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Euploide ciliates in sea ice of the Weddell Sea (Antarctica)

100%

Agatha S. , Wilbert N. , Spindler M. , Elbrachter M.

nr 3

Summer phytoplankton composition in transect from Weddell Sea to La Plata

100%

Economou-Amilli A. , Elster J. , Komárek J. , Economou-Amilli A. , Elster J. , Komárek J.

nr 3-4

Sea ice microalgae at the northern boundary of the pack ice between Elephant Island and South Orkney Islands (December 1988 - January 1989)

100%

Ligowski R. , Ligowski R.

Distribution of net phytoplankton in the sea-ice zone between Elephant Island and the South Orkney Islands (December 1988 - January 1989)

100%

Ligowski R. , Kopczyńska E. , Ligowski R. , Kopczyńska E.

nr 4

Antarctic Halacaridae (Acari), new records, these species characteristics and an updated list of species

100%

Bartsch I.

nr 1

Helicometra pisanoae sp.n. [Digenea, Opecoelidae], a parasite of a fish, Trematomus hansoni, in the Eastern Antarctic

67%

Zdzitowiecki K.

nr 1

Helicometra pisanoae sp. n. (Digenea, Opecoelidae) is described based on adult specimens from a fish, Trematomus hansoni (Nototheniidae) caught at the Adelie Land (Eastern Antarctic). The newly described species belongs to the group of species with the terminal, infundibuliform oral sucker. The other diagnostic features are: the sucker ratio based on mean diameter 1:0.84-1.02, blind intestinal caeca, the genital pore closely anterior to the intestinal bifurcation, the cirrus sac reaching posteriorly to the level of posterior half of the ventral sucker and the vitelline follicles reaching to the level of the ventral sucker.

Digenea of fishes of the Weddell Sea. V. Two new species of the genus Steringophorus [Fellodistomidae]

67%

Zdzitowiecki K.

nr 3

Steringophorus arntzi sp. n. is described from notothenioid fishes, Bathydraco marri (type-host, Bathydraconidae) and Dolloidraco longedorsalis (Artedidraconidae). This species resembles S. furciger (Olsson, 1868), but it is distinguished from that by eggs with a short filament, entire ovary (only with irregular margins), less elongate body and a post-bifurcal genital pore. Its area of distribution, the Antarctic, is distant from that of S. furciger (in the north hemisphere). Steringophorus liparidis sp. n. is described from Paraliparis antarcticus (Liparididae). This species resembles S. thulini Bray et Gibson, 1980, but it is distinguished by eggs with a spine on the anopercular pole, longer intestinal caeca, vitelline fields situated more anteriorly in relation to the ventral sucker, different hosts (liparidids contrary to gadiforms) and area of distribution (the Antarctic contrary to the north Atlantic). Occurrence of fellodistomid digeneans in the Antarctic subcontinental waters is recorded for the first time.

Occurrence of Digenea in fishes of the family Bathydraconidae in the Weddell Sea and other areas of Antarctica

67%

Zdzitowiecki K.

nr 4

Four digenean species, Stenakron glacialis, Lepidapedon garrardi, Steringophorus arntzi and Otodistomum cestoides (metacercariae) were recorded in three of four bathydraconid species (59 specimens) examined in the Weddell Sea. The only previously reported species, Elytroplicilloides oatesi, was found there only in other hosts. The total number of digenean species known as occurring in Bathydraconidae in Antarctica increased to 13. They were recorded in eight of ten host species examined. However, only a few specimens of most of bathydraconid species were investigated. Most of digenean species are more abundant in other fishes, especially in Nototheniidae and Channichthyidae. S. arntzi and S. glacialis normally occur in Bathydraco marri and Racovitzia glacialis respectively, but they were occasionally found also in Artedidraconidae; the latter was reported also from a liparidid. Intensities of infections are usually low, except in three large predatory species, Parachaenichthys charcoti, P. georgianus and Cygnodraco mawsoni, which can be parasitized by about 100 or more digeneans in some single hosts.

Digenea of fishes of the Weddell Sea. IV. Three opecoelid species of the genera Neolebouria, Helicometra and Stenakron

67%

Zdzitowiecki K.

nr 3

The following opecoelid digeneans are described from bony fishes of the Weddell Sea: Neolebouria terranovaensis Zdzitowiecki, Pisano et Vacchi, 1993 from Paraliparis antarcticus (Liparididae, new host family); Helicometra rakusai sp. n. from Trematomus loennbergi (Nototheniidae); Stenakron glacialis Zdzitowiecki, 1989 from Racovitzia glacialis (Bathydraconidae) and Pogonophryne marmorata (Artedidraconidae, new host family). H. rakusai sp. n. has terminal oral sucker (similarly to the second Antarctic species, H. antarcticae Holloway et Bier, 1968), but its ventral sucker is considerably smaller than the oral sucker - sucker ratio based on mean diameter 1:0.71-0.87 (mean 1:0.81), that based on width 1:0.65-0.99 (mean 1:0.83). Both other species are recorded in the Weddell Sea for the first time.