Family Orbiniidae

Orbiniidae (Click to enlarge)

Orbiniidae (collected from Victoria Habour).  Entire worm.

Orbiniidae (Click to enlarge)

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Orbiniidae (Click to enlarge)
Orbiniidae (collected from Victoria Habour).  Ventral view of anterior region. Orbiniidae (Click to enlarge)

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Orbiniidae (Click to enlarge)
Orbiniidae (collected from Victoria Habour).   Dorsal view of anterior region. Orbiniidae (Click to enlarge)

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Orbiniidae (Click to enlarge)
Orbiniidae (collected from Victoria Habour). Dorsolateral view of anterior region. Orbiniidae (Click to enlarge)

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Orbiniidae (Click to enlarge)

Orbiniidae (collected from Victoria Habour).  Posterior region.

Orbiniidae (Click to enlarge)

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Orbiniidae (Click to enlarge)

Orbiniidae (collected from Tathong Channel).  Entire worm.

Orbiniidae (Click to enlarge)

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Orbiniidae
Orbiniidae (collected from Tathong Channel).  Anterior region.

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Setae of Orbiniidae (Click to enlarge)
Setae at anterior region of Orbiniidae. Setae of Orbiniidae (Click to enlarge)
Setae of Orbiniidae (Click to enlarge)
Setae at abdominal region of Orbiniidae. Setae of Orbiniidae (Click to enlarge)

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Order Orbiniida
Family Orbiniidae

Features
Body: long and thread-like; divided into 2 regions - thoracic region with lateral parapodia and abdominal region with dosal parapodia
Prostomium: conical and no appendage; with 1 or 2 asetigerous anterior segments
Peristomium: no appendage
Eye: absent or 2
Antennae: absent
Cirri: absent
Palp: absent
Pharynx: eversible and sac-like
Parapodium: biramous
Setea: simple including capillaries, simple hooks brush-topped, bifid or furcate setae
Anal cirri: 4
(Fauchald 1977)

Biological Notes
        Orbiniids burrow in sandy mud and ingest particulate organic matters.   They do not make permanent tubes.   The pointed prostomium and flattened, muscular anterior region are for burrowing.    The respiratory and digestive gills are protected by the whole dorsal parapodium.   Some orbiniids with rounded prostomia such as Naineris and Proscoloplos can be found on rocky shores among the holdfasts of algae (Day 1967).

        Scoloplos tumidus is a new species reported from Hong Kong (Mackie 1991).   It was found in the intertidal sand at Sai Keng, Three Fathoms Cove and Tolo Channel in 1986 and 1989.


Genera and Species Reported in Hong Kong

Leitoscoloplos kerguenlensis
Orbinia
sp.
Phylo kupfferi
Scoloplos tumidus*

* new species

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