Platystigma buckleyi ( McLachlan, 1881 )

Machado, Angelo B. M. & Soldati Lacerda, Déborah S., 2017, Revalidation of Platystigma Kennedy, 1920, with a synopsis of the quadratum species group and the description of three new species (Odonata: Pseudostigmatidae), Zootaxa 4242 (3), pp. 493-516: 498-499

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Platystigma buckleyi ( McLachlan, 1881 )

n. comb.

Platystigma buckleyi ( McLachlan, 1881)   n. comb.

P. garleppi   (Fӧster, 1903)

P. amazonica   (Sjӧsted, 1918)

Kimmins (1970:103); McLachlan (1881:32); Davies & Tobin (1984: 58); Garrison & Ellenrieder (2016: 20); Bridges (1994: VII –39); Tsuda (2000: 57); Lencioni (2005: 153); Heckman (2008: 208); Garrison, Ellenrieder & Louton (2010: 391); Schorr & Paulson (2016).

Material examined: none.

Description. Description based on McLachlan (1881), who described two males from the district of Bobonaza, Ecuador.

Head. In one specimen the labrum is yellow, the anteclypeus, postclypeus and antefrons greenish. In another specimen the labrum is dark olive with narrow yellow anterior border, anteclypeus and postclypeus black. Upper part of head black.

Thorax. Prothorax: black with very narrow pale yellow border. Pterothorax: black with two greenish yellow humeral lines originating in opposite directions, the anterior very short and scarcely overlapping the posterior one. Venter yellowish, with black middle line, and small anterior and posterior spots.

Legs. Black with yellow line externally on femora and internally on tibiae.

Wings. Fw hyaline, without pale apical area, pseudostigma dark brown. Hw with small (4 mm broad) milkywhite (or yellowish) pale apical area on which the border is slightly elevated.

Measurements (mm): Hw 44–48, abdomen 58–65.

Remarks. According to McLachlan (1881), the male P. buckleyi   is perhaps most nearly allied to P. astictum   , from which it differs especially because its Hw has the apical area pale, whereas P. astictum   has no pale apical area; and the Fw in P. astictum   has a scarcely indicated pseudostigma, while P. buckleyi   has visible pseudostigma. It is not certain that the female described by McLachlan (1881) as P. buckleyi   is conspecific with the male lectotype. The identity of P. buckleyi   will remain uncertain until the penis of the lectotype in the British Museum is studied. The paralectotype may be a new species, as its color is slightly different from that of the lectotype ( McLachlan 1881).

Platystigma amazonica   (Sjӧsted, 1918) from the Brazilian State of Amazonas and P. garleppi   (Fӧrster, 1903) from Ecuador have been regarded as junior synonyms of P. buckleyi   by Lencioni (2005) and Garrison et al. (2010), respectively. It is possible that they will prove to be good species after their penes are studied.

Platystigma humaita   sp. nov.

Figures 10 View FIGURES 8 – 13 , 16 View FIGURES 14 – 19 , 22 View FIGURES 20 – 24 , 31 View FIGURES 29 – 32 , 39 View FIGURES 37 – 41 , 46, 47 View FIGURES 42 – 51 , 56, 57 View FIGURES 54 – 61

Material examined. Holotype ♂: Brazil, Acre State, Porto Acre (09o 45' 19"S, 67° 40' 18"W), Reserva Florestal de Humaitá   , 28–31.VII.2008, Mielke & Casagrande leg. Type deposited in the ABMM Collection. GoogleMaps  

Etymology. Humaita   , noun in apposition. A reference to the fact that the type was collected in the Forest Reserve of Humaita   .

Description of the male holotype. Head. Labium yellow, face pale blue with pair of small black rounded spots at the lateral part of the labral-clypeal suture. Upper part of head black, with a narrow yellow transverse occipital stripe.

Thorax. Prothorax: pronotum ( Fig. 10 View FIGURES 8 – 13 ) black with S-shaped grayish yellow lateral stripe connected with oblong yellow transverse marking on anterior lobe. Posterior lobe bordered with yellow. Propleuron yellowish white with dorsal oblong black spot ( Fig. 10 View FIGURES 8 – 13 ). Pterothorax: mesepisternum ( Fig. 16 View FIGURES 14 – 19 ) black with middorsal carina yellow. Antehumeral yellow stripe reduced to small subtriangular marking. Posthumeral yellow stripe not reaching lower part of sclerite. Mesepimeron black, metapleuron yellow with black stripe along metapleural suture. Venter with posterior and anterior triangular black spot, latter continued in black midline ( Fig. 22 View FIGURES 20 – 24 ).

Wings. Both Fw and Hw with pale apical areas, with venation white reaching level of RP3 ( Fig. 31 View FIGURES 29 – 32 ). Area of Fw bluish white with space posterior to RA blue, and that of Hw bluish white. Pseudostigma in both wings blue with nine cells in Fw and in Hw. At high saturation, both pale area and pseudostigma becomes more intense blue.

Venation: Px in Fw 33, in Hw 29. RP 2 in Fw arising at level of Px 8, in Hw at Px 9. IR1 arising near Px 13 in Fw, Px 14 in Hw. RP2 both wings branching from RP at less than half distance from subnodus to tip of wing. In Fw and Hw petiolation distal to CuP by a distance about 5X the length of CuP.

Legs. Femora flexural surface yellow, extensor surface brown; tibiae flexural surface brown, extensor surface yellow. Tarsi black.

Abdomen. S1–7 dorsally black, laterally yellow. S8–9 blue, S10 dorsally blue, laterally brownish yellow. Cercus black.

Structural characters. Median and lateral portions of posterior prothoracic lobe not separated and posterior border slightly convex ( Fig. 10 View FIGURES 8 – 13 ). Supplementary tooth of tarsal claw absent. Cleft of anterior lamina shaped as ogival Gothic arch ( Fig. 39 View FIGURES 37 – 41 ). Anterior hamuli with ear-like basal plate. End of batilliform lamina hardly visible. Posterior hamuli with apex sclerotized and curved anteromedially ( Fig. 39 View FIGURES 37 – 41 ). Penis segment 3 in ectal view subquadrate with small tongue-like apical lobe and distolateral tuft of spines ( Fig. 46 View FIGURES 42 – 51 ); in lateral view with distal and proximal tuft of spines ( Fig. 47 View FIGURES 42 – 51 ). Penis segment 2 with tuft of spines near the commissure ( Figs. 46–47 View FIGURES 42 – 51 ).

Abdomen. S10 slightly elevated dorsally ( Figs. 56–57 View FIGURES 54 – 61 ), hind border with medial concavity ( Fig. 56 View FIGURES 54 – 61 ). Cerci in dorsal view convergent distally ( Fig. 56 View FIGURES 54 – 61 )

Measurement (mm): Hw 46, abdomen 65.

Female: unknown.

Remarks. P. humaita   differs from all known species of Platystigma   , except P. martinezi   and P. minimum   , by having pale apical area in both Fw and Hw. It differs from those species by having the penis with segment 3 subquadrate, and the border of male Hw without subapical elevation.