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Zhu, You-an
Publications (3 of 3) Show all publications
Pan, Z., Zhu, M., Zhu, Y.-a. & Jia, L. (2018). A new antiarch placoderm from the Emsian (Early Devonian) of Wuding, Yunnan, China. Alcheringa, 42(1), 10-21
Open this publication in new window or tab >>A new antiarch placoderm from the Emsian (Early Devonian) of Wuding, Yunnan, China
2018 (English)In: Alcheringa, ISSN 0311-5518, E-ISSN 1752-0754, Vol. 42, no 1, p. 10-21Article in journal (Refereed) Published
Abstract [en]

Wufengshania magniforaminis, a new genus and species of the Euantiarcha (Placodermi: Antiarcha), is described from the late Emsian (Early Devonian) of Wuding, Yunnan, southwestern China. The referred specimens were three-dimensionally preserved in black shales, allowing a high-resolution computed tomography reconstruction of anatomical details. The new euantiarch is characterized by a large orbital fenestra, an arched exoskeletal band around the orbital fenestra and a developed obtected nuchal area of the skull roof. Maximum parsimony analysis, using a revised data-set of antiarchs with 44 taxa and 66 characters, resolves Wufengshania gen. nov. as a member of the Bothriolepididae, which is characterized by the presence of the infraorbital sensory canal diverging on the lateral plate, and the nuchal plate with orbital facets. New analysis supports a sister group relationship between Dianolepis and the Bothriolepididae. Luquanolepis, a coeval euantiarch from the neighboring site of the new form, is referred to the Asterolepidoidei and represents the basalmost and earliest member of the Asterolepidoidei.

Keywords
Antiarcha, Placodermi, Early Devonian, HRCT scanning, morphology
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-350556 (URN)10.1080/03115518.2017.1338357 (DOI)000425669600002 ()
Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-05-16Bibliographically approved
Lu, J., Zhu, M., Ahlberg, P. E., Qiao, T., Zhu, Y.-a., Zhao, W. & Jia, L. (2016). A Devonian predatory fish provides insights into the early evolution of modern sarcopterygians. SCIENCE ADVANCES, 2(6), Article ID e1600154.
Open this publication in new window or tab >>A Devonian predatory fish provides insights into the early evolution of modern sarcopterygians
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2016 (English)In: SCIENCE ADVANCES, ISSN 2375-2548, Vol. 2, no 6, article id e1600154Article in journal (Refereed) Published
Abstract [en]

Crown or modern sarcopterygians (coelacanths, lungfishes, and tetrapods) differ substantially from stem sarcopterygians, such as Guiyu and Psarolepis, and a lack of transitional fossil taxa limits our understanding of the origin of the crown group. The Onychodontiformes, an enigmatic Devonian predatory fish group, seems to have characteristics of both stem and crown sarcopterygians but is difficult to place because of insufficient anatomical information. We describe the new skull material of Qingmenodus, a Pragian (similar to 409-million-year-old) onychodont from China, using high-resolution computed tomography to image internal structures of the braincase. In addition to its remarkable similarities with stem sarcopterygians in the ethmosphenoid portion, Qingmenodus exhibits coelacanth-like neurocranial features in the otic region. A phylogenetic analysis based on a revised data set unambiguously assigns onychodonts to crown sarcopterygians as stem coelacanths. Qingmenodus thus bridges the morphological gap between stem sarcopterygians and coelacanths and helps to illuminate the early evolution and diversification of crown sarcopterygians.

National Category
Evolutionary Biology
Identifiers
urn:nbn:se:uu:diva-301055 (URN)10.1126/sciadv.1600154 (DOI)000380073800023 ()27386576 (PubMedID)
Available from: 2016-08-17 Created: 2016-08-17 Last updated: 2016-08-17Bibliographically approved
Zhu, M., Ahlberg, P. E., Pan, Z., Zhu, Y., Qiao, T., Zhao, W., . . . Lu, J. (2016). A Silurian maxillate placoderm illuminates jaw evolution. Science, 354(6310), 334-336
Open this publication in new window or tab >>A Silurian maxillate placoderm illuminates jaw evolution
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2016 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 354, no 6310, p. 334-336Article in journal (Refereed) Published
Abstract [en]

The discovery of Entelognathus revealed the presence of maxilla, premaxilla, and dentary, supposedly diagnostic osteichthyan bones, in a Silurian placoderm. However, the relationship between these marginal jaw bones and the gnathal plates of conventional placoderms, thought to represent the inner dental arcade, remains uncertain. Here we report a second Silurian maxillate placoderm, which bridges the gnathal and maxillate conditions. We propose that the maxilla, premaxilla, and dentary are homologous to the gnathal plates of placoderms and that all belong to the same dental arcade. The gnathal-maxillate transformation occurred concurrently in upper and lower jaws, predating the addition of infradentary bones to the lower jaw.

National Category
Evolutionary Biology Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-310775 (URN)10.1126/science.aah3764 (DOI)000387777100046 ()27846567 (PubMedID)
Funder
Swedish Research Council, 2014-4102Knut and Alice Wallenberg Foundation
Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2017-11-29Bibliographically approved
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