Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Situational Awareness; Communication Breakdown; Confusion; Other / Unknown; Workload
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Taxiway
Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented
Airport; Human Factors; Environment - Non Weather Related
Departing gate; we used the yellow line to exit the ramp; the clearance from Ramp Control was taxi to Spot X and contact Ground. Approaching Spot X; we contacted Ground and the clearance given was taxing to [Runway] 26R Via C. Instead of taking the second left onto [Taxiway] C we took the first left onto [Taxiway] Q from the yellow line. Once on [Taxiway] Q; ATC queried us about being on the incorrect taxiway and cleared us from [Taxiway] Q to join [Taxiway] C for [Runway] 26R.In the debrief we noted neither myself or the Captain saw a sign for [Taxiway] Q and only saw signs for [Taxiway] C and [Taxiway] B. Since the first sign we saw was [Taxiway] C it led us to believe the first Taxiway was C. Recommendation would be to make the sign for [Taxiway] Q more visible.
Air Carrier First Officer reported a taxi deviation due to poor marking and signage on this taxiway in LAS airport.