Andrena acuta, WARNCKE, 1993

Kratochwil, Anselm & I, Canary, 2020, Revision of the Andrena wollastoni group (Hymenoptera, Anthophila, Andrenidae) from the Madeira Archipelago and the Canary Islands: upgrading of three former subspecies and a description of three new subspecies, Linzer biologische Beiträge 52 (1), pp. 161-244 : 225-227

Andrena acuta differentiated from A. catula , A. dourada , A. g. palmae, A. lineolata , A. tiaretta , and A. wollastoni

- Andrena acuta – A. catula : The species are separated in the space spanned by shape PC1 and shape PC2 when using 12 morphometric parameters (BL, FL3, FVL, FVW, HL, HW, LPW, MSW, MTW, OOD, PSL, and WL) ( Fig. 32a). The two best ratios plotted (the first and second ratios) are BL/FL3 and BL/LPW (the best ratios using 14 parameters: BL, FL2, FL3, FVL, FVW, HL, HW, LPW, MSW, MTW, OOD, PBAL, PSL, and WL). Both clusters are relatively close to each other.

- Andrena acuta – A. dourada : The species are separated in the space spanned by shape PC1 and shape PC2 when using 12 morphometric parameters (BL, FL2, FVL, FVW, HL, HW, MSW, MTW, PBAL, POD, PSL, and WL) ( Fig. 32b). The two best ratios plotted (the first and second ratios) are BL/PBAL and FVW/PSL (the best ratios using 11 parameters: BL, FVL, FVW, HL, HW, MSW, MTW, PBAL, POD, PSL, and WL). Both clusters are relatively close to each other.

- Andrena acuta – A. g. palmae: Both taxa are partially separated in the space spanned by shape PC1 and shape PC2 when using 16 morphometric parameters (BL, FL1, FL2, FL3, FVL, HL, HW, LPW, MSW, MTW, OCD, OOD, PBAL, POD, PSL, and WL) ( Fig. 32c). The two best ratios plotted (the first and second ratios) are FVL/OCD and FVL/OOD (the best ratios using the same 16 parameters).

- Andrena acuta – A. lineolata : The species are separated in the space spanned by shape PC1 and shape PC2 when using 11 morphometric parameters (BL, FL3, FVL, FVW, HL, HW, MSW, MTW, OOD, POD, and PSL) ( Fig. 32d). The two best ratios plotted are HL/HW and OOD/POD (using the same morphometric parameters). The cluster of PC1/PC2 are close in contrast to the clusters of the best ratios, which are well separated. The clusters of the best ratio of A. acuta – A. lineolata is much more separated than the clusters of A. acuta – A. dourada .

- Andrena acuta – A. tiaretta : The species are separated in the space spanned by shape PC1 and shape PC2 when using 11 morphometric parameters (BL, CL, FL1, FL2, FL3, FVL, FVW, HL, HW, LPW, and MSW) ( Fig. 32e). The two best ratios plotted are FVL/HL and FVW/LPW (using the same morphometric parameters). The cluster of PC1/PC2 and the clusters of the best ratios are clearly separated.

- Andrena acuta – A. wollastoni : The species are separated in the space spanned by shape PC1 and shape PC2 when using six morphometric parameters (HL, HW, MSW, POD, PSL, and WL) ( Fig. 32f). The two best ratios plotted are MTW/POD and HW/WL (using the morphometric parameters FL1, HL, HW, LPW, MSW, MTW, POD, PSL, and WL). The cluster of PC1/PC2 and the clusters of the best ratios are clearly separated.