Covered Tetran is the Tetran variant that appears in Gradius IV. It is the only Tetran that has destroyable arms. In fact, destroying all it's arms kills it.
Covered Tetran flails its arms for a few seconds after appearing. During this time, it is invulnerable, even though the core is open. After this, it slowly rotates its arms around the main core, like the normal Tetran. Unlike the normal Tetran, it fires both bullets and mines. These mines can be destroyed, however. Once two arms are destroyed, it will begin to spin them around it's body rapidly, making it difficult to approach. It will spin it's last arm faster to compensate for the lost ones. Covered Tetran is actually very difficult to destroy properly. Most people destroy the arms, which kills it anyway.
|Stages||Liquid Metal • Plant • Bubble • Magma • Moai • Cell • High Speed • Boss Rush • Final Fortress|
|Bosses||Yorogaton Chimera • Dendrodium • Bubble Core • Gillador • Alpha/Omega • Berial • Rolling Core • Vanishing Core • Big Core MK III • Covered Tetran • Berserk Core • Planet Core • Bloody Gate • Crab-II • Gofer|
|Big Cores||Big Core MK I • Big Core Rev. 1.2 • Big Core MK II • Big Core MK II Kai • Big Core MK III • Big Core MK IV|
|Big Core variants||Beacon • Blaster Cannon Core • Bubble Core • Circle Core • Coreship • Crater Core • Crystal Core • Dellinger Core • Desert Core • Heaven's Gate • Juggler Core • Lizard Core • Neo Big Core • Perla Meralda • Rexion Core • Rolling Core • Shining Core • Super Big Core • Terra Core • Vanishing Core • Viva Core • Genocide Core • Odin Core|
|Core-style bosses||Abaddon Warship • Bubble Eye • Covered Core • Covered Core MK II • Dead End • Kraken • Mayhem Warship • Metal Slave • Misfit Warship • Queensrÿche • Riot Warship • Plate Core|
|Pseudo-Cores||Death • Death MK II (DeathDouble) • Death MK III • Beta Core • Nobil • Triple Core • Crash Bam|
|Tetran variants||Tetran (Zylom) • Covered Tetran • Crystal Core D-X02 • Laser Tetran • Tenny Rop|