Ancyloscelis holmbergi Schaller, 2021

Schaller, A. & Roig-Alsina, A., 2021, A revision of the bee genus Ancyloscelis (Hymenoptera: Apidae) in Argentina, Zootaxa 4980 (3), pp. 521-540 : 525-526

Ancyloscelis holmbergi Schaller sp. n.

( Figs. 1C , 2C , 3C , 4A–D , 10C , 13C )

Diagnosis. Females of A. holmbergi are distinguished, among species with hooked hairs on the first and second labial palpi, by the black and white scopa ( Fig. 1C ), the black hairs on the discs of T2–T4, and the very short pubescence of the scutum. Males are characterized, among males with golden pubescence, by the pointed hind basitarsus without inner tooth ( Fig. 10C ), and the strongly emarginate S6 ( Fig. 4A ).

Description. Holotype male. Total length 7.50 mm (paratypes 6.20–8.10 mm). Length of forewing 6.50 mm (paratypes 5.60–6.50 mm). Color. Black, with following parts yellow: entire labrum, base of mandible, apical band on clypeus with trilobate basal margin, spot on apical 0.75 of under surface of scape, underside of first flagellomere, apex of tibiae, and tarsi of all legs, except distotarsi brownish; following parts brownish: underside of flagellomeres 2–11, tegula, and large spot on hind femur occupying approximately basal half of dorsal and lateral surfaces. Wings weakly infuscate, paler apically; veins and pterostigma blackish. Structure. OOD 0.7x IOD. IAD 1.7x AOD. UID 1.15x LID. Width of head 1.30x length of head. Clypeocular distance 0.26–0.29x MOD. Ventral part of mesopleuron witht digitiform projection in front of mid coxa. Hypostomal carina forming rounded elevation. Posterior basitarsus without median tooth; apex pointed. Pilosity. With yellow-golden hairs all over the body, paler on underside of thorax. Scutum with two strata of hairs, one of dense, very short hairs (0.07–0.11x MOD) and another one of interspersed, long hairs (0.50–0.80x MOD). Hairs of mesopleuron 1.20–1.30x MOD. T1–T5 with entire apical bands. Inner surface of hind basitarsus with short hairs, 0.60–1.10x MOD. Sculpture. Disc of clypeus with close, fine punctures (0.030 –0.035 mm); disc of scutum with smaller, close punctures (0.015 –0.020 mm). Mesopleuron with punctures 0.03–0.04 mm separated by polished interspaces 0.4–05 PD.

Female. Total length 7.0–8.0 mm; length of forewing 5.6–6.5 mm. Color. Black, with brownish flagellum and tegula. Structure. OOD 0.74x IOD. IAD 2.0x AOD. UID 1.00x LID. Width of head 1.41x length of head. Clypeocular distance 0.5x MOD. Length of first plus second labial palp segments 1.5x length of prementum. Labial palpus with modified setae on firs t and second segments. Pilosity. Head and mesosoma with whitish hairs, paler on under side of thorax, discs of T2 – T4 with black hairs; apical bands white to yellowish; tibial scopa with black hairs dorsally and white hairs ventrally, prepygidial fimbria interrupted medially by a black tuft. Hairs with apices straight on hypostomal carina, on anterior trochanter, and on S3–S4. Scutum with two strata of hairs, one of dense, very short hairs (0.12–0.24x MOD) and another one of interspersed, long hairs (0.52–0.60x MOD). Hairs of mesopleuron 0.84–1.28x MOD. T1 – T5 with entire apical bands. Sculpture. Disc of clypeus with close, fine punctures (0.03–0.04 mm), and disc of scutum with smaller, close punctures (0.010 –0.015 mm), separated by polished interspaces 0.3–0.5 PD. Mesopleuron with punctures 0.03 mm separated by polished interspaces 0.5–1.0 PD.

Etymology. The species is named after Eduardo L. Holmberg, who was the first to study Ancyloscelis in South America.

Comments. Ancyloscelis holmbergi most resembles A. ursinus , A. duckei , and A. mesopotamica , the males of which also have a dense golden pubescence, yellow hind basitarsi, and an apical trilobate yellow mark on the clypeus. It shares with A. duckei the shape of the S6 of the male, deeply emarginate apically, and a brown spot on the dorsolateral surface of the hind femur. It differs from A. duckei , and A. mesopotamica by the hind basitarsus of the male without an inner tooth. It differs from A. ursinus by the darker cuticle and vestiture, and the strongly emarginate S6 of the male.

Distribution: Argentina: provinces of Chaco, Corrientes, and Formosa.

Material studied. Holotype male, Argentina, Puerto Tirol, Chaco, 3-I-2017, Schaller Alicia ( MACN). The following are paratypes. Argentina. Chaco: 17 ♂, 1 ♀, Parque Caraguatá, 21/ 26-XII-2016, 3-I-2017, 14-XI-2017, 14-III-2019, A. Schaller ( MACN); 13 ♂, 1 ♀, Colonia Mixta, 4-I-2017, A. Schaller ( MACN); 1 ♂, 1 ♀, Lapachito, 17-XII-2016 A. Schaller ( MACN); 12 ♂, 12 ♀, Colonia Benítez 22-X-2016, 15/ 18-XII-2016, 10/ 15-XI-2017, 20- XI.2018, A. Schaller ( MACN); 4 ♂, 8 ♀, Puerto Tirol, 14-XII-2016, 3-I-2017, A. Schaller ( MACN); 15 M, 3 ♀, Co- lonia Elisa, 15-XI-2017, A. Schaller ( MACN); 9 ♂, 2 ♀, Zona Monte Alto, 29-X-2016, 15-XII-2016, 14-III-2019, A. Schaller ( MACN); 1 ♀, Villa Fabiana, 30-XII-2016, A. Schaller ( MACN); 9 ♂, 1 ♀, Camino Isla del Cerrito , 7/ 10-I-2018, 21-XI-2018, 15-III-2019, A. Schaller ( MACN). Corrientes: 1 ♂, San Cayetano, EBCO, 6/ 10-XI-2007 Compagnucci ( MACN). Formosa: 4 ♀, Francisco de Laishi , 7-I-2014, J. P. Torretta ( MACN), 1 ♀, Tres Marías, XI-2013, G. Galvani ( MACN); 14 ♂, 9 ♀, Tres Marías, 22-XI-2018, Galvani and Compagnucci ( 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 4. Ancyloscelis holmbergi sp. n., male. A, S6, ventral view. B, genital capsule, ventral view. C, S7, ventral view. D, S8, ventral view. Scale lines = A, C, and D, 0.2 mm; B, 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 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.