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John
E. Randall: Thalassoma nigrofasciatum, a new species of labrid fish from the
south-west Pacific, pp. 1-8
Thalassoma
nigrofasciatum
is described as a new species of Labridae from the Great Barrier Reef, vauatu,
Lord Howe Island, Norfolk Island, Chesterfield Bank, New Caledoia, Loyalty
Island, Fiji, and Tonga. It is typically found on exposed outer-reef areas from
tide pools to dephts of at least 15 m. Previously identified as T. jansenii (Bleeker), it differs in colour
and in having a deeper caudal peduncle and longer paired fins.
Richard
Winterbottom: A new species of Trimma (Gobiidae) from the western Indian
Ocean, pp. 9-12
A new
species of the genus Trimma is described. Trimma volcana is characterized by having large spots
on the head and body, moderate to well-developed interorbital and postorbital
trenches, scales present on the pectoral and pelvic fin bases but not on the
cheecks, opercles, or midline of the nape, a posterior nostril which is adnate
to the eye, and a fifth pelvic fin ray that is 80-9% of the fourth and is
branched dichotomously twice. Trimma volcana has been found off Tanzania, Mozambique
and the Comores Islands.
Richard
Winterbottom and Cesar A. Villa: A new species of the Trimma caesiura complex (Gobiidae, Teleostei)
from the north-eastern margin of the Australian Plate, with a redescription of
the other nominal species in the complex, pp. 13-28
A new
species of Trimma caesiura species complex, T. lantana, is described from the north-eastern
margin of the Australasian plate and the Solomon Islands, and four other
species of the complex are redescribed. This species complex is defined by the
possession of a deep, steep-sided trench between and posterodorsal to the
orbits. The new species differs from its congeners in the presence of two
brick-red or brown, dark-edged, rounded blotches over the vertical limb of the
preopercle, and smaller but similar blotches, on the cheek below the eye and on
the dorsal surface of the snout. It differs further from T. caesiura in having an elongate spine in
the first dorsal fin and ventrolateral white spots on the caudal peduncle, and
in lacking thin white bars on the cheek. Trimma baudei has a club-like red bar over the
vertical limb of the preopercle and a distinct dark bar over the bases of the
pectoral fin rays (the latter diffuse or absent in T. lantana). Two other nominal species that
appear to belong to this complex are redescribed here. Both T. mendelssohni and T. winterbottomi have more than a single branch
in the fifth pelvic fin ray,
usually more pectoral fin rays (a mean of 18 vs. 16), and a posterior
nasal opening adnate to the anterior margin of the eye (vs. distinctly separate
from the eye margin). The taxonomic status of two other species in this
complex, T. corallinum and T. omanensis, is currently under review elsewhere, and these species are
not considered further here.
Marta
S. C. Soares, Luis Sousa and João Pedro Barreiros: Feeding habits fo the lizardfish Synodus
saurus
(Linnaeus, 1758) (Actinopterygii: Synodontidae), pp. 29-38
The
feeding habits of the lizardfish Synodus saurus, were studie in the Azores archipelago,
north-eastern Atlantic. Factors examined were diet composition, prey
importance, season, fish size, feeding straegy and prey orientation in the
oesophagus. The stomach contents of 308 specimens were collected and analyzed
between March and November 2000. Synodus saurus is common in Azorean water.
Though it prefers small grearious pelagic fish, it also feeds on epibenthic and
benthic prey. We found the following prey in its diet: 9 families of teleostean
fishes (Carangidae, clupeidae, Cynoglossidae, Gobiidae, Labridae, Myctophidae,
Spaidae, Spyraenidae and Synodontidae), two families of crustaceans
(Cymothoidae and Scyllaridae) and one of cephalopods (Loliginidae). The
European pilchard, Sardina pilchardus was the commonest prey. The diet of the
lizardfish varies with the season, showing the greatest diversity (given by the
Shannon-Wiener index) im October. There is a significant correlation with the
sea temperature. The size of the predator is not correlated to the size of its
prey. However, we observed a ositive correlation between the size o the
positive correlation between the size of the predator and the quantity of food
in its stomach. The orientation of the prey in the oesophagus may partly depend
on the predador÷s size. However, analysis of the stomach contents provided no
information on the selection of prey.
Wilson
J. E. M. Costa: Rivulus paracatuensis n. sp. (Cyprinodontiformes:
Rivulidae):a new rivuline species from the Rio São Francisco basin, Brazil, pp.
39-43
Rivulus
paracatuensis n.
sp. is described from a small stream in the Rio Paracatú floodplains, Rio São
Francisco basin, Minas Gerais, Brazil. It was previously misidentified as R.
decoratus, the
only other species of the genus occurring in the São Francisco basin, but
described from Ibiraba, Bahia, which is about 1,000 km north of the Rio
Paracatú. The new species is easily distinguished from R. decoratus by having more dorsal, caudal
and pectoral fin rays, more vertebrae, more scales in the longitudinal series
and more scale rows around the caudal peduncle, a wider basihyal, and a
distinct male colour pattern.
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