Corallinales (Rhodophyta) in Tierra del Fuego are abundant, with 9 genera,
17 species and 1 subspecies. Pseudolithophyllum with 1 species (P, fueguian
um), which represents 35.8% of the coralline algae, is dominant. The genera
Parahydrolithon with 4 species (P. consociatum, P. discoideum, P. falkland
icum, P. subantarcticum) and 20%, Lithothamnion with 3 species (Lt. heteroc
ladum, Lt. rugosum, Lt. granuliferum) and 17.5%, and Synarthrophyton with 3
species (S. neglectum, S. patena, S. schmitzii) and 12% share an abundant.
Clathromorphum with 4 species (Cl. annulatum, Cl. lemoineanum, Cl. obtectu
lum, Cl. variabile) and a share of 5.8%, and Mesophyllum with 1 species (M.
fueguianum) and a share of 4.9% are frequent. The remaining three genera,
Bossiella with 1 subspecies (B. orbigniana ssp. orbigniana), Corallina with
2 species (C. elongata, C. officinalis) (1.1%), and Titanoderna with 1 spe
cies (T. conspectum) (1%) are scarce. C. officinalis is a cosmopolitan, and
the other geniculate corallines are found in both hemispheres, whereas the
crustose coralline occur only in the southern hemisphere. The characterist
ic vertical distribution of the species in the intertidal and subtidal zone
of Tierra del Fuego is given. The Corallinales in the Antarctic Region are
poorly known and need further investigation.