Elacatinus pridisi
- Dataset
- A new cleaner goby of the genus Elacatinus (Teleostei: Gobiidae), from Trindade Island, off Brazil.
- Rank
- SPECIES
- Published in
- Ricardo Z. P. Guimarães, Joao Luiz Gasparini, Luiz A. Rocha (2004): A new cleaner goby of the genus Elacatinus (Teleostei: Gobiidae), from Trindade Island, off Brazil. Zootaxa 770: 1-8, URL: http://www.zoobank.org/urn:lsid:zoobank.org:pub:66E56D98-831B-4F41-A163-7AE1A9B4639B
Classification
- kingdom
- Animalia
- phylum
- Chordata
- order
- Perciformes
- family
- Gobiidae
- genus
- Elacatinus
- species
- Elacatinus pridisi
biology_ecology
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 life-cycle, and has, at least, 21 different client species (Gasparini & Floeter, 2001).
description
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. Dorsal-fin rays VII, 11 - 12 (modally 12); Anal-fin rays 11; pectoral-fin rays 17 - 18 (modally 18). Color pattern: a pale (bright yellow in life) stripe extending from the eye to the caudal-fin 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 fin-rays except caudal black or dusky.
diagnosis
Diagnosis: Elacatinus pridisi n. sp. differs from its congeners of the Horsti Complex (sensu Boehlke & Robins 1968) that have a pale stripe extending from the eye to the caudal-fin 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); pectoral-fin rays typically 18 (vs. typically 17 in E. randalli and E. figaro and typically 16 in E. atronasum (Boehlke & Robins )); anal-fin rays typically 11 (vs. typically 10 in E. figaro); oval spot present on snout (vs. no spot in E. atronasum and E. horsti (Boehlke & Robins), a " V " - shaped spot in E. prochilos (Boehlke & Robins), and a medial bar in E. xanthiprora (Boehlke & Robins), E. louisae (Boehlke & Robins) and E. lori Colin).
discussion
Remarks: Elacatinus pridisi differs from the other two Brazilian species of the genus by its higher number of pectoral-fin rays and by its wider extension of its dark pigmentation, reaching the abdomen as well as dorsal and anal-fin rays (Figure 3).
distribution
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 Trindade-Martin Vaz oceanic insular complex (Figure 5).
etymology
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.
materials_examined
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. Guimaraes, 10 th October 1998.
materials_examined
Comparative material: Elacatinus randalli: ANSP 110672 (1 ind., 21.1 mm SL, holotype), ANSP 110673 (5 ind., 19.0 - 27.5 mm SL, paratypes), St. Vincent Islands; ANSP 110679 (1 ind., 27.3 mm SL, paratype), ANSP 110680 (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 0494 (3 ind., 21 - 37.7 mm SL), LBRP 0728 (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.
Name
- Homonyms
- Elacatinus pridisi