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Herein,    Austrelatus    gen. nov.  (type species:    Copelatus   irregularis    W.J. Macleay, 1871) is described for a distinctive lineage of predominantly Australasian species previously assigned to    Copelatus    Erichson, 1832. The new genus was retrieved as well supported, monophyletic clade in phylogenetic analysis of DNA sequences data using Bayesian and parsimony approaches. The main morphological diagnostic character of    Austrelatus    is a complex median lobe of the aedeagus, with evident dorsal and ventral sclerites usually divided in apical half into two lobes of different shape or otherwise modified. Morphological comparison of the new genus with other   Copelatinae   genera, especially with    Copelatus    and    Exocelina    Broun, 1886, and a generic key to the New Guinean   Copelatinae   are provided. New combinations are established for 31 already described species mainly from the Australian Region (all from    Copelatus   ):    Austrelatus   adelbert    (Megna, Atthakor, Manaono, Hendrich &amp; Balke, 2017),  comb. nov. ;    A.   badeni    (Sharp, 1882),  comb. nov. ;    A.   bakewelli    (J. Balfour-Browne, 1939),  comb. nov. ;    A.   baranensis    (Hájek, Shaverdo, Hendrich &amp; Balke, 2021),  comb. nov. ;    A.   bougainvillensis    (Hájek, Shaverdo, Hendrich &amp; Balke, 2021),  comb. nov. ;    A.   boukali    (Hendrich &amp; Balke, 1998),  comb. nov. ;    A.   clarki    (Sharp, 1882),  comb. nov. ;    A.   daemeli    (Sharp, 1882),  comb. nov. ;    A.   davidi    (Wewalka, 2017),  comb. nov. ;    A.   deccanensis    (Sheth, Ghate &amp; Hájek, 2018),  comb. nov. ;    A.   fidschiensis    (Zimmermann, 1928),  comb. nov. ;    A.   gestroi    (Régimbart, 1892),  comb. nov. ;    A.   irregularis    (W.J. Macleay, 1871),  comb. nov. ;    A.   kaszabi    (Guignot, 1956),  comb. nov. ;    A.   kietensis    (Hájek, Shaverdo, Hendrich &amp; Balke, 2021),  comb. nov. ;    A.   laevipennis    (Hájek, Shaverdo, Hendrich &amp; Balke, 2021),  comb. nov. ;    A.   luteomaculatus    (Guignot, 1956),  comb. nov. ;    A.   maushomi    (Sheth, Ghate &amp; Hájek, 2018),  comb. nov. ;    A.   neoguineensis    (Zimmermann, 1919),  comb. nov. ;    A.   nigrolineatus    (Sharp, 1882),  comb. nov. ;    A.   papuensis    (J. Balfour-Browne, 1939),  comb. nov. ;    A.   parallelus    (Zimmermann, 1920a),  comb. nov. ;    A.   schuhi    (Hendrich &amp; Balke, 1998),  comb. nov. ;    A.   sibelaemontis    (Hájek, Hendrich, Hawlitschek &amp; Balke, 2010),  comb. nov. ;    A.   strigosulus    (Fairmaire, 1878),  comb. nov. ;    A.   ternatensis    (Régimbart, 1899),  comb. nov. ;    A.   uludanuensis    (Hendrich &amp; Balke, 1995),  comb. nov. ;    A.   urceolus    (Hájek, Shaverdo, Hendrich &amp; Balke, 2021),  comb. nov. ;    A.   variistriatus    (Hájek, Shaverdo, Hendrich &amp; Balke, 2021),  comb. nov. ;    A.   wallacei    (J. Balfour-Browne, 1939),  comb. nov.  and    A.   xanthocephalus    (Régimbart, 1899),  comb. nov.    Austrelatus    species from New Guinea are divided into two informal species groups, the    A.   neoguineensis    group and    A.   papuensis    group, and    A.   fumato    sp. nov.  and    A.   setiphallus    sp. nov.  standing aside of them. The    A.   neoguineensis    group is introduced with three previously known species and 29 new species described here based on the morphological characters and Cox1 data:    Austrelatus   baliem    sp. nov. ,    A.   bormensis    sp. nov. ,    A.   brazza    sp. nov. ,    A.   debulensis    sp. nov. ,    A.   fakfak    sp. nov. ,    A.   febrisauri    sp. nov. ,    A.   fojaensis    sp. nov. ,    A.   garainensis    sp. nov. ,    A.   innominatus    sp. nov. ,    A.   lembenensis    sp. nov. ,    A.   lisae    sp. nov. ,    A.   manokwariensis    sp. nov. ,    A.   mimika    sp. nov. ,    A.   mirificus    sp. nov. ,    A.   moreguinensis    sp. nov. ,    A.   nadjae    sp. nov. ,    A.   oksibilensis    sp. nov. ,    A.   pseudoneoguineensis    sp. nov. ,    A.   pseudoksibilensis    sp. nov. ,    A.   rajaampatensis    sp. nov. ,    A.   rouaffer    sp. nov. ,    A.   rugosus    sp. nov. ,    A.   sandaunensis    sp. nov. ,    A.   sarmiensis    sp. nov. ,    A.   securiformis    sp. nov. ,    A.   testegensis    sp. nov. ,    A.   toricelli    sp. nov. ,    A.   vagauensis    sp. nov. , and    A.   wanggarensis    sp. nov.    Copelatus   vagestriatus    Zimmermann, 1919,  syn. nov.  is recognised as a junior subjective synonym of    A.   clarki    (Sharp, 1882). The lectotypes of    Copelatus   gestroi    Régimbart, 1892,    C.   neoguineensis    Zimmermann, 1919 and    C.   xanthocephalus    Régimbart, 1899 are designated. All species are (re)described, and their important species characters (genitalia, habitus, and colour patterns) are illustrated. Keys to all species are provided. The known distribution and habitat preferences of each species are outlined briefly. New Guinean    Austrelatus    occupy a variety of stagnant water habitats, either lentic  sensu stricto , or standing water associated with lotic habitats (e.g., backflows, rockpools, intermittent / ephemeral stream pools).

zookeys

﻿   Austrelatus    gen. nov., a new genus of Australasian diving beetles (  Coleoptera  ,   Dytiscidae  ,   Copelatinae  ), with the discovery of 31 new species from New Guinea

﻿ Austrelatus gen. nov., a new genus of Australasian diving beetles ( Coleoptera , Dytiscidae , Copelatinae ), with the discovery of 31 new species from New Guinea

Austrelatus gen. nov., a new genus of Australasian diving beetles ( Coleoptera , Dytiscidae , Copelatinae ), with the discovery of 31 new species from New Guinea