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In the morning (9:00) of 18 June 2011 (sunrise: 5:55, sunset: 19:34), the simul taneous spawning of two distantly related species of scleractinian corals was ob served in Ishigaki Island (24°27′38′′ N, 124°12′20′′ E), the southernmost region of Ryukyu Islands, Japan. The observed species were the hermaphroditic spawner Pocillopora verrucosa and the gonochoric spawner Goniopora djiboutiensis (Fig. 1). Morning-time spawning of Goniopora corals is the first record in the world. Both male (ejected sperms) and female (ejected eggs) Goniopora colonies were found within a single ridge at the reef slope (Fig. 2). Although a broad survey could not be conducted, at least 5 or 6 colonies ejecting sperms or eggs were found along a few ridges. Small fishes such as damselfish aggregated around spawned colonies, suggesting that they might feed on the eggs and sperms of corals. Most scleractinian corals spawn during night-time, such as the mass spawning of Acropora corals (e.g., Babcock et al. 1986). Recently, there are some reports on corals spawning at daytime. Thus far, it is known that Porites rus released sperm in the noon in Chumbe Island in Zanzibar, Western Indian Ocean (Bronstein and Loya 2011), Diploria labyrinthiformis spawns just before sunset in the Caribbean (Muller and Vermeij 2011), and Goniastrea australensis spawns in the afternoon (16:00-17:00) in the Great Barrier Reef (Kojis and Quinn 1981). Moreover, P. verrucosa and P. eydouxi spawn (first released sperm and then negatively buoyant eggs) in the early morning (approximately 1 h after sunrise) in Okinawa, mainland of Ryukyu Islands (Kinzie 1993, Hirose et al 2000) and also the central Red Sea (Bouwmeester et al. 2011). In other gonochoric spawners, Pavona sp. also spawned (ejecting only sperms) in the noon in the Gulf of Thailand (Plathong et al. 2006), and Pavona decussata spawned just 1-2 hours before sunrise in Kochi (Mezaki unpublished data), respectively. Although P. damicornis has different reproductive manners Simultaneous spawning of Pocillopora and Goniopora corals in the morning time