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Scapharca indica   (Gmelin, 1791)

rudder ark
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Classification
Bivalvia | Arcoida | Arcidae
Common names | Synonyms | CoL | ITIS | WoRMS

Main reference
Poutiers, J.M. 1998. (Ref. 348)
References | Biblio | Coordinator | Collaborators

Size / Weight / Age
Max length : 5.0 cm TL male/unsexed; (Ref. 348); common length : 4.0 cm TL male/unsexed; (Ref. 348)

Environment
Benthic; depth range 0 - 25 m (Ref. 348)

Climate / Range
Tropical

Distribution
Indo-West Pacific. Climate: tropical to subtropical.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description
Shell solid, laterally compressed and subrectangular in shape, very inequilateral, much longer than high and wider posteriorly; slightly inequivalve, left valve somewhat overlapping the right valve on posteroventral margin. Umbones small and situated anteriorly, cardinal area long and narrow. About 28 radial ribs (25 to 33) at each valve; ribs low and flat, wider than the interstices, slightly granulated on the anterior part of left valve. Periostracum coarse, concentrically striated. Internal margins with crenulations corresponding with the external radial ribs. No byssal gape. Colour: outside of shell whitish under the blackish brown periostracum. Inner side white, often tinged pale grey at periphery.

Biology     Glossary (e.g. epibenthic)

This species is considered to have a wide range, but the relationship between the Indian Ocean and West Pacific forms is insufficiently known (Ref. 348). On sand and mud bottoms. Littoral and sublittoral to a depth of 25 m (Ref. 348). Members of the class Bivalvia are mostly gonochoric, some are protandric hermaphrodites. Life cycle: Embryos develop into free-swimming trocophore larvae, succeeded by the bivalve veliger, resembling a miniature clam (Ref. 833).

IUCN Red List Status (Ref. 114614)

   

CITES status (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses
Fisheries: commercial
| FisheriesWiki |

More information

Countries
FAO areas
Ecosystems
Occurrences
Introductions
Stocks
Ecology
Diet
Food items
Common names
Synonyms
Predators
Reproduction
Maturity
Spawning
Eggs
Egg development
Age/Size
Growth
Length-weight
Length-length
Morphology
Larvae
Abundance
References
Mass conversion

Internet sources
BHL | BOLD Systems | Check for other websites | Check FishWatcher | CISTI | DiscoverLife | FAO(Publication : search) | GenBank (genome, nucleotide) | GOBASE | Google Books | Google Scholar | Google | ispecies | National databases | PubMed | Scirus | FishBase | Tree of Life | uBio | uBio RSS | Wikipedia (Go, Search) | Zoological Record

Estimation of some characteristics with mathematical models

Vulnerability (Ref. 71543)
Low vulnerability (10 of 100)
Price category (Ref. 80766)
Unknown