Monogonont
Polyarthra
The Monogononta are a subclass of rotifers ( Rotifera, Rotifera ). They live mainly planktonic and move on with well-developed organs wheels. Named giving characteristic of the group is their only gonad. The Monogononta have two multinucleated Fußdrüsen.
Reproduction
They make a generational change by, in which lay a amiktische, parthenogenetic females generation, the diploid eggs with two complete sets of chromosomes and only one polar body, and a miktische female generation, lay haploid eggs with only one set of chromosomes and two polar bodies alternate. The fertilized haploid eggs hatch amiktische females from unfertilized males, which are usually smaller than females, and usually only have an incomplete bowel function without. If a favorable biotope repopulated or change the conditions of life for the better, so the females can reproduce parthenogenetically for rapid colonization over several generations.
Inside systematics
- Superorder Gnesiotrocha, many sessile in a burrow dwelling species, other planktonic Order Collothecida Harring, 1913
- Order Flosculariida Harring, 1913
- Order Ploima Hudson & Gosse, 1886 Family Asciaporrectidae
- Family Asplanchnidae
- Family Birgeidae
- Family Brachionidae
- Family Clariaidae
- Family Conochilidae
- Family Cotylegaleatidae
- Family Dicranophoridae
- Family Epiphanidae
- Family Euchlanidae
- Family Gastropodidae
- Family Ituridae
- Family Lecanidae
- Family Lepadellidae
- Family Lindiidae
- Family Microcodidae
- Family Mytilinidae
- Family Notommatidae
- Family Proalidae
- Family Scaridiidae
- Family Synchaetidae
- Family Testudinellidae
- Family Tetrasiphonidae
- Family Trichocercidae
- Family Trichotriidae
- Family Trochosphaeridae
Representative example Trichocerca.