Athenacrinus n. gen. and other early echinoderm taxa inform crinoid origin and arm evolution
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Paleontology"
DOI: 10.1017/jpa.2019.87
Abstract: Abstract. Intermediate morphologies of a new fossil crinoid shed light on the pathway by which crinoids acquired their distinctive arms. Apomorphies originating deep in echinoderm history among early nonblastozoan pentaradiate echinoderms distinguish Tremadocian (earliest Ordovician)… read more here.
Keywords: arm; athenacrinus gen; gen early; athenacrinus ... See more keywords
New camerate crinoid genera from the Upper Ordovician (Katian) of Estonia: evolutionary origin of family Opsiocrinidae and a phylogenetic assessment of Ordovician Monobathrida
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Systematic Palaeontology"
DOI: 10.1080/14772019.2018.1447519
Abstract: Most major crinoid clades first appear in the fossil record during the Ordovician, but the evolutionary origins of many higher taxa remain unresolved. Here, the first camerate crinoids from the Katian (Upper Ordovician) of Estonia… read more here.
Keywords: estonia; upper ordovician; family; camerate ... See more keywords