Insular iconography Style I
Carola Hicks defines Style I in her book Italic textAnimals in Early Medieval ArtItalic textas the earliest form of animal representation. In these representation, the animal is represented as a mosaic of fragmented bits and pieces. This early form gives way to Style II, which dominates in the later centuries.
Hicks, Carola. "The Sixth Century." Animals in Early Medieval Art. Edinburgh:Edinburgh University Press, 1993.