Limnocoris pygmaeus La Rivers, 1971

Rodrigues, Higor D. D. & Sites, Robert W., 2019, Revision of Limnocoris (Heteroptera: Nepomorpha: Naucoridae) of North America, Zootaxa 4629 (4), pp. 451-497 : 483-485

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Limnocoris pygmaeus La Rivers


Limnocoris pygmaeus La Rivers

( Figs. 2A View FIGURE 2 , 15 View FIGURE 15 , 19 View FIGURE 19 A–B, 20A)

Limnocoris pygmaeus La Rivers, 1956: 92–94 (original description).

Limnocoris solenoides La Rivers, 1970: 5–6 (original description) (new synonym).

Limnocoris pygmaeus: La Rivers 1971: 76 (catalog); Nieser & López-Ruf 2001: 319 (catalog).

Diagnosis. The distal margin of the labrum is distinctly acuminate ( Fig. 15D View FIGURE 15 ). The mesosternal carina has the lateral margins of the fossa touching each other, leaving a small posterior opening ( Fig. 15D View FIGURE 15 ). The dorsal surface of the body is usually yellow to light brown, and the hemelytral membrane has a pale spot medially ( Figs. 15A, C View FIGURE 15 ).

Measurements (n = 5 males / 5 females). Body length 5.50–6.80/ 5.90–7.20, body width 4.00–4.90/ 4.20–4.93, synthlipsis 1.15–1.23/ 1.20–1.27, head length 0.95–1.18/ 1.00–1.17, head width 1.90–2.40/ 2.00–2.40, pronotum length on midline 1.03–1.40/ 1.20–1.45, pronotum width 3.41–4.30/ 3.62–4.30, scutellum length 0.82–1.10/ 1.02– 1.20, scutellum width 1.70–2.40/ 1.95–2.40, hemelytra length 4.10–5.10/ 4.43–5.25.

Supplemental description. Maxillary plate tumescent anteriorly. Antenna not exceeding lateral margin of eye; pedicel quadrate; flagellomeres slender, not partially fused, with long setae. Pubescent area of propleuron distinctly extended posteriorly along lateral margin (as in Fig. 1B View FIGURE 1 ); posterior margin of propleuron convex at mid-length; posteromesal corner near prosternellum deflexed ventrally. Region between mesobasisternum and mesoepisternum with longitudinal row of elongate golden setae ( Fig. 15D View FIGURE 15 ). Metasternal carina well developed, fossa rounded to teardrop-shaped ( Fig. 15D View FIGURE 15 ), slightly depressed medially; posterior margin excavated in lateral view. Lateral margin of abdomen with minute serration; posterolateral corners of II–V narrowly rounded to right angled, not spinose; sterna with elongate golden setae generally dispersed, concentrated at midline of segments III–V; sternum II with sinuous row of golden setae. Male: mediotergite VI with accessory genitalic process poorly developed; posterior margin of mediotergite VII ranging from convex to sinuous, forming two inconspicuous lobes medially; laterotergite VII with mesal margin convex ( Fig. 19A View FIGURE 19 ); lateral lobe of tergum VIII with lateral margin straight in anterior half; left medial lobe with small distolateral production, with distal margin rounded; right medial lobe slightly twisted in distal third ( Fig. 19B View FIGURE 19 ). Female: lateral margins of subgenital plate with tuft of elongate setae at mid-length, posterior margin ranging from convex to narrowly rounded; laterosternite VII with posterolateral corner produced posteriorly ( Fig. 15E View FIGURE 15 ).

Comparative notes. This species is morphologically similar to L. inornatus , sharing the general morphology and pubescence of the body. In specimens of L. pygmaeus , the dorsal coloration of the body is light brown to yellowish, and the hemelytral membrane has a large pale central spot, whereas in L. inornatus the body color is usually medium brown to dark brown, and the hemelytral membrane is mottled with light brown, but not as a single medial spot.

Discussion. Examination of paratypes of L. pygmaeus and L. solenoides revealed that both species are morphologically very similar and identical in features that are generally used to discriminate among species of Limnocoris . In the original description of L. solenoides, La Rivers (1970) differentiated it from L. pygmaeus only by having a longer body, a more “developed” color pattern and by the claval suture more prominent. We consider these differences to be intraspecific variation and propose L. solenoides to be a junior synonym of L. pygmaeus . In addition, three female paratypes of the type series of L. laucki were misidentified and are L. pygmaeus ; this was confirmed after examination of the holotype of L. laucki , which differs substantially from L. pygmaeus . However, L. laucki is here proposed as a junior synonym of L. signoreti (see Discussion in L. signoreti ).

Distribution. This species is known only from Mexico. The records are concentrated in the western part of the country ( Fig. 20A View FIGURE 20 ).

Published records. Mexico: Guerrero ( La Rivers 1956).

Type material examined. All specimens macropterous. PARATYPES of L. pygmaeus : MEXICO, Guerrero, Kil. 438, South of Mex. City, 11.I.1936, H.D. Thomas (3♂, 2♀, CAS; 1♀, USNM). PARATYPES of L. solenoides : MEXICO, Oaxaca, 18 mi. NW El Camaron, 20.VIII.1959, A.E. Menke collector (1♂, 2♀, CAS). PARATYPES of L. laucki : MEXICO, Nayarit, Ahuacatlán , 12.Aug.1957, D. Lauck (2♀, CAS; 1♀, USNM) .

Additional material examined. All specimens macropterous. MEXICO, Guerrero, Acahuizotla, 27.VI.1983, M. García (1♂, USNM). Jalisco, 6.6 Km SE Villa Purificacion, Puente El Amborin , 08.I.2005, William D. Shepard leg (11♂, 25♀, EMEC) ; 3.4 Km NW El Tuito, 15.I.2005, 1900’, Rio Tuito , William D. Shepard leg (1♂, EMEC) ; SE of Chamela, 06.I.2005, 180’, Rio Cuitzmala , William D. Shepard leg (9♂, 11♀, EMEC) ; Hwy 200, Km 84.5, 06.I.2005, 100’, Rio San Nicolas , William D. Shepard leg (1♂, 2♀, EMEC) ; El Rincon, CL-1231, 27.XI.1968, J.T. Polhemus (1♀, USNM) ; Rio Tomatlan , 300’, CL-736, 09.VI.1975, J.T. Polhemus (2♂, USNM) ; N. Campo Acosta, CL-737, Rio San Nicolas , 09.VI.1975, J.T. Polhemus (1♂, 3♀, USNM) ; Rio Tomatlán , 300’, CL-736, 09.VI.1975, J.T. Polhemus (2♀, USNM) ; El Tuito, 17.III.1975, H. Brailovsky (1♂, USNM) ; Río Cuitzmala, 2.5 Km North of Emiliano Zapata , 06.I.2005, C.B. Barr (2♂, 2♀, UMC) . Nayarit, Las Sabinas, Mpio de Nayar , 11.IV.1991, E. Barrera & J. Leon (3♂, 1♀, UMC) ; Rio Santiago, Colorado de la Mora, Arroyo San Pobleño , 20.V.1991, R. Barba & E. Barrera (1♀, UMC) . Oaxaca, 23 Km carr-, Pochutla , 08.II.1982, A. Ibarra (1♀, USNM) ; same data, except 07.II.1982 (1♂, USNM) ; San Cristobal , 17.VI.1984, M. García (1♂, 1♀, USNM) ; same data, except R. Mendoza (1♀, USNM) ; Candelaria Loxita , Rio San Juan, N 15º55.583’, W 96º29.225’, 427 m, 2 April 2015, Sites, Reynoso- Velasco, Shepard, Barr, rocks, gravel L-1904 (11♂, 19♀, UMC) ; Candelaria Loxita, Rio San Juan at Puente San Juan, N 15º55.541’, W 96º29.400’, 410 m, 2 April 2015, Sites, Reynoso-Velasco, gravel riffles L-1905 (4♂, 2♀, UMC; 1♀, MZUSP) ; Mpio. San Gabriel Mixtepec, San Gabriel Mixtepec , Rio Rana, N 16º6.107’, W 97º3.880’, 696 m, 2 April 2015, Sites, Reynoso-Velasco, Shepard, Barr, rocks & gravel, L-1906 (12♂, 6♀, UMC; 1♂, MZUSP) ; Rio Las Arenas , N16º19.953’, W98º0.928’, 54 m, 3 April 2015, Sites & Reynoso-Velasco, sand & rocks, L-1907 (6♂, 22♀, UMC) . Sinaloa, Villa Union , CL- 1022, 21.April.1964, J.T. Polhemus & M.S. Polhemus (5♂, 6♀, USNM) ; Mazatlán , 25–26.V.1934, H.E. Hinton (1♂, 1♀, USNM) ; Villa Union , 10’, CL-718, 06.VI.1975, J.T. Polhemus (7♂, 2♀, USNM; 1♂, UMC) . Sonora, 9 mi. E Sabino , 1500’, CL-727, 05.VI.1973, J.T. Polhemus (1♀, USNM) .


California Academy of Sciences


Smithsonian Institution, National Museum of Natural History


Essig Museum of Entomology


Museu de Zoologia da Universidade de Sao Paulo














Limnocoris pygmaeus La Rivers

Rodrigues, Higor D. D. & Sites, Robert W. 2019

Limnocoris pygmaeus: La Rivers 1971: 76

Nieser, N. & Lopez-Ruf, M. 2001: 319
La Rivers, I. 1971: 76