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Botaniska Notiser 1947, Häfte 3. Lund
Smärre uppsatser och meddelanden.
Leptonema fasciculatum, a brown alga epizoic on Caligus curtus.
In 1945 1 was working at the Zoological Station Kristineberg in Bohuslän,
on the west coast of Sweden. One day, the 25th of May to he precise, Mr.
R. Fänge gave me a Caligus specimen, which he had found that day on a
common cod, Gadus callarias L. from rather low water in the Gullmar Fjord
off Kristineberg. When determining the species of this parasitic copepode, a
female of Caligus curtus O. F. MCller, measuring about 10 mm in length,
I observed some small tufts on ils cephalothorax. which turned out to be
thread-like algae. Dr. T. Levring, Gothenburg, has kindly determined this
alga, which belonged to the species Leptonema fasciculatum Reinke. a small
brown alga of the family Elaehistaceae.
Several small algae, which most often occur epiphytically, are known
from an animal substratum too (cf. Suneson 1939), but as far as I know
algae have never been found epizoic on parasitic Copepoda, if one excepts
the fact that green algae are known covering the skin of certain species
(van Oorde-De lint & Schuurmans Stekhoven Jr 1936). Thus I find the
discovery worth mentioning in a short note.
According to Rosenvinge (1935) Leptonema fasciculatum forms small
tufts arising from a basal creeping layer. This description is valid for the
specimens on Caligus curtus too. One strong tuft with about 1 mm long and
7—8 [Ji broad threads is situated at the right margin of the cephalothorax
and near the posterior end of this (cf. fig.). In front of this tuft, still at the
margin, some more tufts are seen, but these are much smaller than the
first-named. No algae could be detected at other parts of the body of Caligus.
Leptonema fasciculatum normally lives epiphytically on Enteromorpha,
Sphacelaria racemosa, Desmürestia aculeata, Dictyosiphon, .Maria esculenta,
Laminaria digitata, Fucus vesiculosus, F. serratus, Hatidrys, Chondrus crispus,
Polysiphonia nigrescens, and other algae, as well as on Zostera marina and
Potamogeton pectinatns (Lakowitz 1929, Levring 1937, 1940, Newton 1931,
Rosenvinge 1935). Furthermore il has been observed growing on mollusc
shells (Mytilus) (Kjellman 1890, Kylin 1907, Lakowitz 1929), on
Eupagu-rus bernhardus, and on the ascidian Dendrodoa (Cynthiaj grossularia
(Rosenvinge 1935). On animals, however, it is not as common as on algae and
Zostera.
Leptonema fasciculatum occurs, in several varieties, from Greenland and
northern Norway to British waters and the southern Baltic (cf. the
above-mentioned authors), but in all localities hitherto known it seems to be rare.
Thanks to its minute size, however, it very probably has often been over-
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