Pararhagadochir castaneus, Salvatierra, 2020

Salvatierra, Lidianne, 2020, New species of Pararhagadochir Davis, 1940 (Insecta: Embioptera: Scelembiidae) from Brazil, Zootaxa 4816 (3), pp. 383-388 : 384-386

Pararhagadochir castaneus sp. nov.

Figures 1–13

urn:lsid:zoobank.org:act:0F7B9595-6F85-452E-8407-BA90B6F2CEA8

Type material. Holotype male, Brazil, Tocantins, Araguaína , 7°11’28.5” S, 48°13’25.9” W, 11.VII.2019, manual collection, L. Salvatierra coll., deposited in INPA.

Etymology. The specific epithet is derived from the Latin castaneus (chestnut, brown) and refers to the uniformly chestnut-brown color of the species.

Description. The male of Pararhagadochir castaneus sp. nov. resembles those of P. minuta by the small-sized body size (7 mm), but can be readily distinguished from the latter in having longer forewings (6.5 mm), lacking white bands between pro- and mesothorax ( Fig. 1 ), submentum inflexed and strongly sclerotized ( Figs. 3, 4 ), outer tip of 10Lp with both sclerotized and membranous areas ( Figs. 11, 12 ) and Cu vein unforked ( Figs. 5, 7 ).

Male (holotype). Small, alate ( Fig. 1 ). Measurements: head length 1 mm, width 1 mm; body length 7 mm, width 1 mm; forewing length 6 mm, hindwing length 5 mm.

Head capsule slightly elongate-oval, dark chestnut-brown ( Fig. 2 ). Eyes black, medium-sized; separated by two eye-widths ( Fig. 2 ). Antennal segments uniformly chestnut-brown, with the left antenna missing segments past the 16th and the right antenna missing segments past the 12th (left 16-x/ right 12-x). Mouthparts uniformly chestnutbrown. Submentum dark brown ( Figs. 3–4 ).

Thorax and abdomen uniformly chestnut-brown ( Fig. 1 ). All legs entirely brown. Medial bladder close to the apex ( Fig. 8 ).

Wings light brown, with six elongated translucent areas; pinkish on R 1 sides ( Fig. 6 ). Forewing with veins A and Sc ending close to the posterior wing edge; Cu, R 1 + R 2+3, R 4 and R 5 reaching the posterior wing edge; M ending in the middle of the wing; cross-veins present: one conspicuous in M ‒ R 5, one conspicuous in R 1 + R 2+3 – R 4, one inconspicuous in C – R 1 and one conspicuous and two inconspicuous in R 1 + R 2+3 ( Fig. 5 ). Hindwing same as forewing, but differing in having one conspicuous crossvein in M ‒ R 5, one conspicuous in R 1 + R 2+3 – R 4, two conspicuous in C–R 1 and two conspicuous in R 1 + R 2+3 ( Fig. 7 ).

Second cercal segments slightly longer than first ( Figs. 9–11 ). Hp well developed, starting in the middle of H ( Fig. 9 ). LPPT sclerotized, with curved and strongly sclerotized apex ( Fig. 9 ). Distal process of LC1 quadrangular ( Figs. 9–11 ). Caudal margin of 10L concave ( Fig. 11 ). 10Lp broad basally then tapered terminally with inner and outer tips ( Fig. 11 ). Tips of 10Lp subequal ( Figs. 11, 12 ). Hook-like inner tip of 10Lp strongly sclerotized ( Figs. 11, 12 ). Outer tip of 10Lp with both sclerotized and membranous areas ( Figs. 11, 12 ). 10Rp1 long, broad, gradually narrowing with a short and strongly sclerotized talon.

Female. Unknown.

Distribution. Brazil (Tocantins) ( Fig. 13 ).

Remarks. In addition to the description, P. castaneus sp. nov. differs from its congeners by the following characters: small-sized body (all other species with exception of P. minuta and P. surinamensis have a total body length of 8.5 mm or more); full body completely dark chestnut-brown (cream or pale yellow in P. flavicollis and P. schadei ; translucent cream white in P. pallida ; prothorax black with one cream-white band in P. minuta and two cream-white bands in P. bicingillata ); wings present (absent in P. pallida ); eyes medium-sized (reduced eyes in P. minuta , P. trachelia and P. birabeni , and larger eyes in P. flavicollis and P. surinamensis ); Cu unforked (forked in P. balteata , P. flavicollis , P. trinitatis , P. tenuis and P. confusa ); cross-vein present between M and Cu (absent in P. trinitatis , P. tenuis and P. confusa ); outer tip of 10 Lp not bilobed (bilobed in P. birabeni ); outer tip of 10 Lp subequal to the inner tip (OT of 10 Lp shorter than IT in P. minuta , P. bicingillata , P. christae , P. surinamensis , P. pallida , P. schadei , P. flavicollis and P. trachelia ).

Figures

FIGURE 13. Distribution map of the Brazilian species of Pararhagadochir Davis, 1940.

FIGURES 1–8. Male of Pararhagadochir castaneus sp. nov. 1, Habitus, dorsal view; 2, Head, dorsal view; 3, Head, ventral view; 4, Submentum; 5‒6, Forewing; 7, Hindwing; 8, Left hind basitarsus, lateral view.

FIGURES 9–12. Male terminalia of Pararhagadochir castaneus sp. nov. 9, Terminalia, ventral view; 10, LC1 and LC2; 11, Terminalia, dorsal view; 12, detail of 10Lp.