21 genera are assigned to the class HELCIONELLOIDA

Order	Genus	FOP	FOS	LOP	LOS
uncertain	Anabarella	V	N-Da-u	Cm	uMid-u
uncertain	Asperconella	Cm	Boto-u	Cm	Boto-u
uncertain	Bemella	V	N-Da-u	Cm	mMid-l
uncertain	Calloconus	D	Sieg	D	Emsi
uncertain	Coreospira	Cm	Tojo	Cm	Tojo
uncertain	Dianella	Cm	Tomm	Cm	Tomm
uncertain	Eotebenna	Cm	Boto-l	Cm	uMid-l
uncertain	Eurekapegma	Cm	uMid-u	Cm	uMid-u
uncertain	Helcionella	V	N-Da-u	Cm	Dres-l
uncertain	Latouchella	V	N-Da-u	Cm	uMid-u
uncertain	Leptostega	Cm	Atda-u	Cm	mMid-l
uncertain	Mellopegma	Cm	Tomm-l	Cm	uMid-m
uncertain	Nyuella	O	l	O	l
uncertain	Oelandia	Cm	m	Cm	m
uncertain	Perssuakiella	Cm	uMid-u	Cm	uMid-u
uncertain	Protowenella	Cm	Atda-u	Cm	uMid-u
uncertain	Scenella	Cm	Tomm-u	Cm	Dres
uncertain	Securiconus	V	N-Da-u	Cm	m
uncertain	Stenotheca	Cm	Atda	Cm	uMid-l
uncertain	Tannuella	Cm	Tomm-l	Cm	uMid-l
uncertain	Yochelcionella	Cm	Tomm-l	Cm	uMid-l

Search Again
FOP = Period of first occurrence
FOS = Stage of first occurrence
LOP = Period of last occurrence
LOS = Stage of last occurrence

Stage abbreviations follow Sepkoski (2002).