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

higher coronoid eminence of mandible; lower positioned articular cavity; absence of external
mandibular fenestra; dental formula Pm5 + M14 / D20; premaxillary teeth and first three dentary
teeth recurved and canine-shaped while remaining dentary teeth and maxillary teeth diamond or
leaf shaped with wear surface of varied degree; 9 cervicals, 15 dorsals, 5 sacrals, and at least 45
caudals; neck and trunk short while tail longer than half of its body length; ossified tendons
confined to trunk and hip; scapula shorter than humerus; long ilium with a extraordinarily
developed supra-acetabular flange; slender and rod-like postpubis; proximally placed obturator
process of ischium; lesser trochanter of femur lower than greater trochanter, and presence of a
deep cleft between them; pendent fourth trochanter of femur with a nutritive foramina at its base
medially; tibia longer than femur; matatarsal III longer than 1/2 of femur length; pedal
phalangeal formula 2-3-4-5-0; all pedal digits clawed.
Holotype A skeleton with completeness more than 90% including very complete skull and
lower jaws, articulated vertebrae, and most of bones of girdles and limbs. ZDM 6011.
Locality and horizon Dashanpu, Zigong; Xiashaximiao Formation, Middle Jurassic.
Agilisaurus multidens (He et Cai, 1983)
Diagnosis Small cursorial primitive ornithopod recognized by small, short but deep skull;
relatively short snout; large orbit slightly anteriorly positioned; small and triangular antorbital
vacuity lower positioned and enclosed medially; large infratemporal fenestra; extraordinarily
developed occipital crest; straight ventral margin of jugal; much more cheek teeth with obvious
lateral ridges, but without median ridge; scapula shorter than humerus; forelimb less than 1/2 of
length of hindlimb; lower placed less trochanter of femur; tibia about 118% of femur length;
metatarsal III more than 1/2 of femur length.
Holotype A nearly complete articulated skeleton including skull, presacrals, sacrals, 14
caudals in the anterior portion, and most of bones of girdles and limbs. ZDM 6001 (field no.:
T6001).
Paratype An incomplete skeleton including a pair of maxillae with teeth, a pair of
dentaries with teeth, some dorsals and caudals, right scapula, right humerus and ulna, left ilium,
part of right ilium, and right prepubis, incomplete left and right femora, both tibiae, left fibula,
both astragali, some metatarsals and digits. Field no.: T6002. It was housed in the museum of
Chengdu University of Technology.
Locality and horizon Dashanpu, Zigong; Xiashaximiao Formation, Middle Jurassic.
Suborder Stegosauria
Family Stegosauridae Marsh, 1880
Subfamily Huayangosaurinae Dong et al., 1982
Diagnosis Small to medium sized stegosaur diagnosed by well developed jugal; 2~3
supraorbitals; presence of premaxillary teeth; presence of antorbital vacuity; mandible with
external mandibular fenestra and prominent coronoid eminence; low dorsal neural arches; sacral
foramens not enclosed; femur a little longer than humerus with undeveloped fourth trochanter;