アマゾン,ネグロ河(ブラジル)で得た付着珪藻

抄録

Samples of attached diatoms were taken from the flat upper surfaces of submerged stones in the Rio Negro, a tributary of the Amazon River, at Ponta da Praia (Km 18), opposite the Tropical Hotel, Manaus, Amazonas, Brazil, on August 8,1986.
The samples were examined with a light microscope and each taxon was photographed, illustrated and measured for identification.19 taxa from 12 genera are recorded, distributed as follows; one species of genus Actinella (A. brasiliensis GRUN. ), one species of genus Anomoeoneis (A. exilis (K_ÜTZ. ) Cleve f. lanceolata A. MAYER, ) two species of genus Cymbella (C. amphicephala NAEG. and C. ventricosa K_ÜTZ. ), five taxa of genus Eunotia (E. diodon E_HR., E. lunaris (E_HR. ) GRUN., E. valida HUST,. E. fallax A. CLEVE var. gracilima KRASSKE and E. pectinalis (Dillw. ? K_ÜTZ. ) Rabenh. var. minor (K_ÜTZ. ) RABENH.), one species of Cyclotella (Cyclotella sp. ), one species of Fragilaria (F. constricta E_HR. ), two taxa of Frustulia(F. rhomboides (RABENH). D_E TONI f. saxonica and f. undulata HUST. ), (RABENH), one species of Gomphonema (G. subclavatum E_HR. ?), two species of Pinnularia (P. subcapitata GREG. and P. hemiptera RABENH. ), one species of Navicula (N. cryptotenella LANGE-BERTAL ? ), one species of Nitzschia (N. palea (K_ÜTZ. ) W. SMITH), and one species of Synedra (S. rumpens K_ÜTZ. var. scotica GRUNT. ?). Eunotia was the best represented genus in number of taxa identified, while Actinella, Cyclotella, Synedra, Fragillaria, Nitzschia, Anomoeoneis and Gomphonema were the least represented of all.