined.

Diagnosis: 3.2–4.0 mm. Externally similar to T. hystrix . However, differing in the shape of the posterior border of the eye ( Fig. 3 ), the shape of the larger sclerite of the internal sac (with two dentiform projections instead of one in T. hystrix ), and the apicoventral portion of the phallobase that bear a broad triangular tubercle that is divided medially.

Remarks: Both holotypes are females. Nevertheless, we feel confident in making this synonymy because all evidence based on the available morphological characteristic support it. Primary type specimens differ in size ( T. boucomonti is smaller) and in the shape of tibial teeth (abraded in T. hirsutum ), but all other characters coincide. These differences are variable amongst a large series of examined material of this species, from a wide distribution range that includes both type localities. Male genitalia (parameres and internal sac) of several specimens have also been compared and no differences were observed.

Figures

FIGURES 1 – 6. Head (1, 3, and 5) and parameres (2, 4, and 6) in dorsal view. 1 – 2. Trichillum heydeni. 3 – 4. T. hirsutum. 5 – 6. Pedaridium bidens.