Limnocoris zacki Rodrigues & Sites, 2019

Rodrigues, Higor D. D. & Sites, Robert W., 2019, Revision of Limnocoris (Heteroptera: Nepomorpha: Naucoridae) of North America, Zootaxa 4629 (4), pp. 451-497 : 489-494

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Limnocoris zacki Rodrigues & Sites


Limnocoris zacki Rodrigues & Sites NEW SPECIES

( Figs. 1A View FIGURE 1 , 2B, 2D View FIGURE 2 , 18 View FIGURE 18 , 19 View FIGURE 19 G–H, 20B)

Description. Male—hindwing brachypterous. HOLOTYPE, length 5.84; maximum width 4.24. Paratypes (n = 10), length 5.68–6.32 (mean = 6.07); maximum width 4.16–4.40 (mean = 4.28). General shape rounded to oval; widest across posterior region of embolia. Overall dorsal coloration brown to dark brown, hemelytral membrane slightly darker, mottled on head, pronotum, and hemelytra ( Fig. 18A View FIGURE 18 ). Dorsal surface with fine granulations and punctate throughout. Ventral coloration brown to dark brown.

Head. Head length 1.22, maximum width 2.04. Mostly medium brown with posterior region dark brown, punctate ( Fig. 18A View FIGURE 18 ). Synthlipsis 1.08; eyes not raised above level of vertex or pronotum. Anterior margin between eyes convex, extending anteriorly 19% of head. Maxillary plate tumescent anteriorly. Labrum width 1.2× length, distolateral margins convergent to broadly rounded apex. Labium with three visible brownish segments, darkening distally, extending 0.32 beyond labrum not including extruded stylets. Antenna, length 0.46; not exceeding lateral margin of eye; pedicel quadrate; flagellomeres slender, partially fused, with long setae. Postgenal tubercle on posteroventral midline.

Thorax. Pronotum ground color brown, rectangular area behind eyes darker, lateral margins light brown; other smaller dark brown markings generally dispersed; transverse sulcus marking anterior border of transverse band in posterior 1/4; anterior margin concave between eyes; lateral margins convergent anteriorly, evenly convex; posterior margin almost straight, shallowly concave medially; posterolateral corner rounded ( Fig. 18A View FIGURE 18 ); greatest width 3.3× length at midline; length at midline 1.14; maximum width at posterolateral corner 3.78. Prothorax ventrally dark brown medially, light brown laterally ( Fig. 18B View FIGURE 18 ). Propleuron with pubescent area distinctly extended posteriorly along lateral margin; posterior margin straight ( Fig. 1A View FIGURE 1 ); posteromesal corner near prosternellum deflexed ventrally. Probasisternum with median carina bilobate in lateral view, and divided in two posteriorly. Scutellum punctate; triangular; reddish brown, darker at anterolateral corners, light brown on posterior corner; width 2.00, length 1.00. Hemelytra punctate, brown to dark brown, with darker and lighter markings throughout, mostly on corium; membrane darker and mottled ( Fig. 18A View FIGURE 18 ); length 4.44 (chord measurement). Embolium greatest width 0.58, lateral margin convex, light brown in anterior 3/4 and brown posteriorly. Hindwings reduced. Region between mesobasisternum and mesoepisternum without longitudinal row of elongate golden setae. Mesosternal carina with median ridge between anterior projection and fossa increasing in size to acute projection at anterior end of fossa ( Fig. 18E View FIGURE 18 ); fossa partially open anteriorly, shape roundedly quadrate to oval ( Fig. 18C View FIGURE 18 ). Metasternal carina with fossa oval to teardrop-shaped, slightly depressed medially ( Fig. 18C View FIGURE 18 ); posterior margin excavated in lateral view ( Fig. 18E View FIGURE 18 ).

Legs. All legs segments medium brown to light brown, except dark brown apical part of tarsomere III of middle and hind legs ( Fig. 18B View FIGURE 18 ). Procoxa with cluster of stout, brown anteromedial spines. Profemur anterior margin with dense pad of setae without associated spines, posterior margin with row of short brown spines along basal half. Protibia and tarsus with occlusal inner surface flattened; tarsus one-segmented, immovable; pretarsal claw single, minute, triangular. Meso- and metacoxae partially recessed into thorax ( Fig. 18B View FIGURE 18 ). Meso- and metafemora with row of short, brown spines on anterior margin. Meso- and metatibiae with ventrolateral, ventromedial, dorsolateral, and dorsomedial rows of stout brownish spines; meso- and metatibiae with two transverse rows of spines distally, one on lateral and another on mesal margins. 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 minute basal tooth. Leg measurements as follows: fore leg, femur 1.48, tibia 1.00, tarsus 0.38; middle leg, femur 1.62, tibia 1.20, tarsomeres 1–3, 0.12, 0.30, 0.41; hind leg, femur 2.06, tibia 2.08, tarsomeres 1–3, 0.12, 0.70, 0.68.

Abdomen. Dorsally with lateral margins of terga III–VIII exposed; terga III–V dark brown anteriorly, light brown posteriorly ( Fig. 18A View FIGURE 18 ); marginal row of short yellow setae, and group of trichobothria near posterolateral corners. Lateral margin of abdomen with minute serration. Posterolateral corners of II–V narrowly rounded to right angled, not spinose. Sterna brown ( Fig. 18B View FIGURE 18 ), covered by golden pubescence, without generally dispersed elongate golden setae; sternum II with irregular patch of elongate golden setae. Mediotergite VI with accessory genitalic process poorly developed ( Fig. 19G View FIGURE 19 ). Mediotergite VII posterior margin with rounded, inconspicuous posterolateral corners and a rounded central lobe; lateral lobe with lateral margins parallel, posterior margin rounded ( Fig. 19G View FIGURE 19 ). Lateral lobe of tergum VIII with lateral margin shallowly concave in anterior half; left medial lobe angled laterally at apex, with distal margin truncate; right medial lobe twisted in distal third; mediosternite VIII with medial notch on posterior margin ( Fig. 18B View FIGURE 18 ).

Female—hindwing brachypterous. Paratypes (n = 10), length 5.88–6.56 (mean = 6.16); maximum width 4.24–4.64 (mean = 4.42). Similar to male in general structure and coloration, except as follows: Abdominal tergum VI symmetrical. Subgenital plate width 1.02× length; length at midline 0.82; maximum width 0.84; lateral margins converging in apical 3/4 to broadly rounded apex, without tuft of elongate golden setae at mid-length ( Fig. 18D View FIGURE 18 ); laterosternite VII acuminate posteriorly; laterosternite VIII with posterior margin truncate to convex.

Diagnosis. Specimens of L. zacki n. sp. are small, measuring 5.84–6.56. The pubescent area of the propleuron is distinctly extended posteriorly along the lateral margin and the posterior margin of the propleuron is straight at mid-length ( Fig. 1A View FIGURE 1 ). The mesosternal carina has a distinct projection between the anterior projection and fossa, and a small aperture at the anterior region of the fossa. The male abdominal mediosternite VIII has a medial notch on the posterior margin.

Comparative notes. Limnocoris zacki n. sp. is similar to L. insularis , L. lutzi , and L. nanus n. sp. These species are similar in size and morphology, including the pubescence pattern of the ventral surface. The primary character to distinguish among these species is the mesosternal carina; L. zacki is unique with a distinct projection between the anterior projection and fossa, and a small aperture at the anterior region of the fossa.

Distribution. This species is distributed from southern Mexico (Chiapas) to northwestern Guatemala (Huehuetenango and Suchitepequez) ( Fig. 20B View FIGURE 20 ). It probably also occurs in El Salvador and Honduras. Additional field surveys in these countries are needed.

Etymology. The specific epithet honors the American entomologist Richard S. Zack (Washington State University), who has conducted extensive fieldwork in Guatemala and kindly made specimens available to us for study.

Type material examined. HOLOTYPE brachypterous ♂: MEXICO, Chiapas, Mpio. Ángel Albino Corzo, Jaltenango, Río Jaltenango ( Río Lagartero ), 6 January 2012, 605 m, 15°52’33.7”N / 92°43’53.4”W, riffles & marginal vegetation, D. Reynoso-Velasco, L-1313 ( UMC) GoogleMaps . PARATYPES: same data as holotype (1♂, 6♀, UMC; 1♀, MZUSP—all brachypterous); same but 7 January 2012, L-1314 (10♂, 9♀, UNAM; 10♂, 8♀, all brachypterous, 1♀ macropterous, IEXA); Km 30 fm Jaltenango to Siltepec , Plan de Ayutla , El Plan de Río Ayutla , 19 May 2012, 846 m, 15°42’23.6”N / 92°34’43.7”W, D. Reynoso-Velasco, L-1346 (1♂, 3♀, all brachypterous, UMC) GoogleMaps . GUATEMALA, Huehuetenango, Dept. Rio Nenton ca 8 Km NE of La Laguna, 10 May 2013, 15.79915°N / 91.88951°W, 613 m, R.S. Zack collector (1♂, 1♀, UMC; 1♂, MZUSP; 1♂, 2♀, WSU—all brachypterous) GoogleMaps . Suchitepequez, District Finca los Tarrales ca 12 Km N of Patulul, 6 June 2005, 14°31’37”N / 91°08’17”W, 750 m, small stream, R.S. Zack coll (1♂ macropterous, UMC) GoogleMaps .


Universidad Nacional Autonoma de Mexico


Museu de Zoologia da Universidade de Sao Paulo