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Sacoproteus nishae Krug, Wong, Medina, Gosliner, & Valdes, 2018
 
Sacoproteus nishae
Maximum size:  15-20 mm.

Identification:  This is a relatively large species with small tubercles on the inner surfaces of its cerata and white tips on its rhinophores. It is similar to Sacoproteus smaragdinus in that regard but has more spherical cerata, more white pigment and an incomplete green line on the top of its head.

Natural history:  Sacoproteus nishae is known from one animal found at about 1 m (3 ft). (Note 1)

Distribution:  Kauai: widespread in the Pacific.

Taxonomic notes:  It was first recorded in Hawaii from Anini Beach, Kauai by Cassidy Grattan on Feb. 16, 2018. There's some question about lumping the Hawaiian population with those from elsewhere in the Pacific.

Photo:  Cassidy Grattan: 15-20 mm; some central cerata autotomized: Anini Beach, Kauai; Feb. 16, 2018.

Observations and comments:

Note 1:  Cassidy Grattan reported that it was found at night in a resting posture similar to the resting posture of Ercolania cf. coerulea. He also said it autotomized some of its central cerata while being handled.
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