Semi-Vegetarians

Semi-vegetarians eat no red or white meat (beef, pork, venison, etc). The only animals that semi-vegetarians eat are fowl and fish.

(Purists would say that semi-vegetarians are not vegetarians at all.)

 * crusto-vegetarian - eats crustaceans

 * ento-vegetarian - eats insects

 * mollo-vegetarian - eats mollusks

 * pescatarian - eats fish

 * porco-vegetarian - eats pork

 * repto-vegetarian - eats reptiles

Ovo-Lacto Vegetarians

The most common type, ovo-lacto vegetarians do not eat any animals, but do eat eggs and dairy products.
Subcategories: 
 * Ovo vegetarians (eat eggs but not dairy)
 * Lacto vegetarians (eat dairy but not eggs)

Vegans

Vegans eat no animal products - no eggs, no dairy, no honey, etc.

Raw/Living Foodists

Raw or Living Foodists eat only raw food, because enzymes are destroyed by normal cooking processes.

Fruitarians

Fruitarians eat only fruit, fruit-like vegetables (e.g., tomatoes, cucumbers), and sometimes seeds and nuts.