LSID http://zoobank.org/urn:lsid:zoobank.org:act:F4ACE4EB-4872-43C8-8997-BD4 0CCBE17EE

**Table 3.** Measurements (in μm) and *sc* values of selected morphological structures of adult females of *Bryodelphax mareki* **sp. nov.** mounted in Hoyer's medium (N—number of specimens/structures measured; RANGE refers to the smallest and the largest structure among all measured specimens; SD—standard deviation).


**Figure 1.** *Bryodelphax mareki* sp. nov.: habitus: (**A**) dorsal projection (holotype, PCM); (**B**) dorsal projection (SEM); (**C**) lateral projection; arrow indicates papilla-like structure on leg I, arrowhead indicates papilla on leg IV (SEM). Scale bars in μm.

**Figure 2.** *Bryodelphax mareki* sp. nov.: (**A**) dorso-lateral view of the details of dorsal plates (paratype, PCM); (**B**) close up of the head plate (holotype, PCM); (**C**) close up of the pair plates II (holotype, PCM); (**D**) close up of the head and scapular plates (SEM). Scale bars in μm.

**Figure 3.** *Bryodelphax mareki* sp. nov.: ventral plates: (**A**) two ventral plates under head (filled arrowheads) (paratype, PCM); (**B**,**C**) three ventral plates around gonophore (empty arrowheads); asterisk indicates gonophore (paratypes, PCM and SEM, respectively); (**D**) ventral projection visible in SEM; filled arrowheads indicate two ventral plates under head, empty arrowheads indicate ventral plates around gonophore. Scale bars in μm.

**Figure 4.** *Bryodelphax mareki* sp. nov.: (**A**,**B**) claws of leg I with visible papilla-like structure (arrow) (paratypes, PCM and SEM, respectively); (**C**,**D**) claws of leg IV; arrowhead indicates papilla on leg IV (paratypes, PCM and SEM, respectively). Scale bars in μm.

> *Type Locality*: 51◦24 21" N, 116◦14 27" W, 1900 m asl, Canada, Alberta, Banff National Park, near east end of the Louise Lake, moss on stone, May 2019, leg. Milena Roszkowska and Łukasz Kaczmarek.

> *Material examined*: The 74 animals, i.e., holotype + 73 paratypes (females: 37; undefined sex: 34 and 2 exuviae) mounted on microscope slides in Hoyer's medium, 40 animals prepared for SEM and 20 animals prepared for molecular analyses (not included in the type series). However, DNA sequences were obtained from only five specimens (exoskeletons) which was later mounted on microscope slide in Hoyer's medium and included into type series.

> *Type depositories*: Holotype (CN8.62) and 76 paratypes (slides: CN8.\*, where the asterisk can be substituted by any of the following numbers: 46–55, 65–66, 17/S, 21/S, 22/S, 25/S, 28/S) are deposited at the Department of Animal Taxonomy and Ecology, Institute of Environmental Biology, Adam Mickiewicz University in Pozna ´n, Uniwersytetu Pozna ´nskiego 6, 61-614 Pozna ´n, Poland. Two paratypes (two females; slides CN8.63 and CN8.64) are deposited in the Natural History Museum of Denmark, University of Copenhagen.

> *Etymology*: The authors would like to dedicate this species to famous biochemist and last author's friend—Professor Marek Michalak, Faculty of Medicine and Dentistry, Biochemistry Department, University of Alberta, Edmonton, AB, Canada.
