Anacroneuria izapa Stark & Kondratieff 2004

Mayorga, Alfredo & Barba-Álvarez, Rafael, 2016, Complementary Description Of Anacroneuria Izapa (Plecoptera: Perlidae) From Mexico, Illiesia 12 (7), pp. 31-34 : 31-34

Anacroneuria izapa Stark & Kondratieff 2004

( Figs. 1-6 ) http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org: TaxonName:2031

Anacroneuria izapa Stark & Kondratieff 2004:26 .

Holotype ♂ (Illinois Natural History Survey), Jataté River , San Quintin, Chiapas, Mexico

Material examined. Allotype female: MEXICO: Chiapas, Mpio. Marqués de Comillas , Localidad Chajul, Reserva de la Biosfera Montes Azules ,

Estación Chajul, Rio Lacantún , 16°06’ N, 90°56’ W, 19 March 2013, R. Barba, col. in 80% ethanol deposited in the CNIN ( Colección Nacional de Insectos ) , Instituto de Biologia , UNAM ( IBUNAM), Mexico City. Additional specimens: Same collecting data, 1♂, 5♀, deposited in CNIN .

2b

Adult habitus. Head entirely pale yellow, without dark pigment between ocelli; M-line indistinct, lappets with an irregular hexagon shape divided

and pigmented light brown below and dark brown above ( Figs. 1, 2a, 2b ); circum-antennal ridges connect lappets to anterior margin of eyes in female ( Fig. 2b ). Pronotum with pale, moderately wide mesal stripe; dark brown pigment of discs with scattered small rugose areas. Antennae almost as long as the body length (9-13 mm). Wing membranes transparent, or with a pale amber tint, veins pale brown ( Fig. 1 ).

Fore leg. Surface hairy, covered with fine setae. Trochanter with an asymmetric pale area and a pair of small black spots. Femora generally light brown but with a black basal and a narrow pale distal band. Tibial apex pale, followed by an irregular rectangular black area.

Male. Forewing length 13 mm. Hammer a low thimble with apical diameter subequal to height. Aedeagal apex with a short, fish scale-shaped structure; aedeagus constricted subapically and bearing a small pair of elongate-oval membranous lobes; outer margins of lobes sclerotized and dark ( Fig. 3 ). Hooks slender, typical in appearance; space between hooks forming an antique door lock-shape ( Fig. 3 ); a longitudinal line located on membranous surface between bases of hooks. Dorsal: Aedeagal keel well developed ( Figs. 4-5 ), forming a sclerotized Y-shaped structure ( Fig. 5 ); arms reach anterolateral margins at subapical constriction point; longitudinal line present at midlength.

Female. Forewing length 20-23 mm. Body coloration as in the male. Subgenital plate simple, bilobed with posterior margins truncate; lateral margins of lobes shorter than their width, notch small, shallow and V-shaped ( Fig. 6 ). Mesal field of sternum 9 with scattered fine setae.

Egg. Shape oval with collar end much narrower than micropylar end. General color dark brown, collar button-like. Length ca. 0.45 mm, width ca. 0.21 mm.

Larva. Unknown.

Distribution. Mexico, Chiapas, Municipalities: Marqués de Comillas, 16°06’ N, 90°56’ W (Lacantún River) and Ocosingo, 16°32’ N, 91°29’ W (Jataté River).

Diagnosis. This species shows a close similarity in pronotal pigment pattern to Anacroneuria perplexa Stark 1998 , but A. izapa is lighter in color and larger ( Figs. 1, 2a, 2b ). In addition, the subgenital plate of the female A. perplexa shows a deeper V-shaped median notch and the posterior margins of the lobes are not as straight as in A. izapa .

Comments. The female of this species was associated with the male on the basis of similar body color and adult habitus. The absence of dark pigment between the ocelli may partially account for the difficulty of Stark & Kondratieff (2004) in presenting a complete description of the species from specimens collected in 1935. The specimens used in this study were collected near the type locality in Chiapas. Presently, there are no known records of this species from outside Chiapas.

Figures

Figs. 1-2. Anacroneuria izapa. 1. Adult habitus. 2a. Male head and pronotum. 2b. Female head and pronotum.

Figs. 3-6. Anacroneuria izapa. 3. Aedeagus, ventral. 4. Aedeagus, lateral. 5. Aedeagus, dorsal. 6. Female subgenital plate.