A sclerite-bearing stem group entoproct from the early Cambrian and its implications

Zhifei Zhang*, Lars E. Holmer, Christian B. Skovsted, Glenn A. Brock, Graham E. Budd, Dongjing Fu, Xingliang Zhang, Degan Shu, Jian Han, Jianni Liu, Haizhou Wang, Aodhán Butler, Guoxiang Li

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    31 Citations (Scopus)

    Abstract

    The Lophotrochozoa includes disparate tentacle-bearing sessile protostome animals, which apparently appeared in the Cambrian explosion, but lack an uncontested fossil record. Here we describe abundant well preserved material of Cotyledion tylodes Luo et Hu, 1999, from the Cambrian (Series 2) Chengjiang deposits, reinterpreted here as a stem-group entoproct. The entoproct affinity is supported by the sessile body plan and interior soft anatomy. The body consists of an upper calyx and a lower elongate stalk with a distal holdfast. The soft anatomy includes a U-shaped gut with a mouth and aboral anus ringed by retractable marginal tentacles. Cotyledion differs from extant entoprocts in being larger, and having the calyx and the stalk covered by numerous loosely-spaced external sclerites. The description of entoprocts from the Chengjiang biota traces the ancestry of yet another lophotrochozoan phylum back to the Cambrian radiation, and has important implications for the earliest evolution of lophotrochozoans.

    Original languageEnglish
    Article number1066
    Pages (from-to)1-7
    Number of pages7
    JournalScientific Reports
    Volume3
    DOIs
    Publication statusPublished - 2013

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