Ancyloscelis bonariensis Brèthes, 1910

Schaller, A. & Roig-Alsina, A., 2021, A revision of the bee genus Ancyloscelis (Hymenoptera: Apidae) in Argentina, Zootaxa 4980 (3), pp. 521-540 : 523

Ancyloscelis bonariensis Brèthes

( Figs. 1A , 2A , 3A , 9 , 10A , 12A, 12D , 13A )

Ancyloscelis bonariensis Brèthes, 1910: 294 (Lectotype male, Argentina, Buenos Aires, 14.XII.1908, J. Brèthes, MACN, examined, present designation). Schrottky, 1920: 170. Michener & Moure, 1957: 440. Roig-Alsina, 1999: 19. Moure & Melo, 2007: 145. Galvani et al., 2012: 675.

Leptergatis bonaërensis (sic): Schrottky, 1913: 255.

Diagnosis. Females of A. bonariensis are distinguished from other species with hooked hairs on the mouthparts by the yellow mid and hind tibial spurs, and by the hairs next to the hypostomal carina, on anterior trochanter, and on S1–S4 ( Fig. 9C ), which have wavy apices. Males are distinguished by the unique shape of the posterior basitarsus, without median tooth, and with broadly rounded apex ( Fig. 10A ).

Redescription. Male. Total length 8.70–10.80 mm. Length of forewing 6.80–8.25 mm.

Color. Black, with following parts yellow: entire labrum, base of mandible, apical band on clypeus (basal border of band more or less straight); tarsi of all legs brownish. Wings weakly infuscate, paler apically; veins and pterostigma blackish. Pilosity. Yellow hairs all over the body, paler on underside of thorax and on bands of T2–T5. Scutum with two strata of hairs, one of dense, very short hairs (0.30–0.55x MOD) and another one of interspersed, longer hairs (0.80–1.13x MOD). Hairs of mesopleuron 0.53–1.58x MOD. T1–T5 with entire apical bands. Structure. OOD 0.59x IOD. IAD 2.24x AOD. UID 1.12x LID. Width of head 1.29x length of head. Clypeocular distance 0.22–0.29x MOD. Ventral part of mesopleuron without projections in front of mid coxa. Hypostomal carina forming rounded elevation. Posterior tibia with under surface nearly glabrous and ventral inner margin with tubercle continued apically by carina up to tibial spur. Posterior basitarsus without median tooth, and with broadly rounded apex. Sculpture. Disc of clypeus with close, fine punctures (0.03–0.04 mm); disc of scutum with similar punctures (0.03–0.04 mm), separated by polished interspaces 0.2–0.3 PD. Mesopleuron with punctures 0.03–0.04 mm separated by polished interspaces 0.5–1.0 PD.

Female. Total length 7.80–9.25 mm; length of forewing 6.00– 6.40 mm. Color. Black, except brownish tegula and yellow tibial spurs. Pilosity. Whitish all over the body, paler on underside of thorax. Disc of T2–T4 with white hairs; apical bands white to yellowish. Tibial scopa with yellow hairs dorsally and white hairs ventrally; yellow fimbria of T5 interrupted in the middle by black lock. Hairs with wavy apices present next to hypostomal carina, on anterior trochanter, and on S1–S4. Scutum with two strata of hairs, one of dense, very short hairs (0.48–0.70x MOD) and another one of interspersed, longer hairs (0.92–1.03x MOD). Hairs of mesopleuron 1.11–1.37x MOD. T1–T5 with entire apical bands. Structure. OOD 0.61x IOD. IAD 2.1x AOD. UID 0.83x LID. Width of head 1.38x length of head. Clypeocular distance 0.44x ocellar diameter. Combined lengths of first and second labial palp segments 1.23x length of prementum. Labial palpus with modified setae on first and second segments; prementum also with modified setae. Sculpture. Disc of clypeus with close, fine punctures (0.02–0.03 mm); disc of scutum with similar, close punctures (0.02–0.03 mm), separated by polished interspaces 0.1–0.3 PD. Mesopleuron with punctures 0.03–0.04 mm separated by polished interspaces 0.5–1.0 PD.

Comments. Brèthes based his description on two males of which only one is preserved at MACN. This specimen is designated as the lectotype. It is in very good condition, missing only the left hind distotarsus; the genitalia and associated sterna are preserved in a vial. It bears the following labels: “ Bs. Aires / 14.XII.08/ J. B.,” “ Leptergatis / bonaërensis Brèthes ,” “ Ancyloscelis / bonariensis Brèthes / LECTOTYPUS / Schaller et Roig A.” and “MACN-En 12784.” In the collection at MACN there are five females of A. bonariensis collected by Brèhtes on the same date as the lectotype, but they were misidentified by him as Leptergatis mesopotamica .

Distribution. Argentina and Paraguay. Argentina: provinces of Formosa, Chaco, Entre Ríos, Buenos Aires, and Santa Fe. Paraguay: department of Guayra.

Material studied. Argentina. Formosa: 15 ♂, 12 ♀, Colonia Aquino , 26-X-2011, G. Galvani ( MACN) ; 1 ♂, Capital , 1-I-2009, G. Galvani ( MACN) ; 1 ♂, 1 ♀, San Hilario 26-X-2011, G. Galvani ( MACN) ; 2 ♂, San Francisco de Laishí , 09-I-2014, J.P. Torretta, ( MACN) ; 13 ♂, 7 ♀, Tres Marias , XI-2013, 22-XI.2018, L. Compagnucci and G. Galvani ( MACN) ; 1 ♂, Gran Guardia , 20-X-1952 ( MLP) . Chaco: 1 ♂, 1 ♀, Puerto Tirol , 14-XII-2016, A. Schaller ( MACN) ; 1 ♂, Puerto Tirol , 3-I-2017, A. Schaller ( MACN) ; 12 ♂, 12 ♀, Colonia Benítez , 22-X-2016, 18-XII-2016, 10-XI-2017, A. Schaller ( MACN) ; 2 ♂, Resistencia , 31-X-2016, A. Schaller ( MACN) ; 3 ♂, 2 ♀, Zona Monte Alto , 15/ 29-XII-2016, 14-III-2019, A. Schaller ( MACN) ; 2 ♂, Colonia Mixta , 4-I-2017, A. Schaller ( MACN) , 2 ♂, 4 ♀, Colonia Elisa , 15-XI-2017, A. Schaller ( MACN) , 2 ♂, Parque Caraguatá , 14-III-2019, A. Schaller ( MACN) . Entre Ríos: 3 ♂, 1 ♀, Pronunciamiento , I-1981, J. Foerster, ( MACN) . Buenos Aires: 5 ♀, Capital Federal , 14-XII.1908, J.B. ( MACN) ; 1 ♀, 4 km NW Tigre , 28-II-1985, A. Roig ( MACN) . Santa Fe: 1 ♂, Rosario , 10-XII-1945, A.O. ( MLP) ; 1 ♀, 1 ♂, Fontana , 28-III-1942 ( MLP) ; 1 ♀, Villa Ocampo , 26-III-1941 ( MLP) . Paraguay. Guayra: 2 ♀, Villarica, December ( MACN) .

Figures

FIGURE 1. Females, A. ursinus species group, lateral view. A, A. bonariensis Brèthes. B, A. halictoides (Holmberg). C, A. holmbergi sp. n. D, A. mesopotamica (Holmberg). Scale lines = 0.1 mm.

FIGURE 2. Males, A. ursinus species group, lateral view. A, A. bonariensis Brèthes. B, A. halictoides (Holmberg). C, A. holmbergi sp. n. D, A. mesopotamica (Holmberg). Scale line= A, C and D, 0.1 mm; B, 0.2 mm.

FIGURE 3. Males, A. ursinus species group, head, frontal view. A, A. bonariensis Brèthes. B, A. halictoides (Holmberg). C, A. holmbergi sp. n. D, A. mesopotamica (Holmberg). Scale lines = 0.5 mm.

FIGURE 9. A–B, mouthparts of A. bonariensis. A, hooked setae on labial palpus. B, hooked setae on prementum and stipes. C, metasomal sterna S1–S4 of A. bonariensis showing modified setae. Scale lines = 0.5 mm.

FIGURE 10. Males, A. ursinus species group, posterior basitarsus, ventral view. A, A. bonariensis Brèthes. B, A. halictoides (Holmberg). C, A. holmbergi sp. n. D, A. mesopotamica (Holmberg). Scale lines = 0.2 mm.

FIGURE 12. A–B, dorsal view of female pronotal lobe (p, pronotal lobe). A, A. bonariensis Brèthes. B, A. mesopotamica (Holmberg). C–D, lateral view of male head showing hypostomal carina (h). C, A. halictoides (Holmberg). D, A. bonariensis Brèthes. Scale lines = A–D, 0.2 mm.

FIGURE 13. A–H, distribution map of Ancyloscelis species in Argentina.A, A. bonariensis. B, A. halictoides. C, A. holmbergi. D, A. mesopotamica. E, A. apiformis. F, A. nigricornis. G, A. romeroi. H, A. saltensis. Black dots, records from literature; red dots, new records.