Elacatinus pridisi , Guimarães, Ricardo Z. P., Gasparini, João Luiz & Rocha, Luiz A., 2004

Guimarães, Ricardo Z. P., Gasparini, João Luiz & Rocha, Luiz A., 2004, A new cleaner goby of the genus Elacatinus (Teleostei: Gobiidae), from Trindade Island, off Brazil, Zootaxa 770, pp. 1-8: 3-7

publication ID

10.5281/zenodo.158021

publication LSID

lsid:zoobank.org:pub:66E56D98-831B-4F41-A163-7AE1A9B4639B

persistent identifier

http://treatment.plazi.org/id/03D66645-BD0D-FF9A-4208-FECB6DDCFDE1

treatment provided by

Plazi

scientific name

Elacatinus pridisi
status

sp. n.

Elacatinus pridisi  sp. n.

Trindade cleaner goby ( Figs. 1–3View FIGURE 1View FIGURE 2View FIGURE 3)

Type series: Holotype: MNRJAbout 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: LBRPAbout 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), MNRJAbout MNRJ 21981 (2 ind., 20.2, 20.5 mm SL, undetermined), USNMAbout USNM 365990 (1 ind., 21.0 mm SL, undetermined), collected with the holotype; UFESAbout UFES 1424 (1 ind., 28.4 mm SL, undetermined), ZUECAbout 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, 8 th April 2001.

Additional material: LBRPAbout 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, 10 th October 1998.

Comparative material: Elacatinus randalli  : ANSPAbout ANSP 110672 (1 ind., 21.1 mm SL, holotype), ANSPAbout ANSP 110673 (5 ind., 19.0– 27.5 mm SL, paratypes), St. Vincent Islands; ANSPAbout ANSP 110679 (1 ind., 27.3 mm SL, paratype), ANSPAbout ANSP 110680 (3 ind., 10.5–31.5 mm SL, paratypes), Venezuela; MNRJAbout MNRJ 12054 (2 ind., 19.8–23.4 mm SL 122.9 mm SL, c & s), Fernando de Noronha Archipelago. Elacatinus figaro  : LBRPAbout LBRP 0 494 (3 ind., 21–37.7 mm SL), LBRPAbout LBRP 0 728 (7 ind., 24–30.75 mm SL, 2 ind., 24.2–27.5 mm SL c & s), LBRPAbout LBRP 3084 (1 ind. 36.7 mm SL), LBRPAbout LBRP 3494 (20 ind. 26.1 –30.0 mm SL), LBRPAbout 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 pridisi  n. sp. differs from its congeners of the Horsti  Complex (sensu Böhlke & 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 in E. randalli  and E. figaro  and typically 16 in E. atronasum (Böhlke & Robins))  ; anal­fin rays typically 11 (vs.

typically 10 in E. 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 3View FIGURE 3).

Distribution: The new species was collected only from Trindade Island (20 ° 30 'S, 29 ° 20 'W), a volcanic formation off southeastern Brazil ( Figure 4View FIGURE 4) and is probably endemic to the Trindade­Martin Vaz oceanic insular complex (Figure 5).

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).

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro

LBRP

Laboratorio de Biodiversidade de Recursos Pesqueiros

USNM

Smithsonian Institution, National Museum of Natural History

UFES

Universidade Federal do Espirito Santo

ZUEC

Museu de Zoologia da Universidade Estadual de Campinas

ANSP

Academy of Natural Sciences of Philadelphia