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Isognomon ephippium, Saddle tree oyster

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Isognomon ephippium   (Linnaeus, 1758)

Saddle tree oyster

Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Isognomon ephippium  AquaMaps  Data sources: GBIF OBIS
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Image of Isognomon ephippium (Saddle tree oyster)
Isognomon ephippium

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

Bivalvia | Ostreida | Isognomonidae

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

Benthic; brackish.  Tropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Indo-West Pacific: from East Africa, to Melanesia; north to Japan and south to Indonesia.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?  range ? - ? cm Max length : 14.0 cm SHL male/unsexed; (Ref. 348); common length : 10.0 cm SHL male/unsexed; (Ref. 348)

Short description Morphology

Shell variable, irregularly rounded in outline, with height about equal to length. Dorsal margin straight and relatively short, not expanded posteriorly in a wing-like ear. Anterior margin sharply sinuous dorsally, ventrally strongly convex and extending well forward of umbones. Posterior margin slightly concave, forming an obsolete angulation with the rounded ventral margin. Umbones small, pointing at anterior end of dorsal margin. Outer surface covered with concentric lamellar processes, with very low radial ridge ending at posteroventral angulation. Ligamental area with a dozen transverse grooves. Nacreous area of the inner side of shell surrounded by a broad, non-nacreous margin. Colour: outside of shell horny to purplish brown. Interior nacreous, with a broad dark brown margin.

Biology     Glossary (e.g. epibenthic)

Attached to rocks and other hard substrates, in marine and brackish water areas (Ref. 348), with sandy and muddy bottoms (Ref. 128042). Common in muddy estuaries and mangrove where it attaches to prop roots. Littoral and shallow subtidal levels (Ref. 348).

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. 130435: Version 2024-2)

  Not Evaluated 

CITES status (Ref. 108899)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless

Human uses


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Estimates based on models

Preferred temperature (Ref. 115969): 23.9 - 29.3, mean 28.4 (based on 3365 cells).
Vulnerability (Ref. 71543): Low vulnerability (10 of 100).
Price category (Ref. 80766): Unknown.

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