Anacroneuria quadriloba Jewett, 1958

Mayorga, Alfredo, 2016, A New Species Of Anacroneuria Klapálek (Plecoptera: Perlidae) And Complementary Descriptions Of Three Additional Species From Mexico, With Comments On The Current Knowledge Of Mexican Species Of The Genus, Illiesia 12 (12), pp. 64-73 : 69-71

Anacroneuria quadriloba Jewett, 1958

( Figs. 11-16 )

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org: TaxonName:1771

Anacroneuria quadriloba Jewett, 1958:166 . Holotype ♀ ( FMNH), Metlac , Veracruz, Mexico

Material examined. MEXICO: Oaxaca, km 11, carr. Cuicatlán-Sgo. Quiotepec, 17°36´12.46” N 96°35´44” W, 610 m. a.s.l., 12 July 1996, R. Barba, A. Rojas, 1 ♂, 1♀ .

Adult habitus. General body ground color brown ( Fig. 11 ). Head brown medially; pigment pattern extends from occiput, through ocelli and anterior to M-line and lappets; M-line wide and pale, interrupted by a space and continued forward with a brown pattern V-shaped curved; lappets large, brown with small tufts of bristles at the base; brown circum-antennal ridges connect lappets to anterior margin of eyes; darker shading posterior to eyes and clothed with variously sized bristles. Pronotum with pale, narrow band at center, discs patterned with elongate, pale, C-shaped stripes; mediolateral areas of discs with dark rugosities; lateral margins pale, anterior and posterior margins with narrow, dark line ( Fig. 12 ). Wing membranes amber, veins brown, costa transparent and sub-costa darker. Forelegs brown; femora grading from pale to dark banded at apex ( Fig. 11 ).

Male. Forewing length 18 mm. General body color as above. Ventral: aedeagal apex truncate with notched tip; aedeagus constricted subapically and bearing a pair of large membranous lobes covering most of apex and shoulders ( Fig. 13 ); shoulders rounded and sclerotized; hooks typical in appearance, the space between hooks "skeleton-key shaped"; medial processes of hooks forming sharp corners; mediobasal area of hooks with bristles moderate in length ( Fig. 13 ). Lateral: apex rounded frontally and with posterior projection with pointy tip; protuberance at median area and concave at base ( Fig. 14 ). Dorsal: of aedeagus without keel; apex as discussed above; apex divergent ( Fig. 15 ).

Female. Forewing length 23 mm. General body color as above. Subgenital plate 4-lobed with slightly curved, setose posterior borders; lateral margins of lobes same in length as in their width; shallow U-shaped notch at middle of lobes. Sternum 9 without transverse sclerite; dark, mesal sclerite M-shaped with a deep and U- or V-shaped notch at apex, entire structure covered with long hairs; rest of sternum 9 mostly membranous with few hairs ( Fig. 16 ).

Diagnosis. This species is similar in head and pronotal coloration to the recently described A. quetzali Gutiérrez-Fonseca & Springer, 2015 from Costa Rica. However, A. quetzali is overall a larger species, its aedeagus subapex is not constricted, and its apical membranes are smaller than in A. quadriloba .

Distribution. Guatemala, Mexico (Chiapas, Oaxaca and Veracruz), Panama ( DeWalt et al. 2016).

Comments. This species was redescribed by Stark & Kondratieff (2004), but because of the age of the material, only a diffuse pigment pattern was present on the head and pronotum. Examination of fresh specimens revealed a distinctive head and pronotal pattern ( Figs. 11&12 ). The female subgenital plate is illustrated from recently collected specimens ( Fig. 16 ).

Figures

Figs. 11-16. Anacroneuria quadriloba. 11. Male adult habitus. 12. Head and pronotum. 13. Aedeagus, ventral. 14. Aedeagus, dorsal. 15. Aedeagus, lateral. 16. Female subgenital plate.