 |
Ivan Sazima and Cristina Sazima: Daytime hunting behaviour of Echidna catenata (Muraenidae): why chain morays foraging at ebb tide have no followers, pp. 1-8¬Ý
The
daytime foraging of the chain moray (Echidna catenata) on grapsid crabs on exposed
reefs at ebb tide and in tide-pools was studied in the Fernando de Noronha
Archipelago, western Equatorial Atlantic (03°50÷S, 32°25÷W). Four hunting
tactics were recorded both in and out of the water: (1) search at pool rims and
rock bases, poking into crevices and holes; (2) stealthy approach to previously
sighted prey; (3) chasing of prey; (4) ambush from crevices and under rocks. As
the chain moray uses varied hunting techniques and its crab hunting is mostly
visually guided, its generally unobtrusive foraging attracts little or no
attention from tide-pool fishes. Part of the foraging is done out of the water
on exposed reefs; fish are therefore unable to follow the moray and take
advantage of its hunting activities.
Javad
Ghasemzadeh, Walter Ivantsoff and
Aarn: Historical overview of mugilid systematics, with description of Paramugil (Teleostei; Mugiliformes;
Mugilidae), new genus, pp. 9-22
The history of the systematic relationships
of the mugilids is reviewed, concluding with the modern concept of Mugilidae
comprising 17 genera with 80 species, one of five taxa
comprising ?Smegmamorpha÷. Paramugil, new genus, is erected for P. georgii and P. parmata, and 18 diagnostic
morphological and osteological differences between Paramugil and Liza and/or Mugil and/or Valamugil listed.
Gerald R. Allen and Roger C. Steene: Chaetodontoplus vanderloosi,
a new
species of angelfish (Pomacanthidae) from Papua New Guinea, pp. 23-30
A new
species of pomacanthid fish, Chaetodontoplus vanderloosi, is described from 3 specimens,
117.8-125.2 mm SL, collected at Samarai Island, Milne Bay Province, Papua New
Guinea in 1972 and 2003. It is closely related to C. dimidiatus and C. melanosoma from Indonesia and the
Philippines, but differs in colour pattern. The new species is mainly black
except the head and adjacent dorsoanterior body is light grey to nearly white,
with a predominately black caudal fin (except broad yellow posterior margin).
Small juveniles are mainly black with a yellow median facial band, a yellow
diagonal band from just in front of the dorsal fin to the pelvic fins, a broad
yellow margin covering most of the dorsal fin, and a yellow caudal fin with a
black submarginal bar.
Jansen
Zuanon and Ivan Sazima: Vampire catfishes seek the aorta not the jugular: candirus
of the genus Vandellia
(Trichomycteridae)
feed on major gill arteries of host fishes, pp. 31-36
Species
of the trichomycterid catfish genus Vandellia (candirus) feed on blood from other fishes,
usually entering the gill chamber of their hosts. However, exactly where these
vampire fish attach themselves in the chamber to take blood remains unrecorded.
Herein we present evidence that two candiru species, Vandellia cirrhosa and V. sanguinea, seek the major gill arteries.
Both species bite mostly at the ventral or dorsal arteries, and the blood is
presumably pumped into their gut by the hosts÷ blood pressure. We suggest that candirus
do not need any
special sucking or pumping mechanism become rapidly engorged themselves with
blood but simply use their needle-like teeth to make an incision in an artery.
This being the case, the notion of blood-sucking by the candiru is misleading.
John
E. Randall and John L. Earle: Novaculoides, a new genus for the Indo-Pacific
labrid fish Novaculichthys macrolepidotus, pp. 37-43
The new
genus Novaculoides is proposed for one species of labrid fish previously classified
as Novaculichthys macrolepidotus (Bloch). The genus is distinct from Novaculichthys in possessing the following
characters: anterior pair of canine teeth in jaws curving laterally; two or
three oblique rows of small embedded scales on cheek; head short, its length
3.4-3.65 in SL; body moderately elongate, the depth 2.8-3.0 in standard length;
longest dorsal and anal soft rays about equal in length; pelvic fins of males
often longer than head, 3.1-4.2 in standard length. Novaculichthys is now monotypic for the species
taeniourus
(Lacépède).
|