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Malagazzia hirsutissima Akiyama, Horinouchi, & Kubota, 2013 Fig. 7 Common Japanese name: watage-kurage Material examined. Voucher 1: Japan – two whole medusae specimens preserved in 5 % formalin solution, juvenile, umbrella diameter 1.0– 1.4 mm; cultured at the Kuju-kushima Aquarium reproduced from the polyps; preserved on alternate days starting from polyp generation from 11 Sep. 2024; Hisashi Akiyama; collected from the tank; NMST-Co 1938. Voucher 2: Japan – part of the polyp colony preserved in 5 % formalin solution; cultured at the Kuju-kushima Aquarium; 11 Sep. 2024; Hisashi Akiyama; collected from the tank; NMST-Co 1939. Description. Adult medusa: see Akiyama et al. (2013). > Polyps (NSMT - Co 1939; Fig. 7 C, D): polyp shape almost resembling that of Malagazzia michelin. Colonies stolonal; arising from creeping hydrorhiza. Stolons long, slender, smooth, giving rise to short pedicels. Hydrothecal pedicels usually smooth, slender, approximately 1.0– 1.4 mm in length and 0.7–1.0 mm in width, with a conical operculum formed by numerous convergent segments; tentacles arising from hydranth approximately 16–20, slender; gonotheca shaped like a rice-grain, approximately 0.6 mm in length and 0.2 mm in width, with rounded distal end, gradually tapering towards proximal end, arising from stolon or base of hydrothecal pedicels. Development of juvenile medusae (NSMT - Co 1938; Fig. 7 A, B): Day 1: umbrella diameter and height of just-released medusa approximately 0.7–0.9 mm. Mesoglea approximately 1 / 8 as thick as umbrella height. No gastric peduncle and gonads. Manubrium small, cylindrical, approximately 1 / 2 in length as umbrella height. Mouth with small lips. Radial canals four, already connecting both to manubrium and umbrella margin. Tentacle bulbs four, same size. Tentacle on each of four bulbs, slender, 2–3 mm in length, with scattered nematocyst-like particles. Small, wart-like structures (primary rudimentary bulbs potentially developing into tentacular bulbs) present between each bulb, and eight statocysts on margin. One statolith in each statocyst. Scattered nematocyst-like particles on umbrella surface. During rearing at the Kuju-kushima Aquarium, the maximum developmental size of M. michelin was 13.6–16.6 mm in diameter. Different from M. michelin, this species developed nearly to the size of medusae obtained from the wild sea. It took approximately 3 months at 20 ° C to reach this maximum size.