O. exigua

O. exigua may refer to:


 * Ophiothrix exigua, a brittle star
 * Oplitis exigua, a mite with a single pair of spiracles positioned laterally on the body
 * Oreodera exigua, a longhorn beetle
 * Orthomecyna exigua, a moth endemic to Hawaii
 * Oryzopsis exigua, a true grass
 * Oscinella exigua, a European fly
 * Osminia exigua, a clearwing moth
 * Ozola exigua, a geometer moth