
Left column, top to bottom: Nereus Light Cruiser, Scorpio Destroyer, Oceanid Support Destroyer, Urchin Frigate, Wasp Gunship.
Right column, top to bottom: Cyclopes Battleship, Trilobyte Battleship, Roc Heavy Cruiser, Cancer Cruiser.
In this case, the Cruiser classes represent vessels between the in-game destroyers and battleships in capability. The Nereus is basically an overarmed destroyer, although it is actually faster. The Cancer hasn't got much armor but it is tougher, and the Roc is more of a battleship that didn't make the grade.
http://www.wyrdysm.com/battleshipsforev ... Fleet1.zip
In-game descriptions are included. Gameplay feedback appreciated.