428 



BIOLOGY OF THE SEAS OF THE U.S.S.R. 



Fig. 20/. JJisinouuon of anchovy and Sarda roe in northeastern corner of Black 

 Sea in May 1939 (Maljatzky). 



Z. nana (Z. minor) — are of importance in the vegetation of the Black Sea. 

 Among the Black Sea sea-weeds the dominant forms are : Phyllophora nervosa, 

 Cystoseira barbata and C.b. var. placida. 



Among the green algae the most important are Chaetomorpha chlorotica, 

 Enteromorpha intestinalis, some species of Cladophora and Ulva lactuca; 

 among the brown ones Cystoseira barbata with its variant placida and Scyto- 

 siphon lamentarius (in winter); and among the red ones Phyllophora rubens 

 var. nervosa, Ceramium rubrum and С diaphanum, Polysiphonia subulifera, P. 

 variegata, P. elongata, P. opaca and Laurencia obtusa. 



It is quite remarkable that in contrast to the animals, the bottom-living 

 algae of the Black Sea have not evolved a single endemic autochthonous form : 



Table 174 



Group 



Mediterranean 



Sea: 



Bay of Naples 



(Funck) 



Black Sea 



(Voronichin and Zinova, from 



Morozova-Wodjanitzkaja) 



Sea of Azov, excluding 



the Kerch Strait 



(L. Volkov) 



No. of 



species, per 



cent of 



No. of 



species, per 



cent of 



