Cladocera:
Kingdom: Animelia
Phylum: Arthropoda
Sub-phylum: Crustacea
Class: Branchiopoda
Order: phyllopoda
Sub-order: Anomopoda
Onvchopoda
Haplopoda
Characters:
The
Cladocera are an order of small crustacians commonly called as water
fleas.
They firstly
appaer in the Oligocene periods and invented most fresh habitate.
Most are 0.2
to 0.60 mm (0.01 to 0.24 inch).
Long with a
down turn period with a single median compound eye.
REPRODUCTION:
Reproduction is parthinogenic during the
greater part of year, in most habitates only female young are produce.
Undergo
single maturation division in ovary and the number are release at time oviduct
to brood chamber.
Number of eggs per clutch varies considerably, usually there between 2 to 40 and most frequently between 10 to 20.
The
Parthenogenetic egg under go further development in the brood chamber and hatch
into then young similar to adult.
Saesonal Abendance:
In early
spring few Cladocerians are to be found in lakes and ponds. As the water
reaches 6 to 12 C reproduction active subsequently speed up tremendous so that
large population resulting exceptional species are high as 200 to 500
individuals per liter of water.
In some
D.plexus is Monocyclic in some cold lake
Daphnia acyclic (Absence of Breed).
Reproduction of Male:
1. Number of
male beings to appear in ponds in the spring.
2. Sometimes
only 5% of the population may consist of males.
3. Sometimes more
than half are males.
4. Production
of male eggs seems to be induce mostly by crowding of them females and the sub
sequent accumulation of excretory product decrease in available food.
5. A water temperature
14 to 17 C.
6. Insome
condition responsible for men reproduction continues for longer time appear to
induce the appearance of sexual egg.