Lizard Alliance race icon from VGA Planets Nu

Race abilities

Ground Combat: 30:1 (offensive); 15:1 (defensive) - strongest in the game
2x faster mining
"Hiss" mission - ships with beam weapons can threaten colonists and natives on a planet to increase happiness by 5 points per ship per turn
Cloaking device on some ships - Reptile, Saurian, and Lizard
can take 150% damage on their ships (ships will explode after combat if damage is above 100% and if they are in orbit of a planet)

Ship List

Tech	Name	Mass	Fuel	Cargo	Crew	Engines	Beams	Torps	Bays	MC	Dur	Trit	Moly	Special
1	Small Deep Space Freighter	30	200	70	2	1				10	2	2	3
1	Serpent Class Escort	55	160	20	35	1	2			40	15	33	5
3	Neutronic Fuel Carrier	10	900	2	2	2				20	10	2	20
3	Medium Deep Space Freighter	60	250	200	6	1				65	4	4	6
3	Reptile Class Destroyer	60	120	50	45	2	4			50	22	33	15	Cloak
4	Eros Class Research Vessel	35	110	30	78	2	2			30	4	3	13	Terraform Ship (lowers temp)
4	Lizard Class Cruiser	160	330	290	430	2	4	3		190	42	81	30	Cloak
5	Vendetta Class Frigate	100	140	30	79	2	4	4		170	12	23	57
6	Large Deep Space Freighter	130	600	1200	102	2				160	85	7	8
7	Saurian Class Light Cruiser	120	260	150	336	2	4	2		85	32	67	23	Cloak
8	Loki Class Destroyer	101	140	80	265	2	2	4		170	10	20	43	Tachyon Device
9	Madonnzila Class Carrier	331	290	150	910	2	4		5	420	110	123	90
9	Neutronic Refinery Ship	712	800	1050	190	10	6			970	125	150	527	Alchemy Ship - 1 Supply + 1 Mineral -> 1 Fuel
10	Super Transport Freighter	160	1200	2600	202	4				220	125	13	18
10	T-Rex Class Battleship	421	490	190	810	2	10	5		350	140	153	100
10	Merlin Class Alchemy Ship	920	450	2700	120	10	8			840	625	250	134	Alchemy Ship - 3 Supplies -> 1 Mineral

Build an Eros starbase early on to pump out HISS-er ships. Every large cluster of planets should have one HISS starbase. Eros ships are 100mc each (ish) even if you outfit them with t5 engines (nice but not necessary).
Some players build tons of small deep space freighters late in the game to fill up the build queue, then recycle them for priority build points. The Lizards can do one better - build Serpents with tech-1 engines and beams and use them to HISSS! until you want to recycle them.
starbase-inna-can ships are extremely valuable for getting starbases up and running fast. Null-tech starbases can still pump out HISS ships, and you may not get the chance to make them later.
The T-Rex is a midrange attack ship, and is extremely cheap for its armament. Don't treat it like a heavy warship - it's in fact the least powerful tech-10 ship in the game. (Nevertheless it is superior to Fascists/Crystals (Diamond Flame)/Privateer and Fed (Missouri) main warship if you have a Lizard crew on board)
LCCs are awesome but they're heavy and they suck up fuel. Make lots, but be aware that scavenging for fuel in enemy territory is hard, particularly if you're gravid with troops.
Lizard players can win alliances by offering to HISSSS! other players' planets - have them tow a Serpent with tech-1 engines and beams to the planet of their choice. Note that you can't give your ships to them - you must be in control of them in order to HISSSS!