A new cleaner goby of the genus Elacatinus (Teleostei: Gobiidae), from Trindade Island, off BrazilAuthorGuimarães, Ricardo Z. P.AuthorGasparini, João LuizAuthorRocha, Luiz A.textZootaxa200477018journal article10.5281/zenodo.158021feb890f9-f3ec-485b-81e6-49837523d1cc1175532615802166E56D98-831B-4F41-A163-7AE1A9B4639BElacatinus pridisisp. n.
Trindade cleaner goby (
Figs. 1–3
)
Type
series
:
Holotype
:
MNRJ
21980,
23.6 mm
SL, Enseada dos Portugueses, Trindade Island (
20°30'S
,
29°20'W
), at a depth of
5 m
, collected by J. L. Gasparini,
1 April 1999
.
Paratypes
:
LBRP
5618 (2 ind., 20.2,
27.8 mm
SL, larger a female, smaller undetermined), Enseada dos Portugueses, Trindade Island (
20°30'S
,
29°20'W
), at a depth of
5 m
, collected by R. Z. P. Guimarães,
10 October 1998
;
MBML
593 (2 ind., 20.3,
24.5 mm
SL, larger a female, smaller undetermined),
MNRJ
21981 (2 ind., 20.2,
20.5 mm
SL, undetermined),
USNM
365990 (1 ind., 21.0 mm SL, undetermined), collected with the
holotype
;
UFES
1424 (1 ind.,
28.4 mm
SL, undetermined),
ZUEC
5412 (1 ind.,
18.1 mm
SL, undetermined), Enseada dos Portugueses, Trindade Island (
20°30'S
,
29°20'W
), at a depth of
6 m
, collected by J. L. Gasparini,
8th April 2001
.
FIGURE 1
: Lateral view of
Elacatinus pridisin. sp.
, holotype (MNRJ 21980), 23.6 mm SL (Photograph by J. L. Gasparini).
FIGURE 2
: Detail of anterior portion of body of
Elacatinus pridisin. sp.
, paratype (UFES 1424), 28.4 mm SL, photographed in an aquarium immediately after collection (Photograph by J. L. Gasparini).
Additional material
:
LBRP
5618 (1 ind.,
27.7 mm
SL, c & s), Enseada dos Portugueses, Trindade Island (
20°30'S
,
29°20'W
), at a depth of
5 m
, collected by R. Z. P. Guimarães,
10th October 1998
.
FIGURE 3
: Brazilian species of
Elacatinus
: Top
:
Elacatinus pridisin. sp.
, holotype (MNRJ 21980), 23.6 mm SL (Photograph by J. L. Gasparini); middle:
Elacatinus figaro
, (LBRP 0728), 27.8 mm SL, from the Brazilian coast (Photograph by R. Z. P. Guimarães); bottom:
Elacatinus randalli
,
(MNRJ 12054), 28.7 mm SL, from Fernando de Noronha Archipelago, photograph kindly provided by Dr. Gustavo Nunan. All specimens live, photographed in aquaria shortly after collection.
Comparative material
:
Elacatinus randalli
:
ANSP110672
(1 ind.,
21.1 mm
SL,
holotype
),
ANSP110673
(5 ind., 19.0–
27.5 mm
SL,
paratypes
),
St. Vincent
Islands;
ANSP110679
(1 ind.,
27.3 mm
SL,
paratype
),
ANSP110680
(3 ind.,
10.5–31.5 mm
SL,
paratypes
),
Venezuela
;
MNRJ
12054 (2 ind.,
19.8–23.4 mm
SL
122.9 mm
SL, c & s), Fernando de Noronha Archipelago.
Elacatinus figaro
:
LBRP
0 494 (3 ind.,
21–37.7 mm
SL),
LBRP
0 728 (7 ind.,
24–30.75 mm
SL, 2 ind.,
24.2–27.5 mm
SL c & s),
LBRP
3084 (1 ind.
36.7 mm
SL),
LBRP
3494 (20 ind.26.1–30.0 mm SL),
LBRP
3515 (12 ind.,
24.7– 30.8 mm
SL, 3 ind.,
26–28.2 mm
SL, c & s), state of Rio de Janeiro,
Brazil
.
Diagnosis
:
Elacatinus pridisin. sp.
differs from its congeners of the
Horsti
Complex (
sensuBöhlke & Robins 1968
) that have a pale stripe extending from the eye to the caudalfin base by the following combination of characters: dark longitudinal stripe wide, reaching lower abdomen and base of anal fin (
vs
. never reaching abdomen or base of anal fin in all other species); pectoralfin rays typically 18 (
vs
. typically
17 inE. randalli
and
E. figaro
and typically
16 inE. atronasum
(Böhlke & Robins))
; analfin rays typically 11 (
vs
.
typically
10 inE. figaro
); oval spot present on snout (
vs
. no spot in
E. atronasum
and
E. horsti
(Böhlke & Robins)
, a "V"shaped spot in
E. prochilos
(Böhlke & Robins)
, and a medial bar in
E. xanthiprora
(Böhlke & Robins)
,
E. louisae
(Böhlke & Robins)
and
E. lori
Colin
).
Description
. Morphometrics of
holotype
and four largest
paratype
specimens (21.0–
28.4 mm
SL) as percent of standard length (mean): head length 22.5–24.7 (23.3); snout length 3.7–4.2(3.9); eye diameter 6.0–6.8(6.3); postorbital distance 13.5–14.9(14.3); depth of body at dorsal fin origin 15.5–16.1(15.7); least depth of caudal peduncle 11.0– 12.3(11.4); upper jaw length 6.5–8.4(7.6); pectoral fin length 19.3–20.8(20.0); ventral fin length 17.3–18.3(17.7); caudal fin length 17.1–20.0(17.7); maximum width of color stripe 5.1–6.4(5.8).
Body naked, elongate. Mouth subterminal, no canine teeth on jaws. Dorsal fin without elongated anterior spines. Caudal fin rounded and ventral fin cup complete.Dorsalfin rays VII, 11–12 (modally 12); Analfin rays 11; pectoralfin rays 17–18 (modally 18).Color pattern
: a pale (bright yellow in life) stripe extending from the eye to the caudalfin base, stripe narrower close to eye (more uniform in juveniles); a pale (bright yellow in life) oval spot present on snout; dark longitudinal stripe wide, reaching lower abdomen and base of anal fin; all finrays except caudal black or dusky.
Remarks
:
Elacatinus pridisi
differs from the other two Brazilian species of the genus by its higher number of pectoralfin rays and by its wider extension of its dark pigmentation, reaching the abdomen as well as dorsal and analfin rays (
Figure 3
).
FIGURE 4
: Trindade Island (20°30'S, 29°20'W), type locality of
Elacatinus pridisin. sp.
, off the state of Espírito Santo, Brazil (Photograph by J. L. Gasparini).
Distribution
: The new species was collected only from Trindade Island (
20°30'S
,
29°20'W
), a volcanic formation off southeastern
Brazil
(
Figure 4
) and is probably endemic to the TrindadeMartin Vaz oceanic insular complex (Figure 5).
FIGURE 5
: Western South Atlantic, with the
indication of the insular complex of Trindade
and
MartinVaz Islands, a volcanic formation about
1160 Km off Brazil, type locality of
Elacatinus
pridisi
n. sp.
Etymology
: The name
pridisi
is used in honor of the Brazilian Navy First District (Primeiro Distrito Naval, Marinha do
Brasil
"PRIDIS"), in recognition for the impeccable logistic support provided during the authors´field trips to the
type
locality.
Natural History
:
Elacatinus pridisi
was recorded at depths ranging from
3 to 30 m
over crustose algal reefs and rocky bottoms around Trindade Island. The new species performs cleaning activities during most of its lifecycle, and has, at least, 21 different client species (
Gasparini & Floeter, 2001
).