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Systematics

Arabella iricolor (Montagu,1804) Annelida(Phylum) > Polychaeta (Class) >   Eunicida (Order)  > Oenonidae (Family) > Arabella (Genus)

Description

95mm long, 5mm width, dark brown with vertical black stripe. Segmented body parts with parapodia.

Inhabits under the rocks mainly in foreshore area. Marine only, feed on algae, carrion and other worms.

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Fig 1: Close view of head, parapodia and tail. Fig 2: Contrast sketch referred from IndoPacific After Day (1967).Fig 3: General body diagram.

Han Mu & Wang Haotian

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Systematics

Branchiomma cingulata (Grube,1780)  Annelida (Phylum) > Polychaeta (Class) > Sabellida (Order) > Sabellidae (Family) > Branchiomma (Genus)

Description

25mm length, 4mm width with a flower-shaped coronary hat in the fore part. Red-brown colored body, whereas the hat is gray and a bit transparent as a function of filtration. And it can use tentacles to hunt its prey. There are 8 parapodias on the chest part.(Fig 1) The hat part is very sensitive that it can immediately compress and back into the chest if it is scared.

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Fig 1: Close view of the coronary hat and parapodia.Fig 2: General outlookFig 3: Several branchiomma cingulatas parasitized on the surface of ascidean.

Han Mu & Wang Haotian

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Coronary hat

Host ascidean

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Systematics

Lepidonotus tenuisetosus (Gravier,1902)  Annelida (Phylum) > Polychaeta (Class) >   Phyllodocida (Order) > Polynoidae (Family) > Lepidonotus (Genus)

Description

12mm of length, width 4mm. The dorsal side is light brown, with many large dark patterns which we can use to distinguish it from other polychaeta. The ventral side is light pink, nearly transparent. There is an obvious blood vessel go through the whole body vertically. Parapodias and chaeta also exist.

We found it in under a rock twisted with some sponge, with Arabella iricolor and other four Phascolosoma Scolops.

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Fig 1: Dorsal side of the Lepidonotus tenuisetosus Fig 2: Ventral side

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Dorsal side

Ventral side

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Systematics

Opisthosyllis longicirrata Monro, 1939 

Annelida (Phylum) > Polychaeta (Class) > > Phyllodocida (Order) > Syllidae (Family) > Opisthosyllis (Genus)

Description

28mm length, 1mm width, light green body, found on the surface of ascidean. With transparent parapodia and chaeta on two sides, black eyes with tentacles in anterior part. Two obvious branch of tentacles is one character of this species and the body is very flexible.

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Fig 1: General outlookFig 2: Anterior part of Opisthosyllis longicirrata Monro

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Systematics

Stylochoplana pusilla (Bock, 1924) Platyhelminthes (Phylum) > Rhabditophora (Class) > Polycladida (Order) > Acotylea (Suborder) > Leptoplanoidea (Superfamily) > Stylochoplanidae (Family) > Stylochoplana (Genus)

Description

It is 3.5mm long, with a milky-yellow smooth body. Parasitize usually in sea snails. Chiton can also have large, white-colored parasitic flatworms. As it has gastro vascular cavity, which means only one opening for both digesting and circulation,(as we can see the dark line in the middle of the body) besides, there are eyes on the back. The body shape varies significantly during peristalsis.

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Fig 1: Stylochoplana pusilla in compress state.Fig 2: Host: Sea snail.Fig 3: Stylochoplana pusilla in extending state.

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Host sea snailA pair of eyes

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Systematics

Nemertopsis gracilis var. bullocki Nemertea (Phylum) > Enopla (Class) > Hoplonemertea (Subclass) > Monostilifera (Order) > Emplectonematidae (Family) > Nemertopsis (Genus) 

Description

100mm length. 0.7mm width. Light yellow body. Two long dark brown lines can be observed in the dorsal side. There also two black eyes in the middle of the lines. Unsegmented body plan.

It was found in a big rock which was dig in the sea shore. These species always live as parasite in the barnacle. But this one was escaped from the barnacle and fortunately we found it.

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Fig 1 General outlookFig 2 Close view of anterior part

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Systematics

Euchromadora tokiokai Nematoda (Phylum) > Adenophorea (Class) > Chromadorida (Order) > Chromadoridae (Family) > Euchromadora (Genus)

Description

1.4mm length, found on algae, white body with stripes. Interior appears to be green which may caused by undigested algae.

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Fig 1: General outlookFig 2: Close view of anterior part.

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Intestine and guts

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Systematics

Phascolosoma scolops (Selenka & de Man, 1883) Sipuncula (Phylum) > Phascolosomatidea (Class) > Phascolosomatida (Order) > Phascolosomatidae (Family) > Phascolosoma (Genus) 

Description12mm long, 5mm width, smooth light pink unsegmented body. It is born in the crevice of rocks. There are tentacles around the tip connected to the introvert, and yellow brown spot can be found on the dorsal side.

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Fig 1: General body view.

Fig 2: Close view of forepart (Spots, introvert & tentacles).

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