Radio X-Philes

Ionizing-radiation-resistant organisms (IRROs) are organisms for whom more than 1,000 Gy (100,000 rd or CGS) of ionizing radiation (IR) are needed to achieve 90% reduction.

Truly radiophilic organisms, who reproduce better in the presence of ionizing radiation than without it, have not yet been conclusively proven to exist, however several genera are suspected to be radiophilic.

Many radioresistant organisms do not have specific adaptations for radioresistance, but are instead exapted ("pre-adapted") to it as an incidental side-effect of thermotolerance and/or thermophily. For example, the archaeon Thermococcus gammatolerans inhabits submarine hydrothermal vent systems thousands of feet deep, strongly implicating them to be thermobarophiles who happen to be radioresistant, not true radiophiles.

Radioresistant Archaea & Archaeal Radiophiles
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Radioresistant Bacteria & Bacterial Radiophiles
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For the purposes of this list, the "high Gy" will refer to the maximum dose of radiation the organism has been shown to survive while remaining at least somewhat viable, while the optimal growth Gy (OGGy) will refer to the maximum dose the organism has been shown to survive without any observable loss in viability.

Archaea

Euryarchaeota

Thermococci

Thermococcales

Thermococcaceae

Thermococcus

Proteoarchaeota

Bacteria

Deinococcus-Thermus

Deinococci

Deinococcales

Deinococcaceae

Deinococcus

Proteoarchaeota