diff --git a/swh/lister/bitbucket/tasks.py b/swh/lister/bitbucket/tasks.py
--- a/swh/lister/bitbucket/tasks.py
+++ b/swh/lister/bitbucket/tasks.py
@@ -3,7 +3,7 @@
 # See top-level LICENSE file for more information
 
 from swh.lister.core.tasks import (IndexingDiscoveryListerTask,
-                                   IndexingRangeListerTask,
+                                   RangeListerTask,
                                    IndexingRefreshListerTask, ListerTaskBase)
 
 from .lister import BitBucketLister
@@ -20,7 +20,7 @@
     task_queue = 'swh_lister_bitbucket_discover'
 
 
-class RangeBitBucketLister(BitBucketListerTask, IndexingRangeListerTask):
+class RangeBitBucketLister(BitBucketListerTask, RangeListerTask):
     task_queue = 'swh_lister_bitbucket_refresh'
 
 
diff --git a/swh/lister/core/tasks.py b/swh/lister/core/tasks.py
--- a/swh/lister/core/tasks.py
+++ b/swh/lister/core/tasks.py
@@ -49,25 +49,41 @@
         pass
 
 
-class IndexingDiscoveryListerTask(ListerTaskBase):
-    def run_task(self, *args, **kwargs):
-        lister = self.new_lister(*args, **kwargs)
-        return lister.run(min_index=lister.db_last_index(), max_index=None)
+# Paging/Indexing lister tasks derivatives
+# (cf. {github/bitbucket/gitlab}/tasks)
+
 
+class RangeListerTask(ListerTaskBase):
+    """Range lister task.
 
-class IndexingRangeListerTask(ListerTaskBase):
+    """
     def run_task(self, start, end, *args, **kwargs):
         lister = self.new_lister(*args, **kwargs)
         return lister.run(min_index=start, max_index=end)
 
 
+# Indexing Lister tasks derivatives (cf. {github/bitbucket}/tasks)
+
+
+class IndexingDiscoveryListerTask(ListerTaskBase):
+    """Incremental indexing lister task.
+
+    """
+    def run_task(self, *args, **kwargs):
+        lister = self.new_lister(*args, **kwargs)
+        return lister.run(min_index=lister.db_last_index(), max_index=None)
+
+
 class IndexingRefreshListerTask(ListerTaskBase):
+    """Full indexing lister task.
+
+    """
     GROUP_SPLIT = 10000
 
     def run_task(self, *args, **kwargs):
         lister = self.new_lister(*args, **kwargs)
         ranges = lister.db_partition_indices(self.GROUP_SPLIT)
         random.shuffle(ranges)
-        range_task = IndexingRangeListerTask()
+        range_task = RangeListerTask()
         group(range_task.s(minv, maxv, *args, **kwargs)
               for minv, maxv in ranges)()
diff --git a/swh/lister/github/tasks.py b/swh/lister/github/tasks.py
--- a/swh/lister/github/tasks.py
+++ b/swh/lister/github/tasks.py
@@ -3,7 +3,7 @@
 # See top-level LICENSE file for more information
 
 from swh.lister.core.tasks import (IndexingDiscoveryListerTask,
-                                   IndexingRangeListerTask,
+                                   RangeListerTask,
                                    IndexingRefreshListerTask, ListerTaskBase)
 
 from .lister import GitHubLister
@@ -19,7 +19,7 @@
     task_queue = 'swh_lister_github_discover'
 
 
-class RangeGitHubLister(GitHubListerTask, IndexingRangeListerTask):
+class RangeGitHubLister(GitHubListerTask, RangeListerTask):
     task_queue = 'swh_lister_github_refresh'
 
 
diff --git a/swh/lister/gitlab/tasks.py b/swh/lister/gitlab/tasks.py
--- a/swh/lister/gitlab/tasks.py
+++ b/swh/lister/gitlab/tasks.py
@@ -2,9 +2,8 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from swh.lister.core.tasks import (IndexingDiscoveryListerTask,
-                                   IndexingRangeListerTask,
-                                   IndexingRefreshListerTask, ListerTaskBase)
+from swh.lister.core.tasks import ListerTaskBase, RangeListerTask
+
 
 from .lister import GitLabLister
 
@@ -16,14 +15,10 @@
             lister_name=lister_name, api_baseurl=api_baseurl)
 
 
-class IncrementalGitLabDotComLister(GitLabDotComListerTask,
-                                    IndexingDiscoveryListerTask):
-    task_queue = 'swh_lister_gitlab_discover'
-
+class RangeGitLabLister(GitLabDotComListerTask, RangeListerTask):
+    """GitLab lister working on specified range (start, end) arguments.
 
-class RangeGitLabLister(GitLabDotComListerTask, IndexingRangeListerTask):
+    """
     task_queue = 'swh_lister_gitlab_refresh'
 
 
-class FullGitLabRelister(GitLabDotComListerTask, IndexingRefreshListerTask):
-    task_queue = 'swh_lister_gitlab_refresh'