Opus tessellatum mosaic (3rd century); the refers to the mainly vertical rows in the main background behind the animal, where tiles are not also aligned to form horizontal rows.
Opus sectile i opus tessellatum.
MAN. Busto masculino, finales del siglo II. Mosaico de decoración arquitectónica. Mármol y caliza, opus tessellatum, 88 X 85. Procede de Aranjuez, Madrid. | by c0ntraband
opus sectile flooring from the house of the faun. materials were cut and placed into floors and walls to create patterns. this was a moderately expensive type of flooring.
Octavia Cook, Ponytail Opus Tessellatum, 2009
Rimini, mosaico di una domus, in opus tessellatum, appartenente a un grande armatore
Roman cat mosaic from early part of 1st century B.C.