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Tegillarca granosa   (Linnaeus, 1758)

Granular ark

Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Tegillarca granosa  AquaMaps  Data sources: GBIF OBIS
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Image of Tegillarca granosa (Granular ark)
Tegillarca granosa
Picture by FAO

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

Bivalvia | Arcida | Arcidae

Environment: milieu / climate zone / depth range / distribution range Ecology

Benthic; brackish; depth range 0 - 20 m (Ref. 101198).  Tropical, preferred 27°C (Ref. 107945); 46°N - 39°S, 26°E - 134°W (Ref. 106948)

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions


Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 1 - 1 cm Max length : 9.0 cm TL male/unsexed; (Ref. 348); common length : 6.0 cm TL male/unsexed; (Ref. 348)

Short description Morphology

Shell equivalve, thick and solid, ovate, strongly inflated, slightly longer than high and feebly inequilateral. Umbones strongly protruding, cardinal area rather large. About 18 radial ribs (15 to 20) with wide interstices at each valve; ribs stout and distinctly rugose, bearing regular, often rectangular nodules. Periostracum rather thin and smooth. Internal margins with strong crenulations corresponding with the external radial ribs. No byssal gape. Colour: outside of shell white under the yellowish brown periostracum. Inner side white, often tinged yellow towards the umbonal cavity.

Biology     Glossary (e.g. epibenthic)

This represents the most important commercial ark (Ref. 348). Lives in intertidal and shallow subtidal waters. On muddy bottoms, mainly in protected bays and estuaries, or in mangroves. Often occurring in dense populations (Ref. 348). Typically found in the intertidal with silty bottoms with low salinity. A filter-feeder and a shallow burrower. Primarily feeds on organic detritus, phytoplankton and detritus (Ref. 101198). Spawns throughout the year, with peaks in January and April (Ref. 75727).

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

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.

Main reference References | Coordinator | Collaborators

Poutiers, J.M. 1998. (Ref. 348)

IUCN Red List Status (Ref. 124695)

CITES status (Ref. 108899)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans


Human uses

Fisheries: commercial
FAO - Aquaculture: production; Fisheries: landings, species profile | FishSource | Sea Around Us


Internet sources

BHL | BOLD Systems | CISTI | DiscoverLife | FAO(Fisheries: species profile; publication : search) | GenBank (genome, nucleotide) | GloBI | Gomexsi | Google Books | Google Scholar | Google | ispecies | PubMed | Tree of Life | Wikipedia (Go, Search) | Zoological Record

Estimates of some properties based on models

Preferred temperature (Ref. 115969): 21.8 - 29.3, mean 28.4 (based on 3701 cells).
Prior r = 0.85, 95% CL = 0.56 - 1.28, Based on 2 stock assessments.
Vulnerability (Ref. 71543)
Low vulnerability (10 of 100)
Price category (Ref. 80766)