Anacroneuria suerre Bravo & Romero, 2019

Bravo, Francisco, Romero, David, Gutiérrez-Fonseca, Pablo E. & Echeverría-Sáenz, Silvia, 2019, The description of Anacroneuria suerre sp. nov. from Costa Rica (Plecoptera: Perlidae) and using nymphs in ecotoxicological studies, Zootaxa 4608 (2), pp. 357-364 : 359-362

Anacroneuria suerre Bravo & Romero , sp nov.

Material examined. Holotype ♂: Costa Rica, Limón, upper basin Rio Jimenez , 10° 10’ 24.38” N, 83° 45 ‘7.35” W, 428 masl, 02 February-25 September 2018, F. Bravo & D. Romero (( USNM. Paratypes, same data as holotype: 1♂ MNCR, 1♂ MZUCR, 1♂ LEUNA.

Adult Habitus: General color brownish. Head with a dark brown spot from behind ocelli to M-line in a broad patch covering occiput, extending forward and lateral of callosities in a light brown tone; M-line discontinuous with well-defined limits; lappets brown and mesal field forward of M-line light brown; antennae brown ( Fig. 2A ). Pronotum with lateral dark bands; narrow pronotal stripe brown with a median pale line, bordered by light median region, irregular midlateral strips brown with scattered pale rugosities ( Fig. 2A ). Femora mostly pale distally brown, foreleg tibia and mesothoracic legs mainly yellow with some darkened areas, hind tibia yellowish brown with basal and apical sections darkened, tarsi dark.

Wing membrane brown, veins brown except C and Cs pale. Cerci yellowish with the last four segments dark.

Male. Forewing length 10-12 mm; antennae length 8-9 mm. Hammer thimble shaped, basal diameter slightly wider than at the apex.Aedeagal apex widened at the base, extending forward from broad sinuate shoulders, apically rounded and gradually narrowed forming a scoop; ventral membranous lobes well developed, formed basally by inward folds, aedeagal hooks slender projecting beyond the shoulders ( Fig. 2D ); dorsal keel poorly developed with two widely separated and apically divergent fringes ( Fig. 2F ), lateral view of dorsal keel concave ( Fig. 2E ).

Female. Forewing length 14-15 mm; cerci length 9-10 mm; antennae length 10-11 mm. Subgenital plate with four subequal lobes; external lobes much larger that inner, slightly wider than high; mesal notch deep, V-shaped. Transverse sclerite of sternum nine absent, posterior margin slightly sinuated, mesal sclerite T-shaped scarcely setose and with a marginal patch white and devoid of bristles ( Fig. 2C ).

Comments. The general habitus of the male of A. suerre is most similar to A. chiriqui Stark & Armitage, 2018 described from Panama, but the aedeagal apex of the new species has well-defined subapical membranous lobes, and tibiae and tarsi have yellow markings ( Fig. 2A ). In addition, the lateral lobes in A. chiriqui are longer, curved and extending laterally unlike the new species ( Fig. 2F ); the dorsal aedeagal keel in A. suerre is less conspicuous than in A. chiriqui , and the hammer is shorter, wider and less distinctly thimble shaped. Furthermore, the inner lobes of the subgenital plate of the female adult of A. suerre are more rounded, not acute, as in A. chiriqui ( Fig. 2C ). The new species also resembles the widespread Central American A. lineata (Navas, 1924) , but it has a thimble shaped hammer and lateral view, the dorsal keel of the aedeagus is concave. Adults of A. suerre also differs from both A. chiriqui and A. lineata by having a medial pronotal brown stripe with a medial pale line in both teneral and fully mature specimens ( Fig. 3 ).

Nymph. Body length: 9-10mm. General color brownish in dorsal view, yellow in ventral position. Head brown mainly from ocelli to frontoclypeal region, with lighter areas besides and behind ocelli; “M” line well defined ( Fig. 4A ). Eyes and ocelli dark. Irregular line of setae from dark spots of the base of head to the posterior dorsal region of the eyes. Labrum, labium, right maxillae, and right mandible as in Figs. 4B, 4C, 4D & 4E . Pronotum rectangular with rounded margins, median line pale, with a pale and well-defined pattern. Edge of pronotum with short and fine bristles. Rest of pronotum dark brown, covered by fine, short and dark hairs.

Meso- and metanotum almost alike in color and brown pattern, forming a “v” when mature and pale in apical regions. Median pale spots creating a butterfly-like figure ( Figure 4A ). Rest of meso- and metanotum dark brown, covered by fine, short and dark hairs. Groups of short but width setae are distributed randomly in these structures. Forefemur with a line of 6-7 bristles, close to the front apical area ( Fig. 5A ). Median and hairless line that goes over ¾ of forefemur longitude. Most of forefemur covered by fine, short and dark hairs. Ventral area of coxa as in Fig. 5B .

Comments. The nymph of A. suerre appears most similar to the known nymphs of A. lineata and A. varilla Stark, 1998 , but the “M” line is incomplete and pronotum more rectangular with rounded margins, and not as wide anteriorly.

Etymology. The species name refers to the stream where the specimen was collected, located in the upper basin of Río Jimenez, Limón, Costa Rica. It is used as a noun in apposition.

Figures

FIGURE 2. Anacroneuria suerre sp. n. male-habitus (A) hammer (B), female subgenital plate (C), aedeagus ventral (D), aedeagus lateral (E), aedeagus dorsal (F).

FIGURE 3. Anacroneuria suerre sp. n. pronotal stripe brown with median pale line. Teneral adult specimens (A, B), fully developed specimen (C).

FIGURE 4. Nymph of Anacroneuria suerre sp. n.: Body-dorsal (A), labrum (B), labium(C), right mandible (D) & right maxilla (E).

FIGURE 5. Nymph of Anacroneuria suerre sp. n.: Foreleg (A), ventral area of coxa (B).