Morphology and phylogenetic origin of the spinicaudatan Neodiestheria from the Lower Cretaceous Dalazi Formation, Yanji Basin, north-eastern China

Gang Li, Tohru Ohta, David J. Batten, Takashi Sakai, Takeshi Kozai

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    The spinicaudatan Neodiestheria Chen is an important component of the diverse Early Cretaceous Yanjiestheria fauna in eastern Asia. Examination under a scanning electron microscope of newly collected and well-preserved specimens of Neodiestheria dalaziensis Chen from the Albian Dalazi Formation of Zhixin, Jilin Province, north-eastern China, has revealed morphological features of the carapace not recognized previously, namely that puncta are not only evenly distributed on growth bands near the umbo and gradually merge into a punctate fine reticulation and dense radial lirae on each growth band in the upper-middle part of the carapace, but also occur on growth lines and within the lumina of a fine reticulum, and between radial lirae on growth bands in the middle and lower parts of the carapace. Growth bands in anteroventral, ventral and posteroventral parts of the carapace are also ornamented with transversely elongate large pits (depressions) surrounded by swellings, appearing as a large reticulum superimposed over fine reticulation and radial lirae. These ontogenetically developing morphological patterns on the growth bands of the juvenile stage of the carapace indicate that Neodiestheria is closely related phylogenetically to Triglypta Wang.

    元の言語English
    ページ(範囲)183-193
    ページ数11
    ジャーナルCretaceous Research
    62
    DOI
    出版物ステータスPublished - 2016 7 1

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    ASJC Scopus subject areas

    • Palaeontology

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