Ambrysus scalenus La Rivers

Reynoso-Velasco, Daniel, 2021, A new species of Ambrysus Stål from the Central Mexican Plateau and new state records for species of the genus in the country (Heteroptera: Nepomorpha Naucoridae), Zootaxa 5005 (3), pp. 304-316 : 313

Ambrysus scalenus La Rivers

( Fig. 7 )

Ambrysus scalenus La Rivers 1953b : Univ. Kans. Sci. Bull., 35: 313–314.

Published records. Mexico: Estado de México, Michoacán ( La Rivers 1953b; Reynoso-Velasco & Sites 2016a, 2018a, 2018b, 2019b).

New state records. Mexico: Guerrero, Oaxaca, Puebla .

Distribution. The previously known distribution of this species included only two locations, El Sabino (type locality in Michoacán) and Paso de Vigas (Estado de México). Based on the material examined for this study, Ambrysus scalenus is distributed exclusively in central Mexico ( Fig. 7 ). The collecting records, all below an elevation of 2000 meters, fall within the boundaries of the Balsas Basin biogeographic province; thus, A. scalenus apparently is endemic to this province. The highest elevation where the species has been collected is 1851 meters, in the upper section of the Balsas Basin (Oaxaca). There are no records of the species from Morelos, but this central state is entirely within the upper section of the Balsas Basin; therefore, A. scalenus most likely is present in this area.

Material examined. ESTADO DE MÉXICO: Mpio.Amatepec, Las Adjuntas, Río San Felipe , 05-Mayo-2008, Novelo & Cuevas colls. (1♀ UMC) ; [Mpio. Tejupilco], Acamochitlan, El Zapote, [El Zapote de Acamuchitlán], 21- XI-1984, H. Brailovsky / Colección del Instituto de Biología , UNAM , México D.F. / C.J. Drake Accession (2♀ USNM) ; [Mpio. Tejupilco], Bejucos, Río Bejucos , 700 m, 22-Abr-2004, R. Novelo coll. / Ambrysus sp. R. Novelo det. 2004 (4♂, 1♀ UMC) ; [Mpio. Tejupilco], Bejucos, Río Bejucos , 1950’, 22-IV-2004 / William D. Shepard, leg. (1♀ EMEC) ; [Mpio. Tejupilco], Bejucos, Temascaltepec, 3-VII-1933 / H.E. Hinton & R.L. Usinger colls. / Ira La Rivers Collection Bequeathed to the California Academy of Sciences (1♂ CAS) ; Mpio. Tejupilco, Paso de Vigas , Arroyo Paso de Vigas , 18º53’32.6’’N, 100º13’57.0’’W, 1107 m, L-1459, 19-Dec-2012, Reynoso-Velasco coll. (6♂, 1♀ UMC) ; same but 5-Apr-2015, L-1909, Reynoso-Velasco, Sites, Shepard & Barr colls. (1♂, 1♀ CNIN; 1♂, 1♀ IEXA; 2♂, 2♀ UMC) ; [Mpio Tonatico], Tonatico, VII-1961 / Colección del Instituto de Biología , UNAM , México D.F. (1♂ CNIN, 1♀ IEXA) ; Tejupilco, Mex., Temascaltepec , 24-VI-1933 / H.E. Hinton & R.L. Usinger colls. (1♂ CAS) ; same but 17-VI-1933 / Ira La Rivers Collection Bequeathed to the California Academy of Sciences (1♀ CAS) . GUERRERO: Km 154 carr. Iguala– Cd. Altamirano, 23-XI-1984, H. Brailovsky coll. / Colección del Instituto de Biología , UNAM , México D.F. (1♀ CNIN) ; same but / C.J. Drake Accession (1♀ USNM) ; same but E. Bar- rera coll. (1♂, 1♀ USNM) ; [ Mpio. Eduardo Neri ], 9 mi N of Zumpango, 8-Jan-1956, J.C. Shafftner / Prop. of J.C. Shafftner / C.J. Drake Accession (2♂ USNM) ; Mpio. Teloloapan, km 20 carr. Teloloapan-Apaxtla de Castrejón , nr. Tepozanalquillo , 18º14’26.8’’N, 99º54’51’’W, 1083 m, 29-Dec-2012, L-1497, Reynoso-Velasco coll. (1♀ UMC) ; Ruta El Caracol, aprox. km 38 Teloloapan, 22-X-1988, J. Bueno coll. / Colección del Instituto de Biología , UNAM , México D.F. (1♀ IEXA) . MICHOACÁN: Mpio. Buenavista, Buenavista Tomatlán , 19º12’57.8’’N, 102º34’30.2’’W, 440 m, 24-Dec-2012, L-1481, Reynoso-Velasco coll. (2♀ UMC) ; Mpio. Carácuaro, Río San Diego at Carácu- aro, 19º01’04.8’’N, 101º07’33.2’’W, 519 m, 22-Dec-2012, L-1473, Reynoso-Velasco coll. (1♂ UMC) ; Mpio. La Huacana , La Huacana , Colonia Lázaro Cárdenas , 18º57’19’’N, 101º48’43.2’’ W, 458 m, L-1478, 23-Dec-2012, Reynoso-Velasco coll. (1♂, 1♀ UMC) ; Mpio. Nocupétaro, San Antonio de la Huerta ( Melchor Ocampo ), 19º02’ 04.4’’N, 101º15’07.9’’W, 624 m, 22-Dec-2012, L-1475, Reynoso-Velasco coll. (1♂ IEXA) ; Mpio. Tepalcatepec, Los Horcones, Pte. Pinolapa at km 31 carr. Tepalcatepec-Coalcomán , 19º00’31.3’’N, 103º01’25.6’’W, 554 m, 25- Dec-2012, L-1484, Reynoso-Velasco coll. (3♂, 2♀ UMC) ; [Mpio. Tepalcatepec], Tepalcatepec, Río Pinolapa , 16- May-2002, R. Novelo coll. (1♀ UMC) ; Mpio. Tuzantla, Río Tuzantla at Tuzantla , 19º13’18.1’’N, 100º34’05.5’’W, 593 m, 21-Dec-2012, L-1470, Reynoso-Velasco coll. (1♂ IEXA) . OAXACA: [ Mpio. Santiago Cacaloxtepec ], 12 mi SE of Huajuapan [de León], 4-VII-1953, 6000 ft / Univ.Kans.Mex. Expedition / Slesnick Field No. 33 / Ambrysus scalenus La Rivers (5♂, 3♀ SEMC); same but / Ira La Rivers Collection Bequeathed to the California Academy of Sciences (1♀ CAS) . PUEBLA: [Mpio.Ahuehuetitla], 10 mi SE of Tehuitzingo, 3900 ft, 3-VII-1933 / Univ.Kans. Mex. Expedition / Slesnick Field No. 32 / Ambrysus scalenus La Rivers 1953 ( Ira La Rivers ) (1 indet. SEMC) .

Figures

FIGURE 7. Distribution of Ambrysus scalenus La Rivers.