Cataractocoris marginiventris Usinger

Sites, Robert W., Reynoso-Velasco, Daniel & Novelo-Gutiérrez, Rodolfo, 2013, Revision of the Mesoamerican Genus Cataractocoris Usinger (Hemiptera: Heteroptera: Nepomorpha: Naucoridae), Zootaxa 3682 (3), pp. 475-484 : 479-480

Cataractocoris marginiventris Usinger

Figs. 6–9 , 15 b

Cataractocoris marginiventris Usinger 1941 : Ann. Ent. Soc. Am. 34: 13–14.

Discussion. In the original description, this species was distinguished by Usinger (1941) from C. macrocephalus by straight lateral margins of the pronotum, shorter and proportionately broader profemora, alternating light and dark coloration of the connexivum, and a wide glabrous band surrounding the venter. We have found that some of these features are variable among populations and that a combination of these and other attributes are necessary to adequately characterize the species and enable identification. Although most specimens have unambiguously straight lateral margins of the pronotum, occasional individuals are clearly concave, especially in the anterior half. The checkered appearance of the connexivum in some specimens can be subtle. The discovery of a third species further confounds identifications because it is closest in appearance to C. marginiventris .

Usinger (1941) reported this species to occur in very fast water in which it was difficult to hold a net. We collected this species in similar habitats of large rocks in fast current, on the vertical rock faces of powerful waterfalls, some of which were covered with moss and algae, and on gentle spillways (e.g., L-1392, 1393). An atypical habitat was encountered when a series of specimens was collected from a vertical metal gate in a dam at site L-1481. The metal gate was wet because water was leaking from around the perimeter and algae were present.

Diagnosis. This species can be distinguished from C. macrocephalus by the wide, yellow, glabrous marginal band on the venter; its width at the widest point on the propleuron ranged from 0.64 to 0.92 mm (mean 0.76 ± 0.01), which overlaps with that of C. shepardi . Males can be distinguished from those of C. shepardi by the rounded midline of the pygophore between the parameres ( Fig. 9 ) and the pointed distolateral corners of the pseudoparameres (median lobes of tergum VIII) ( Fig. 8 ). In females, ventral laterotergite VII is deeply incised distally and at least the apex tends to be deflexed so that it is oriented nearly vertically ( Fig. 7 ), in contrast to that of C. shepardi which is not incised and angled no greater than 45 degrees ( Fig. 12 ). Females of both species can be distinguished from those of C. macrocephalus by the apical margin of the subgenital plate with the row of dense hairs more prominent on each side of the midline, rather than continuous across the margin.

Distribution. We have collected this species on both sides of the Central Mexican Plateau from Jalisco and Veracruz south to Chiapas, and we have examined specimens from Guatemala ( Fig. 15 b). We report the first records of this species and genus from the Mexican states of Michoacán, Morelos, Puebla, Oaxaca, and Veracruz, and the Guatemalan department of Escuintla. Usinger (1941) previously reported C. marginiventris from Guerrero.

Type material examined. HOLOTYPE: MEXICO: [State of México]: Temescaltepec, VI-5-33 / H.E. Hinton, R.L. Usinger Collectors / HOLOTYPE Cataractocoris marginiventris R. L. Usinger / California Academy of Sciences Type No. 4974 (3, CAS). PARATYPES: same data as holotype / PARATYPE marginiventris Usinger (13, 6Ƥ, EMEC; 13, 1Ƥ, CAS).

Other material examined. GUATEMALA: Baja Verapaz Dept.: Los Encuentros, 25 June 1966, Flint & Ortiz (1Ƥ, USNM). MÉXICO: Chiapas: Velo de Novia waterfall, near Las Hermanas bridge, 15º 55' 11.3'' N, 93º 29' 45.9'' W, 144 m, 21 May 2012, D. Reynoso-Velasco, L-1359 (63, UMC). Guerrero: km 7 Taxco-Ixcateopan, 17-VI-87, E. Barrera (13, UNAM); 26 km NW El Paraiso, 1800 m., 8 Aug 1986, R. Davidson, J. Rawlins / Carnegie Museum (13, 3Ƥ, CMNH); same locality, 9 Aug 1986 (1Ƥ, CMNH). Jalisco: Rio Las Juntas y los Verranos at los Verranos waterfall, 18 February 1999, R. W. Sites, L-238 (73, 13Ƥ, 19 nymphs, UMC); Rio Mismaloya at Mismaloya, 18 February 1999, gravel/rocky stream, R. W. Sites, L-237 (53, 2Ƥ, UMC); Rio Tomatalan waterfall, Boca de la Tomatalan, 18 February 1999, R. W. Sites, L-236, (23, 2Ƥ, 7 nymphs, UMC); 5 mi. W. Plan de Barrancas, VII-21-1954, J.W. MacSwain / in spring water on steep hillside (1Ƥ, EMEC); Rio Guapinole, 1.3 rd. km E Las Juntas Verano - Las Juntas del Tuito, 17 Jan. 2005, C.B. Barr / 20°26.67' N, 105°16.45' W (43, 3Ƥ, EMEC); same data, W.D. Shepard leg. (1Ƥ, EMEC); 9.2 km Tacotán, 10 Jan 2005, 1250', Rio de Tepospisaloya / W.D. Shepard leg. (13, EMEC). State of México: Mpio. Donato Guerra, El Pericón, El Pericón River (spring), 19º18'14.7'' N, 100º15'50.2'' W, 2061 m, 21-DEC-2012, D. Reynoso-Velasco, L-1466 (1Ƥ, UMC); Temescaltepec, VII-1934 / H.E. Hinton (53, 2Ƥ, EMEC); same locality, VI-5-1933 / R. L. Usinger Collector (2 nymphs, EMEC); same locality, VI-21-1933 / H.E. Hinton, R.L. Usinger Collectors (1Ƥ, EMEC); same locality, 5 June 1933, H.E. Hinton, R.L. Usinger, Cal. Acad. Sci. Coll. / Ira La Rivers Collection, Bequeathed to the California Academy of Sciences Collection - 1978 (23, 1Ƥ, CAS); Real de Arriba, Temescaltepec, VII-13-33 / H.E. Hinton, R.L. Usinger Collectors (1Ƥ, EMEC); same locality, 19o 02.165' N, 99 o 59.669' W, elev 1913 m, 9 Nov. 2009, L- 1128, R. W. Sites & L. Cervantes (13, UMC); same locality, 19º02'30.6'' N, 100º00'24'' W, 1888 m, 19 Dec. 2012, D. Reynoso-Velasco, L-1458 (63, 11Ƥ, UMC); Tejupilco, Temescaltepec, VII- 1934, H.E. Hinton (13, 3Ƥ, EMEC); same locality, VI-19-1933 / H.E. Hinton, R.L. Usinger Collectors (13, EMEC), same locality, 15 June 1933, Robert L. Usinger, Cal. Acad. Sci. Coll. / Ira La Rivers Collection, Bequeathed to the California Academy of Sciences Collection - 1978 (23, CAS). [Morelos]: Cuernavaca, 1934, H.E. Hinton (1Ƥ, EMEC). Michoacán: Pedernales, Arroyo Frio, 19-IX-87, Col. E. Barrera V. / Colección del Instituto de Biologia, UNAM, México D.F. (13, 1Ƥ, UNAM); Cañada “El Colorín”, nr. La Nuez Village, 11 July 2006, coll: R. Novelo / torrential stream in ravine, 1050 m asl, 18°39.540' N, 103°24.570' W (13, UMC); same data, 9 Nov. 2005 (13, UMC); Mpio. Buenavista Tomatlán, Buenavista Tomatlán, 19º 12' 57.8'' N, 102º 34' 30.2'' W, 440 m, 24 Dec. 2012, D. Reynoso- Velasco, L-1481 (53, 4Ƥ, UMC). Oaxaca: km 84 carr. Tuxtepec-Oaxaca, predio Santiago Comaltepec, 17º 35' 35.5'' N, 96º 22' 57.8'' W, 161 m, 24 May 2012, D. Reynoso-Velasco, L-1372 (13, UMC); Mpio. Santa Maria Zacatepec, 1 km S of Santa Maria Zacatepec, San Miguel bridge, 16º 44' 10.1'' N, 97º 59' 33.3'' W, 328 m, 29 May 2012, D. Reynoso-Velasco, L-1392 (23, 3Ƥ, UMC); km 189 carr. Sta. Maria Zacatepec-Putla, S of El Tapanco, 16º 47' 28.3'' N, 97º 59' 20.4'' W, 341 m, 29 May 2012, D. Reynoso-Velasco, L-1393 (23, 2Ƥ, UMC). Puebla: carr. Atotocoyan-Mazatepec, 19º 59' 04'' N, 97º 25' 37.6'' W, 804 m, 0 3 June 2012, waterfall, D. Reynoso-Velasco, L- 1411 (43, 4Ƥ, UMC). Veracruz: Cascada de la Monja at Xico, Texolo, 4 April 2011, L-1291, rock face of waterfall / 1259 m, 18° 24.024' N, 96° 59.874' W, colls: Sites, Shepard, Amaya & Novelo (23, 4Ƥ, 49 nymphs, UMC); 4 km N of Sontecomapan, 2 April 2011, small, shallow, high velocity strm. w/ boulders / 93 m, 18°31.909' N, 95°03.498' W, colls: Sites, Shepard & Reynoso-Velasco, L-1285 (1Ƥ, UMC); Altotonga, Reserva Ecológica Pancho Poza, N 19° 44.593', W 97°14.896', 1927 m, 7 November 2009, Sites, Cervantes, & Novelo, L-1118 (23, UMC); same locality, 9 Julio 1999, R. Novelo (13, UMC).

Figures

FIGURE 15. Distribution records of (a) Cataractocoris macrocephalus (b) Cataractocoris marginiventris, (c) Cataractocoris shepardi n. sp.

FIGURES 6 – 9. Cataractocoris marginiventris (6) habitus of PARATYPE; (7) terminal abdominal sterna of female, SGP = subgenital plate, VL 7 = ventral laterotergite VII; (8) pseudoparameres of male segment VIII; (9) male genital capsule including aedeagus and parameres. Sizes are not proportionate among figures.

FIGURES 10 – 14. Cataractocoris shepardi n. sp. (10) habitus of HOLOTYPE; (11) ventral aspect of prothorax; (12) terminal abdominal sterna of female, SGP = subgenital plate, VL 7 = ventral laterotergite VII; (13) pseudoparameres of male tergum VIII; (14) male genital capsule including aedeagus and parameres. Sizes are not proportionate among figures.