Pseudoanthidium (Pseudoanthidium) nanum (MocsÁry, 1881)

Vertommen, Win, Vanormelingen, Pieter, D’Haeseleer, Jens, Wood, Thomas J., Baugnée, Jean-Yves, Blanck, Tim De, Grave, David De, Rycke, Samuel De, Deschepper, Chantal, Devalez, Jelle, Feys, Simon, Foubert, Olivier, Jacobs, Maarten, Janssen, Kobe, Legrain, Benjamin, Molenberg, Jean-Marc, Pauly, Alain, Pasau, Bernard, Reynaerts, Annie, Verheyen, Stefan, Wallays, Henk, Wielandts, Maarten & Vereecken, Nicolas J., 2024, New and confirmed wild bee species (Hymenoptera: Apoidea: Apiformes) for the fauna of Belgium, with notes on the rediscovery of regionally extinct species, Belgian Journal of Entomology 149, pp. 1-64 : 46-47

publication ID	https://doi.org/10.5281/zenodo.16958242
publication LSID	lsid:zoobank.org:pub:387AD02A-54C0-4D7E-BF1F-FA0F748217F7
persistent identifier	https://treatment.plazi.org/id/1B4187C4-FFCD-FFCD-FBB6-FDAAFD5D9824
treatment provided by	Felipe
scientific name	Pseudoanthidium (Pseudoanthidium) nanum (MocsÁry, 1881)
status

Treatment

Pseudoanthidium (Pseudoanthidium) nanum (MocsÁry, 1881) View in CoL

Figs 7 View Fig , 12 View Fig F-G, 14 F

SHORT DESCRIPTION: P. nanum is a small-sized (7-8 mm) species from the Anthidiini tribe with yellow spots on the sides of the tergites. Females have yellow rounded marks next to their eyes. Males lack spines on their tergites and have therefore an entirely rounded abdomen. This is a thermophilic species that seems to take advantage of climate change. The species has so far been found in the warmest locations in Belgium, like railway yards and slag heaps.

DISTRIBUTION IN EUROPE: This species is widely distributed in Europe, from Crete to the Netherlands (approved observations on https://waarneming.nl/species/206505/) and Poland ( LITMAN et al., 2022). There are also some observations from Russia and even the USA (where it has been unintentionally introduced) ( SCHEUCHL & WILLNER, 2016). It has not yet been found in the United Kingdom ( ELSE & EDWARDS, 2018), but it is present in the Grand Duchy of Luxembourg ( HERRERA MESÍAS & WEIGAND, 2021), Germany and France ( SCHEUCHL & WILLNER, 2016).

EU RED LIST STATUS: Least concern (LC) ( NIETO et al., 2014)

ORIGIN OF RECORDS:

- ANTWERP PROVINCE. Antwerpen; 1♀; 28.vi.2019; leg. S. Verheyen; det. J. Devalez. 1♀; 6.vii.2019; leg./det. S. Verheyen. 2♀♀; 7.vii.2019; leg./coll./det. O. Foubert, S. Verheyen. 2♀♀; 9.vii.2019; leg./det. S. Verheyen. 1♂; 27.v.2020; leg./det. S. Verheyen. 2♂♂; 28.v.2020; leg./det. S. Verheyen. 1♂; 31.v.2020; leg./coll./det. J. D’Haeseleer. 1♂; 10.vi.2020; leg./det. O. Foubert. 1♀; 11.vi.2020; leg./det. S. Verheyen. 1♀; 16.vi.2020; leg./det. K. Geeraerts. 1♂; 17.vi.2021; leg./det. S. Verheyen - Fig. 12 View Fig F-G. 1♀ 1♂; 27.vi.2021; leg./coll./det. W. Vertommen. 1♀ 1♂; 29.vi.2021; leg./det. S. Verheyen. 1♀; 9.vii.2021; leg./det. J. D’Haeseleer. 1♀ 1♂; 17.vii.2021; leg./det. K. Schoonvaere. 1♀ 1♂; 17.vii.2021; leg./det. K. Schoonvaere. 1♂; 2.vi.2022; leg./det. D. De Grave. 1♂; 3.vi.2022; leg./det. S. Verheyen. 1♂; 6.vi.2022; leg./det. J. D’Haeseleer. 2♂♂; 16.vi.2022; leg./det. M. Wielandts. 2♀♀ 2♂♂; 16.vi.2022; leg./det. S. Verheyen. 3♀♀; 10.vii.2022; leg./det. J. Turelinckx. 1♀; 7.viii.2022; leg./det. O. Foubert. 1♂; 9.viii.2022; leg./det. S. Verheyen. 1♂; 4.vi.2023; leg./det. S. Verheyen. 1♀; 25.vi.2023; leg./det. S. Verheyen. 1♀; 14.vii.2023; leg./det. S. Verheyen. 3♀♀; 14.vii.2023; leg./det. M. Wielandts.

- LIMBURG PROVINCE. Genk ; 1♀; 5.viii.2020; leg./coll./det. K. Janssen.

- LIÈGE PROVINCE. Visé; 1♀; 15.viii.2020, leg./coll./det. K. Janssen.

- HAINAUT PROVINCE. Mouscron; 3♀♀; 18.vii.2021; leg./coll. Y. Gevaert, T. De Blanck; det. Y. Gevaert, T. De Blanck, T. J. Wood. 2♀♀ 1♂; 15.viii.2021; leg./coll. Y. Gevaert; det. Y. Gevaert, T. J. Wood. 1♀; 3.vii.2022; leg./det. T. De Blanck .

- NAMUR PROVINCE. Doische; 1♂; 22.vii.2021; leg./coll./det. D. De Grave.

- WEST FLANDERS PROVINCE. Harelbeke ; 2♀♀; 4.vii.2022 ; leg./det. J. D’Haeseleer. 1♀; 9.vii.2022; leg./coll./det. T. De Blanck. Wevelgem ; 1♀; 15.vii.2022 ; leg./det. Y. Gevaert. 1♀; 1.viii.2022; leg./det. Y. Gevaert. 1♀; 6.viii.2022; leg./det. Y. Gevaert. 2♀♀; 10.viii.2022; leg./det. Y. Gevaert. 1♀; 14.viii.2022; leg./det. Y. Gevaert. 1♀; 28.viii.2022; leg./det. Y. Gevaert. 1♀; 2.ix.2022; leg./det. Y. Gevaert. 1♀; 24.vi.2023; leg./det. Y. Gevaert. 1♂; 9.vii.2023; leg./det. Y. Gevaert. 1♀; 14.vii.2023; leg./det. Y. Gevaert. 2♀♀; 21.vii.2023; leg./det. Y. Gevaert. 2♀♀; 4.viii.2023; leg./det. Y. Gevaert. 3♀♀; 7.viii.2023; leg./det. Y. Gevaert. Nieuwpoort; 1♀; 18.vii.2022; leg. S. Martens; det. J. D’Haeseleer.

COMMENTS:

- P. nanum View in CoL was published in the 2019 IUCN Belgian Red List of bees ( DROSSART et al., 2019) under the then existing complex name Pseudoanthidium scapulare ( KASPAREK, 2022) View in CoL . It was categorised as Not Applicable, because it was not clear if there were any existing populations of the species in Antwerp at that time. It is now clear that it has wellestablished populations at different localities in the region of Antwerp and that it seems to be spreading rapidly throughout the rest of the country.

- All collected specimens have been identified in the past using sources available at that moment. They have recently been checked again using LITMAN et al. (2022). No other Pseudoanthidium species have so far been found in Belgium.

- The first observation from this species in the Netherlands dates from 2020 (approved observations on https://waarneming.nl/species/206505/). There is also an observation from 2023 on a different location.