You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Yang’s Zhongjian Bird Zhongjianornis yangi<br />
Time: 120 Ma ago Location: Liaoning, China Habitat: Jiufotang Formation (see above)<br />
Size: WS ~75cm (2.5ft); BL 30cm (1ft); TL unknown Features: Head small relative <strong>to</strong> body.<br />
Toothless beak short but slender & pointed. Wings large but w/ very small claws. Legs long<br />
compared <strong>to</strong> the similar confuciusornithids. Large, highly curved claws on the feet. Tail<br />
short. Biology: The presence of <strong>to</strong>othless beaks in this species & the overall similarity <strong>to</strong><br />
Schizooura may suggest a close relationship between the two. The ana<strong>to</strong>my of the feet &<br />
their large claws imply an ability <strong>to</strong> perch, & the lack of large wing claws suggests that they<br />
were adept at launching from the ground.<br />
Li’s Split-tail Schizooura lii<br />
Time: 120 Ma ago Location: Liaoning, China Habitat: Jiufotang Formation Size: WS<br />
65cm (2ft); BL 30cm (1ft); TL 55cm (1.8ft) Features: Head small & triangular w/ slender<br />
pointed bill. Jaws <strong>to</strong>othless & probably beaked. Neck slightly longer than skull. Wings<br />
large, w/ ulna & manus slightly longer than humerus (ulna over half the length of the<br />
<strong>to</strong>rso). Very long primary & secondary feathers resulting in broad, rounded wings. Small<br />
claw on alular digit. Major digit “claw” very small, blunt, & probably internal. Minor digit<br />
fused <strong>to</strong> major. Legs long, w/ tibia longer than femur & tarsus just over half tibia length.<br />
Toes relatively short & robust w/ robust but weakly curved claws. Fan-tail long, broad &<br />
triangular when exp<strong>and</strong>ed, with prominent fork. Biology: Probably ground foragers, as<br />
suggested by foot ana<strong>to</strong>my. Lack of teeth acquired independently of modern <strong>birds</strong> <strong>and</strong><br />
possibly, independently of <strong>other</strong> primitive euornitheans like Archaeorhynchus. Whereas<br />
some early euornitheans retained teeth in addition <strong>to</strong> a premaxillary & predentary beak,<br />
possibly <strong>to</strong> aid in catching & holding fish, the loss of teeth in species like this may indicate<br />
a non-piscivorous diet consisting of more grains or <strong>other</strong> plant material, &/or arthropods.<br />
The broad, forked tail would have been detrimental (or at least neutral) <strong>to</strong> flight ability &<br />
was probably used in mating displays. The strong, rounded wings are likely adaptations <strong>to</strong><br />
flying in a densely forested environment, & possibly <strong>to</strong> help compensate for the unwieldy<br />
tail feathers.<br />
Small-<strong>to</strong>othed Jianchang Bird Jianchangornis microdonta<br />
Time: 120 Ma ago Location: Liaoning, China Habitat: Jiufotang Formation Size: WS<br />
~60cm (ft); BL 34cm (1.1ft); TL unknown Features: Head triangular. Numerous small<br />
conical teeth in mid <strong>to</strong> rear jaws. Jaw tips beaked. Wings long w/ strong muscles anchored<br />
<strong>to</strong> keeled breastbone. Alular digit very long & strongly clawed. Major & minor digits bore<br />
very small claws. Minor digit fused <strong>to</strong> major. Feathers poorly preserved, but primary feathers<br />
over 15cm long. Legs short, w/ short tarsus ~equal <strong>to</strong> <strong>to</strong>es in length. Feet small w/ small,<br />
weakly curved claws. Biology: Evidence indicates these ate small fish including Jainichthys,<br />
& so probably foraged in or near lakes, though the relatively short tarsus & average-length<br />
tibia argue against a wading lifestyle. May have been surface swimmers or beachcombers.<br />
148