GONADS OF HERDMANIA

Written by Saturday, 08 July 2017 00:17
Herdmania is a bisexual animal. It is a protogynous animal. Ovary matures’ first. Hence cross fertilization takes place.   Herdmania contains a pair of gonads. The left gonad lies in…

ORGANISATION OF HERDMANIA TADPOLE LARVA

Written by Saturday, 08 July 2017 00:03
Herdmania is a hermaphrodite animal. The fertilised eggs undergo holoblastic unequal clevage and it develops into blastula. it shows upper micromeres and lower macromeres. By invagination of the macromeres gastrulation…

RETROGRESSIVE METAMORPHOSIS IN HERDMANIA

Written by Friday, 07 July 2017 19:47
During metamorphosis the larva will loose all the chordate characters and attains an invertebrate like form. This type of metamorphosis, where highly advanced larval form ends in a lowly organised…

HERDMANIA: SPICULES IN THE TEST

Written by Friday, 07 July 2017 19:32
In the test of Herdmania two types of calcareous spicules are Present. They are:   Microscleres: These are 40 to 80 microns in length. They are minute. Megascleres: These are…

EXCRETORY ORGAN OF HERDMANIA

Written by Friday, 07 July 2017 18:44
A neural gland is present above the brain in herdmaina. It is brown in colour. It is present in the mantle. It is 4mm in diameter. It show branching tibuIes.…

NERVOUS SYSTEM OF HERDMANIA

Written by Friday, 07 July 2017 18:29
Herdmania shows brain or nerve ganglion. It is 4 mm long. It is present in the mantle in between the two siphons. A neural gland is present above the brain.…

EXTERNAL CHARACTERS OF HERDMANIA

Written by Friday, 07 July 2017 18:09
Herdmania is a simple ascidian, In Indian ocean this genus is represented by 4 species.   1. Herdmania pallida 2. H. ennurensis 3. H. mauritiana 4. H. ceylonica   Herdmania…

AFFINITIES OF UROCHORDATES

Written by Friday, 07 July 2017 17:08
The typical tunicate looks like a non-chordate animal. If the life history of such animal is studied, the larval form reveals the chordate characters of that animal. In 1816, Lamarck…

CLASSIFICATION OF UROCHORDATA

Written by Friday, 07 July 2017 16:29
Subphylum Urochordata is divided into three classes.   CLASS 1.  ASCIDIACEA CLASS 2. THALIACEA CLASS 3. LARVACEA (APPENDICULARIA)   CLASS 1. ASCIDIACEA:   These are sedentary tunicates. The body is…

GENERAL CHARACTERS OF UROCHORDATA

Written by Thursday, 06 July 2017 23:42
The tunicates were first regarded as sponges. Lamark in 1816 placed Tunicata in between the Radiata and Vermes in his system of classification. Later, they were included in Mollusca. In…
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