Gremlin Industries was an American arcade game developer and manufacturer who manufactured wall games in the early 1970s before switching to video games starting 1976. In 1979, they were purchased by Sega, and started releasing games with joint branding, first as Gremlin/Sega, then as Sega/Gremlin.
December 1981 saw Sega's US arm moved from Gulf+Western's manufacturing division into the hands of subsiduary Paramount Pictures, and in to avoid confusion, Gremlin changed their name to Sega Electronics in 1982. Around which time they also started producing games for home systems, attempting to bring Paramount brands to home consoles (Star Trek: Strategic Operations Simulator and Buck Rogers: Planet of Zoom being the two surviving examples, though many more were planned).
Thanks in part to the North American video game crash, Sega Electronics was shut down in early 1984 and its manufacturing assets transferred to Paramount Studios.
|Sega Development Studios|
|Japan R&D; 1982-1983|
|Sega Research and Development|
|Japan R&D; 1984-1988|
|Japan R&D; 1988 - 1990|
| Sega R&DD1 | Sega R&DD2 | Sega R&DD3 | Sega R&DD4 | Sega R&DD5 | R&DD6 | Sega R&DD7 | Sega R&DD8|
|Japan AM; 1990 - 2000-ish|
|"Arcade" R&D||"Consumer" R&D|
|Sega AM1 | Sega AM2 | Sega AM3 | Sega AM4 | Sega AM5||| Sega AM9 | Sega AM10? | Sega AM11|
|Japan AM; 2000-ish - 2004-ish|
|WOW Entertainment | Sega AM2 | Hitmaker | Amusement Vision | Sega Rosso | Smilebit | Overworks | Sonic Team | United Game Artists | Sega Mechatronics|
|Japan; 2004 onwards(?)|
|Sega WOW | Sega AM2 | Sonic Team | Sega Sports Design | Ryu ga Gotoku Studio | AM Ishoku Team
First CS R&D | Second CS R&D | Third CS R&D
|Japan non-AM, demerged, and defunct|
|Puyo Puyo Sega | Sega Networks | ???
Demerged: Sonic! Software Planning | Nextech | SIMS | ???
|Three Rings Design | ???|
|The Creative Assembly | Sports Interactive | Hardlight | Relic Entertainment|
|Sega of China|
|Sega Away Team|