Serpula

-

SERPULA



CLASSIFICATION:

Phylum: Annelida

Class: Polychaeta

Genus: Serpula


COMMENTS:

•Body of Serpula is elongated, cylindrical & vermiform, measuring 3.5 cm to 4cm in length.

•Elongated body has a head, thorax & abdomen.

•The anterior end forms the head consisting of prostomium & peristomium.

•Prostomium is provided with a pair of semi-circular feathered gills which are modified palps.

•Peristomium is produced into a collar which folds backwards.

•Thoracic membrane present on each side is formed by fusion of the dorsal and ventral cirri of the thoracic segments.

•Operculum is formed by the terminal enlargement of one of the dorsal gills fillaments. Operculum serves to close the opening of the tube.

•The gills are modified palps, sometimes supported by cartilagenous segments and are richly supplied with blood.

•Each gills consists of an elongated branch having two rows of short filaments.

•Gills serve as respiratory & food collecting organs.











Comments

Post a Comment

Popular posts from this blog

Peripatus

-
Image
PERIPATUS CLASSIFICATION: PHYLUM:  ONYCHOPHORA (contain annelida & arthropoda character). COMMENTS: •It is referred as " living fossil". • Body of the animal is cylindrical & elongated caterpillar like & measuring 4-6 cm in length. •Outer covering of the body is thin,velvety, chitinous showing transverse, wrinkles, numerous small papillae or tubercles. •Anterior end is marked by pre-antennae & ventral mouth & posterior end by anus. •There is a head of three segments. •Post-oral segment of the head bear pair of hooked jaws, a pair of oral papillae, a pair of simple eyes & a pair of segmented antennae. • There are about 15 pairs of walking legs, •There is a tracheal system for respiration with spiracles scattered irregularly over the body surface. •Crural gland is absent & genital pore is posterior. •Connecting link between arthropoda & annelida.
Read more

Bombyx

-
Image
  BOMBYX CLASSIFICATION : PHYLUM ARTHROPODA (Jointed appendage). SUB-PHYLUM UNIRAMIA (single branch appendage). CLASS: INSECTA ( 3 pair of legs ). COMMENTS: • Bombyx is commonly called as silk moth. • Body consists of head, thorax & abdomen. •Head bears a pair of antennae & a pair of compound eyes. •Thorax bears three pairs of legs and two pairs of rings which are covered with scales. • Hindwings are smaller than forewings. • Abdomen consists of 10 segments. •Mouth parts of siphoning type. •Moths are nocturnal,they come in the night during rainy season. •Various stages of life cycle are egg, larva, pupa, adult male & female •Larva feeds mulberry leaves by its mandibles & mouth parts & undergoes moulting as it grows. • Habit & Habitat: They are reared for silk. Adults have short life span & do not feed. • Distribution : cosmopolitan.
Read more

Balanus

-
Image
BALANUS   CLASSIFICATION : PHYLUM:  ARTHROPODA (Jointed appendages) SUB-PHYLUM: CRUSTACEA (Biramous appendages) CLASS: CERRIPEDIA (Adults sessile /parasitic) COMMENTS: •Commonly called as Rock Barnacle. •Stalk is absent to the shell covering animal is directly attached to the substratum or rocks. •Head is short & broad. • Mantle surrounding the body is covered six calcareous plates, consisting of unpaired carina, rostrum & 2 pairs of carino-lateral plates. Edges of the plates overlap & fit together forming a cylinder. • opening of the shell is provided with a movable fourfold lid or operculum, composed of 2 scuta or 2 terga. •In water, the barnacle protrudes through the opening six pairs of delicate, curled, fringed & jointed thoracic legs to collect food. • Life cycle includes nauplius larva. •Distribution: It has cosmopolitan distribution.
Read more