- crown-group gastropods.
Previous to the 2006
classification by Parkhaev,
helcionellids were
classified within the
separate class Helcionelloida or as "Uncertain...
-
concept that the
ancestral molluscan radula was mineralized. However, the
helcionellids,
which first appear over 540 million
years ago in
Early Cambrian rocks...
-
convincingly triploblastic, as all "higher"
animals are. Subsequently, the
Helcionellids are the
first s****y
fossils that can be
placed in the stem
group to...
-
Marrella Radiodonts Halwaxiids Opabinia Odontogriphus Small s****y
fauna Helcionellids Evolutionary concepts Trends Cambrian substrate revolution Themes Cladistics...
-
Marrella Radiodonts Halwaxiids Opabinia Odontogriphus Small s****y
fauna Helcionellids Evolutionary concepts Trends Cambrian substrate revolution Themes Cladistics...
-
Marrella Radiodonts Halwaxiids Opabinia Odontogriphus Small s****y
fauna Helcionellids Evolutionary concepts Trends Cambrian substrate revolution Themes Cladistics...
-
proposes the
cephalopods and
gastropods as
sister to the
scaphopods with
helcionellids as the stem group. A
review of deep
molluscan phylogeny in 2014 found...
-
Oelandia is an
extinct genus of
basal molluscs of the
family helcionellid from the
Middle Cambrian of Sweden,
China and
North America. It has a small,...
-
concept that the
ancestral molluscan radula was mineralized. However, the
Helcionellids,
which first appear over 540 million
years ago in
Early Cambrian rocks...
- this
genus belongs with the gastropods, the monoplacophorans, or the
helcionellids,
although no firm ****ociation with any of
these classes has been established...
