STERNASPIS

CLASSIFICATION OF STERNASPIS

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 :- Sternaspis

GEOGRAPHICAL DISTRIBUTION

  • It is found in U.S.A. (Florida).

HABIT AND HABITAT

  • Sternaspis is a marine, tubicolous polychaete

STERNASPIS

GENERAL CHARACTERSTICS OF STERNASPIS​

  • Body is short and made up of about 30 segments. 
  • Head is formed by prostomium and peristomium. 
  • Prostomium is elongated and without any appendages.
  • Peristomium is knob like and contains mouth. 
  • First three segments have incomplete bristles, segments 8 to 15 have setae while segments 5th, 6th, 7th and 16th to 24th are devoid of setae. 
  • Just below 7th segment is a pair of genital papilla.
  • In Sternaspis spinosa, the prostomium is elongated and bifurcated like the proboscis of the Echiurida. 
  • Intestine is coiled and the anus is terminal and surrounded by gills. 
  • Below 7th segment body is durable shaped and posteriorly a cuticular thickening is present ventrally called as ventral shield. Ventral shield contains number of setae around its edge.
STERNASPIS

IDENTIFICATION

  • The animal has bifurcated proboscis like prostomium and all above features hence it is Sternaspis.

STERNASPIS
STERNASPIS
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