On the enigma of Palaenigma wrangeli (Schmidt), a conulariid with a partly non-mineralized skeletonKröger, Björn; Vinn, Olev; Toom, Ursula; Corfe, Ian J.; Kuva, Jukka; Zaton, MichalPeerJ2021 / Art. e12374 https://doi.org/10.7717/peerj.12374 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS