Sunray Venus

Identification overview

The sunray venus, Macrocallista nimbosa, has an elongated oval shell with a glossy surface and relatively little raised sculpture. Darker rays cross a salmon, gray or purplish background, giving the animal its memorable common name. Compared with a strongly ridged quahog, its outline is longer and its exterior smoother.

Florida context and the limits of a range map

Published accounts include the Atlantic coast and Florida as well as the Gulf. University of Florida researchers have collected living broodstock from natural groups on Florida’s Gulf side and studied the species as a possible aquaculture crop. Florida DEP’s 2014 St. Lucie Inlet Preserve State Park animal inventory also lists this species, providing a dated Atlantic-coast record within the regional corridor.

An official park inventory supports regional inclusion, but it is not a fresh population survey or a promise of common sightings. A broad range statement, a preserved shell and a living animal photographed in place also represent different kinds of evidence. Its ecological setting is sandy bottom rather than exposed coral-reef structure.

Feeding and reproduction

The sunray venus is a suspension-feeding bivalve. In culture research, adults and young were maintained on microalgae. This supports a description of its feeding mode without assigning a precise wild menu or claiming that every particle captured is eaten.

Males and females are separate. Spawning produces larvae that develop in the water before settling and metamorphosing. Hatchery success demonstrates those developmental stages, but a hatchery schedule is not a reliable calendar for spawning at every natural Florida site. Temperature, food and local conditions must not be replaced by an invented universal season.

Identification approach

Start with the long oval outline, subdued sculpture and radiating bands. Compare both exterior and interior views of an already empty shell when available. A sunray pattern is a clue, not a substitute for examining the entire shell. Worn, stained or fragmented shells may not preserve enough information for a confident species identification.

A responsible encounter

Do not dig through a bed or remove a living clam to stage a photograph. Record whether a shell was alive, naturally exposed, empty underwater or washed ashore. This preserves information that an attractive close-up alone cannot provide.

Florida shellfish-area classifications and local collecting restrictions apply independently of identification. A clam being investigated for aquaculture does not make a wild collection legal or safe to eat. Consult current official guidance, respect protected habitats and leave uncertain animals undisturbed.

References

• National Shell Museum identification reference
• Species biology reference
• UF/IFAS: Introducing Florida’s sunray venus clam
• Florida DEP: 2014 St. Lucie Inlet Preserve State Park plan, local animal record
• FWC: Current recreational saltwater rules

Current Florida collection cautions

Reviewed November 12, 2026. Collecting a shell containing a living organism generally requires a Florida recreational saltwater fishing license. Species rules and park, refuge or sanctuary restrictions apply independently of identification. Leave occupied shells and their habitat undisturbed. FWC requires clams, oysters and mussels to come only from designated approved or conditionally approved shellfish areas that FDACS currently lists as open. Closed waters cannot be harvested. Check the exact area map and daily status; no location is cleared by this profile. This guide gives no harvest permission or assurance that an animal is safe to eat. Official FWC live-shell collection guidance Official FWC oyster and clam rules Official FDACS shellfish classification and status

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