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(5)Aschelminthes
This is a heterogenous phylum, of unsegmented or superficially
segmented, free-living or parasitic animals. The main group, Nematoda,
comprises the round worms which, as the name suggests, are cylindrical.
The Kinorhyncha are minute, spiny 13-14 segmented forms found at the
bottom of shallow seas. The Priapulida are also represented in the seas.
Here the body has a distinet trunk with a proboscis which can be everted.
In the Nematomorpha the body is long, thread-like and irregularly coiled
when at rest. The Rotifera are mainly freshwater animals, but a few marine
forms occur. Some are parasitic.
(6)Entoprocta and Ectoprocta
These two minor phyla, previously grouped together under Bryozoa or
Polyzoa, are mostly marine and colonial forms, commonly known as seamats
or sea-mosses, and resemble Hydroid zoophytes. While in the
Endoprocta both the mouth and the anus are within the lophophore, in the
Ectoprocta the latter lies outside. Majority of the forms are found in the
seashore region, as extensive growths on stones, inside seashells, or as
encrustations on boat hulls ; their occurrence has been recorded as deep as
3000 fathoms.
Phylum ENTOPROCTA Family Pedicellinidae Genus Pedicellina Sars
Pedicellina cernua(Pallas)
Genus Barentsia Hincks
Barentsia gracilis(Sars)
Phylum ECTOPROCTA
Class Gymnolaemata
Order Ctenostomata
Suborder Stolonifera
Family Vesiculariidae
Genus Amathia Lamouroux
Amathia convolutaLamouroux
GenusBowerbankiaFarre
FAUNA 180