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Related FAQs: Marine Crabs 1, Marine Crabs 2Marine Crabs 3Marine Crabs 4, By Species/Group:  Arrow CrabsEmerald Green Crabs, Decorator Crabs/Sponge Crabs, Fiddler Crabs, Pom Pom Crabs, Sally Lightfoots, & FAQs on: Marine Crab Identification, Crab Identification 1, Crab Identification 2, Crab ID 3, SW Crab ID 4, SW Crab ID 5, SW Crab ID 6, SW Crab ID 7, SW Crab ID 8, SW Crab ID 9, Marine Crab ID 10, Marine Crab ID 11, Marine Crab ID 12, SW Crab ID 13, SW Crab ID 14, SW Crab ID 15, SW Crab ID 16, SW Crab ID 17, SW Crab ID 19, SW Crab ID 20, SW Crab ID 21, SW Crab ID 22, & Crab Behavior, Marine Crab Selection, Marine Crab Compatibility, Marine Crab Compatibility 2, Marine Crab Compatibility 3, Marine Crab Systems, Marine Crab Feeding, Marine Crab Reproduction, Marine Crab Disease, Micro-Crustaceans, Amphipods, Copepods, Mysids, Hermit Crabs, Shrimps, Cleaner Shrimps, Banded Coral Shrimp, Mantis Shrimp, Anemone Eating ShrimpArrow CrabsEmerald Green, Mithrax/Mithraculus Crabs, Crustacean Identification, Crustacean Selection, Crustacean Behavior, Crustacean Compatibility, Crustacean Systems, Crustacean Feeding, Crustacean Disease, Crustacean Reproduction,  

Related Articles: Hermit Crabs, Squat Lobsters, Crustaceans, Fiddler Crabs, Arrow Crabs, Algae ControlNutrient Control and Export

/A Diversity of Aquatic Life  

Crabs For Marine Aquariums?
Part
2

To: Part 1, Part 3,

 Bob Fenner

Boxing... Lybia

Family Majidae; the Spider or Decorator Crabs (includes Mithrax Crabs)

Achaeus (Oncinopus?) japonicus Haan 1839, the Orangutan Crab. Bodies have long processes that the crab attaches algae et al. for camouflage/protection. Usually found in association with cnidarians: Plerogyra, Dendronephthya, Parazoanthus... N. Sulawesi pix on Bubble and Euphyllia Corals. 

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Composcia retusa. Decorator crab. Indo-Pacific; Red Sea to Japan. N. Sulawesi (Lembeh Strait) pic. To 4 cm. carapace width. Stick hydroids, sponges, algae on their shells. 

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Unknown Cyclocoeloma sp. On a sea whip in N. Sulawesi... Bizarre looking. 

Huenia heraldica Haan 1837, the Arrowhead or Caulerpa Crab. Indo-Central Pacific; South Africa, India, Australia, Indonesia to Hawai'i. Here carrying a big of algae in N. Sulawesi. 

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Hyastenus bispinosus Buitendijk 1939. Indonesia and Fiji. Small decorator crab, usually utilizing hydroids and detritus for camouflage. N. Sulawesi pix. 

Loxorhynchus grandis Stimpson 1857, the California Sheep Crab. West coast North America.  A cool to coldwater animal. This one at the Birch Aquarium is about a foot across. 


Genus Mithrax, now Mithraculus:

Banded Clinging Crab, Mithraculus (nee Mithrax) cinctimanus in residence in a Condylactis gigantea that its commensal with. Cozumel pix. 

Mithrax forceps, Red-Ridged Clinging Crab. Family Majidae. Tropical west Atlantic. 1/2-1". Here clinging to a piling at night off Bonaire.  

Mithrax (Mithraculus) sculptus, the Green/Emerald Crab. Tropical West Atlantic. A noted eater of algae (even Valonia), but can turn into a fish eater... some references state to 2.5 others to a maximum of four inches carapace width. Now in its own genus Mithraculus. Family Majidae.

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Mithrax spinosissimus (Lamarck 1818), spiny coral crab; the largest crab of the Caribbean; to a reported 2 kg.
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Schizophrys dama, Decorator (Sponge) Crabs. Many other species called, sold by this name.

Schizophrys aspera (H. Milne Edwards 1834). Prominent spines on carapace and first two segments of chelipeds. Reddish to brown overall color. To 15 cm. Indo-Mid-Pacific; East Africa to Hawai'i. N. Sulawesi pix. 

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Xenocarcinus conicus (H. Milne Edwards 1934). Elongated, triangular body. Variable color; silver, red... Found on hydroids, gorgonians, black corals. Western Pacific; Australia, New Guinea, Japan. N. Sulawesi pix. 

Xenocarcinus tuberculatus N. Sulawesi (Lembeh Strait) pix. "Xeno Crab". Indo West Pacific; South Africa to Japan. Most always found on whip corals.  To 1.5 cm. 

To: Part 1, Part 3,

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Marine Aquarium Algae Control

by Robert (Bob) Fenner

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