MAGELLANIA

CLASSIFICATION OF MAGELLANIA

PHYLUM :-  BRACHIOPODA  (Lophophore contains coiled arms).

CLASS :- ARTICULATA (Shell valves articulate by hinge).

ORDER :- TEREBRATULIDA

FAMILY :-TEREBRATELLIDAE 

Genus : Magellania

SPECIES :- tenticullaria

HABIT AND HABITAT

  • Magellania is exclusively a marine animal, preferably in cool waters and abundantly found in Japan, Southern Australia, the Mediterranean. Arctic and Antarctic. These sedentary forms are never found in colonies.

MAGELLANIA DIAGRAM BRACHIOPODA

GENERAL CHARACTERSTICS OF MAGELLANIA

  • Animal comprises of two unequal pinkish shell valves.
  • Body is enclosed by unequal bivalve dorsal and ventral shell valves. 
  • Posteriorly the ventral shell projects as a conical beak perforated by an aperture through which fleshy peduncle extends and attaches permanently to the bottom of the sea.
  • Shell in dorsal view reveals lines of growth, hinge line, deltidium, foramen, beak and part of ventral shell.
  • W-shaped lophophore between mantle lobes is supported by slimy calcareous shell loop. Lophophore has long ciliated tentacles for the capture of the prey. 
  • Blood vascular system is poorly developed and consists of a dorsal longitudinal vessel within dorsal heart from which vessels radiate to end blindly.
  • Nephridia lie on either side of the intestine, and they open into coelom by nephrostome. Nephridia act as gonoducts.
  • Nervous system comprises of a gonglionated circum-oesophageal ring from which peripheral nerves arise. 
  • Sexes are separate. The gonadial products are discharged through the excretory ducts (gonoducts).
  • The larva resembles somewhat to trochophore.
MAGELLANIA BRACHIOPODA

SPECIAL FEATURES

  • Brachiopods, have long fossil history. They resemble with molluscs but differs from molluscs in having unequal shells and lophophore.

IDENTIFICATION

  • has beak in ventral shell valve and all above feature, hence it is Magellania.

REFERENCES :-

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