Table 1. Geographic and stratigraphic distribution of Paleozoic eldonioids and their key morphological characteristics. Family


Genus and species Previous names Age Eldoniidae


Eldonia ludwigi Walcott, 1911a


middle Cambrian


middle Cambrian middle Cambrian


Eldonia eumorpha (Sun and Hou, 1987)


Eldonia berbera Alessandrello and Bracchi, 2003


Rotadiscidae


Rotadiscus grandis Sun and Hou, 1987


Rotadiscus sp.


Brzechowia sp. Dzik, 1991; Rotadiscus sp. Masiak and Zylińska, 1994


Pararotadiscus guizhouensis (Zhao and Zhu, 1994)


Emu Bay Shale taxon


Rotadiscidae?


Velumbrella czarnockii Stasińska, 1960


Seputus pomeroii MacGabhann and Murray, 2010


‘Paropsonemids’ Paropsonema cryptophya Clarke, 1900


Paropsonema mirabile (Chapman, 1926)


Discophyllum peltatum Hall, 1847


Discophyllum mirabile Chapman, 1926


Rotadiscus


guizhouensis Zhao and Zhu, 1994


early Cambrian


early - middle Cambrian


Ordovician Devonian


Stellostomites eumorphus Sun and Hou, 1987; Yunnanomedusa elegans Sun and Hou, 1987


middle Cambrian early Cambrian


Formation and locality


Burgess Shale Fmn, ?Duchesnay Fmn, British Columbia, Canada


Spence Shale, Utah, USA


Marjum Fmn, Utah, USA


Siligir Fmn, Siberia, Russia


Chiungchussu Fmn, Yunnan, China


No. of specimens Ornament >1,000 Simple radial


1 2


1


Simple radial Simple radial


Simple radial >2,000 Simple radial


Disc


rigidity Flexible


Flexible Flexible


Flexible Flexible


No. internal lobes


~30


? ?


~30 44


No.


bifurcations 1


? ?


1 1


Tentacle form


Dendritic, short & stubby


? ?


?


Dendritic, long & slender


Ordovician early Cambrian


early - middle Cambrian


middle Cambrian


Lower Ktaoua Fmn& First Bani Gp, Tafilalt, Morocco


Chiungchussu Fmn, Yunnan, China


Ociesęki & Słowiec Sandstone Fmns, Holy Cross Mountains, Poland


Kaili Fmn, Guizhou, China


Emu Bay Shale, Kangaroo Island, Australia


Ociesęki & Słowiec Sandstone Fmns, Holy Cross Mountains, Poland


Bardahessiagh Fmn, Co. Tyrone, Ireland


Grimes Siltstone Fmn, ?Nunda Sandstone Fmn, Genesee Gp, New York, USA


Silurian Ordovician


Dargile Fmn, Melbourne, Australia


Troy Frontal Zone, Troy, New York, USA


71 >50 5 Radial Flexible Fine concentric Rigid


Radial & fine concentric


>100 2 >100 4 >11


Radial & fine concentric


Rigid ~40–50 ~90 ? 1 1 ? ? Digitate ?


Diameter (mm) Main references ~120 (max) Walcott (1911a)


~40 ~80


38


Conway Morris and Robison (1988)


Conway Morris and Robison (1988); Conway Morris et al. (2015)


Friend et al. (2002)


~45–80 Chen et al. (1995); Zhu et al. (2002)


85–195


Alessandrello and Bracchi (2003)


~150 (ave) Zhu et al. (2002) 40–180


Stasińska, 1960; Masiak and Zylińska, 1994


Stiffened Fine concentric Stiffened Radial & concentric Radial & ?concentric Complex Flexible ~25–30 2 ? Stiffened up to 120 0 ? Stiffened ~40 ~30–35 ~28 1 2 ? Dendritic ? ?


15–105, most ~50–60


~21 19–86


Zhao and Zhu (1994); Zhu et al. (2002)


Paterson et al. (2016); herein


Stasińska (1960); Masiak and Zylińska (1994)


up to 70 MacGabhann and Murray (2010)


71–195 Clarke (1900)


5 2


Complex Complex


Flexible Flexible


~22–30 22–26


1 1


? ?


80x130; 75x105 (elliptical) 80–100


Chapman (1926); Conway Morris (1993a)


Hall (1847); MacGabhann and Murray (2010)


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