66
R. H. MILLAR
Zealand lie within the same region, although the tempcrature regimes
are not identical.
Antiboreal South America
The ascidian fauna of the Patagonian Shelf, Magellan area and
Falkland Islands is by now fairly well known mainly as the result of
work by Herdman (1882, 1886), Michaelsen (1900, 1007), hnback
(1938, I050), Van Name (1945), Millar (1960) and Kott (1969). I
1 -
1 4
I
I
I
I
,
I
I
I
I
I
Fic. 23. Distribution of A, Aplidium fuegiense ; B, StyeZa pnesderi; C, Polyoa opuntia;
D, Alloeocnrpa iricruaiana ; E, Pyura legumen ; F, Paramolgula gregaria.
estimate that there are about 37 ascidian species in this fauna. The
strongest affinity is with the fauna of South Georgia, as demonstrated
by the ‘‘ Discovery ” collections in which 15 out of 24 species are also
known from that island (Miller, 1960).
The following species are either exclusively or mainly found in the
area and may be taken as characteristic of its ascidian fauna : Aplidium
fuegiense Cunningham, Styela paessleri Michaelsen, Polyzoa opuntia
Lesson, Alloeocarpa incrustam (Herdman), Pyura legumen (Lesson) and
Paramolgula pegaria (Lesson) (Fig. 23).