JURASSIC DINOSAUR FAUNAS IN ZIGONG - 自贡恐龙博物馆

with an expanded dorsal end; well developed postparapophysis.
Material 3 dorsals just with neural arches and spines. ZDM 5032.
Locality and horizon Dashanpu, Zigong; Xiashaximiao Formation, Middle Jurassic.
Order Ornithischia
Suborder Ornithopoda
Family Fabrosauridae Galton, 1972
Genus Xiaosaurus Dong et Tang, 1983
Diagnosis As for type species Xiaosaurus dashanpensis Dong et Tang, 1983
Xiaosaurus dashanpensis Dong et Tang, 1983
Diagnosis Small cursorial ornithopod recognized by laterally compressed teeth with
Buddha’s-hand-like outline and symmetrical medial and lateral surfaces; tooth crown lacking
wear surface and vertical ridge; serrated anterior and posterior margins of teeth; undeveloped
cingula of teeth; straight and slender humerus with undeveloped deltopectoral crest; lesser
trochanter of femur lower than femoral head and greater trochanter; lower positioned fourth
trochanter forming a fan-like crest that attains an index of 0.53; short tibia about 1.1 times of
femur length; Metatarsal III about 64% of femur length; slender and straight pedal phalanges.
Holotype A damaged maxilla, a complete tooth, 2 cervicals, 4 caudals, left humerus, and
complete right hindlimb. IVPP V 6730A (field no.: Cr. 003).
Referred material Two teeth, a dorsal, 2 articulated sacrals, some ribs, complete right
femur, and some digits. IVPP V 6730B.
Included material A complete humerus. ZDM 6015.
Locality and horizon Dashanpu, Zigong; Xiashaximiao Formation, Middle Jurassic.
Genus Agilisaurus Peng, 1990
Diagnosis Small primitive ornithopod with a body length of about 1~2 m. It is
characterized by short but deeper skull; long nasal with a longitudinal median depression;
posterior process of premaxilla no contact lachrymal; maxilla and dentary with remarkable
depression marking for M. buccinatoris; higher coronoid eminence of mandible; scapula shorter
than humerus; forelimb less than 1/2 of length of hindlimb; lower positioned less trochanter of
femur; metatarsal III more than 1/2 of femur length.
Type species Agilisaurus louderbacki Peng, 1990.
Agilisaurus louderbacki Peng, 1990
Diagnosis Small cursorial primitive ornithopod recognized by short but deeper skull,
strongly contracted interfenestral region of parietal; long nasal with a longitudinal median
depression; posterior process of premaxilla no contact lachrymal; slightly dorsally positioned
antorbital vacuity; orbit positioned laterally in posterior half of skull; quite well developed
palpebral bridging over orbit; robust quadrate with transversely expanded mandibular condyle;