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DescriptionTheocorys borealis: Cephalis hemispherical, with a short triangular horn and large, irregular, rounded pores. Thorax pear-shaped, with regular, circular, pores, as broad as the bars, quincuncially arranged (4 in 0,01mm). Abdomen short, narrower than the thorax, with some few, irregular and scattered pores. Mouth somewhat constricted, sometimes with a hyaline peristome. Length of cephalis 0,015mm, of thorax 0,03mm, of abdomen 0,01 to 0,015mm. Breadth of thorax 0,045mm. Diameter of the mouth 0,027mm.