Tatsunoko Production Co., Ltd. (but generally referred to as Tatsunoko Pro.) is one of the notable and famous Japanese animation studios back during the Golden Age of Anime. Founded in October 19, 1962 by one of the animation pioneers Tatsuo Yoshida along with his brothers Kenji and Toyoharu, the studio began to produce anime occupying various genres. The name Tatsunoko even has a double meaning, with tatsu no ko meaning Tatsu's Child (as in Tatsuo's child) and tatsunoko meaning sea-dragon (which is generally referred to a seahorse), hence the logo.
Over the years, Tatsunoko Pro. has produced many anime, most of which are memorable (especially if you are Japanese). Even countries like France and Italy got most of their stuff, including Yatterman and Hutch the Honeybee. They generally produced a lot of stuff during the 70's and 80's, and slowed down during the 90's, in which they focused more on remakes and co-worked with other studios and animated shows for other companies. Around 2005, they were bought by Takara, which then became a full subsidiary when Takara merged with TOMY.