| Summary: | Macrobiotus ovovittatus sp. nov. urn:lsid:zoobank.org:act: 9C2931D3-8EBE-47AB-A3B0-991AB28F03A2 Figs 1–8, Tables 2–3 Etymology The species name refers to the terminal discs of the egg processes which resemble crocheted napkins. From the Latin “egg” = “ovo” and “chaplet” = “vittatus”. Material examined 32 animals, 57 eggs mounted on microscope slides in Hoyer’s medium, 15 animals and 15 eggs examined under SEM, 15 animals stained with orcein and two animals processed for DNA sequencing. Type material Holotype GREENLAND • near Zackenberg Valley; 74°29′0.766″ N, 20°32′18.308″ W; 77 m a.s.l.; Jul. 2021; M. Kolasa leg.; mixed sample of moss and lichen collected from the rock in arctic tundra; ISEA PAS, slide GL.001.01. Paratypes GREENLAND • 46 animals; same collection data as for the holotype; ISEA PAS, slides GL.001.01 to GL.001.03, SEM stub TAR.015 • 72 eggs; same collection data as for the holotype; ISEA PAS, slides GL.001.04 to GL.001.09, SEM stub TAR.015. Description Animals Body transparent in juveniles and white in adults, after fixation in Hoyer’s medium transparent (Fig. 1A). Eyes present. Round and oval pores (0.4–0.6 μm in diameter), scattered randomly throughout the cuticle (distributed more sparsely on the ventral side of the body) (Figs 1B–E, 2A–B), including the external and internal surface of all legs (Fig. 3A–F). Granulation is present on the entire body cuticle and clearly visible under PCM and SEM, with granulation on the ventral side of the body being less dense (Figs 1B– E, 2A–B). Moreover, evident dense granulation patches on the external and internal surface of all legs I–III are visible under PCM and SEM (Fig. 3A–D). This dense granulation is also present on the lateral and dorsal surfaces of legs IV (Fig. 3E–F). A pulvinus-shaped cuticular bulge is centrally present on the internal surface of all legs I–III (Fig. 3C–D). This structure is visible only if the legs are fully extended and well oriented. Claws small and slender, of the hufelandi type (Fig. 4A–F). Primary branches with distinct ...
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