Ophiarachna Incrassata Classification Essay

Ophiarachna incrassata

(Lamarck, 1816)

Green Brittle Star

Likely Reef Tank Suitable

Likely Fish-Only Tank Suitable

Range: Indo-West Pacific Ocean: Sri Lanka to Hawaii.

Size: 22 inches (55 cm)

Natural Environment: Inhabits reef areas and generally found in crevices and under rocks.

General Husbandry: Occasionally seen in the trade.

Best maintained in aquaria with live rock caves where it can hide during daylight hours and since this is a scavenger, its best not placed in new systems.

During evening hours will search the substrates for organic matter.

A valuable member of a cleanup crew, as it will forge for uneaten foods. Nevertheless, to be sure its getting the nutrition needed, placing several shrimp pellets in dark corners of the aquarium in early evening hours a couple of times monthly may help lengthen its lifespan.

Taxonomy:

    Kingdom: Animalia

    Phylum: Echinodermata

    Class: Ophiuroidea

    Order: Ophiurida

    Family: Ophiodermatidae

    Genus: Ophiarachna

FYI: Has short yellow and black bristles along green arms. A commonly kept brittle star, however, a possible fish and shrimp eater.

Sudden changes in salinity may have a drastic result, therefore acclimate as noted below.

Experience Level: Intermediate

Diet: Omnivore

Aquarium Environment: Reef or fish-only aquarium

Coral Safe: Yes

Fish Safe: Yes

Invertebrate Safe: Yes

Acclimation Time: Sensitive to specific gravity/salinity changes, therefore be sure to adjust the bag's water to that of the aquarium in which it will be placed by slowly adding small amounts of aquarium water to the bag every few minutes. In most cases, this process should take at least 15 minutes.

Aquarium Hardiness: Moderate

Temperature Range: 72 - 82°F (22 - 28°C)

Minimum Tank Size: 100 gallons

Specific Gravity: 1.023 - 1.025

pH: 8.0 - 8.4

Ophiarachna affinisOphioderma appressum
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Photo © Bob Goemans

Classification / Names Common names | Synonyms | CoL | ITIS | WoRMS

Ophiuroidea | Ophiurida | Ophiodermatidae

Environment / Climate / Range Ecology

Reef-associated; depth range 1 - 20 m (Ref. 102355).  Tropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Indo-West Pacific: East Africa to New Guinea and the Philippines.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?  range ? - ? cm Max length : 5.5 cm WD male/unsexed; (Ref. 87041)

Size refers to disc diameter (Ref. 87041). Occurs on shallow reef flats under coral rubble, in seagrass beds and among algae. Feeds on small invertebrates (Ref. 800). Members of the class Ophiuroidea are mostly gonochoric, others are protandric. Fertilization is external. Brooding is common, bursae is used as brood chambers where the embryos develop into juveniles and later crawl out from the bursal slits. Life cycle: Embryos hatch into free-swimming planktotrophic larvae and later metamorphose into tiny brittle stars which sink down the bottom where they grow into adult form (Ref. 833).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Members of the class Ophiuroidea are mostly gonochoric, others are protandric. Fertilization is external. Brooding is common, bursae is used as brood chambers where the embryos develop into juveniles and later crawl out from the bursal slits. Life cycle: Embryos hatch into free-swimming planktotrophic larvae and later metamorphose into tiny brittle stars which sink down the bottom where they grow into adult form.

Main reference References | Coordinator | Collaborators

Schoppe, S. 2000. (Ref. 800)

IUCN Red List Status (Ref. 115185)

  Not Evaluated 

CITES status (Ref. 108899)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Human uses


| FishSource |

Internet sources

Estimates of some properties based on models

Preferred temperature (Ref. 115969): 24.5 - 29.3, mean 28.3 (based on 2687 cells).

Vulnerability Low vulnerability (10 of 100)

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