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aqua International Journal 4(1)

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COMPLETE ISSUE

Volume 4, Issue 1 – June 2000

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COMPLETE ISSUE

Volume 4, Issue 1 – June 2000

John E. Randall and Bruce A. Carlson: The Pygmy Angelfish Centropyge woodheadi Kuiter, 1998, a Synonym of C. heraldi Woods and Schultz, 1953, pp. 1-4

Abstract

Centropyge woodheadi Kuiter, 1998 is regarded as e junior synonym of C. heraldi Woods and Schultz, 1593. the 4 measurements reported to differentiate woodheadi from heraldi could not be duplicated by taking the same measurements of 7 specimens of the woodheadi  form and 18 typical C. heraldiof about the same range in standard length. The woodheadi form has been observed to lose the diagnostic broad black band in the soft portion of the dorsal fin in an aquarium. In addition to records of the woodheadi form from Samoa, Fiji, Tonga, Coral Sea, and Solomon Islands, one specimen is reported from Huahine, Society Islands, and one from Kwajalein Atoll, Marshall Islands.

Ronald E. Watson, Gerard Marquet and Christine Pollabauer: New Caledonia Fish Species of the genus Sicyopterus (Teleostei: Gobiodei: Sicydiinae), pp. 5-34

Abstract

Sicyopterus Gill from New Caledonia is Reviewed and the genus is diagnosed. Sicyopterus lacogephalus (Pallas) has a wide geographic distribution: it occurs in streams on the Comoro and Mascarene Islands in the western Indian Ocean; on society Islands in the central Pacific and is known to extend from New Caledonia to southern Japan. Sicyopterus lacogephalus is distinguished from its congeners by 11 segmented rays in the second dorsal fin and by the following combination of characters: usually 9 (17-22) pectoral rays; scales in predorsal midline usually 13-16 (11-20) with anterior scales smaller than those posteriorly; scales in lateral series usually 51-54 (49-59); scales on trunk and belly about same size as on caudal peduncle; transverse forward scales usually 18; ventral edge of upper lip usually smooth with clefts anteriorly and midlaterally; and caudal fin with a blackish horseshoe-shaped band close to margin and medial rays dusky to blackish usually extending to horseshoe-shaped band. No type is known to exist and for this reason a neotype for Gobius lagocephalus is designated. Sicyopterus sarasini Weber & de Beaufort is an uncommon New Caledonia endemic. It is distinguished from all congeners by the presence of 10 segmented rays in the second dorsal fin and by the following combination of characters: usually 19 pectoral rays; scales in predorsal midline small, cycloid and variable (0-26); scales I lateral series 45-65, with scales on flanks much smaller than those on caudal peduncle which may be widely separated; transverse forward scales variable, with ventral scales small (14-31); scales o belly much smaller than on caudal peduncle and belly may be fully scald or entirely naked; ventral edge of upper lip usually with some crenulation and clefts anteriorly and midlaterally. Males of S. sarasii differ from congeners with clefts present anteriorly and midlaterally in upper lip, in not hving scales embedded anteriorly or covered marginally with spongy tissue. A lectotype for Sicyopterus sarasini is designated from the original syntype series.

Igor V. Mitrofanov: The Biodiversity of the genus Leuciscus in Central Asia (Cyprinidae), pp. 35-43

Abstract

Data published since the beginning of the 20th century on 64 populations of dace from Europe, Central Asia, Kazakhstan, and Siberia were analysed. Four discriminant meristic characters used previously to identify species and subspecies were utilized in this study. Cluster and Principal Component analyses used to assess similarities and differences in the dace populations suggest that all dace populations of Kazakhstan and Central Asia appear to form a linear continuum of relationships. Most populations within the distribution of each species or subspecies of this continuum are similar, however there is at least one population that is similar to another species or subspecies. It is our opinion that all of the populations of dace from Kazakhstan (excluding those of the Ural Basin) and Central Asia belong to one polytypic species.

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