diff --git a/CHANGES.md b/CHANGES.md
index 85b5206248..31b101e75e 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,7 @@
 
 #### next release (8.7.7)
 
+- Improve default supported formats for ArcGisPortalItemReference.
 - [The next improvement]
 
 #### 8.7.6 - 2024-08-22
diff --git a/lib/Models/Catalog/Esri/ArcGisPortalItemReference.ts b/lib/Models/Catalog/Esri/ArcGisPortalItemReference.ts
index 0232f355aa..c67bfe1930 100644
--- a/lib/Models/Catalog/Esri/ArcGisPortalItemReference.ts
+++ b/lib/Models/Catalog/Esri/ArcGisPortalItemReference.ts
@@ -166,15 +166,16 @@ export default class ArcGisPortalItemReference extends AccessControlMixin(
       createStratumInstance(ArcGisPortalItemFormatTraits, {
         id: "WMS",
         formatRegex: "WMS",
-        urlRegex: "WMSServer",
+        urlRegex: "WMSServer|wms$",
         definition: {
-          type: "wms"
+          type: "wms-group"
         }
       }),
       createStratumInstance(ArcGisPortalItemFormatTraits, {
         id: "ArcGIS MapServer Group",
         formatRegex: "Map Service",
-        urlRegex: "MapServer$|MapServer/$",
+        urlRegex:
+          /MapServer$|MapServer\/$|MapServer\?f=pjson$|MapServer\?f=json$/,
         definition: {
           type: "esri-mapServer-group"
         }
@@ -187,6 +188,14 @@ export default class ArcGisPortalItemReference extends AccessControlMixin(
           type: "esri-mapServer"
         }
       }),
+      createStratumInstance(ArcGisPortalItemFormatTraits, {
+        id: "ArcGIS ImageServer",
+        formatRegex: "Map Service",
+        urlRegex: /ImageServer/,
+        definition: {
+          type: "esri-imageServer"
+        }
+      }),
       createStratumInstance(ArcGisPortalItemFormatTraits, {
         id: "ArcGIS FeatureServer Group",
         formatRegex: "Feature Service",