Meridiosignum macquariensis Just & Wilson 2021, sp. nov.

• Main Authors: Just, Jean, Wilson, George D. F.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Paramunnidae; Meridiosignum; Meridiosignum macquariensis; Macquarie Island
• Online Access: https://doi.org/10.5281/zenodo.4697834; http://treatment.plazi.org/id/03C487E3783E6432FF09EC97EADEFE1B

Meridiosignum macquariensis sp. nov. (Figs 14–15) Type fixation . Holotype , ♀, AM P76943.—Here designated. Type locality . Macquarie Island, Australia. Etymology . The species is named for the type location, Macquarie Island. Material examined. Holotype , ♀, 1.5 mm. Australia, Macquarie Island, Aerial Cove, 54°29’S, 158°57’E, 3– 4.5 m, fine sediments in cracks and crevices and under rock overhangs, and coarse sediments from small sediment patches on level bottom, stn MA–382, AM P76943. Paratypes . Same data as holotype, AM P76944 (29 ♀, 20 ♂; T ♂ of 1.3 mm illustrated). Australia, Aerial Cove, Macquarie Island, 54°29’S, 158°57’E, 5 m, sponges and bryozoans from sheltered base of vertical rock face near cove entrance, Codium dominant alga, J.K. Lowry (SCUBA), 12 December 1977, stn MA108, NMV J52116, (2 adult ♀). Australia, Aerial Cove, Macquarie Island, 54°29’S, 158°57’E, 6 m, red algae on rocks, D.S. Horning (SCUBA), 2 February 1978, stn MA–384, NMV J52120 (1 ♀). Description. Body width 0.55 length in female, 0.53 length in male, widest in female at pereionite 3, widest in terminal male at pereionites 2–3. Head slightly longer in male than female, length in male 0.5 width, in female 0.58 width; length posterior to eyestalks 2.0 anterior length in male, 1.3 in female. Frontal margin shallow convex, almost straight medially with angular lateral margins adjacent to antennae. Eyestalks in female length 1.7 width, in male 2.5 width, slightly expanded distally, apex rounded, long axis angling forward at approximately 40° in male, 30° in female. Mandible body with single lateral seta at place of normal palp. Pereionite 1 of terminal male enlarged, sagittal length in terminal male 2.6 pereionite midline length, in female 2.5 midline length; lateral margins rounded, except tiny mid-lateral spine in male; pereionites 2–4 lateral margins concave with rounded anterior and posterior corners; pereionites 5–7 bluntly pointed. Coxal plate 1 in terminal male with short anterior rounded projection. Coxae otherwise not visible on ...