New species of Sinamia discovered

Nov 06, 2012
New Species of Sinamia Found From Western Liaoning, China
Holotype of Sinamia liaoningensis (IVPP V 14608) in left lateral view. Credit: ZHANG Jiangyong

According to a paper published in the latest issue of Vertebrata PalAsiatica 2012 (4), Dr. ZHANG Jiangyong, Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences, described a new species of sinamiid fish, Sinamia liaoningensis, from the Barremian-Aptian Yixian and Jiufotang formations of western Liaoning, China. This finding helps better understand the evolution and biogeographic distribution of sinamiid fish.

The reveal three commonly shared features (synapomorphies) of the Sinamiidae: the presence of only a single median parietal, three pairs of extrascapular bones, and short dermopterotic about equal in length to parietal length. Therefore, the new fish belongs to the family Sinamiidae undoubtedly.

New Species of Sinamia Found From Western Liaoning, China
Cross section of the scales of Sinamia liaoningensis.Credit: ZHANG Jiangyong

The new species was attributed to Sinamia based on the relative small postinfraorbitals, a long dorsal fin and rhombic scales.

Sinamia liaoningensis is a very large fish and has a much more podgy body form than the other species of the genus. It differs from all other species of the genus in the shape of the rostral, nasal, preopercle, the size and shape of infraorbitals, more subinfraorbitals (3), less dorsal fin rays (18), more caudal fin rays (16), more scale rows (32) between the origin of the anal fin and the dorsal margin of the body, and lack of serrated scales. The anterior half of the caudal fin rays of S. liaoningensis has remains of thin fibrous actinotrichia.

"Thanks to the extensive excavations for and birds in recent years, many specimens of Sinamia were discovered from both the Jiufotang and Yixian formations of western Liaoning and neighboring areas, including some exceptionally well preserved ones. This makes it possible to carry a detailed morphological study of the fish", said ZHANG Jiangyong.

Explore further: Social media & archaeology—a match not made in heaven

Related Stories

New leuciscin fish found in northern China

Jun 02, 2011

SU De-Zao, a retired paleoichthyologist of Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, found a new paleogene leuciscin fish, Tianshanicus liui sp. nov., in the ...

The battle to identify the world's smallest vertebrate

Sep 17, 2012

More and more really tiny species are being discovered, like a 7.9mm fish in 2006 and a 7.7mm frog in 2011. There's increasing competition for the title of the 'world's smallest vertebrate', but exactly how ...

New genus of Eugaleaspidiforms found in China

Feb 15, 2012

In a study published in the latest issue of of Vertebrata PalAsiatic [2012(1)], paleontologists from Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences in Beijin ...

How fish swim: Imaging device shows contribution of fins

Apr 22, 2011

There are fish tales and then there are fish tails. And a report from Harvard researchers in the current issue of the journal Biology Letters seems to demonstrate that previous theories about how bony fish mo ...

First images of 4 new spiny eels

Feb 25, 2010

(PhysOrg.com) -- The first images of live individuals of 4 new spiny eels are revealed by a Natural History Museum scientist today.

Recommended for you

Social media & archaeology—a match not made in heaven

1 hour ago

Archaeologists are avid users of social media, as well as online crowd-based funding and content-sourcing tools—deploying them to save sites, sustain the historic environment and protect history, often ...

Rewriting the history of the Boaz mastodon

6 hours ago

Through a combination of modern-day scientific sleuthing, historical detective work, and a plethora of persistence, researchers at the University of Wisconsin-Madison have rewritten the story of a celebrated ...

More than two dozen articles provide insights on mummies

May 22, 2015

In a special issue, The Anatomical Record ventures into the world of human mummified remains. In 26 articles, the anatomy of mummies is exquisitely detailed through cutting edge examination, while they are put in historical, archeo ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.