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Biology

Hippocampus severnsi is known from Indonesia (Bunaken, Wakatobi, Raja Ampat Islands, Kawe Island), Japan (Ryukyu Islands), Papua New Guinea (Milne Bay, Madang), Solomon Islands (Mborokua) and Fiji at depths of 8-20 m. It has been observed both during the day and the night but is apparently more active in the morning and late afternoon when it is not in direct sunlight (Müller, pers. comm.). In Indonesia it has been recorded in association with a yellow coloured bryozoan, Catenicella sp., on different kinds of hydrozoans including Lytocarpus phoenicea, Antennellopsis integerrima and Halicordyle disticha (Müller, pers. comm.) as well as in sheltered spots on a reef wall in association with Halimeda (Brett, pers. comm.). It is also recorded from fissures on current–swept walls where it will tend to occur on the side of the fissure that faces away from the current, but in all cases where there is some upward current (Müller, pers. comm.) and has been seen swimming over a fungiid coral (Hardt, pers. comm.). In Papua New Guinea it has been observed in a healthy reef passage with a regular current of up to two knots on a gorgonian of the genus Muricella at 12 m depth (Halstead, pers. comm.) and in Fiji it was found on gorgonian species, possibly Menella sp.? (Tackett, pers. comm.) The holotype of H. severnsi, collected in June, had approximately 11 embryos within its pouch (Ref. 79848).

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