A study of the fine structure and the mitosis of a lamellicristate amoeba,Micronuclearia podoventralis gen. et sp nov (Nucleariidae, Rotosphaerida)

Citation
Ka. Mikrjukov et Ap. Mylnikov, A study of the fine structure and the mitosis of a lamellicristate amoeba,Micronuclearia podoventralis gen. et sp nov (Nucleariidae, Rotosphaerida), EUR J PROT, 37(1), 2001, pp. 15-24
Citations number
68
Categorie Soggetti
Biology
Journal title
EUROPEAN JOURNAL OF PROTISTOLOGY
ISSN journal
09324739 → ACNP
Volume
37
Issue
1
Year of publication
2001
Pages
15 - 24
Database
ISI
SICI code
0932-4739(200105)37:1<15:ASOTFS>2.0.ZU;2-7
Abstract
A study of the fine structure and the mitosis of a new member of the naked filose amoebae (Nucleariiadae, Rotosphaerida), Micronuclearia podoventralis is performed. The amoeba has a single large dictyosome adjoining to the nu cleus, 2-4 spherical mitochondria with lamellate cristae, its cell membrane is supported by a thin proteinous pseudopellicle. M. podoventralis has nor mally a single branching filopodium or 2-4 smaller ones with bases that lie close to each other. The bases of the filopodia arise from the middle of a shallow depression, the curved edge of which is supported by a mucopolysac charide layer under the plasma membrane and by a thin cuticle over it. The mitosis of M. podoventralis occurs as an open orthomitosis, but the microtu bules appear inside the nucleus at prophase before dissolution of the nucle ar envelope and before disaggregation of the nucleolus. The nuclear envelop e has broken down by metaphase by which time sister dictyosomes are found a t the poles of the spindle. The phylogenetic source of the lamellicristate sarcodines is discussed.