Download (Helbling, 1799) (Bivalvia, Mactridae) occurring along Research

BASTERIA,
71:
93-95,
2007
Eastonia rugosa
(Helbling, 1799) (Bivalvia, Mactridae)
occurring along
Paola
ICRAM
(Central
Institute for
Marine
the Latium
La
coasts
Valle
Research),
Via di Casalotti, 300
-
00166 Rome,
Italy;
[email protected] (corresponding author)
Danilo Vani
ICRAM
(Central
Institute for Marine Research), Via di Casalotti, 300
-
00166
Rome, Italy;
[email protected]
Arnaldo Liboni
Via dell'Olmo, 40
-
00048 Nettuno
(Rome), Italy
& Carlo Smriglio
Via di Valle Aurelia, 134
The
the
authors
report
coast of Tor
specimens
Key
and
words:
the recovery
Caldara
single
of the Mactridae
(Rome)
valves
00167 Rome,
-
in the
were
Bivalvia, Mactridae,
Central
Italy; [email protected]
species
Eastonia
(Helbling, 1799) along
rugosa
Tyrrhenian Sea, Italy,
where
several
complete
collected.
Eastonia rugosa,
faunistics,
Central
Tyrrhenian
Italy.
sea,
INTRODUCTION
Eastonia rugosa
(Helbling, 1799) (Bivalvia,
Atlantic-Mediterranean
coasts
&
of NW. Africa, from
Cossignani,
(Gomez
Rodriguez
Mediterranean, this
(Bedulli
et
al., 1995),
the Balearic Islands
Cap
Bon-Tunis
Italy).
&
Senegal
eastern
Perez
species
in
SE.
are
of E. rugosa, both
to
Mactridae)
Guinea (Lucas, 1974;
Sanchez,
1997)
mainly
living
Data
about
general. Only
and
in
S.
as
its
the
fossils, along the
from
distribution
in
(Rome,
from
Italy)
the
Latium coasts,
(Albano,
Mariottini, 2006).
2006)
the
and
to
reappear there
along
Canary
Malaga
the
sandy
as
to
its
the
to
most
eastern
north
recently
the
near
the
occur-
(Rome,
during
seems to
Rome
limit
in
details on the
E. rugosa
near
In
Valencia and
Anzio and Nettuno
coasts
Islands
in the SE. part
the post Pliocene,
Pleistocene and in historical times. In the twentieth century,
the
Atlantic
Goto, 1991; Ardovini
to
published
coasts of
region
the
Mediterranean Sea.
Spain,
Meli (1897) has
He demonstrated its presence in the Roman
appeared
&
Morocco, Algeria and Tunisia, with
1971).
rather
and
Poppe
Portugal
in
common
in the Strait of Messina and
Sicily (Orlando, 1979),
in
relatively
is
distribution involves
geographical
Atlantic Ocean, from
occurs
(Pla, 2000),
(Zaouali,
Mediterranean Sea
rence
the
2004),
Its
province.
the
have dis-
Palo Laziale
(Smriglio
&
94
BASTERIA, Vol. 71,
Fig.
1.
Eastonia
rugosa
(Helbling, 1799),
Tor Caldara
beach, Rome, Italy.
Dimensions:
48.8x30.4
a, c, left
No.
2007
1-3,
valve.
valve; b, d, right
mm.
MATERIAL
During
in
Italy),
a
malacological
located inside the Natural
total of 30
dition of the valves, still linked
certainly
come
from
a
nearby
vernier calliper
a mean
in
height
length
of 34.7
and 30.6
Caldara,
lot of
fresh
at
single
is
low
were
known for
valves
ligament,
samples
Caldara,
were
its
near
43.8
mm
in
Anzio (Rome,
collected. This beach,
sulphurous
collected. The
sources.
perfect
complete specimens
show
A
con-
made us conclude that these bivalves
depth. Length (antero-posterior axis)
a mean
length of
were
and
measured with
49.2 mm
(± 3.7 s.d.); generally shell sizes vary from 40.4
mm
to
a
Tor
habitat
The
(fig. 1).
mm
by
a
of the shells of all
height (dorso-ventral axis)
digital
of
and
Tor
of Eastonia rugosa
specimens
Reserve
complete specimens
the beach of
along
excursion
November 2005, several
(±
4.8
mm to
s.d.)
a
and
59.3 mm
height.
DISCUSSION AND CONCLUSIONS
The data in this paper and in the literature (Albano, 2006;
indicate the presence of
especially
in
the
area
the south, and of
prefers
Poppe
sizes
an
soft bottoms
stable
a
between Palo Laziale
ideal habitat
(sand
or
& Goto, 1991), often
of
E.
rugosa observed
by Albano (2006)
and
population
mud)
even
in
Smriglio
at
low
(Rome)
depth.
between 6 and 30
study
are
& Mariottini
along
& Mariottini,
ecological
m
(Latina)
in
data show that E. rugosa
depth (Meli, 1987; Parenzan, 1976;
water
comparable
2006)
the Latium coasts,
in the north and Foce Verde
The
in presence of fresh
this
Smriglio
of Eastonia rugosa
to
flow (Orlando,
1979).
those
in Recent
times
the end of the
1800s.
reported
(2006) and by Meli (1897)
at
The shell
La Valle
al: Eastonia rugosa
et
The reappearance of Eastonia rugosa
the
in
that the
hypothesis
a
small
constant
of the
'greenhouse effect',
is
species
without
population
increase
the Latium
occurring along
in
now
of
phase
noticed for
being
Mediterranean
may have enabled
ed E. rugosa among the Atlantic
the Latium
along
a
Sea
the Straits of Gibraltar. Therefore it is
increasing
coasts
time.
long
a
could be
after
expansion,
having
that
recently
explained by
survived there
the slow and
Alternatively,
invaded
the so-called
by
recolonisation. Peres & Picard
(1964)
the Mediterranean
includSea
via
listed among the allochthonous Mediterranean
now
of which the
species (ICES, 2000; Occhipinti Ambrogi, 2002), species
the
95
surface temperature, caused
a true
species
coasts
dispersal
is
related
to
surface temperature.
sea
ACKNOWLEDGEMENTS
We thank Arnaldo Liboni's
and
specimens
for her
daughter, Claudia,
collaborator
a
generous
loan of Eastonia
rugosa
of "Forum Natura Mediterraneo" for his valu-
(Antonello)
able information.
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