DAVEY, DOWNIE, SARJEANT & WILLIAMS (1966) 



45 



SURCULOSPHAERIDIUM continued 

 longifurcatum (Firtion, 1952) Davey et al., 



1966 

 vestitum (Deflandre, 1938) Davey et al., 1966 



SYSTEMATOPHORA Klement, i960 

 areolata Klement, i960 

 placacantha (Deflandre & Cookson, 1955) 



Davey et al., 1966; emend. May, 1980 

 schindewolfi (Alberti, 1961) Downie & Sar- 

 jeant, 1965 



TANYOSPHAERIDIUM Davey & 



Williams, 1966b 

 ellipticum (Cookson, 1965) Davey & 



Williams, 1969 

 isocalamum (Deflandre & Cookson, 1955) 



Davey & Williams, 1969 

 regulare Davey & Williams, 1966b 

 variecalamum Davey & Williams, 1966b 



THALASSIPHORA Eisenack & Gocht, i960; 

 emend. Gocht, 1968 

 delicata Williams & Downie, 1966c; emend. 



Eaton, 1976 

 pelagica (Eisenack, 1954) Eisenach & Gocht, 

 i960 



WANAEA Cookson & Eisenack, 1958; emend. 

 Fensome, 1981 

 spectabilis (Deflandre & Cookson, 1955) 

 Cookson & Eisenack, 1958 



WETZELIELLA Eisenack, 1938; emend. 

 Williams & Downie, 1966b; emend. Lentin 

 & Williams, 1976 



articulata Eisenack, 1938 

 articulata var. conopia Williams & Downie, 

 1966b 



clathrata Eisenack, 1938 



coleothrypta Williams & Downie, 1966b 



condylos Williams & Downie, 1966b 



homomorpha Deflandre & Cookson, 1955 



homomorpha var. quinquelata Williams & 



Downie, 1966b 

 ovalis Eisenack, 1954 



Hystrichosphaerina schindewolfii Alberti, 1961. 

 [The genus Hystrichosphaerina, rejected 

 as a.jr syn. of Systematophora by Neale & 

 Sarjeant (1962), was reinstated under an 

 emended definition by Stover & Evitt, 

 1978.] 



Distatodinium ellipticum (Cookson, 1965) 

 Eaton, 1976 



[Since the other constituent subgenera have 

 either been raised to generic status or 

 abandoned, the type subgenus Wetzeliella 

 has now fallen into disuse.] 



Kisselovia tenuivirgula subsp. conopia 



(Williams & Downie, 1966b) Costa & 



Downie, 1979 

 Kisselovia? clathrata (Eisenack, 1938) Lentin 



& Williams, 1976 

 Kisselovia coleothrypta (Williams & Downie, 



1966b) Lentin & Williams, 1976 

 Dracodinium condylos (Williams & Downie, 



1966b) Costa & Downie, 1979 

 Apectodinium homomorphum (Deflandre & 



Cookson, 1955) Lentin & Williams, 1977; 



emend. Harland, 1979 

 Apectodinium quinquelatum (Williams & 



Downie, 1966b) Costa & Downie, 1979 



