Helicocystis
Extinct genus of marine invertebrates
Summary
Helicocystis is an extinct genus of early echinoderm known from the Jbel Wawrmast Formation of Morocco, dating to the Cambrian Stage 5. It represents a significant transitional fossil in the evolutionary history of echinoderms, as it possesses a pentaradial (five-fold) body plan while maintaining characteristics of more primitive, spiral-shaped ancestors.
Originally created by Smith609
6/18/2019, 2:27:29 PM
Modified
5/21/2026, 2:32:02 PM
Recent revisions
[[User:Yixpoleg|Yixpoleg]] Smith & Zamora (2013) does NOT say 507, it lists 515–510 Ma. Circa "Cambrian stage 4–5 boundary and the base of stage 5"
Undid revision [[Special:Diff/1355380465|1355380465]] by [[Special:Contributions/Kevmin|Kevmin]] ([[User talk:Kevmin|talk]]) Unexplained revert. There is a citation.
Undid revision [[Special:Diff/1355272860|1355272860]] by [[Special:Contributions/Yixpoleg|Yixpoleg]] ([[User talk:Yixpoleg|talk]]) Citation?
ce
Consolidate references
Improve phrasing- the source (mindat) indicates that the feeding mode came from the generic data on echinoderms.
Fix some errors after consulting the cited paper- there is no mention of "Jbel Tramo" nor of Algeria in the paper.
The main box should only have the relevant organism (but keep the comparision graphic in the description section)
added more to the descriptiotion
Did a lot of work added description and ecology
removed [[Category:Helicoplacoidea]]; added [[Category:Prehistoric echinoderms]] using [[WP:HC|HotCat]]
/* top */ [[User:Monkbot/task 21: Replace page(s) with article-number|Monkbot/task 21: Replace page(s) with article-number]];
−[[Category:Monotypic prehistoric bilaterian genera]]; ±[[Category:Prehistoric echinoderm genera]]→[[Category:Monotypic prehistoric echinoderm genera]] using [[WP:HC|HotCat]]
added [[Category:Monotypic prehistoric bilaterian genera]] using [[WP:HC|HotCat]]
add link
