diff --git a/mammalia.csl b/mammalia.csl
index 835adb264b1..40d90799a3d 100644
--- a/mammalia.csl
+++ b/mammalia.csl
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" version="1.0" default-locale="en-US">
+<style class="in-text" version="1.0" default-locale="en-GB" xmlns="http://purl.org/net/xbiblio/csl">
   <info>
     <title>Mammalia</title>
     <id>http://www.zotero.org/styles/mammalia</id>
     <link href="http://www.zotero.org/styles/mammalia" rel="self"/>
     <link href="http://www.zotero.org/styles/genetics" rel="template"/>
     <link href="https://www.degruyter.com/view/journals/mamm/mamm-overview.xml?tab_body=editorialContent-68857" rel="documentation"/>
-    <link href="http://www.degruyter.com/view/supplement/s18641547_Instructions_for_Authors.pdf" rel="documentation"/>
+    <link href="https://www.degruyter.com/supplemental/journals/mamm/mamm-overview.xml/Instructions_for_Authors.pdf" rel="documentation"/>
     <author>
       <name>Patrick O'Brien</name>
     </author>
@@ -14,7 +14,8 @@
     <category field="biology"/>
     <issn>0025-1461</issn>
     <eissn>1864-1547</eissn>
-    <updated>2020-04-20T10:34:52+00:00</updated>
+    <summary>Style for Mammalia as per the guidelines from October 1, 2020.</summary>
+    <updated>2021-01-11T13:22:22+00:00</updated>
     <rights license="http://creativecommons.org/licenses/by-sa/3.0/">This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 License</rights>
   </info>
   <macro name="editor-translator">
@@ -25,7 +26,7 @@
   </macro>
   <macro name="author">
     <names variable="author">
-      <name and="text" initialize-with="." name-as-sort-order="first" sort-separator=" "/>
+      <name and="text" initialize-with="." name-as-sort-order="all" sort-separator=" "/>
       <label form="short" prefix=" (" suffix=")" text-case="capitalize-first"/>
       <substitute>
         <names variable="editor"/>
@@ -52,14 +53,51 @@
     </names>
   </macro>
   <macro name="title">
-    <text variable="title"/>
+    <choose>
+      <if type="bill book graphic legal_case legislation motion_picture song thesis" match="any">
+        <text variable="title" font-style="italic"/>
+      </if>
+      <else>
+        <text variable="title"/>
+      </else>
+    </choose>
   </macro>
   <macro name="publisher">
     <group delimiter=", ">
+      <text variable="genre"/>
       <text variable="publisher"/>
       <text variable="publisher-place"/>
     </group>
   </macro>
+  <macro name="access">
+    <choose>
+      <if type="article-journal" match="any">
+        <choose>
+          <if match="none" variable="page volume">
+            <text variable="DOI" prefix="DOI: " suffix="(Epub ahead of print)"/>
+          </if>
+        </choose>
+      </if>
+      <else-if type="webpage post post-weblog" match="any">
+        <group delimiter=" ">
+          <group delimiter=": ">
+            <text term="available at" text-case="capitalize-first"/>
+            <text variable="URL" prefix="&lt;" suffix="&gt;"/>
+          </group>
+          <group delimiter=" " prefix="(" suffix=")">
+            <text term="accessed" text-case="capitalize-first"/>
+            <date form="text" variable="accessed"/>
+          </group>
+        </group>
+      </else-if>
+    </choose>
+  </macro>
+  <macro name="edition">
+    <group delimiter=" ">
+      <number variable="edition" form="ordinal"/>
+      <label variable="edition" form="short"/>
+    </group>
+  </macro>
   <citation collapse="year-suffix" et-al-min="3" et-al-use-first="1" disambiguate-add-year-suffix="true">
     <sort>
       <key variable="issued"/>
@@ -78,7 +116,7 @@
       </group>
     </layout>
   </citation>
-  <bibliography>
+  <bibliography et-al-min="11" et-al-use-first="10">
     <sort>
       <key macro="author"/>
       <key variable="issued"/>
@@ -86,14 +124,17 @@
     <layout suffix=".">
       <group delimiter=". ">
         <text macro="author"/>
-        <date date-parts="year" form="text" variable="issued"/>
+        <date date-parts="year" form="text" variable="issued" prefix="(" suffix=")"/>
         <choose>
-          <if type="bill book graphic legal_case legislation motion_picture report song" match="any">
-            <group>
-              <text macro="title"/>
-              <text macro="editor-translator"/>
+          <if type="bill book graphic legal_case legislation motion_picture report song thesis" match="any">
+            <group delimiter=". ">
+              <group delimiter=", ">
+                <text macro="title"/>
+                <text macro="editor-translator"/>
+                <text macro="edition"/>
+              </group>
+              <text macro="publisher"/>
             </group>
-            <text prefix=" " suffix="." macro="publisher"/>
           </if>
           <else-if type="chapter paper-conference" match="any">
             <group delimiter=". ">
@@ -101,13 +142,13 @@
               <group delimiter=" ">
                 <group delimiter=": ">
                   <text term="in" text-case="capitalize-first"/>
-                  <names variable="editor translator" prefix="(" suffix=")">
-                    <name prefix=" " initialize-with=". " name-as-sort-order="all" sort-separator=" "/>
-                    <label form="short" prefix=", "/>
+                  <names variable="editor translator">
+                    <name prefix=" " and="text" initialize-with=". " name-as-sort-order="all" sort-separator=" "/>
+                    <label form="short" text-case="capitalize-first" prefix=" (" suffix=")"/>
                   </names>
                 </group>
                 <group delimiter=", ">
-                  <text variable="container-title"/>
+                  <text variable="container-title" font-style="italic"/>
                   <text variable="collection-title"/>
                 </group>
               </group>
@@ -119,18 +160,24 @@
             </group>
           </else-if>
           <else>
-            <group delimiter=". ">
-              <group delimiter=", ">
-                <text macro="title"/>
-                <text macro="editor-translator"/>
-              </group>
-              <group delimiter=" ">
-                <text variable="container-title" form="short"/>
-                <group delimiter=": ">
-                  <text variable="volume"/>
-                  <text variable="page"/>
+            <group delimiter=", ">
+              <group delimiter=". ">
+                <group delimiter=", ">
+                  <text macro="title"/>
+                  <text macro="editor-translator"/>
+                </group>
+                <group delimiter=" ">
+                  <text variable="container-title" form="short"/>
+                  <group delimiter=": ">
+                    <group>
+                      <text variable="volume"/>
+                      <text variable="issue" prefix="(" suffix=")"/>
+                    </group>
+                    <text variable="page"/>
+                  </group>
                 </group>
               </group>
+              <text macro="access"/>
             </group>
           </else>
         </choose>