Chromosomes in opalinidae (protozoa, ciliata) with special reference to their behavior, morphology, individuality, diploidy, haploidy, and association with nucleoli

Further Cytological Studies in the Genus Penicillium Link

“…An intranuclear spindle may be found, or it may be extremely reduced as in Aggregritri eberti. Forms of mitosis in the Protisfn may be compared with those in diploid Cilicitcc (CHEN, 1948;RAY, 1956) and with numerous flagellates (CLEVELAND, 1949).…”

Opalinidae in African Anura. IV. Genus Protoopalina

“…Chen (1948) pointed out that nucleoli have in the past been mistaken for chromosomes. The real chromosome number is unknown for any of those species (Chen, 1948).…”

“…Chen (1948) pointed out that nucleoli have in the past been mistaken for chromosomes. The real chromosome number is unknown for any of those species (Chen, 1948). Metcalf, 1923 Resembles somewhat P. tenuis and P. filiformis, (Metcalf, 1923).…”

Opalinidae (Sarcomastigophora) in North American Amphibia. GenusProtoopalina Metcalf, 1918

“…The only differences he noticed between the two species were in the form and number of chromosomes. As Chen (1948) suggested, Metcalf mistook nucleoli for chromosomes. We also propose to consider P. scaphiopodos as a junior synonym of P. mitotica.…”

“…The number of chromosomes, as listed by Metcalf (1923) in his descriptions of new species, has been discarded as a taxonomic criterion since, as pointed out by Chen (1948), nucleoli have in the past been mistaken for chromosomes.…”