Pseudoanthidium scapulare

Kasparek, Max, 2024, New species, new synonyms, and resurrected taxa: A review of West and Central Palaearctic members of the genus Pseudoanthidium (Apoidea: Megachilidae), Zootaxa 5541 (1), pp. 1-50 : 46

Pseudoanthidium scapulare group

10 Clypeus flat with a clock-like shape, apical margin hidden by dense fringe of appressed moustache-like hairs.................................................................................................. P. scapulare group A comprehensive key to the P. scapulare group has been presented by Litman et al. (2021). See also the illustrated review by Kasparek (2022) and the supplement (addition of a new species) by Veerecken (2023).

– Clypeus not flat, apical margin exposed or only slightly covered with hairs...................................... 11