Anaulacomera (Oecella) mediastina, Fianco, 2021

Fianco, Marcos, 2021, Nine new species of the Anaulacomerina subtribe of katydids (Orthoptera Tettigoniidae: Phaneropterinae: Phaneropterini) from Brazil, Zootaxa 4952 (1), pp. 33-54 : 45-47

Anaulacomera (Oecella) mediastina sp. n.

Figures 1A , 8 , 12B

Diagnosis:

Etymology: The specific name derived from Latin (medius = in between, intermediate), refers to the species relation with Furcata and Juanchoi species group, with characteristics of both.

Description: Holotype male ( Fig. 8 , 12B ): Small to medium, yellowish, probably green in life ( Fig. 8A ). Head ( Fig. 8B, C ): Fastigium of the frons triangular; apex protruding; with an ocellus on middle. Antennal sockets a little dilatated at the curvature near base of the fastigium of the frons and in the apex of the fastigium of the frons. Fastigium of the vertex conical; a little dilatated at apex; with a sulcus on middle reaching apex. Thorax: Pronotum plain colour. Pronotal disc ( Fig. 8C ) with posterior margin convex; anterior margin concave; furcal sulci bell-shaped; with the same width from anterior to posterior region. Lateral lobes ( Fig. 8D ) smaller than pronotal disc, longer than wide; anterior margin straight; posterior margin convex and semilunar; humeral sinus presenting an angle of ca. 85º. Tegmina ( Fig. 8A ; 12B ) shorter than hindwings; anal and costal margins parallel; Sc with one bifurcation; R with 12 bifurcations that reaches costal margin; M long, following R in all extension; MA with one apical bifurcation; MP with one bifurcation after half of its length; CuA almost straight, with none bifurcations; stridulatory area of left tegmen with brownish stains, A1 brown ( Fig. 8F, G ). Mesobasisternum ( Fig. 8E ) a little elevated on middle; anterior margin almost concave; lateral lobes small, demilune shaped, posterior margins very distant from each other. Metabasisternum ( Fig. 8E ) triangular; very large; with a straight anterior margin; lateral lobes demilune shaped, not so distant in the posterior margin. Abdomen: Tergite X fused to epiproct; posterior margin projected posteriorly and downwards, depressed on medial region. Cercus ( Fig. 8H, I ) not very long; bifurcation on apex, giving a shallow cup aspect; the ventral process longer than others, curved upwards and to the middle region; medial process shorter than others, triangular; dorsal process as long as half of ventral process, pointed, ending in a spine, moderately curved to the medial region. Subgenital plate ( Fig. 8H, I ) very long; triangular shaped; medial region depressed; posterior processes long, curved upwards and to the medial region, touching in apex. Genitalia ( Fig. 8J, K ): Phallus symmetrical with exception to titillator’s sclerites, rounded, membranous but with two titillator sclerites that is quite big and curves in a U form; and titillator’s tips exposed and more sclerotized.

Type Material: Holotype male, ‘ DPTO ZOOL \ UF –PARANÁ’ ‘Cáceres, MT. \ 14.XI.1984 \ Buzzi, Mielke, Elias \ Casagrande leg. \\ PROJ. POLONOROESTE’, ‘ DZUP 366621’.

Measurements (mm): Holotype: BL: 17.1; TegL: 27; HW: 2.6; PrL: 2.9; PrH: 3.3; FLiii: 16; TLiii: 18.2; SPL: 3.4; CL: 3.2; SFL: 1; TN: 29.

Remarks: Within the subgenera A. ( Oecella ), A. (O.) mediastina sp. n. cannot be exactly placed in any species group, since it differs from A. (O.) marshae sp. n., possessing characteristics of both groups of A. ( Oecella ), i.e., Furcata and Juanchoi species group. This new species confirms the proximity of Furcata and Juanchoi species group, and its positioning in the A. ( Oecella ), when the subgenera was described, by Gorochov (2020), the author comments that the Juanchoi species groups possibly belongs to the aforementioned subgenus. Additionally, this species gives clues that the Furcata and Juanchoi species group are indeed related. From the Juanchoi species group, A. (O.) mediastina sp. n. is closely related to A. (O.) zebrina sp. n., since the apex of male cerci presents three processes, and have a cup-like aspect. From the Furcata species group the closest relative is A. (O.) darwinii Scudder , specially for the thickness of the cerci. Besides being placed in any group of A. ( Oecella ), the A. mediastina sp. n. is more related to the aforementioned species groups of the subgenera than the ungrouped species of the subgenera ( A. (O.) confusa , A. (O.) lingulata , A. (O.) mediastina , and A. (O.) marshae sp. n.)

Figures

FIGURE 1. Occurrence map from the new species of Anaulacomerina from Brazil. A: circles: species from southeastern, north and mid-central Brazil; star: species from Parana State, southern Brazil; B: circles: species from Paraná State, São José dos Pinhais and Morretes municipalities.

FIGURE 8. A. (Oecella) mediastina sp. n. A: male habitus; B: head, dorsolateral view; C: head and pronotum, dorsal view; D: pronotum, lateral view; E: meso and metabasisternum, ventral view; F: stridulatory area, dorsal view; G: stridulatory file; H: terminalia, lateral view; I: terminalia, ventral view; J: phallus, ventral view; K: phallus, dorsal view. Scale bars: A = 1 cm; B–F, H–I = 2 mm; G = 1 mm; J–K = 0.5 mm.

FIGURE 12. Left tegmina of Anaulacomera (Oecella) and Separatula species. Analaucomera (O.) marshae sp. n. (A), A. (O.) mediastina sp. n. (B), A. (O.) spirala sp. n. (C), and A. (O.) zebrina sp. n. (D); Separatula araguaiensis sp. n. Veins: black = Sc; green = R; blue = M; red = Cu; yellow = A1.