Tarantula class

The was a class of dreadnought used by Tholian Assembly space forces in the 2400s. 

History
Tarantula-class ships took part in a number of battles in 2409. Five of them led separate raids on Starfleet and Klingon Defense Force starbases. These were destroyed. 

Other Tarantula-class ships guarded captured Romulan Republic starships at a base in the Azure Nebula. 

Two more arrived at the Vault after defending forces disrupted a Tholian attempt to encase the space station in a Tholian web and drag it into an alternate universe. The defenders destroyed these vessels as well. 

Several more vessels appeared in the Tau Dewa sector block and destroyed a Borg fleet, then attacked Romulan Republic-allied forces responding to the Borg sighting. These, too, were destroyed. 

Tarantula-class vessels were holographically duplicated in one version of Combat Simulation 347 as one of several classes of Tholian ships attacking a civilian transport. 

Alternate timeline
In an alternate 2409 created by the USS Enterprise (NCC-1701-C) traveling forward in time rather than backwards after entering a temporal vortex, a Tarantula-class vessel attempted to prevent the Enterprise from escaping a Tholian space station and returning to 2344. It was destroyed by the Enterprise and the USS Pastak.