Protosticta socculus , Phan, Quoc Toan & Kompier, Tom, 2016

Phan, Quoc Toan & Kompier, Tom, 2016, A study of the genus Protosticta Selys, 1855, with descriptions of four new species from Vietnam (Odonata: Platystictidae), Zootaxa 4098 (3), pp. 529-544: 538-539

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Protosticta socculus

spec. nov.

7. Protosticta socculus  spec. nov.

( Figure 7View FIGURE 7 A –K)

Type specimens. Holotype: male, Aso, Dong Giang district, Quang Nam Province, central Vietnam, 28.V. 2015, Quoc Toan Phan leg.; Paratypes: 4 males, same date, location and collector as the holotype; 4 males, Bhalee, Tay Giang district, Quang Nam Province, 19.IX. 2015, Quoc Toan Phan leg.

Etymology. The specific name socculus  is derived from the Latin word “ socculus  ” (meaning slipper), in reference to the slipper-shaped structure at the tip of the paraprocts.

Description of male holotype. Head ( Fig. 7View FIGURE 7 A). Anteclypeus and labrum pale blue with inferior margin of labrum black. Antennae black, basal half of second segment pale yellow; postclypeus, genae, frons, vertex and occiput entirely black. Prothorax ( Fig. 7View FIGURE 7 B) almost entirely pale yellow, with anterior and posterior lobes black dorsally. Synthorax dull black with pale yellow stripe over metepisternum, black line over interpleural suture and mostly pale yellow metepimeron. Legs pale yellow with black stripe over flexor surface; spines black. Wings ( Fig.View FIGURE 7

7 I) hyaline, 13–15 postnodal veins in both wings. Pterostigma brown. Abdomen long and thin, black with pale yellow markings as follows: S 1–2 short, ventral half pale yellow; S 3–7 very long, blackish brown with whitish anterior ring and indistinct brown sup-apical ring; S 8–9 shorter, dorsum of S 8 blackish brown, large part of basal segment bluish white; S 9 bluish white with anterior and posterior margin black; S 10 entirely black. Anal appendages ( Figs. 7View FIGURE 7 C –G) black; cerci strongly curved downward; paraprocts with elongated tip, tapering, with a prominent slipper-shaped cup-like structure bearing a long spine on its distal margin. Penile organ as in Fig. 7View FIGURE 7 H.

Measurements. Hindwing 19; abdomen including appendages 44.

Female. Unknown.

Variation in paratype males. In the paratype males, the slipper-shaped cup-like structure at the tip of the paraprocts is not as prominent as in the holotype ( Figs. 7View FIGURE 7 J –K), but the spine at the distal margin can be seen easily in lateral view.

Measurements of paratype males. Hindwing 19–20; abdomen including appendages 43–44.

Differential diagnosis. P. s o c cu l us spec. nov. appears to be closely related to P. khaosoidaoensis  judging by the elongated shape of the paraprocts, which both have a very large cup-like structure with a spine at the distal margin on their apex on the dorsal side. It can be separated from that species as follows:

(1) In P. socculus  spec. nov., cerci with only one protuberance ventrally at midpoint ( Figs. 7View FIGURE 7 C, 7 E), two protuberances in P. khaosoidaoensis  ( Fig. 10View FIGURE 10 B).

(2) In P. socculus  spec. nov., the tip of the cerci is structurally complex ( Fig. 7View FIGURE 7 F), flattened and rounded in P. khaosoidaoensis  ( Fig. 10View FIGURE 10 C).

(3) In P. socculus  spec. nov., the dorsum of the synthorax is completely black ( Fig. 7View FIGURE 7 A), a pale yellow line along the dorsal carina in P. khaosoidaoensis  ( Fig. 10View FIGURE 10 A).