Table 1. (Continued ) Genus


Genus Nesonektris García-Bellido et al., 2014


Genus Yuyuanozoon Chen, Feng, and Zhu in Chen et al., 2003


Heteromorphida Shu, 2005


Class


Order Banffiata Aldridge et al., 2007


Family Banffidae Caron, 2006


Genus Banffia Walcott, 1911


Species


Nesonektris aldridgei García-Bellido et al., 2014


Yuyuanozoon magnificissimi Chen, Feng, and Zhu in Chen et al., 2003


Banffia constricta Walcott, 1911


Occurrence Anterior opening Anterior section


Emu Bay Shale Anterior edge vertical Subquadrate in lateral view, lateral groove narrow


Chengjiang


Circumventing feature narrow


Burgess Shale


Crown-like structure around the antero- ventral anterior opening is composed of three circlets. Frontal antenniform (?) outgrowth


Banffia episoma Conway Morris and Selden, 2015


Genus Heteromorphus Luo and Hu in Luo et al., 1999


Heteromorphus confusus Chen and Zhou, 1997


(= Banffia confusa Chen and Zhou 1997; Heteromorphus longicaudatus Luo and Hu in Luo et al., 1999)


Genus Skeemella Briggs et al., 2005


Skeemella clavula Briggs et al., 2005


Pierson Cove Formation


Described as ‘Head shield-like,’ that is divided


longitudinally and with a straight dorsal margin


Lateral groove developed, nine segments; anterior section resembles a ‘head shield’


No pouches preserved Narrow vermiform, 43 segments; posterior section terminates in an arthropod-like unsegmented ‘tail- piece’–like structure


Terminal with two spines


Possible vetulicolian Spence Shale Circular


Elongate ovoid in lateral view, lacking lateral groove


Not segmented, lacking lateral groove


Lateral pouches Posterior section


No pouches preserved Internal rod-like structure extends along axis of posterior section


Five pouches; cowl-like


Seven segments, annulations within each segment


No pouches preserved Flexible posterior section composed of 40 to 50 lightly sclerotized and faintly defined segments


Shorter, narrower than posterior


Chengjiang


Anterior edge nearly vertical


Lateral groove developed


No pouches preserved Variable in shape Anus Terminal Terminal Additional comments


Most complete specimen is 125mm


Up to 200mm


Terminal


Simple and narrow alimentary canal; quadrate jointing between anterior and posterior section may reflect twisting


Terminal


Constriction with cross- over such that dorsal and ventral sides of posterior and anterior are transposed


Five pouches; weakly preserved


Terminal segment semicircular


Terminal


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