Brachyuran crabs (Crustacea, Decapoda) from the remote oceanic Archipelago Trindade and Martin Vaz, South Atlantic Ocean
Author
In, First Published
text
Zootaxa
2022
2022-06-02
5146
1
129
journal article
10.11646/zootaxa.5146.1.1
11755334
7626155
52C3E5E3-80B6-49DB-BC9C-194560D491F7
Achelous tumidulus
Stimpson, 1871a
(
Fig. 27B, E
)
Acheloüs tumidulus
Stimpson, 1871a: 149
[
Type
locality:
West
of
Tortugas
and off
Conch Reef
,
Florida
].
Trindade and Martin Vaz specimens.
1 juvenile
(
MZUSP 40252
),
Brazil
, off
Espírito Santo
,
Trindade Island
,
Praia da Calheta
,
20°30’29.5”S
,
29°18’37.0”W
,
D. Abatte
et al.
coll.,
23.vii.2011
.
1 juvenile
(
MZUSP 40182
),
ibidem
,
20°30’24.04”S
,
29°20’47.86”W
,
Thiony-Lucas
coll.,
30.i.2012
, rocks,
32 m
. 1 ovigerous female (
MZUSP 41419
),
Trindade Island
, R/V “Marion Dufresne”,
TAAF
MD55/
Brésil Expedition
, stn 36 DC61,
20°29.2’S
,
29°18.2’W
,
22.v.1987
,
63 m
. 1 juvenile female (
MZUSP 40177
),
Martin Vaz Archipelago
,
20º30’45.7’’S
,
29º18’21.9’’W
,
J.B. Mendonça
coll.,
23.vii.2013
,
13 m
.
Size of largest female: cl
10.5 mm
, cw
16 mm
.
Comparative material examined.
Achelous tumidulus
: United States: Florida:
1 male
,
1 female
(
MZUSP 9402
),
Cape Canaveral, R
/V “Combat”, stn 119,
29º52’N
,
80º11’W
,
16.ix.
1956
, 360 m [
F.A. Chace
det., don., 1957].
Brazil: Espírito Santo: 1 ovigerous female (
MZUSP 21201
),
Vitória
–
Trindade Seamount Chain, R
/V “Marion Dufresne”,
TAAF
MD55/
Brésil Expedition
,
Dogaressa Bank
, stn 24 DC42,
20º54.67’S
,
34º01.35’W
,
17.v.1987
,
60 m
.
1 juvenile (
MZUSP 41466
),
ibidem
,
Columbia Bank
, stn 27 DC47,
20º41’S
,
32º12.85’W
,
19.v.1987
,
94–105 m
.
São Paulo
:
1 male
(
MZUSP 8082
)
, Ubatuba, R/V “Veliger II”, Projeto Integrado, stn 23,
23º47’S
,
45º13’W
,
19.iv.1986
,
36 m
.
Distribution.
Bermuda
, South Florida, Gulf of Mexico, Antilles, Caribbean,
Guyana
and
Brazil
(Par to
Bahia
,
Espírito Santo
,
São Paulo
, Santa Catarina) (
Rodriguez 1980
;
Melo 1996
;
Felder
et al
2009
). This is the first record of
A. tumidulus
from the Vitória–Trindade Seamount Chain (Dogaressa and Columbia banks) and the Trindade and Martin Vaz Archipelago.
Ecological notes.
Achelous tumidulus
inhabits sand, coral and rocky bottoms (
Melo 1996
) and vegetated habitats dominated by
Thalassia testudinum
mixed with
Syringodium filiforme
,
Halimeda opuntia
,
H. incrassata
,
Penicillus capitatus
and
Udotea flabellum
(
Rathbun 1930
;
Park 1969
;
Heck & Weinstein 1989
), between
1 m
and
75 m
.
It is preyed by a number of juvenile fish species (
Heck & Weinstein 1989
) and also by the cobia fish
Rachycentron canadus
(Linnaeus)
(
Hamilton
et al.
2019
).
Remarks.
Achelous tumidulus
(
Fig. 27B, E
), originally described in
Achelous
, was later combined to
Cronius
Stimpson, 1860
by
Rathbun (1920)
. Afterwards,
Rathbun (1930)
formally synonymized
Cronius bispinosus
Miers, 1886
(
type
locality:
Bahia
,
Brazil
) with
Achelous tumidulus
Stimpson, 1871a
, while keeping the Stimpson’s species in
Cronius
. More recently,
Mantelatto
et al.
(2009)
returned
C. tumidulus
to
Achelous
.