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Related FAQs; Flatworms/Planaria 1, Flatworms 2Flatworms 3, & FAQs on: Flatworm Identification, Flatworm ID 2, Flatworm ID 3, Flatworm Behavior, Flatworm Compatibility, Flatworm Control, Predator Control, Chemical Control, Flatworm Selection, Flatworm Systems, Flatworm Feeding, Flatworm Disease, Flatworm Reproduction,

Related Articles: Pest Flatworm Control by Anthony Calfo, Worm DiversityThe Flatworms That Are Flukes by Bob Fenner

/The Conscientious Reef Aquarist:

Flatworms, including "Planaria" & Marine Aquariums, Part 1

To: Part 1, Part 3,

By Bob Fenner

Pseudoceros dimidiatus

Genus Pseudobiceros:

Pseudobiceros bedfordi (Laidlaw 1903). Amongst the more commonly encountered Indo-Pacific (East Africa to Micronesia) Flatworms. Feeds on tunicates, crustaceans. Fast moving. N. Sulawesi image. 

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Pseudobiceros fulgor. Here in S. Sulawesi.

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Pseudobiceros gloriosus Newman & Cannon 1994. Black velvet bodied with three marginal bands, outer dark burgundy. Melanesia, Australia, Fiji. N. Sulawesi image. 

Pseudobiceros hancockanus (Collingwood 1876). Highly undulated body margin with white and orange bands. To six inches in length. Indo-Pacific; Maldives to Fiji, Australia, Japan. Off Heron Island, QLD, Australia, and Nuka Hiva, Marquesas, Polynesia. 

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Pseudobiceros sp. "#8". Raja Ampat 08

Pseudobiceros sp. Here in S. Sulawesi.

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Genus Pseudoceros:

Pseudoceros bifurcus Prudhoe 1989. Eastern Africa to Indonesia, Australia, Philippines. Pseudotentacles as simple folds. Distinctive white mid-line stripe that is orange at the anterior of the animal. To a bit over two inches in length. Off of Heron Island shown feeding on tunicates, another in N. Sulawesi. 

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Pseudoceros contrarius Neman & Cannon1995. Creamy body with yellow line down the middle. Dual color banding around perimeter... Yellow/orange and blue/black. New Guinea... This one Raja Ampat 08.

Pseudoceros dimidiatus von Graff 1893. Look for the double yellow "racing stripe" down the middle for this species. Other markings are variable to missing.  Central to western Pacific. One off of Kailua Kona, Hawai'i by RMF, another in PNG by PhilS. 

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Pseudoceros ferrugineus Hyman 1959. The Fuchsia Flatworm Central and Western Pacific at moderate depths. Out during both day and night, often appearing bluish until artificial light is applied, and more round when fully opened. Hawaii pix. 

Pseudoceros gravieri N. Sulawesi.

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Pseudoceros lindae. Here in S. Sulawesi.

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Pseudoceros monostichos Newman & Cannon, 1994. New Guinea and Australia. Phil Sokol pic in PNG.

Pseudoceros pardalis Leopard Flatworm. Red-Brown with orange dots and whitish spots. Curacao 2015, TiffB pic.

Pseudoceros sapphrinus Newman & Cannon 1994. Western Pacific; eastern Australia, Philippines, Marshall Islands. This one photographed in Fiji. Often encountered (day and night) crawling over Acroporids. 


Unknown Presumed Pseudoceros spp.
Pseudoceros sp. Mabul, Malaysia and North Sulawesi. Black marginal stripe, undulated margin...

Pseudoceros sp. 2. Raja Ampat 08.

Pseudoceros sp. 4 Here in S. Sulawesi.


Pseudoceros sp. 4 unknown/undescribed species numbering according to 2011 Humann and DeLoach guide. S. Leyte, P.I. 2013

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Pseudoceros sp. 5 Here in S. Sulawesi.


Pseudoceros sp. in S. Leyte 2013.

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To: Part 1, Part 3,

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