The Posongchong Formation is an early Devonian formation from China. It preserves a wide range of plant and fish fossils, many being only known from this formation.[1]
Paleobiota
Plants
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Color key
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Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
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Plants
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Genus
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Species
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Higher taxon
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Notes
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Images
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Adoketophyton
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A. subverticillatum, A. parvulum,[1] A. pingyipuensis[2]
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Lycophyta?
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Formerly placed within Zosterophyllum
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Amplectosporangium
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A. jiangyouense, A. unilaterale, A. unilaterale forma minor[2]
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incertae sedis
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A. unilaterale was formerly placed within Oricilla[1]
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Baragwanathia
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B. sp.
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Drepanophycales
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Only known from leafy stems, cannot be placed in a species[1]
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Catenalis
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C. digitata[1]
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Tracheophyta incertae sedis
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Intermediate between algae and vascular plants[3]
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Celatheca[4]
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C. beckii
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Lyginopteridales?
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One of the earliest known seed plants[1]
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Cervicornus[5]
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C. wenshanensis
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Sphenopsida?[1]
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Sporangia unknown, may be synonymous with Estinnophyton
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Demersatheca
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D. contigua
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Zosterophylls[6]
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Only known from fertile axes[1]
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Dibracophyton[7]
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D. acrovatum
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Barinophytopsida incertae sedis[1]
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Relatively unusual with dichotomous branching “leaves”
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Discalis
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D. longistipa
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Zosterophyllales[8]
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Bears spines on its main axes, somewhat resembles Sawdonia[1]
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Distichophytum
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D. sp.
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Zosterophyllales
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Only known from a fragmentary specimen[1]
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Estinnophyton[9]
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E. yunnanense
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Sphenopsida?
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Possibly a stem-sphenopsid[1]
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Eophyllophyton[10]
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E. bellum
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Eophyllophytopsida (Euphyllophytes)[1]
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Oldest plant with megaphyllous leaves
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Guangnania
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G. cuneata
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Zosterophyllopsida?[11]
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Unclear whether it truly is a zosterophyll, somewhat similar to Yunia[1]
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Gumuia[12]
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G. zyzzata
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Zosterophyllales
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One of the most well-known Posongchong plants[1]
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Halleophyton[13]
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H. zhichangense
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Drepanophycales
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Another possible species also known from the formation[1]
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Hedeia[14]
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H. sinica
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Progymnospermopsida?
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Resembles both seed plants and trimerophytes[1]
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Hicklingia
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cf. Hicklingia sp.
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Zosterophyllales
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Resembles the type species of the genus, but bears a few differences from it[1]
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Hueberia
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H. zhichangensis[15]
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Drepanophycales?[16]
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Also resembles Leclercqia, however lack of anatomy means its position is unclear.[1]
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Huia[17]
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H. recurvata
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Rhyniopsida?
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Likely related to Renalia[1]
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Ornicephalum[2]
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O. sichuanense
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Zosterophyllopsida
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Formerly classed within Zosterophyllum
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Pauthecophyton
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P. gracile
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Trimerophyta[18]
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Related to Psilophyton[1]
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Polythecophyton
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P. demissum
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Progymnospermopsida?
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Likely related to Hedeia and Aneurophytales[1][19]
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Psilophyton
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P. primitivum[14]
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Trimerophyta
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One of the most widespread basal vascular plants[1]
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Ramoferis
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R. amalia
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Zosterophyllales
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Closely resembles Zosterophyllum[20][1]
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Riccardiothallus
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R. devonicus
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Aneuraceae
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Earliest simple thalloid liverwort known[21]
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Stachyophyton[22]
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S. yunnanense
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Tracheophyta incertae sedis
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Divergent from other plants due to its leaf-like branches and other features[1]
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Wenshania
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W. zhichangensis
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Zosterophyllales
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Closely resembles Zosterophyllum[23][1]
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Yunia[24]
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Y. dichotoma, Y. guangnania[1]
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Zosterophyllopsida?
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Possibly closer to euphyllophytes than zosterophylls?
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Zhenglia
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Z. radiata
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Protolepidodendrales?[25]
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May preserve the earliest lycophyte ligulae[1]
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Zosterophyllum
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Z. australianum, Z. ramosum, Z. minifertillum, Z. tenerum[1]
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Zosterophyllales
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Known from numerous other localities
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Animals
Animals
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Genus
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Species
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Higher taxon
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Notes
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Images
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Arquatichthys
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A. porosus
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Dipnomorpha
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Only known from scales and skull material[26]
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Brevipetalichthys
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B. gracilis
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Petalichthyida
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Euporosteus
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E. yunnanensis
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Actinistia
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Earliest known anatomically modern coelacanth[27]
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Gantarostrataspis[28]
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G. gengi
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Gantarostrataspidae (Galeaspida)
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Bears an unusual sensory system
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Gumuaspis[28]
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G. rostrata
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Huananaspidae
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Resembles Laxaspis
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Huananaspis[29]
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H. wudinensis
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Huananaspidae
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Also known from the Nagaoling Formation[30]
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Lungmenshanaspis
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L. yunnanensis
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Huananaspidae (Galeaspida)
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From a different locality to the “main” Posongchong Formation, yet correlates with it in age[31]
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Macrothyraspis
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M. longicornis, M. longilanceus
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Macrothyraspidae (Galeaspida)
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Bears unusually long cornual and rostral processes[32]
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Osteolepiformes indet.
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Unapplicable
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Osteolepiformes
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Cannot be placed within a genus[31]
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Qingmenaspis[33]
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Q. microculus
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Galeaspida incertae sedis
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Bears similar unornamented regions to osteostracan “lateral fields”
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Qingmenodus
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Q. yui
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Onychodontidae
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The first onychodont to preserve the otoccipital region of the skull[34]
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Rhegmaspis
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R. xiphoidea
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Gantarostrataspidae (Galeaspida)
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Likely quite active as shown by its streamlined head shield[35]
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Sanqiaspis
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S. rostrata, S. zhaotongensis
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Sanqiaspididae (Galeaspida)
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Species also known from Vietnam[36]
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Tungsenia
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T. paradoxa
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Tetrapodomorpha
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Most basal and earliest known tetrapodomorph[37]
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Wenshanaspis
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W. zhichangensis[38]
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Zhaotongaspididae (Galeaspida)[39]
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Differentiated by its cornual processes
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Yiminaspis
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Y. shenme
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Wuttagoonaspidae
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Suggests a Chinese origin of the family[40]
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Zhaotongaspis
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Z. janvieri
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Zhaotongaspididae (Galeaspida)
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Bears the highest quantity of branchial fossae known in agnathans[41]
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References
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- ^ a b c Edwards, Dianne; Li, Cheng-Sen (November 2018). "Diversity in affinities of plants with lateral sporangia from the Lower Devonian of Sichuan Province, China". Review of Palaeobotany and Palynology. 258: 98–111. Bibcode:2018RPaPa.258...98E. doi:10.1016/j.revpalbo.2018.07.002.
- ^ Shougang, Hao; Beck, Charles B. (1 April 1991). "Catenalis digitata , gen. et sp.nov., a plant from the Lower Devonian (Siegenian) of Yunnan, China". Canadian Journal of Botany. 69 (4): 873–882. Bibcode:1991CaJB...69..873S. doi:10.1139/b91-113.
- ^ Hao, Shougang; Gensel, Patricia G. (1995). "A New Genus and Species, Celatheca beckii, from the Siegenian (Early Devonian) of Southeastern Yunnan, China" (PDF). International Journal of Plant Sciences. 156 (6): 896–909. Bibcode:1995IJPlS.156..896H. doi:10.1086/297312. JSTOR 2475120.
- ^ Li, Cheng-Sen; Hueber, Francis M. (April 2000). "Cervicornus wenshanensis, gen. et sp. nov, a Pragian (Early Devonian) plant with forked leaves from Yunnan, China". Review of Palaeobotany and Palynology. 109 (2): 113–119. Bibcode:2000RPaPa.109..113L. doi:10.1016/S0034-6667(99)00046-9. PMID 10767437.
- ^ Wang, Yao; Xu, Hong-He; Wang, Yi (June 2020). "Morphology, nomenclature and potential paleophytogeographic implication of Demersatheca contigua (Zosterophyllopsida) from the Lower Devonian of Yunnan and Guangxi, southwestern China". Review of Palaeobotany and Palynology. 277: 104209. Bibcode:2020RPaPa.27704209W. doi:10.1016/j.revpalbo.2020.104209.
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