Pyropteron atlantis ( Schwingenschuss, 1935 )

Bartsch, Daniel, Pühringer, Franz, Milla, Liz, Lingenhöle, Arthur & Kallies, Axel, 2021, A molecular phylogeny and revision of the genus Pyropteron Newman, 1832 (Lepidoptera, Sesiidae) reveals unexpected diversity and frequent hostplant switch as a driver of speciation, Zootaxa 4972 (1), pp. 1-75 : 56-59

publication ID	https://doi.org/ 10.11646/zootaxa.4972.1.1
publication LSID	lsid:zoobank.org:pub:E78473FE-5662-409A-90C2-7C4912DC57E8
DOI	https://doi.org/10.5281/zenodo.4914600
persistent identifier	https://treatment.plazi.org/id/EB498780-E806-FFE3-5BA4-FB85BBFAFC82
treatment provided by	Plazi
scientific name	Pyropteron atlantis ( Schwingenschuss, 1935 )
status

Treatment

Pyropteron atlantis ( Schwingenschuss, 1935) View in CoL

( Figs 177–179 View FIGURES 171–179 , 186 View FIGURES 180–186 )

Chamaesphecia atlantis Schwingenschuss, 1935 View in CoL : Mémoires de la Société des Sciences Naturelles du Maroc, 42: 106, pl. 1 Fig. 36 View FIGURES 31–38 . Lectotype ♂ ( Fig. 179 View FIGURES 171–179 ): Morocco, southern slope of Djebel Oucheddene, 2200 m (MNP).

This species is poorly known and the name Pyropteron atlantis View in CoL was erroneously used by several authors. Laštůvka & Laštůvka (1995) applied it to the south-western European P. hispanica View in CoL , while Kallies (1999) applied it to populations of P. borreyi View in CoL feeding on Armeria View in CoL in the High Atlas Mts. The paralectotype was figured and redescribed by Kallies (1999). The lectotype was considered lost. Rediscovery of the lectotype ( Fig. 179 View FIGURES 171–179 ) by Pühringer and the discovery of new specimens and larvae now allow us to fix the identity of this taxon and provide a detailed diagnosis. Based on these data, P. atlantis View in CoL is not closely related to P. hispanica View in CoL or P. borreyi View in CoL but belongs to the P. affinis View in CoL group of species.

Redescription. Male. Alar expanse 19–22 mm. Head with labial palpus white with some black scales, second palpomere with black stripe laterally; frons glossy silver-white; vertex black with some reddish-brown, hair-like scales, a small silver-white spot between antenna and ocellus; pericephalic scales dorsally reddish-brown, laterally white; antenna black, scapus with same whitish scales ventrally. Thorax glossy black, inner margin of tegulae and a small spot below forewing base white. Legs black, tibiae and tarsi dark brownish-grey; fore leg with lateral half of coxa, ventral edge of femur and lateral side of tibia white; tibia of other legs laterally in proximal two-thirds white, distally with narrow white ring. Forewing black, transparent areas with ATA and PTA short, ETA oval to round, as broad as apical area, consisting of five cells, first and last cell sometimes very small; vein interspaces of apical area with white stripes in distal half; hind wing with discal spot rather broad and long, nearly reaching M3, distal margin dark grey, narrow. Abdomen glossy black, dorsal stripe and narrow posterior margin of tergites 2, 4 and 6 white, sternites with few white scales, anal tuft medially and laterally narrow white, outer side of valva white.

Male genitalia. As usual for the species group. Gnathos flaps well developed, the middle one rather broad; valva with outer margin concave, apex slightly pointed; crista sacculi long and narrow, slightly s-curved and distally ventrad bent.

Female. Similar to male, but darker and stronger. Head with palpomeres 1 and 2 dorsally black with some white scales, laterally and ventrally white, palpomere 3 black throughout; frons monochrome dark grey. Thorax, wings, legs and abdomen almost completely black; prothorax with a small, yellow-white spot laterally; abdominal tergites 1 and 4 with white spot laterally; posterior margin of tergite 4 narrow white; coxa of fore leg laterally white, tibia of mid and hind leg laterally with some white scales; forewing transparent areas with ATA very short, PTA absent, ETA round, consisting of five cells.

Female genitalia. Not examined.

Diagnosis. P. atlantis is very similar to other species in the group, but differs by the distinct white pattern on deep black ground colour and the completely black abdominal sternites. Fresh specimens have a silvery shine, which is lost over time. Large and dark specimens of P. affinis as they occur especially in the Iberian Peninsula can be similar. However, P. affinis as well as P. erodiiphaga differ from P. atlantis by the lack of a white posterior margin of abdominal tergite 2, the dark grey base colour (black in P. atlantis ), the abdominal sternites and the forewings, which are densely mixed with bright scales (almost completely black in P. atlantis ). We did not find consistent differences in the structure of the male genitalia of these three taxa. There are some differences in the size and shape of the crista medialis of the gnathos, which is long and round in P. atlantis and P. erodiiphaga , small, short and somewhat triangular in P. affinis from western and central Europe. Furthermore, the distal 1/6 of the crista sacculi of the valva is curved ventrad in P. atlantis (distal 1/4 angled at almost 90 degrees in P. erodiiphaga and distal 1/3 bent in a blunt angle in P. affinis ). P. atlantis is also similar to P. borreyi , P. koschwitzi , P. hispanica and P. maroccana . P. atlantis differs from all of them by the black base colour, the absence of the PTA in both sexes and the pure white (never yellowish) colour of the body patterns. Males of P. hispanica , P. maroccana , and P. aistleitneri also differ from P. atlantis by the presence of a white, subapical spot of the antennae. P. kautzi has a very short PTA and a dark brown (not black) body colour, yellowish (not white) pattern and a medial dark brown (not white) anal tuft.

Barcodes. Based on our sequence analysis, P. atlantis is sister to both P. affinis and P. erodiiphaga , suggesting a north-west African origin of the affinis species group.

Biology and habitat. The larvae feed in the upper part of the strong root of Helianthemum croceum (Desfontaines) Persoon (pers. observation Bläsius & Bartsch). The presence of larvae is detected by small amounts of granular, reddish brown excrement extruded from the bore, which loosely adheres to the roots of the hostplant. Some caterpillars found at the end of May produced abundant frass during the summer but did not develop into moths, suggesting that the development takes at least two years. Pupation takes place in the gallery of the larva in the lowest part of the stem or a basal branch. Before pupation, the larva constructs a short tunnel closed by a well visible, silken lid, which is mixed with frass. In the area of Oukaimeden two Helianthemum species occur, the abundant H. croceum and the closely related, but much rarer H. helianthemoides (Desfontaines) Grosser. Larvae could only be found in the first, which is widespread on crystalline soils at high altitude in the High Atlas Mts where it often forms masses on gently to moderately grazed slopes ( Jury et al. 2008). This species is poorly attracted to currently available artificial pheromones. Only a single male could be caught flying around a pheromone contaminated backpack in strong wind in late afternoon (RB).

Distribution. Only known from the High Atlas Mts south of Marrakech, Morocco.

Specimens examined. 1♂, Morocco, High Atlas , Oukaimeden, 12. VI .2003, leg. RB (Bartsch gen. prep. 2004- 13) ( Fig. 186 View FIGURES 180–186 ) ( CDB) ; 1♂ ( Figs 177–178 View FIGURES 171–179 ), Morocco, High Atlas, NE slope of Jebel Oukaimeden, 2800–2900m, e.l. ex Helianthemum croceum , larva 23. V ., adult 5.VI.2005, leg. DB (BOLD DB-Lep-00054); 2♂, ibid., e.l. ex H. croceum , larvae 13. V ., adults 5.VI . and 10. VI .2006, leg. DB; 1♂, ibid., e.l. ex H. croceum , larva 14. VI ., adult 17.VI.2005, leg. DB (CDB). 1♀, High Atlas, Plateau Yagour E., 2300m, 25.VII.1955 [without hind legs] ( CWS) .