Helcionelloida - Helcionellida - Helcionellidae
Full reference: J. B. Knight. 1947. Some new Cambrian bellerophont gastropods. Smithsonian Miscellaneous Collections 106(17):1-11
Parent taxon: Helcionellidae according to B. Runnegar and P.A. Jell 1976
See also Knight et al. 1960 and Sepkoski 2002
Sister taxa: Absidaticonus, Aegitellus, Anabarella, Anabaroconus, Anhuiconus, Anuliconus, Asiapatella, Asperconella, Auricullina, Bemella, Calyptroconus, Capitoconus, Chuiliella, Daedalia, Davidonia, Emarginoconus, Eocyrtolites, Fenqiaronia, Figurina, Guadalquivirospira, Hampilina, Hampilininae, Helcionella, Hispanoconus, Hujiagouella, Igorella, Ilsanella, Kuonamkaella, Lenoconus, Leptostega, Manasoconus, Marocella, Minastirithella, Miroconulus, Nyuella, Obtusoconus, Oelandia, Oelandiella, Papilloconus, Parapelagiella, Pararaconus, Paucella, Pedrocheotheca, Perssuakiella, Postacanthella, Prosinuites, Protowenella, Pseudopollicina, Randomia, Securiconus, Tannuella, Totoralia, Truncatoconus, Tuoraconus, Yangtzeconinae
Subtaxa: Cycloholcus nummus
Type: Cycloholcus nummus
Ecology: slow-moving low-level epifaunal detritivore
Distribution:
• Cambrian of United States (2: Indiana, Tennessee collections)
Total: 2 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.