बलेनो galosas एवं संरचना की सजा tiyeकी वर्णन कीजिए
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Answer:
Balanoglossus : (the Ancarn or Tongue worm)
- Balanoglossus related to phylum Hemichordata .
____Introduction____
It is a marine animal which lives in U-shaped burrows in the bottom sand .it feed on organic matter ingested along with sand .it is unisexual .
fertilization is external .
Life cycle includes a tornaria larva .
power of regeneration is well marked.
___Figure of Balanoglossus___
it is worm like animal.
____External morphology of Balanoglossus __
•The body is divisible into three region:
(1)Proboscis - It appears as a tongue -like projection,hence the name ""tongue worm"".
(2)Collar - it is the muscular region which bears mouth ventrally below the proboscis stalks.
(3) Trunk - It is divisible into three region :
(a) the anterior branchiogenital region which has gill pores and gonads .The lateral region containing thr gonads are thin and flat and form genital wings.
(b)The middle hepatic region is marked externally with irregular elevation due to sacculation formed by projecting hepatic caeca of the intestine.
(c) The posterior abdominal region gradually tapers posteriorly and bears a terminal anus.