Sclerites and possible mouthparts of Wiwaxia from the temperate palaeolatitudes of Colombia, South America

Abstract

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A cryptic record of Burgess Shale‐type diversity from the early Cambrian of Baltica

“…); 14, Georgina Basin, Australia (Southgate & Shergold ; Porter ); 15, Llanos Basin, Colombia (Smith et al . ); 16, Sirius Passet, Greenland, two species (Parry et al . ); 17, Guanshanchaeta felicia , Guanshan biota, China (Liu et al .…”

“…Other named species of Wiwaxia have been established on the basis of distinctive rib thickness, sclerite outline, root morphology and/or surface ornament (Smith et al . ). Given their conspicuously chaeta‐like habit and microvillar microstructure, all wiwaxiid sclerites can be confidently placed in total‐group Lophotrochozoa, despite on‐going debate regarding their phylum‐level status (Butterfield , ; Smith ; Zhang et al .…”

“…A) are comparable to ‘possible wiwaxiid mouthparts’ identified in a Cambrian SCF assemblage from Columbia (see Smith et al . , fig. 3), it is notable that these do not occur in the same samples yielding Wiwaxia sclerites here.…”

“…, b; but see Smith et al . ). Here we expand this record to the palaeogeographically isolated palaeocontinent of Baltica.…”

New reconstruction of the Wiwaxia scleritome, with data from Chengjiang juveniles

“…Wiwaxia juveniles occur in almost all geographic and ecological settings 31 32 , perhaps reflecting planktonic larval dispersal 33 . The rarity of adult specimens in shallow waters may therefore represent failure to reach maturity in these environments – whether through active migration to deeper water, or through accentuated predation pressure on adult organisms.…”