Species Profile
Hydra
Freshwater polyp
KingdomAnimalia
PhylumCoelenterata
ClassHydrozoa
OrderUnknown
FamilyUnknown
Introduction
Hydra lives in freshwater ponds and streams.
It is sedentary and carnivorous.
Important in developmental biology.
Size & Structure
01
Very small and cylindrical
02
Tentacles around mouth
03
Green or brown colour
04
Basal disc for attachment
Hydra — 3D Model
General Features
- Coelom
- Acoelomate
- Body plan
- Blind sac body plan
- Germ layer
- Diploblastic
- Metamerism
- Absent
- Body symmetry
- Radial
- Fertilization
- External
- Digestion type
- Incomplete, extracellular and intracellular
- Nervous system
- Nerve net
- Excretory organ
- Absent
- Body temperature
- Poikilothermic, stenohaline
- Circulatory type
- Type-I (absent)
- Development type
- Indirect
- Respiratory type
- Diffusion
- Mode of excretion
- Ammonotelism
- Circulation system
- Gastrovascular
- Skeleton structure
- Absent
- Level of Organisation
- Tissue level
- Regulation of Osmosis
- Osmoconformer
Ecology
Predator of small aquatic animals
Controls plankton population
Part of freshwater food web
Economic Importance
Model organism in research
Used in regeneration studies
Educational importance