Historical clue formulations

• Colorful marine creature ... or a phonetic hint to the circled letters in 17-, 23-, 35- and 48-Across — 2024-07-15
• Colorful marine invertebrate — 2023-10-30
• Radially symmetric creature — 2011-07-09
• Tentacled creature — 2000-02-12
• Colorful marine creature — 1996-03-23
• Tentacled creature — 1996-02-11