Volume 11, Issue 1, February 2006
Volume 11, Issue 1 – 1 February 2006
Gerald R. Allen: Cirrhilabrus brunneus, a new wrasse (Pisces: Labridae) from north-eastern Kalimantan, Indonesia, pp. 1-4
Cirrhilabrus brunneus is described from a single male specimen, 43.6 mm SL, collected at north-eastern Kalimantan, Indonesia. It is one of only three species in the genus that possesses a lunate caudal fin. The new species, which is overall dark brown in colour, including the median and pelvic fins, closely resembles C. lunatus from the Ryukyu Islands, southern Japan, and the Ogasawara Islands. However, unlike the latter species, it lacks a broad orange-yellow zone along the sides at the level of the pectoral fins, a pale yellowish band along the base of the dorsal fin, and irregular diagonal red lines on the snout and the postorbital portion of the head that extends onto the anterodorsal part of the body. There is also a substantial difference in maximum size with males of C. lunatus attaining a maximum standard length of about 85 mm in comparison with less than 50 mm for C. brunneus.
Cirrhilabrus brunneus n. sp., freshly collected male holotype, 43.6 mm SL, Fiji Islands. Photo by G. R. Allen
Wilson J. E. M. Costa: Redescription of Kryptolebias ocellatus (Hensel) and K. caudomarginatus (Seegers) (Teleostei: Cyprinodontiformes: Rivulidae), two killifishes from mangroves of south-eastern Brazil, pp. 5-12
Taxonomy of Kryptolebias ocellatus (Hensel) and K. caudomarginatus (Seegers) has been poorly defined and mostly based on a few specimens bred in aquaria. They are considered valid species and are redescribed based on recent collections in the type locality area, the mangroves of Rio de Janeiro state, south-eastern Brazil. Both species are considered closely related to K. marmoratus (Poey), with which they share the presence of four neuromasts on the posterior supraorbital series, a long anterior nostril, and a bony laminar ventral process on the fifth ceratobranchial; K. ocellatus is distinguished by a unique colour pattern in the hermaphrodite, more slender caudal peduncle, and a shorter pelvic fin, and K. caudomarginatus by possessing more vomerine teeth, longer dorsal fin base, and a unique male colour pattern. The type locality of K. caudomarginatus is coorrected.
Kryptolebias ocellatus, hermaphrodite, UFRJ 6243, 46.8 mm SL; Brazil: Rio de Janeiro: Guaratiba. Photo by W. J. E. M. Costa
Gerald R. Allen, Forrest Young and Patrick L. Colin: Centropyge abei, a new species of deep-dwelling angelfish (Pomacanthidae) from Sulawesi, Indonesia, pp. 13-18
A new species of pomacanthid fish, Centropyge abei, is described from a single specimen, 90.8 mm SL, collected from a depth of 120 m during deep diving operations off Manado, Sulawesi in Indonesia during April 2005. It was also observed in similar habitat at Palau between 110-155 m using a research submersible. The combination of morphological features that include large scales (43-45 in lateral row from upper opercle to caudal fin base), 3-4 preopercular spines, a relatively narrow supracleithrum with pronounced serrae on its posterior upper margin, serrate interoperculum, and a posterior margin of the preorbital bone that is attached and hidden by skin and scales serve to distinguish it from all known angelfishes, although it appears to be a modified Centropyge. Moreover, its distinctive colour pattern consisting of an extensive black area on the back and dorsal fin that grades to yellow on the side, white bar behind the head, and white caudal fin, is unlike that of any known species in the family.
Freshly collected specimens of Centropyge abei n. sp., holotype, 90.8 mm SL, Manado Tua, Sulawesi, Indonesia. Photo by Kotaro Yoshimura.
John E. Randall and John L. Earle: Amblyeleotris neumanni, a new species of shrimp goby from New Britain, pp. 19-24
The gobiid fish Amblyeleotris neumanni is described as a new species from three specimens, 44.2-53.9 mm SL, collected in 26 m off Lolobau Island, New Britain, Papua New Guinea. It was observed in symbiotic association with the snapping shrimps Alpheus rapacida and A. sp., with which it shares a burrow. It is distinctive in having 12 or 13 dorsal soft rays, 13 anal soft rays, 19 pectoral rays, 98-100 scales in longitudinal series, males with filamentous third to fifth spines, lanceolate caudal fin, pelvic fins fully joined, pelvic frenum, and in colour: four broad dark orangish brown bars on body with irregular dark markings between; ocellated orange spots on spines and rays of dorsal fins; basal part of anal fin with adjacent narrow longitudinal bands of black, orange, blue, and blue-green; pelvic fins pale blue or green.
Amblyeleotris neumanni n. sp., female, Lolobau Island, New Britain. Photo by J. E. Randall
Basim Saeed, Walter Ivantsoff and Aarn: Descriptive anatomy of Iso rhothophilus (Ogilby), with a phylogenetic analysis of Iso and a redefinition of Isonidae (Atheriniformes), pp. 25-43
The musculoskeletal anatomy of Iso rhothophilus is described. A phylogenetic analysis of the genus, using eleven anatomical characters, indicates that the systematic hierarchy is (Iso flosmaris (I. nesiotes (I. rhothophilus (I. hawaiiensis, I. natalensis)))). Isonidae Rosen, 1964 is redefined and, on the basis of twenty characters (autapomorphic within Atheriniformes) shown to be distinct from Notocheiridae Schultz, 1950.
Iso rothophilus, MU I-122, 54 mm SL.