Adamastoraltica humicola, Biondi & Iannella & D’Alessandro, 2020

Biondi, Maurizio, Iannella, Mattia & D’Alessandro, Paola, 2020, Adamastoraltica humicola, new genus and new species: the first example of possible moss-inhabiting flea beetle genus from sub-Saharan Africa (Coleoptera Chrysomelidae, Galerucinae), Zootaxa 4763 (1), pp. 99-108 : 105

publication ID

https://doi.org/10.11646/zootaxa.4763.1.8

publication LSID

lsid:zoobank.org:pub:E99DB239-B832-4F6D-9E6B-4248CD843119

DOI

https://doi.org/10.5281/zenodo.3809621

persistent identifier

https://treatment.plazi.org/id/0D69290D-C96D-C840-FF77-FF55C1A302F1

treatment provided by

Plazi

scientific name

Adamastoraltica humicola
status

sp. nov.

Adamastoraltica humicola sp. nov.

Diagnosis. Adamastoraltica humicola sp. nov. is the only known species of the new genus here described, thus, it is clearly distinguishable from other flea beetle species by the genus characters. Similarities with moss-inhabitant flea beetle genera are likely due to adaptive convergence (see “Taxonomic notes” in the description of the new genus). The lack of scutellum is the most evident diagnostic trait. Although it is shared with species of the genus Stegnaspea , A. humicola sp. nov. is easily distinguishable from each Stegnaspea species by several features on head, pronotum, elytra, ventral parts, legs, aedeagus and spermatheca (see “Taxonomic notes” in the description of the new genus).

Type material. Holotype ♂. [ Republic of South Africa] Z A.40 / Table Mount. [Table Mountain] / Wynberg- Cave / Ravine C.P. [Newlands Ravine, 33°58’S 18°44’E] // xi-xii.1960 / Humus // N. Leleup leg. ( MNHN). Para- types. Same data as the holotype, 2 ♂♂ and 3 ♀♀ ( MNHN); Republic of South Africa: Z. A.43 / Table Mountain / Doline. Bats Cave [~ 33°58’S 18°57’E] // Humus / xii.1960 // N. Leleup leg. ( MNHN). GoogleMaps

Description of the holotype (♂). Body ovate in dorsal view, very strongly and evenly convex in lateral view ( Figs 1–3 View FIGURES 1–3 ); total length of body (LB) = 1.33 mm; maximum pronotal width at base (WP = 0.59 mm); maximum width of elytra at middle (WE = 0.89 mm). Dorsal surface glabrous, metallic black, without evident punctures ( Figs 1, 3–4 View FIGURES 1–3 View FIGURES 4–11 ); antennae and legs brown. Head ( Figs 5–6 View FIGURES 4–11 ) with impunctate surface; supraorbital and suprafrontal grooves joined and distinctly impressed; inter-antennal space slightly wider than length of the first antennomere; frons length (from upper orbital line to clypeus) about three times the inter-antennal space; frontal ridge wide, slightly raised, apically rounded; eyes sub-elliptical, small; interocular width about four times the transverse width of each eye; labrum apically deeply incised ( Fig. 7 View FIGURES 4–11 ); antennae about as long as half body length (LAN = 0.71 mm; LAN/LB = 0.54); last antennomeres distinctly wider than middle ones ( Fig. 1 View FIGURES 1–3 ); LA: 100:82:68:54:64:54:64:64:68:77:136. Pronotum ( Figs 3–5 View FIGURES 1–3 View FIGURES 4–11 ) very convex, in dorsal view transverse, distinctly longer medially than laterally (LP = 0.38 mm; WP/LP = 1.54), with slightly rounded sides converging anteriorly; surface apparently smooth, but with very sparse and very shallow punctation; anterior, lateral, and basal margins very finely bordered ( Fig. 5 View FIGURES 4–11 ); anterior and posterior angles not prominent. Scutellum absent. Metathoracic wings absent. Elytra ( Figs 1–3 View FIGURES 1–3 ) moderately elongate (LE = 1.16 mm; WE/LE = 0.77; LE/LP = 3.04), strongly convex, with clearly rounded sides, apically jointly acute; lateral margin thin, not visible in dorsal view; surface smooth, with very sparse and very shallow punctation. Humeral calli absent. First pro- and mesotarsomeres weakly enlarged ( Figs 1 View FIGURES 1–3 , 8a View FIGURES 4–11 ). Ventral parts brown; last abdominal ventrite without preapical sculptures or impressions. Median lobe of aedeagus ( Fig. 10 View FIGURES 4–11 ) (LAED = 0.56 mm; LE/ LAED = 2.09) with smooth surface; slightly tapered and weakly sinuate laterally in ventral view, apically rounded, with a median tooth; basal opening large; median lobe distinctly and evenly curved in lateral view, gradually thinner towards apical part, with dorsally oriented apex; dorsal ligula wide, laterally parallel, extending from half-length of aedeagus to subapical part.

Variation. Males (n = 4; range): 1.16 ≤ LE ≤ 1.24 mm; 0.89 ≤ WE ≤ 0.90 mm; 0.38 ≤ LP ≤ 0.40 mm; 0.59 ≤ WP ≤ 0.60 mm; 0.68 ≤ LAN ≤ 0.73 mm; 0.56 ≤ LAED ≤ 0.57 mm; 1.33 ≤ LB ≤ 1.41 mm; 3.04 ≤ LE/LP ≤ 3.13; 1.47 ≤ WE/WP ≤ 1.51; 1.52 ≤ WP/LP ≤ 1.54; 0.72 ≤ WE/LE ≤ 0.77; 0.51 ≤ LAN/LB ≤ 0.54; 2.09 ≤ LE/LAED ≤ 2.14. Fe- males (n = 3; range): 1.22 ≤ LE ≤ 1.38 mm; 0.89 ≤ WE ≤ 1.08 mm; 0.37 ≤ LP ≤ 0.44 mm; 0.60 ≤ WP ≤ 0.65 mm; 0.69 ≤ LAN ≤ 0.75 mm; 0.17 ≤ LSPC ≤ 0.19 mm; 1.40 ≤ LB ≤ 1.67 mm; 2.93 ≤ LE/LP ≤ 3.11; 1.44 ≤ WE/WP ≤ 1.66; 1.44 ≤ WP/LP ≤ 1.62; 0.71 ≤ WE/LE ≤ 0.78; 0.45 ≤ LAN/LB ≤ 0.50; 7.00 ≤ LE/LSPC ≤ 7.25. Paratypes very similar in shape, sculpture and color to the holotype. Females distinguishable by the less enlarged first pro- and mesotarsomeres. Spermatheca ( Fig. 11a View FIGURES 4–11 ) with elongate, subcylindrical basal part gradually narrower from half-length towards the distal part; distal part about as long as 1/3 of the basal part, lacking distinct collum and appendix; ductus short, uncoiled, U-shaped, apically inserted. Tignum ( Fig. 11b View FIGURES 4–11 ) elongate and narrow, in lateral view basally and apically clearly curved; vaginal palpi ( Fig. 11c View FIGURES 4–11 ) thin, basally not connected, moderately sclerotized along their entire length, apically with three setae.

Etymology. The specific epithet is after the word “humus”, the type of habitat where the specimens of the new species were collected.

Distribution. Republic of South Africa, Western Cape Province ( Table 1; Fig. 12 View FIGURE 12 ). Possible Southern-Western Afrotropical chorotype (SWA).

Ecological notes. All the specimens were collected in humus, in a site without trees or shrub vegetation. Considering the species morphology (see “Diagnosis” in the description of the new species) and the absence of leaf litter in the collection site, Adamastoraltica humicola sp. nov. is likely to be a moss inhabitant.

MNHN

Museum National d'Histoire Naturelle