CLASSIFICATION OF ARENICOLA

PHYLUM :- ANNELIDA (Metamerically segmented, coelomate and laterally symmetrical. )

CLASS :- POLYCHAETA (Many setae, clitellum absent. )

ORDER :- SEDENTARIA  (Tubicolous, sedentary and proboscis not-protrusible, without jaws or teeth.)

GENUS :- Arenicola (The Lug worm)

GEOGRAPHICAL DISTRIBUTION

  • It is distributed in Europe and U.S.A. (Florida to Cape Cod)

HABIT AND HABITAT

  • Arenicola is also tubiculous and burrowing polychaete, occurring just below the tide line in sea, where the water is less saline. Animals lives in a J-shaped burrow made of sand and mucus.

ARENICOLA

GENERAL CHARACTERSTICS OF ARENICOLA​

  • Body is stout, elongated, cylindrical and approximately 15 cm long, brownish or greenish in colour and divided into metameres.
  • Head without appendages and with an unarmed proboscis. 
  • Animal is differentiated into an anterior pre-branchial, a middle branchial and a posterior post-branchial region. 
  • Anterior region consists of a small trilobed prostomium with no eyes or tentacles, an achaetus peristomium and 6 segments bearing rudimentary parapodia. 
  • Parapodia contains reduced notopodium and neuropodium.
  • Mouth lies ventral to the prostomium. The buccal region and pharynx protrude as proboscis which is covered by chitinized buccal papillae. 
  • Middle region has 13 segments, each bearing in addition to neuropodia, a pair of extensively branched gills. Nephridia six pairs. 
  • Posterior region has variable number of segments and devoid of parapodia or gills. Anus opens through last segment. 
  • Arenicola is generally used as bait for fishing.
ARENICOLA

IDENTIFICATION

  • The animal pre-branchial, branchial and post-branchial regions and all above features, hence it is Arenicola.

ARENICOLA
ARENICOLA
OUR POSTS

1 thought on “ARENICOLA”

  1. Pingback: PHYLUM ANNELIDA | FAUNAFONDNESS | 2021

Leave a Comment

Your email address will not be published. Required fields are marked *