A microscopic Burgess Shale: small carbonaceous fossils from a deeper water biota and the distribution of Cambrian non-mineralized faunas
Proceedings of the Royal Society B Biological Sciences,
Journal Year:
2025,
Volume and Issue:
292(2041)
Published: Feb. 1, 2025
(SCFs)
have
disclosed
a
record
of
organically
preserved
faunas
from
Cambrian
epeiric
seas.
Their
phylogenetically
and
functionally
derived
components,
including
probable
crown-group
crustaceans
molluscs,
are
absent
the
‘exceptional’
palaeoenvironmental
settings
captured
by
Burgess
Shale-type
(BST)
macrofossil
biotas.
This
apparent
segregation
SCF
BST-macrofossil
deposits
has
led
to
contrasting
hypotheses
on
whether
their
faunal
differences
reflect
genuine
ecological
patterns
or
overriding
taphonomic
controls.
We
report
new,
exceptionally
diverse
biota
Hess
River
Formation
Northwest
Territories
(Canada),
which
occupied
an
offshore
slope
setting.
The
biota,
hosted
single
shale
sample,
rivals
Shale
in
its
disparity
bilaterian
body
plans,
providing
microfossil
counterpoint
regional
similar
deeper-water
palaeoenvironments.
SCFs
comprise
ecdysozoan
spiralian
sclerites,
arthropod
mouthparts,
semi-articulated
wiwaxiids,
problematica
pterobranchs,
but
no
recognizable
crown
molluscs
crustaceans.
similarities
between
fauna
classic
biotas
suggest
significant
palaeoecological
overlap,
robust
distinct
expressions.
upholds
existence
comparatively
modern
communities
settings,
populating
both
assemblages
sampling
Language: Английский
A sea of worms: the striking cases of the European Perinereis cultrifera and P. rullieri (Annelida: Nereididae) species complexes, with description of 13 new species
Invertebrate Systematics,
Journal Year:
2025,
Volume and Issue:
39(2)
Published: Feb. 20, 2025
Molecular
data
have
been
suggesting
the
existence
of
a
complex
cryptic
species
within
taxon
Perinereis
cultrifera
,
which
has
not
fully
explored
yet.
In
this
study,
we
performed
morphological
and
molecular
analysis
(mtCOI-5P
16S
rRNA
28SD2
)
specimens
from
intertidal
marine
brackish
European
localities,
mostly
focusing
on
Mediterranean
Sea
Canary
Islands.
Two
major
phylogenetic
clades
with
at
least
18
divergent
(COI
19.8;
6.4-28.5%)
completely
sorted
lineages
were
uncovered
based
original
data,
13
occurred
exclusively
in
Sea,
further
5
are
unique
to
Italian
waters.
An
additional
morphologically
similar
lineage,
corresponding
P.
oliveirae
coexisting
single
NE
Atlantic
lineage
complex,
was
also
retrieved
as
an
ingroup.
Careful
inspection,
combined
deep
divergence
between
two
perfect
match
each
clade
specific
paragnath
chaetal
types,
highlighted
distinct
groups
species:
Clade
A,
shows
features
matching
historical
descriptions
B
overlooked
morphotype
described
rullieri
.
Although
paragnaths
show
pattern
clades,
their
sizes
considerably
smaller
chaetae
characterised
by
coarse
serration
base
spiniger
blades
long
falciger
blades,
opposed
lightly
serrated
short
falcigers
Further
mainly
thickness,
direction
length
paragnaths,
well
expansion
posteriormost
dorsal
ligules
revealed
clade,
together
geographic
environmental
boundaries
allowed
for
differentiation
most
these
without
data.
Thirteen
new
here
formally
described,
eight
belonging
A:
caesarea
sp.
nov.,
faulwetterae
houbinae
maleniae
miquellai
muscoi
nieri
nov.
twobae
nov.;
five
B:
castellii
juno
jupiter
minerva
tibicena
The
combination
beaucoudrayi
is
proposed
Nereis
previously
considered
synonymous
only
occurring
Atlantic.
Lastly,
s.s.,
s.s
ingroup
redescribed
using
topotypical
material,
available
syntypes
lectotypes
assigned
former
two.
ZooBank:
urn:lsid:zoobank.org:pub:28C64123-DE82-411D-BC96-5E892FC692E3.
Language: Английский
Molecular systematics of Perinereis and an investigation of the status and relationships of the cultured species Perinereis wilsoni Glasby & Hsieh, 2006 (Annelida, Nereididae)
Zoosystematics and Evolution,
Journal Year:
2024,
Volume and Issue:
100(4), P. 1297 - 1314
Published: Sept. 13, 2024
In
this
study,
we
conducted
morphological
and
molecular
analyses
of
Perinereis
wilsoni
,
a
species
being
considered
for
aquaculture
in
China.
We
found
difficult
to
identify
because
its
close
similarity
the
sympatric
P.
mictodonta
thus
sought
genetic
markers
more
easily
distinguish
it
investigate
phylogenetic
relationship
other
nereidids.
For
first
time,
sequenced,
assembled,
annotated
complete
mitochondrial
genome,
nuclear
ribosomal
sequences
(
18S-ITS1-5.8S-ITS2-28S
),
four
histone
genes
H3-H2A-H2B-H4
)
.
Comprehensive
bioinformatics
methods
were
employed
assemble
genome-skimming
data
ensure
assembly
quality.
Phylogenetic
based
on
five
datasets
available
genomes
(32
taxa
Nereididae,
including
8
using
maximum
likelihood
Bayesian
analyses,
provide
support
monophyly
genus
contrast,
nuntia
group,
subgroup
within
is
nonmonophyletic.
has
closer
with
vancaurica
Our
study
serves
as
baseline
future
work
cultivation,
reproductive
biology,
phylogeny
Language: Английский