Limnocoris chaetocarinatus 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 : 456-460

publication ID	https://doi.org/ 10.11646/zootaxa.4629.4.1
publication LSID	lsid:zoobank.org:pub:0DB18F90-AAFD-4FB7-B1ED-09A86A707C9F
persistent identifier	https://treatment.plazi.org/id/03E58815-E939-FFBF-FF61-F152FAC85CAB
treatment provided by	Plazi
scientific name	Limnocoris chaetocarinatus Rodrigues & Sites
status	sp. nov.

Treatment

Limnocoris chaetocarinatus Rodrigues & Sites NEW SPECIES

( Figs. 1D View FIGURE 1 , 3 View FIGURE 3 , 6 View FIGURE 6 A–B, 20A)

Description. Female. hindwings brachypterous. HOLOTYPE, length 7.52; maximum width 5.36. Paratypes (n = 9), length 7.20–7.92 (mean = 7.48); maximum width 5.20–5.84 (mean = 5.44). General shape rounded to oval; widest across posterior region of embolia. Overall dorsal coloration light brown, mottled on head, pronotum and corium; hemelytral membrane dark brown. Dorsal surface with fine granulations and punctate throughout. Ventral coloration brownish.

Head. Head length 1.20; maximum width 2.48. Mostly brownish with brown median markings becoming wider posteriorly, punctate. Synthlipsis 1.24; thin band of cuticle along anterolateral margin of eye; eyes not raised above level of vertex or pronotum. Anterior margin between eyes shallowly convex, extending anteriorly 13% of head length; posterior margin between eyes not extending posteriorly. Maxillary plate tumescent anteriorly. Labrum pentagonal, width 1.1× length, distolateral margins converging to apex ( Fig. 3D View FIGURE 3 ). Labium with three visible yellowish brown segments, extending 0.44 beyond labrum not including extruded stylets. Antenna 4-segmented, length 0.64; not exceeding lateral margin of eye; pedicel subquadrate; flagellomeres slender, with long setae, not partially fused. Posteroventral margin of head swollen, but without postgenal tubercle.

Thorax. Pronotum ground color light brown; major brown markings on rectangular area behind eyes; other smaller brown markings near mid-lateral area; slight transverse sulcus marking anterior border of transverse band in posterior 1/4; anterior margin straight between eyes; lateral margins convergent anteriorly, evenly convex; posterior margin almost straight, shallowly concave medially; posterolateral corner roundedly acute ( Fig. 3A View FIGURE 3 ); greatest width 3.3× length at midline; length at midline 1.44; maximum width at posterolateral corners 4.80. Prothorax ventrally brownish. Propleura with pubescent area not extended posteriorly on lateral margin ( Fig. 1D View FIGURE 1 ); elongate golden setae concentrated near proacetabulum; posterior margin convex at mid-length ( Fig. 1D View FIGURE 1 ); posteromesal corner near prosternellum slightly deflexed ventrally. Median carina of probasisternum with a bifid tubercle anteriorly in lateral view. Scutellum triangular, punctate, and tuberculate; dark brown, lighter on anterolateral corners; width 2.72, length 1.24. Hemelytra length 5.52 (chord measurement), punctate and tuberculate, brown to light brown, small dark brown markings throughout, dark brown along costal margin to membrane. Membrane dark brown and mottled. Embolium greatest width 0.74, lateral margin convex, light brown in anterior 3/4 and slightly darker posteriorly. Hindwings reduced. Region between mesobasisternum and mesoepisternum with longitudinal row of elongate golden setae ( Fig. 3D View FIGURE 3 ). Mesosternal carina with anterior projection developed; lateral margin of carina with dense tuft of elongate golden setae; fossa narrow, shallow, and elongate. Metasternal carina narrow and elongated, acuminate posteriorly, excavated on posterior margin in lateral view ( Fig. 3F View FIGURE 3 ). Metapleuron covered with elongated golden setae on posterior region.

Legs. All legs segments light brown, except blackish distal part of tarsomere III of middle and hind legs. 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. 3B View FIGURE 3 ). 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 lengths as follows: fore leg, femur 1.72, tibia 1.04, tarsus 0.36; middle leg, femur 1.92, tibia 1.28, tarsomeres 1–3, 0.10, 0.28, 0.42; hind leg, femur 2.54, tibia 2.36, tarsomeres 1–3, 0.14, 0.64, 0.66.

Abdomen. Dorsally with narrow lateral margins of terga III–VIII exposed ( Fig. 3A View FIGURE 3 ); terga III–VI brown, darker anteriorly; lateral margin serrate; marginal row of short yellow setae and group of trichobothria near posterolateral corners. Posterolateral corners of II (visible ventrally) –V narrowly rounded to right angled and not spinose, VI produced posteriorly, VII–VIII acuminate. Sterna brownish; elongated golden setae generally dispersed, concentrated next to midline of sterna III–V; sternum II with sinuous row of golden setae. Subgenital plate width 0.9× length; length at midline 1.16; maximum width 1.08; lateral margins sinuate with concavity in posterior half, with elongate golden setae at mid-length; posterior margin rounded ( Fig. 3E View FIGURE 3 ).

Male—hindwing brachypterous. Paratypes (n = 9), length 7.36–8.08 (mean = 7.68); maximum width 5.28– 6.00 (mean = 5.57). Similar to female in general structure and coloration, except as follows: Abdominal tergum VI asymmetrical, with lateral lobe evenly curved; accessory genitalic process poorly developed; posterior margin with small notch on left side ( Fig. 6A View FIGURE 6 ). Posterior margin of mediotergite VII with four rounded lobes; mesal margin of laterotergite VII slightly convex ( Fig. 6A View FIGURE 6 ). Lateral lobe of tergum VIII shallowly concave in anterior half of lateral margin; medial lobes asymmetrical, left lobe angled laterally at apex, apical margin truncate; right lobe twisted in distal half ( Fig. 6B View FIGURE 6 ).

Male—hindwing macropterous. Paratype (n = 1), length 8.16; maximum width 5.52. Similar to brachypterous male in general structure and coloration, except as follows: posterolateral corners of pronotum rounded. Claval and intraclaval sutures of hemelytra distinct ( Fig. 3C View FIGURE 3 ).

Diagnosis. This species presents elongate golden setae on the mesosternal carina that are not present in any other North American species of Limnocoris ( Figs. 3D, F View FIGURE 3 ). Some specimens that we examined contained debris attached to the setae, hindering the visualization of the character. In addition, L. chaetocarinatus n. sp. can be identified by the following set of characters: distal margin of labrum almost rounded ( Fig. 3D View FIGURE 3 ); propleuron with the pubescent area not extended posteriorly on lateral margin ( Fig. 1D View FIGURE 1 ); mesosternal carina elongate, narrow, with subparallel lateral margins ( Fig. 3D View FIGURE 3 ); and female subgenital plate lateral margins sinuate with the posterior margin rounded. ( Fig. 3E View FIGURE 3 ).

Comparative notes. This new species is morphologically similar to L. pallescens . Both species have similar body measurements and shape of the meso- and metasternal carinae. However, in addition to the presence of elongate setae on the mesosternal carina, L. chaetocarinatus n. sp. also differs in the shape of the male lateral lobe of tergum VI, which has the mesal margin evenly curved, whereas it is almost straight in L. pallescens .

Distribution. This species is distributed from northern Costa Rica (Alejuela Province) to northern Colombia (Sucre Department), including the central region of Panama (Coclé and Panama provinces). It is known from elevations of sea level to 781 meters. This is the first species of Naucoridae recorded from both North and South America. We did not perceive any significant morphological differences in populations from both continents; thus, we consider this material to be conspecific.

Etymology. The specific epithet chaeto -, latinized form of Greek khaite (=hair, haired) and carinatus, Latin (= keeled, carinate) refers to the elongate golden setae on the mesosternal carina.

Type material examined. HOLOTYPE, brachypterous ♀: PANAMA, Panama, Canal Zone , small stream at km. 11 on Pipeline Road, sea level, 5 Jan. 1993, CL2787, J.T. Polhemus ( UMC) . PARATYPES: same data as holotype (2♂, 3♀ brachypterous, UMC) ; same data as holotype but with J.T. Polhemus Collection 2014, C.J. Drake Accession (3♂, 5♀, all brachypterous, USNM) . Coclé, El Copé National Park , stream, 05–06.VI.2008, 08°39’51. 4”N / 80°35’28.2”W, AS-08-014, A.E.Z. Short (3♂, 1♀, all brachypterous, UMC) GoogleMaps ; Parque Nacional Omar Torrijos, Rio Guabal , 750 m, 8/10/2004, pool, coll C. Colón-Gaud (3♂ brachypterous, UMC) ; same locality except 8°40’N, 80°35’W, 11 July 2002, coll A. Ranvestel (2♂ brachypterous, UMC) GoogleMaps . COLOMBIA, Sucre, Toluviejo , arroyo Bobo, N 9°33’48.711”, W 75°24’39.621”, altura 32 m, fecha 18/III/2017, collector Wendy Molina-J. (1♂ brachypterous, 3♀ macropterous, MZUSP) . COSTA RICA, Alajuela, Orotina , IV.20.12, Mus. Expd., S. Meck col., Field Mus. Coll. Limnocoris pallescens Stal , det J.T. Polhemus, J.T. Polhemus Collection 2014, C.J. Drake Accession (1♂ bra- chypterous, USNM) ; San Mateo, R. Surubres, alt 250 m, Feb.1905, P. Biolley collector, J.R. de la Torre-Bueno Collection K.U., pusillus Mont?, J.T. Polhemus Collection 2014, C.J. Drake Accession (1♂ macropterous, USNM) .