opus vermiculatum---taken from the latin word 'worm.' It refers to lines of tesserae that snake around a feature in the mosaic. Often 2-3 rows of opus vermiculatum appear like a halo around something in a mosaic picture, helping it stand out from the background.
200-100 BCE Alexandria Egypt. Floor Mosaic Roundel: A Dog & An Overturned Gold Vessel. The quality is fantastic, and this period represents a high point in the mosaic craft in the Greco-Roman world. Many of the tesserae are only 1-2mm across, which allows the mosaicist to achieve a painterly effect. The technique is called "opus vermiculatum", or ‘wormy work’. The Greco-Roman Museum in Alexandria. I can't help but wonder if this wasn't the inspiration for RCA Victor's "His Master's Voice".
Floor mosaic depicting birds, fish and fruit basket. Opus vermiculatum, Roman artwork of the end of the Ist century AD/begin of the Ist century BC. National Museum of Rome.
Opus vermiculatum in the National Museum is a floor mosaic with a cat and two ducks from the late Republican era, first quarter of the 1st century BC. House cats were considered to be both useful and reverent to Roman society.
Opus vermiculatum - definition in the mosaic glossary
-2eS, Pompéi, Maison du Faune, Salle 34 Triclinium 1er STYLE Opus Vermiculatum: EROS ailé avec emblèmes dionysiaques chevauchant un Lion. Emblèmes: Âge d'or (coupe) + Bonheur dionysiaque (vin). Tradition grecque de célébration du Banquet