File:Psittacosaurus SMF R 4970 laser fluorescence (head and neck).png

English: Integument of the head and neck of Psittacosaurus SMF R 4970 under LSF. a Head and neck with inset showing the region depicted in a. b Close up of the right jugal horn. c Close up of the left jugal horn and dark region interpreted as the keratinous “horn”. Note the offset between the posterior edges of the jugal horn (black arrow) and the keratinous “horn” (black and white arrowhead). Close up on the integument of the head, from d the dorsomedial side of the left ramus of the mandible, directly ventral to the lower dentition; e the palatal region; and f the ventromedial side of the distal portion of the left ramus of the mandible. g Close up of the integument on the left side of the cervical vertebrae. h Detail of the squamous integument shown in f. i Detail of the right jugal horn (boxed region in b) with pigmented strips forming polygons (arrowheads). an angular, cv cervical vertebrae, de dentary, je jugal horn, kh keratinous “horn”, mx maxilla, qu quadrate. Scale bars equal 5 cm (a, c), 3 cm (b, d), and 5 mm (e, f).