Ambrysus totonacus Reynoso, Sites

Reynoso-Velasco, Daniel, Sites, Robert W. & Novelo-Gutiérrez, Rodolfo, 2016, The Ambrysus Stål (Heteroptera: Naucoridae: Cryphocricinae) of Mexico: Revision of the subgenus Syncollus La Rivers, Zootaxa 4126 (1) : -

Ambrysus totonacus Reynoso, Sites , & Novelo NEW SPECIES

( Figs. 4 , 10–11 )

Description. Brachypterous male. HOLOTYPE, length 7.76; maximum width 4.76. Paratypes (n = 10), length 7.04–8.32 (mean = 7.69); maximum width 4.08–4.88 (mean = 4.45). General shape elongate, parallel-sided; widest across embolia ( Fig. 10 A). Dorsal coloration of hemelytra dark brown; head, pronotum, and legs yellowish brown. Dorsal surface coarsely punctate. Ventral coloration of head and thorax medium brown, abdomen with dense golden brown pubescence.

Head. Head length 1.52; maximum width 2.08. Mostly yellowish brown with dark brown stripe at midline becoming wider posteriorly, coarsely punctate. Eyes convergent anteriorly, synthlipsis 0.96; thin band of cuticle along posterolateral margin of eye; eyes not raised above level of vertex or pronotum. Anterior margin between eyes slightly convex, extending anteriorly in front of eyes 9% of head length; posterior margin between eyes strongly convex, extending posteriorly 38% of head length. Labrum width 2.1× length, evenly rounded. Labium with three visible yellowish brown segments, darkening distally, extending 0.42 beyond labrum not including extruded stylets. Antennal proportions 2:5:10:10, length 0.56, extending to near lateral margin of eye, elongate hairs on segment 4 and distal half of 3.

Thorax. Pronotum coarsely punctate, ground color yellowish brown; transverse sulcus marking anterior border of transverse band in posterior 1/4; transverse band pale yellow with color extending anteriorly on midline as elongate, pointed marking; ovoid dark brown mark on either side of midline at anterior margin; dark, broad, submarginal band extending from eye to transverse band; lateral margins dark brown, convergent, posterior half convex, anterior half mostly straight, explanate; posterior margin straight; anterior margin deeply concave between eyes to embrace convex posterior margin of head; posterolateral corners rounded; width 3.1× length; length at midline 1.28; maximum width at posterolateral corners 4.0. Prothorax ventrally pruinose throughout; apices of propleura meeting at midline, closely appressed to prosternellum; propleuron brown throughout, medial 2/3 of posterior margin with elongate golden setae. Probasisternum with sharp medial carina and without row of setae lateral to carina. Prosternellum covered by apices of propleura. Scutellum coarsely punctate, triangular, entirely brown with narrow light brown coloration along margins and midline, width 2.0× length, width 2.68, length 1.32. Hemelytra densely punctate, dark brown, not reaching apex of tergum V, length 5.36 (chord measurement). Clavus with thin, yellow transverse stripe at base, length 4.5× width, length 2.92, width 0.64; claval commissure dark brown, length 0.72. Embolium length 2.28, greatest width 0.54; lateral margin convex, yellow brown in anterior 2/ 3, becoming darker posteriorly. Oblique suture connecting claval and embolar sutures near bases. Hind wings extending to middle of tergum IV. Mesobasisternum midventral tumescence negligible, with sulcus on midline continuing through triangular mesosternellum. Metasternellum (= metaxyphus) transverse, subtriangular, with median carina, apex acute.

Legs. All legs segments yellowish green. Profemur posterior margin with row of tightly arranged setae in basal 2/3, row of short brown spines along middle third, spines generally single proximally becoming small combs of two to five spines distally; anterior margin with dense pad of setae without associated spines. Protibia and tarsus with occlusal inner surface flattened and with spatulate setae; tarsus immovable, one-segmented; pretarsal claw single, minute, triangular. Procoxa with cluster of stout, brown anteromedial spines. Meso- and metacoxae partially recessed into thorax. Meso- and metafemora with row of short, brown spines on anterior margin; spines restricted to basal half on mesofemur, nearly full length of metafemur. Mesotibia with ventrolateral, ventromedial, dorsolateral, and dorsomedial rows of stout reddish-brown spines; ventromedial rows intermixed with combs of two to six spines. Metatibia with ventrolateral, dorsolateral, and dorsomedial rows of stout reddish-brown spines. Meso- and metatibiae with semi-circlet of spines at apex of dorsal and mesal margins; two comb rows of stout spines near apex of ventral margin, lateral margin without spines at apex to accommodate flexed tarsus. Meso- and metatibiae and metatarsus with long, pale swimming hairs; hairs profuse on metatibia and -tarsus. Meso- and metapretarsi with paired claws slender, gently curved, with small basal tooth. Leg measurements as follows: foreleg, femur 2.2, tibia 1.88, tarsus 0.40; middle leg, femur 2.2, tibia 1.96, tarsomeres 1–3, 0.24, 0.32, 0.48; hind leg, femur 2.60, tibia 2.88, tarsomeres 1–3, 0.20, 0.52, 0.56.

Abdomen. Dorsally with connexiva III–VIII exposed, each laterotergite brown in anterior half and yellow in posterior half giving checkered appearance ( Fig. 10 A); lateral margin finely serrate, marginal row of short yellow setae, group of trichobothria near posterolateral corners. Posterolateral corners of II (visible ventrally) –IV narrowly rounded to right angled and not spinose, V–VII bluntly acute. Accessory genitalic process of tergum VI short, curved to right at approximately 80 degrees, dilated distally ( Fig. 10 B). Medial lobes of tergum VIII (pseudoparameres) short, wide, subrectangular, symmetrical, posterior margin straight; posterolateral corners more heavily sclerotized, nearly right-angled, slightly deflexed ventrad ( Fig. 10 C). Ventrally entirely golden brown, with dense pile of fine hairs. Lateral margin with thin, glabrous band. Glabrous rounded to oval patches around spiracles on laterosternites II–VII. Phallosoma elongate, linear, constricted basally, sclerotized dorsally; right and left ventral lobes of endosoma papillose, lightly sclerotized ( Fig. 10 E). Parameres symmetrical, longer than wide, mesal margin straight, narrowly rounded anteriorly, row of long dark setae emanating from middle of dorsal surface. Proctiger short, length 0.6× width. Pygophore with elongate setae sparsely distributed over most of surface, with thick brush of elongate setae on posterior margin ( Fig. 10 D).

Brachypterous female. Paratypes (n = 10), length 7.84–9.04 (mean = 8.22); maximum width 4.40–5.28 (mean = 4.76). Similar to male in general structure and coloration except as follows: Hemelytra surpassing posterior margin of tergum VI. Mediosternite VII (subgenital plate) width 1.2× length; length at midline 1.02; maximum width 1.30; posterior margin concave; two short, pointed lobes near center of concavity; posterolateral corners rounded, produced posteriorly further than medial lobes ( Fig. 10 F).

Macropterous male. Unknown.

Macropterous female. Paratype (n = 1), length 8.48; maximum width 4.80. Coloration, setation, pronotum proportions, posterolateral corners of pronotum, scutellum proportions, embolium length generally same as for brachypterous female. Otherwise clavus and claval commissure correspondingly longer: Clavus length 6.33× width, length 3.08, width 0.60; claval commissure length 0.80. Hind wings extending to posterior margin of tergum VI.

Variation. The yellowish brown coloration reported here is green or yellowish green in live specimens or specimens that were dry-killed, pinned soon thereafter, and kept in darkness ( Fig. 10 A). Specimens can present the transverse band on the pronotum with pale yellow coloration in the anterior half and brown posteriorly. The posterolateral corners of the subgenital plate can be slightly pointed.

Diagnosis. This species presents a characteristic color pattern on the prothorax with two dark, broad, submarginal bands. The flat and subrectangular shape of the male pseudoparameres is different from that of any other species in this subgenus in Mexico. Although the subgenital plate is similar to that in some females of A. circumcinctus , the pointed central lobes are distinctive for this species.

Habitat description. Río Tizapam is a small stream that originates on the eastern slope of the Sierra Madre Oriental (Veracruz). The river is part of the Río La Antigua Basin that drains to the Gulf of Mexico. At the type locality the river is small with boulders and cobble ( Fig. 11 ). Most of the collecting was conducted in areas with current and among the roots of riparian vegetation.

Distribution. In central Veracruz, this species is distributed in rivers of the Río La Antigua Basin, an area that is a transition zone between the Transmexican Volcanic Belt and the Sierra Madre Oriental biogeographic provinces. The northern distribution of the species in the states of Hidalgo and Puebla is on the eastern slopes of the highlands forming the Sierra Madre Oriental biogepgraphic province ( Fig. 4 ). We found A. totonacus and A.

circumcinctus syntopically in the states of Hidalgo (L-1522) and Veracruz (L-1290, L-1296, L-1549). Also, we found A. totonacus and A. xico n. sp. at the same locality in the state of Veracruz (L-1557).

Etymology. The specific epithet refers to the Totonac culture of the Totonacapan region, which originally included parts of the east-central Mexican states of Hidalgo, Puebla, and Veracruz, the states where this species occurs.

Repositories. The holotype and some paratypes will be deposited in the Colección Nacional de Insectos ( Mexico City); additional paratypes will be deposited in the Colección Entomológica del Instituto de Ecología A.C. (Xalapa), Enns Entomology Museum (University of Missouri), and the United States National Museum of Natural History (Washington D.C.).

Type material examined (brachypterous unless otherwise noted). HOLOTYPE ♂: MÉXICO: VERACRUZ: Mpio. Xico , [Río Tizapam], 1.86 km SW of Xico , 19° 24' 26.7'' N, 97° 00' 53.5'' W, 1300 m, 16 June 2013, L-1559 / Sites, Shepard, Novelo, Reynoso-Velasco & Reynoso-Hernández; PARATYPES: same data as holotype (1³, 2♀ UMC). HIDALGO: Mpio. Tlanchinol, 3.4 km W of Chalchocotipa, road to Santa Maria Catzotipan, 0 6 June 2013, L-1522 / west of Hwy 105, km 3+ 400, 528 m, 21° 02' 36.4'' N, 98º 36' 00.8'' W, Shepard, Sites, Reynoso-Velasco & Reynoso-Hernández (1♂, 1♀ UMC). PUEBLA: Cuetzalan, El Cuichat, 870 m, 12-Jul-2007, R. Novelo col. (3♂, 5♀ UMC). VERACRUZ: Mpio. Coatepec, Agua Alegre, Río Huehueyapan, 4 April 2011, L-1290, colls. R. Sites & V. Amaya / elev. 1198 m, 18 [19º] 26.884' N, 96 58.867' W (1³, 2♀ CNIN; 1³, 2♀ IEXA; 1³, 2♀ UMC); Coatepec, Arroyo Bola de Oro, 7-Nov-2009, R. Novelo col. (1³ CNIN; 1³ IEXA; 4³, 3♀ UMC; 1³, 1♀ USNM); Coatepec, Río Huehueyapan, 04-Apr-2011, R. Novelo col. (1³, 3♀ UMC; 1³, 1♀ USNM); Coatepec, Consolapa, Río Pixquiac (in riffles), 15-May-2004, R. Novelo col. (2³, 5♀ UMC); Mpio. Atzalán, Pte. Tomata, Río Alseseca, 19° 55' 15.7'' N, 97° 13' 28.2'' W, 514 m, 13-Jun-2013, L-1549 / rock, gravel, riffles, and marginal veg., Sites, Shepard, Novelo, Reynoso-Hernández & Reynoso-Velasco, colls. (3♀ UMC); Mpio. Atzalán, Pte. Tomata, Río Alseseca, 6 April 2011, L-1296 / 500 m, 19° 55.335' N, 97° 13.385' W, Sites, Shepard, Amaya & Novelo colls. (1♀ macropterous UMC); Mpio. Xico , Arroyo Avestruces, vegetated margin of rocky stream in cattle pasture, 16-Jun- 2013, L-1557 / 1401m, 19° 23' 53.8'' N, 97° 02' 29.9'' W, Sites, Shepard, Novelo, Reynoso-Hernández & Reynoso- Velasco, colls., (3³, 1♀ UMC); Mpio. Xico , Arroyo Avestruces, 1395 m, 29-May-2014, L-1799 / 19° 23' 53.8'' N, 97° 02' 29.9'' W, Reynoso-Velasco & Reynoso-Hernández (1♀ UMC).

Figures

FIGURE 4. Distribution of Ambrysus baeus, A. chiapanecus n. sp., A. totonacus n. sp., A. pygmaeus, and A. xico n. sp. in Mexico (topographic map modified from Mexico map relief by Carport and used under CC BY 3.0).

FIGURE 10. Structures of Ambrysus totonacus n. sp. (A) dorsal habitus of holotype, (B) 6 th and 7 th abdominal terga of male, (C) 8 th abdominal tergum of male, (D) genital capsule of male (phallosoma removed), (E) ventral side of phallosoma, (F) 6 th abdominal sternum and subgenital plate of female (terminal segments removed). Size bar = 0.5 mm and applies only to Figs. D and E.

FIGURE 11. Type locality of Ambrysus totonacus n. sp. at Río Tizapam (Veracruz, México).