Enderleina plagata, Hamada & Silva, 2019

Hamada, Neusa & Silva, Jeferson Oliveira Da, 2019, Two new species of Enderleina Jewett (Plecoptera: Perlidae) from northern Brazil, Zootaxa 4712 (3), pp. 377-391 : 378-383

Enderleina plagata new species

( Figs. 2–10 )

Enderleina yano: Ribeiro & Rafael (2005) [misidentified]; Derka et al. (2019) [species distribution]

Type Material. Holotype, BRAZIL, Amazonas State , São Gabriel da Cachoeira County, Morro dos Seis Lagos, 28.ix–06.x. 1990, 800 m a.s.l., Malaise trap, collectors J.A. Rafael & J. Vidal (1 male, INPA) . Paratypes, same data as holotype (4 females, 1 male, INPA)

Diagnosis. Adults head dorsally dark brown from posterior margin to the median ocellus, yellow from median ocellus to anterior margin of labrum ( Figs. 3A , 9A ); fore- and hindwings transversally striped, divided into five color divisions: a) basally dark brown, b) followed by yellow and dark brown, c) dark brown, d) yellow e) and, dark brown distally ( Figs. 2A, B , 7A, B ). Penial armature composed of a median sclerite with elongated body acuminated toward apex on its ⅓ distal region ( Figs. 5A, B , 6A, B ), bearing spiniform projections ventrally on an area between median and basal region of median sclerite ( Figs. 5D, E , 6B ), and a pair of basolateral arms, each with one ventral and one dorsal elongated projection ( Figs 5A, B , 6A, B ).

Etymology. The specific epithet of the new species derives from the Latin word plagata , meaning striped, due to the characteristic wing pattern on male and female wings.

Description. Male ( Figs. 2–6 ). Total length: 12.5 mm, 12.9 mm (from head anterior region until forewing apex, n = 2). Forewing length: 10 mm, 10.2 mm (n = 2). Head: In dorsal view, parietal region and frons, including ocellus area, dark brown; anterior region, from median ocellus until anterior margin of labrum yellowish orange ( Fig. 3A ); median ocellus half the diameter of lateral ocelli; head yellow in ventral view, except area behind the eyes; maxillary and labial palps yellowish brown ( Fig. 3C ); antennal flagellomeres becoming darker (brown) towards the end; scape, pedicel and first flagellomere yellow. Thorax: Pronotum yellow; mesonotum dark brown with some yellow marks posteriorly ( Figs 2A, B , 3B ); lateral and ventral region yellow. Fore- and hindwings transversally striped, divided into five color sections: a) basal dark brown, b) followed by yellow and dark brown, c) dark brown, d) yellow e) and, dark brown distally ( Fig. 2A, B ). Legs, coxae yellow, fore and middle femur ⅓ basal region yellow; remaining region dark brown, hind femur ⅔ basal region yellow; remaining region dark brown ( Figs. 2A, B ). Abdomen: yellow. Tergum X with two groups of sensilla basiconica ( Stark 1989), one on each lateroposterior region ( Fig. 4B ). Paired paraproct elongated with apical region sclerotized, especially anteriorly ( Fig. 4 C–F), with two subbasal spines anteriorly ( Fig. 4 D–F) downwardly directed ( Fig. 4E, F ). Sternum IX with a rounded and slightly pronounced hammer, located near posterior margin ( Fig. 4B ). Cerci with three first articles yellowish; following ones dark brown; articles with whirl of dark and strong setae and abundant thinner setae ( Fig. 2B , 4A, B, D, E ). Penial armature composed of a median sclerite and a pair of basolateral arms. Median sclerite elongated, concave dorsally, tapered toward ⅓ of apex ( Fig. 5A, B, F ); with lateral constrictions at approximately ⅓ distal region ( Fig. 5A, B, D ); these constrictions result a wavy appearance in lateral view ( Fig. 5C ); ventrally, bearing spiniform projections on an area between median and basal region of median sclerite ( Figs. 5D, E , 6B ). Basolateral arms, each with one ventral and one dorsal elongated projection; both projections narrower at the base, wider distally with a needlelike structure on the inner side of distal margin ( Figs. 5A, B , 6A, B ); ventral projection darkly sclerotized, darker and shorter than dorsal one ( Figs. 5B , 6B ). Membrane on basal region of aedeagus covered with distinct setae.

Female ( Figs 7–10 ): Total length: 15.6 mm, 16 mm (from head anterior region until forewing apex, n = 2). Forewing length: 12.8 mm, 13.2 mm (n = 2). Head: Similar in color to those of male ( Fig. 9 A–C). Thorax: Similar in color to those of male ( Figs. 7 , 8 , 9C ). Abdomen: yellow ( Fig. 8B ). Tergum IX wider than long, with a dense group of dark setae on posterior margin, bulging region medially with dark setae ( Fig. 10A ). Sternum VIII (subgenital plate) wider than long, with ratio between length (median region) and width (widest region) 0.6; approximately hexagonal in shape, with anterior margin shorter than posterior one, the latter strongly rounded laterally ( Fig. 10B ); distal margin with median area darker than other regions with a shallow V-shape notch medially, with longer and stronger setae than on the other regions ( Fig. 10B ). Sclerotized band of sternum IX at the same height as posterior margin of sternum VIII ( Fig. 10B ); band thicker laterally, becoming narrower medially, almost interrupted at median region ( Fig. 10C ). Cerci long, setose; segments 1–3 light colored; following segments increasingly darker ( Fig. 10A )

Nymph: unknown.

Figures

FIGURE 2. Enderleina plagata n. sp. male. A. Dorsal habitus. B. Lateral habitus.

FIGURE 3. Enderleina plagata n. sp. male. A. Head, frontodorsal view. B. Head and thorax, dorsal view. C. Head, frontal view. D. Partial view of abdominal distal region, base of left cercus.

FIGURE 4. Enderleina plagata n. sp. male, abdomen, distal region. A. Dorsal view: tergum X, paraproct and base of cercus, arrows indicate sensilla basiconica. B. Ventral view: sternum IX, arrow indicates hammer. C. Posterodorsal view, arrows indicate paraprocts. D. Left lateral view: segments VII – X). E. Left lateral view of Tergum X, paraproct (arrow indicates two subbasal spines) and base of cercus. F. Paraproct, left lateral view (arrows indicate two subbasal spines).

FIGURE 5. Enderleina plagata n. sp. male penial armature. A. Dorsal view. B. Ventral view. C. Right lateral view. D. Right lateroventral view, spiniform projections indicated. E. Detailed view of spiniform projections on the ventral region of median sclerite. F. Posterior view, slighted tilted dorsally, of apical region of median sclerite and apical region of dorsal projection of basolateral arms. Note: ms = median sclerite body; ba = basolateral arms of median sclerite; dp = dorsal projection of basolateral arms of median sclerite; vp = ventral projection of basolateral arms of median sclerite; ne = needle-like structure on the inner side of distal margin of dorsal and ventral projections of basolateral arms; sp = spiniform projections.

FIGURE 6. Enderleina plagata n. sp. male penial armature. A. Dorsal view. B. Ventral view. Note: ms = median sclerite body; ba = basolateral arms of median sclerite; dp = dorsal projection of basolateral arms of median sclerite; vp = ventral projection of basolateral arms of median sclerite; ne = needle-like structure on the inner side of distal margin of dorsal and ventral projections of basolateral arms; sp = spiniform projections.

FIGURE 7. Enderleina plagata n. sp. female. A. Dorsal habitus. B. Dorsal habitus, with left wings opened.

FIGURE 8. Enderleina plagata n. sp. female. A. Lateral habitus. B. Ventral habitus.

FIGURE 9. Enderleina plagata n. sp. female. A. Head, dorsal view. B. Head, ventral view. C. Head and thorax, lateral view.

FIGURE 10. Enderleina plagata n. sp. female, abdomen, distal region. A. Terga VIII and IX, cercus basal region. B. Sternum VIII (subgenital plate). C. Distal region of sternum VIII and sclerotized band of sternum IX (sternum X slightly displaced).