AESRD RESEARCH ATLAS / MARINE SOCIAL LIFE
Where have eusocial shrimp been found? Explore published locations of sponge-dwelling Synalpheus shrimp, and the promising leads that still need stronger evidence.
LOCATIONS & THE EVIDENCE BEHIND THEM
Approximate regional locators. Colours show evidence categories, not abundance or probability. Unmarked areas are not confirmed absences.
Select a location to highlight its marker and read the evidence. Switch to Caribbean detail for the clustered Atlantic records.
Documented eusocial colonies
Eusocial Synalpheus assemblage, including S. regalis
A major study region around Carrie Bow Cay. Later surveys reported declines and local losses; this marker records historical evidence, not a current census.
Source trail
Documented eusocial colonies
Eusocial Synalpheus; S. duffyi described from Isla Grande
A regional marker for Caribbean Panama, including Bocas del Toro and Isla Grande. It does not indicate a Pacific-coast record or a precise collecting station.
Source trail
Documented eusocial colonies
Synalpheus duffyi, S. elizabethae and S. regalis
Colony studies document eusocial shrimp in Jamaica. Subsequent population-change research reinforces the need to distinguish historical records from current abundance.
Source trail
Documented eusocial colonies
Includes Synalpheus cayoneptunus
The 2015 taxonomic study describes a eusocial species from the Florida Keys. The marker represents the island chain, not all of Florida.
Source trail
Documented eusocial colonies
Eusocial Synalpheus; regional record
The comparative colony study includes Bahamian material. Its regional summary does not establish occupation across the archipelago; this point is a locator only.
Source trail
Documented eusocial colonies
Synalpheus microneptunus
The species description reports small sponge-dwelling colonies, generally with one breeding female, from west-coast Barbados reefs.
Source trail
Research lead · not confirmed here
Synalpheus riosi
The authors describe 139 specimens apparently belonging to one colony and qualify the eusocial interpretation. We retain that uncertainty: a strong lead for further behavioural and colony study.
Source trail
Research lead · not confirmed here
Synalpheus duffyi
The taxonomic study extends this species’ distribution to Cuba. Species presence is a useful survey lead; it is not, by itself, verification of a eusocial colony at this regional marker.
Source trail
Research lead · not confirmed here
Synalpheus neptunus neptunus (name used by the source)
A sponge sample held 289 shrimp with one egg-bearing female. The authors suggested eusociality, while behavioural division of labour remained to be established. A promising Indo-Pacific research lead, not a confirmed eusocial population.
Source trail
Documented eusocial colonies
Synalpheus gustavi; S. sponjy with qualified evidence
The study reports two eusocial species from northwest Madagascar. Evidence for S. gustavi includes strong reproductive skew. No breeding female was recovered for S. sponjy, whose social organization is inferred more cautiously. This is not a claim that every defining behaviour was experimentally observed.
Source trail
Documented eusocial colonies
Synalpheus idelisae
The species description documents sponge-dwelling eusocial colonies from Dominican Republic reefs, including Dominicus, Peñon and Tortuga. This marker is separate from the island of Dominica.
Source trail
Documented eusocial colonies
Synalpheus idelisae
The same 2026 study reports colonies from Puerto Rico as well as the Dominican Republic. Colony observations, rather than species occurrence alone, support this regional entry.
Source trail
A MAP OF EVIDENCE
Teal circles identify regions with published eusocial-colony records. These are literature records, with the classification and limitations of their sources. A region is counted once; the total is neither a species count nor a count of colonies.
Amber diamonds identify promising research leads. Some reports describe suggestive colony structure; others record a species known for eusociality elsewhere. Each record explains the distinction. Amber is not a measured probability of finding a colony.
These shrimp live inside marine sponges. Finding a snapping shrimp, a sponge or a tropical reef does not by itself establish eusociality. Colony structure, reproduction, development and behaviour need careful examination. Read what makes a shrimp colony eusocial.
Grey land and unmarked water mean no record is plotted in this synthesis, not that shrimp are absent. This is a curated starting point rather than a complete survey of every reef or specimen. Historical observations do not establish current occupancy: repeat surveys have documented local losses.
KEEP THE CONTEXT WITH THE IMAGE
Suggested citation: AESRD (2026). Global eusocial shrimp locations: published records and research leads. Evidence review dated 18 October 2026. Link to this page when sharing the map, and consult the primary papers for scientific use.
THE COMPLETE EVIDENCE REGISTER
All locations and limitations remain readable without using the interactive map.
● Documented region
Eusocial Synalpheus assemblage, including S. regalis
Collections reported for 1993–2005
A major study region around Carrie Bow Cay. Later surveys reported declines and local losses; this marker records historical evidence, not a current census.
● Documented region
Eusocial Synalpheus; S. duffyi described from Isla Grande
Collections reported for 1988–2011
A regional marker for Caribbean Panama, including Bocas del Toro and Isla Grande. It does not indicate a Pacific-coast record or a precise collecting station.
● Documented region
Synalpheus duffyi, S. elizabethae and S. regalis
Collections reported for 2008
Colony studies document eusocial shrimp in Jamaica. Subsequent population-change research reinforces the need to distinguish historical records from current abundance.
Macdonald, Hultgren & Duffy (2009) · Bornbusch, Lefcheck & Duffy (2018) · Duffy et al. (2013)
● Documented region
Includes Synalpheus cayoneptunus
Florida Keys species description published 2015
The 2015 taxonomic study describes a eusocial species from the Florida Keys. The marker represents the island chain, not all of Florida.
● Documented region
Eusocial Synalpheus; regional record
Collections reported for 2001
The comparative colony study includes Bahamian material. Its regional summary does not establish occupation across the archipelago; this point is a locator only.
● Documented region
Synalpheus microneptunus
Collected October 2008; published 2011
The species description reports small sponge-dwelling colonies, generally with one breeding female, from west-coast Barbados reefs.
◇ Research lead · not confirmed here
Synalpheus riosi
Species description published 2008
The authors describe 139 specimens apparently belonging to one colony and qualify the eusocial interpretation. We retain that uncertainty: a strong lead for further behavioural and colony study.
◇ Research lead · not confirmed here
Synalpheus duffyi
Distribution record published 2015
The taxonomic study extends this species’ distribution to Cuba. Species presence is a useful survey lead; it is not, by itself, verification of a eusocial colony at this regional marker.
◇ Research lead · not confirmed here
Synalpheus neptunus neptunus (name used by the source)
Study collections in 2000 and 2002; published 2006
A sponge sample held 289 shrimp with one egg-bearing female. The authors suggested eusociality, while behavioural division of labour remained to be established. A promising Indo-Pacific research lead, not a confirmed eusocial population.
● Documented region
Synalpheus gustavi; S. sponjy with qualified evidence
Collected May 2008; published December 2023
The study reports two eusocial species from northwest Madagascar. Evidence for S. gustavi includes strong reproductive skew. No breeding female was recovered for S. sponjy, whose social organization is inferred more cautiously. This is not a claim that every defining behaviour was experimentally observed.
● Documented region
Synalpheus idelisae
Collected November 2024; published September 2026
The species description documents sponge-dwelling eusocial colonies from Dominican Republic reefs, including Dominicus, Peñon and Tortuga. This marker is separate from the island of Dominica.
● Documented region
Synalpheus idelisae
Collected March 2024; published September 2026
The same 2026 study reports colonies from Puerto Rico as well as the Dominican Republic. Colony observations, rather than species occurrence alone, support this regional entry.
METHOD & LIMITATIONS
This editorial synthesis groups selected primary-paper records by region. Records are classified from the evidence described in the cited studies, not inferred from map proximity, habitat suitability or general species databases. Species names follow the cited sources; some older names represent unresolved species complexes.
Coordinates in the downloads are approximate editorial locators in longitude and latitude (WGS84). They are not specimen coordinates, instructions for collecting, range boundaries or estimates of geographic uncertainty. The world and Caribbean panels use an equirectangular projection. Coastlines are simplified and small islands may be omitted.
The map is a versioned literature synthesis, not live monitoring. It has not undergone external peer review. Source-specific uncertainty is retained, and future evidence may change a marker’s category.
Basemap: Natural Earth, version 5.1.2, 1:110m world land and 1:50m Caribbean land; public-domain data. The accompanying PNG, SVG and data register are generated from the same records as the interactive map.
PRIMARY LITERATURE
Species treatment, material examined, ecology and colony size (Table 3): 2024 colonies from the Dominican Republic and Puerto Rico. Published 8 September 2026.
Species accounts and discussion: S. gustavi and S. sponjy from northwest Madagascar; eusocial classification based on colony evidence, with greater uncertainty for S. sponjy.
Table I (p. 964) and discussion (p. 973): a large colony with one egg-bearing female suggests eusociality, but behavioural division of labour is not demonstrated.
Methods (p. 3); S. duffyi and S. elizabethae ecology (pp. 22, 24); discussion of S. regalis colonies (p. 54).
Methods: Synalpheus collections and Study specimens. Lists five collection regions and the study’s eusocial species; it is not a complete range survey.
Material and methods; Synalpheus microneptunus, hosts and ecology. West-coast Barbados collections, October 2008.
Abstract and species accounts: S. duffyi from Caribbean Panama; S. riosi from Dominica described with explicitly qualified sociality.
Abstract and species accounts: S. cayoneptunus in the Florida Keys, and new S. duffyi records from Cuba and Florida.
Results and discussion: repeat surveys in Belize and Jamaica. Historical records cannot establish present-day occupancy.
A SHARED FIELD OF ENQUIRY
