Volume 20, Issue 1 – 15 January 2014
Volume 20, Issue 1 – 15 January 2014
Alejandro A. Vagelli: Ephemeral Sexual Dichromatism in Quinca mirifica (Teleostei, Apogonidae), a Black Apogonid with Solitary Behavior, pp. 1-10
During their courtship behavior males Quinca mirifica Mees 1966 exhibit a rapid dramatic color change, from their normal deep-black coloration to a brilliant silvery/white displayed on most of their body including areas of the dorsal and pelvic fins. Such a well-defined and striking ephemeral sexual dichromatism has not been previously reported in Apogonidae. It is suggested that this trait developed in Q. mirifica because of the reproductive advantage that it conferred to an apogonid possessing a marked solitary/cryptic behavior and an appropriate physiological mechanism suited for such rapid and dramatic color changes.
Normal deep-black coloration in both sexes of Quinca mirifica. Specimen photographed in the wild. B-C. Breeding pair displaying mating behavior. The sexual dichromatism in males Q. mirifica is very brief, and seems to signal acceptance of the female and readiness to mate. As soon as the pair begins mating behaviors, the male (here both in the background) recovers the normal coloration… Photos by A. A. Vagelli
Toshiyuki Suzuki and John E. Randall: Four new gobiid fishes of the genus Bryaninops from the East Indies, pp. 11-26
Four new species of the gobiid fish genus Bryaninops are described: B. annella from 19 specimens collected from sea fans of the genus Annella from Bali, Indonesia and Lizard Island, Great Barrier Reef; B. earlei from nine specimens collected from a sea pen and adjacent seagrass in the D’Entrecasteaux Islands, Papua New Guinea; B. tectus from six specimens collected from the gorgonian Ellisella quadrilineata at Linnet Reef, Great Barrier Reef; and B. translucens from two specimens commensal on a sponge in the Mentawai Islands off SW Sumatra. Bryaninops annella is closely related to B. amplus Larson and B. loki Larson with which it shares a rounded, cup-like, pelvic-fin disc, the same dorsal and anal fin-ray counts, and slender head and body; it differs in having the gill opening extending forward slightly before the posterior margin of the preopercle, longitudinal scale series 34-45, and transverse scale rows 8–10. The three species differ also by a modal count of one in pectoral-ray counts (annella with 14, loki with 15, and tectus with 16). Bryaninops earlei differs from all congeners in having large ctenoid scales (22-25 in longitudinal series); it is similar to B. natans in lacking a canal connecting posterior interorbital pores, but clearly different in having scales extending anteriorly onto the nape. Bryaninops tectus is closely related to B. nexus Larson and B. erythrops (Jordan and Seale), with which it shares the absence of anterior and posterior nostrils. It differs from these two species in lacking ctenoid scales below the second dorsal fin, above the anal fin, and on the ventral side of the caudal peduncle. Bryaninops translucens is closely related to B. dianneae Larson and B. spongicolus Suzuki, Bogorodsky & Randall, with which it shares an oblong and very flat pelvic disc, instead of rounded and cup-like as in most other species of the genus. It differs also from these two species in having ctenoid scales on the nape and a wide, anteriorly- directed pocket on the pelvic frenum.
Bryaninops annella n. sp., Indonesia, Bali, northwest coast, Tulamben. Photo by J. E. Randall.
Dalton Tavares Bressane Nielsen, Mayler Martins, Luciano Medeiros de Araujo and Rogério dos Reis Suzart: Hypsolebias shibattai, a new species of annual fish (Cyprinodontiformes: Rivulidae) from the rio São Francisco basin, northeastern Brazil, pp. 27-34
Hypsolebias shibattai n. sp. is described from a temporary pool located in the rio São Francisco basin, state of Bahia, Brazil. Hypsolebias shibattai belongs to the H. magnificus species-group. This new species differs from all other species of Hypsolebias by having a unique color pattern in the males: a golden-yellow coloration on the head, opercular region and body up to the beginning of the dorsal fin (vs. absence of golden-yellow color on anterior portion of body).
Hypsolebias shibattai, ZUEC 7648, male, holotype, 32.3 mm SL: Brazil, Bahia, Bom Jesus da Lapa. Photo by R. Suzart.
Gerald R. Allen, Renny K. Hadiaty and Peter J. Unmack: Melanotaenia flavipinnis, a new species of Rainbowfish (Melanotaeniidae) from Misool Island, West Papua Province, Indonesia, pp. 35-52
A new species of melanotaeniid rainbowfish, Melanotaenia flavipinnis, is described from Misool Island in the Birds Head region of western New Guinea (West Papua Province, Indonesia). The new taxon is described from 20 specimens, 38.5-77.2 mm SL, collected from two creeks on southeastern Misool. It is the second rainbowfish known from this island, which lies about 67 km south of the New Guinea mainland. It is distinguished from congeners, and especially from M. misoolensis, by a combination of features that include a distinctive colour pattern with yellow dorsal, anal, and pelvic fins, usually 18-19 rakers on the first gill arch, 11-16 cheek scales, 12-13 circumpeduncular scales, first dorsal fin situated well behind anal fin origin, presence of both vomerine and palatine teeth, conspicuously rounded anal fin with relatively elongate rays on the anterior half, and relatively slender body in both sexes (greatest depth usually less than 35% SL).
Aquarium photograph of freshly collected paratype of Melanotaenia flavipinnis, male, 71.4 mm SL (WAM P.31552-001), Gam River, Misool. Photo by G. R. Allen.
Dalton Tavares Bressane Nielsen and Roger Brousseau: Description of a new annual fish, Papiliolebias ashleyae (Cyprinodontiformes: Rivulidae) from the upper Rio Mamoré basin, Bolivia, pp. 53-59
Papiliolebias ashleyae n. sp. is described from Bolivia, departamento de Santa Cruz, Rio San Pablo, upper Mamoré basin. Papiliolebias ashleyae n. sp. is distinguished from other Papiliolebias species by a combination of characters: male overall color pattern of body, caudal- and pelvic-fins brownish red (vs. dark blue); transverse brownish red bars in dorsal and anal fins located between black and white bar at base of dorsal and anal fins and blue area in distal part of dorsal and anal fins (vs. absence of red-brown stripe on the remaining species of the genus, where the color of dorsal and anal fins is blue with a black stripe and white spots at the base of the fins); dorsal-fin origin at vertical through base of anal fin rays 9th-10th (vs. dorsal fin origin at vertical through base of anal fin rays 7th-8th in P. bitteri and 6th-9th in P. hatinne) and pelvic fins separated by small interspace of 4 mm (vs. not separated).
Papiliolebias ashleyae, male, holotype, 34.7 mm SL: Bolivia, San José dos Chiquitos (in life). Photo by D. Nielsen.