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aqua International Journal 3(1)



Volume 3, Issue 1 – April 1998

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Volume 3, Issue 1 – April 1998

Gerald R. Allen, Walter Ivantsoff, Margaret A. Shephert and Samuel J. Renyaan:  Pseudomugil pellucidus (Pisces: Pseudomugilidae), a newly discovered blue-eye from Timika-Tembagapura region, Irian Jaya, pp. 1-8


Pseudomugil pellucidus, a new species of blue-eyes, is described on the basis of 30 specimens collected from tributaries of the Iweka and Kopi rivers in the vicinity of Tembagapura, Irian Jaya. The new species is very closely related to P. novaeguinaeae but is distinct from the latter on the basis of greater number and length of first dorsal fin spines, number of anal rays, shape of vomer, basibranchials, pectoral girdle, urohyal, and anal pterygiophores. The new species is different in coloration; and is also quite transparent.

Gerald R. Allen and M. N. Feinberg: Descriptions of a New Genus and Four New Species of Freshwater Catfishes (Plotosidae) from Australia, pp. 9-18


A new genus and four new species of plostosid catfishes are described from frsh waters of Australia. Neosiluroides, new genus, differs from all other plotosid genera by the possession of two, apparently derived, characters, namely a thick epidermal covering around the posterior nostril, which forms an outer chamber, and a peculiar ski structure, consisting of a dense covering of minute papillae. In addition, it is separable from nearly all other Australiana and New ginean freshwater catfishes by its high vertebral count. The genus contains a single member,  N. cooperensis, new species, which is described from 32 specimens, 167-346.5 mm SL, from the Cooper Creek system of north-eastern South Australia and adjacent south-western Queensland. Neosilurus gloveri, new species, is described from 64 specimens, 36-84 mm SL, collected from warm artesian pools at Dalhousie Sprigs in the desert of northern South Australia. It grows to a maximum size of about 84 mm SL. It is the smallest member of the family and is further characterized by 38-42 total vertebrae, 14-16 total gill rakers on the first branchial arch, 7-9 soft pectoral rays, and 7-8 branchiostegal rays. Neosilurus pseudospinosus, new species, is described from 279 specimens, 24-333 mm SL, collected from the Kimberley region of north-western Australia. It is closely related to N. mollespiculum, new species, which is described from 11 specimens, 39-345 mm SL, collected from the Burdeki River system of north-eastern Queensland. Both resemble N. ater or northern Australia and southern New Guinea, but differ in having lower gill raker counts and soft, flexible dorsal and pectoral fin spines. N. pseudospinosus differs from N. mollespiculum primarly in having a greaer average umber of procurret caudal rays, a slightly shorter dorsal-caudal fin base, and a longer nasal barberl.

Victor G. Springer, Hans Bath and John E. Randall: Remarks on the species of the Indian Ocean Fish Genus Alloblennius Smith-Vaniz & Springer 1971, (Blenniidae), pp. 19-24


Females of Alloblennius anuchalis (Springer & spreitzer, 1978), previously known only from the male hototype, are described and illustrated. Thez differ from the male, and both sexes of the three other Alloblennius species, in having alternating dark and pale bands in the anal fin. Geographic range extensions are noted for A. anchalis, A. parvus, and A. pictus. Males of A. parvus from Mauritius, but not Comores, have statistically significantly higher mean numbers of segmented dorsal- and anal-fin rays, and caudal vertebrae, than do females from their respective localities. Colour photographs of all four Alloblennius species are included.

John E. Randall: Review of the Cardinalfishes (Apogonidae) of the Hawaiian Islands, with descriptions of two new species, pp. 25-38


The 10 species of apogonid fishes of the Hawaiian Islands are differentiated in a key. Paseudamiops diaphanes, sp. n., endemic to Hawaii, is distinct in having VI-I,8 dorsal rays, II,8 anal rays, 16-18 pectoral rays, a spine-like ventral projection posteriorly on the maxilla, deciduous cycloid scales, no lateral line, a rhomboid caudal fin, and in being transparent in life. Apogon deetsie, sp. n., from the Hawaiian Islands and Tuamotu Archipelago, has VI-I,9 dorsal rays, II,8 anal rays; 11-12 (usually 12) pectoral rays, 24 lateral-line scales, 6 predorsal scales, 3-4 + 12-13 gill rakers, a protruding membranous flap on corner and lower edge of preopercle, a forked caudal fin with rounded lobes, and is light red with two blackish bars posteriorly on the body. The remaining species are diagnosed, and their distributions given, Apogon erythrinus Snyder appears to be endemic to Hawaii and Johnston Island; A. maculiferus Garrett is also a Hawaiian endemic; A. evermanni Jordan and Snyder is widespread in the Indo-Pacific and is also known from the western Atlantic; A. kallopterus Bleeker, A. taeniopterus Bennett (A. menesemus Jenkins is a synonym), Apogonichthys perdix Bleeker (A. waikiki Jordan and Evermann is a synonym), Foa brachygramma (Jenkins), and Lachnearatus phasmaticus Fraser and Struhsaker are wide-ranging Indo-Pacific species.

Ivan Sazima, João Luiz Gasparini and Rodrigo L. Mourra: Gramma brasiliensis, a new basslet from the western South Atlantic (Perciformes: Grammatidae), pp. 39-43


The basslet Gramma brasiliensis sp. n. is described from the coast of Brazil. The new species differs from its congeners by the combination of the following characters: upper jaw extending a distance of about one pupil diameter beyond rear margin of eye, first dorsal-fin spine noticeably shorter than the remainder, life color of anterior part of body purple to violet and posterior part yellow to orange, yellow streaks on head absent. Gramma brasiliensis sp. n. represents the southernmost record for this genus.

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Dimensions 266 × 203 × 3 cm
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