The following section contains information from a previous version of StarCraft II which is no longer valid.
The swarm clutch is a now-canceled structure, similar to a proximity mine, consisting of a set of eggs laid by a zerg queen. It resembled a series of tubes. They hatched when enemies approach, attacking land and air units.
The swarm clutch had a slow but powerful attack, dealing high damage over time by launching suicidal "bugs". Swarm clutch units had low health. Shriekers extended the range of swarm clutches to anywhere within its own detection radius, and through careful positioning could effectively double their attack range in some cases.
The swarm clutch last possessed a size of 1x1. This was set to be increased to 2x2 in a later build.
The swarm clutch has been referred to as a sunken cluster; this is a misnomer.
StarCraft Legacy staff. 2008-03-11. Zerg - Units. StarCraft Legacy. Accessed 2008-03-14.
Zero. 2008-03-15. My Day at Blizzard. StarCraft Legacy. Accessed 2008-03-18.