PHYLUM
ANNELIDA
GENERAL CHARACTERS :
- These are mostly aquatic animals found in freshwater and marine water.
- Some annelids are terrestrial and burrowing animals
- Body is bilaterally symmetrical elongated worm like.
- Body is elongated vermiform, bilaterally symmetrical.
- Body is metatmerically segmented
- Boy wall consists of longitudinal as well as circular musce.
- Body wall is covered by cuticle.
- These are triploblastic and coelomate animals,
- Respiration by general body surface. .
- Circulatory system is well developed and is of closed type.
- Blood is red in colour due to haemoglobin which is dissolved in plasma.
- Excretion by nephridia, locomotion by setae, parapodia or suckers.
- . The sexes are separate or united.
(Phylum annelids consists of following four
classes i.e. classes — Polycheta, Oligochaeta, Hirudenia and Archiannelida)
EARTHWORM
KINGDOM
:
ANIMALIA - Eukaryotic, Multi-cellular,
without chloroplast
SUBKINGDOM
: EUMETAZOA Diploblastic animal
PHYLUM
:
ANNEL1DA - Body is segmented
CLASS
:
OLIGOCHAETA Setae are locomotary organs
GENUS
:
PHERETIMA
SPECIES
:
POSTHUMA
·
CHARACTERS
:
- The body is long, narrow, cylindrical.
- Anterior end is pointed and posterior end is blunted.
- Body is divided into 100 to 120 ring like segments.
- Each segments is provided setae.
- Clitelum is present between 14th to 16th segments.
- Mouth is present at anterior end.
- It is hermaphrodite animal having both male and female sex organ in same individual.
- Female genital pore lies on ventral surface.
- A pair of male genital pore is situated ventrally in the 18th segment.
- Last segment bears anus
NEREIS
KINGDOM : ANIMALIA Eukaryotic, Multi-cellular, without
chloroplast
SUBKINGDOM : EUMETAZOA
PHYLUM :
ANNELIDA
CLASS :
POLYCHAETA
·
CHARACTERS:
1.
It
lives in burrows in sand or mud so it is commonly known as Rag worm of Clam
worm
2.
It
is nocturnal and carnivores.
3.
Head
bears eyes. Palps, tentacles.
4.
Lateral
parapodia are present.
5.
Clitellum is absent.
6.
Parapodia
with compound seteae.
7.
It is hermaphrodite animal.
LEECH
KINGDOM
: ANIMALIA Eukaryotic,
Multi-cellular, without chloroplast
SUBKINGDOM
: EUMETAZOA
PHYLUM
:
ANNELIDA
CLASS
: HIRUDENIA
·
CHARACTERS:
1.
It is commonly called as Indian cattle
leech found in ponds, marshes and streams.
2.
It is ectoparasitic animal.
3.
Number of body segments. 33 segments are
present in a matured leech.
4.
Each segment show superficial divisions
called annuli.
5.
Presence of suckers for locomotion and
attachment.
6.
Indistinct head with five pairs of eyes
situated dorsally in the first five segments.
7.
Animals are bisexual
8.
The male genital pore is situated mid-ventrally
in between the 10th segment.
9.
The female genital pore lies
mid-ventrally on the Ith segment.
10.
The anus lies mid-dorsally on the 26th
segment.
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