Abstract
Nineteen new species of Exocelina Broun, 1886 from New Guinea are described herein: E.adelbertensissp. n., E.ambuasp. n., E.bewanisp. n., E.cyclopssp. n., E.ibalimisp. n., E.kekisp. n., E.kumulensissp. n., E.mendiensissp. n., E.menyamyasp. n., E.okapasp. n., E.piusisp. n., E.pseudofumesp. n., E.pseudopusillasp. n., E.pusillasp. n., E.simasp. n., E.simbaiensissp. n., E.simbaijimisp. n., E.sumokedisp. n., and E.yoginofisp. n. All of them, together with five already described species, have been united into the newly defined casuarina-group, a polyphyletic complex of related species with similar shape of the median lobe and paramere setation. An identification key to all known species of the group is provided, and important diagnostic characters (habitus, color, male protarsomeres 4–5, median lobes, and parameres) are illustrated. Data on the distribution of the species are given, showing that most of the species occur in the central, mountain part of Papua New Guinea.
Highlights
Australian National Insect Collection, Canberra, Australia The Natural History Museum, London, UK Collection of Lars Hendrich, Munich, Germany Institute of Entomology, Biology Centre ASCR, České Budějovice, Czech Republic Muséum National d’Histoire Naturelle, Paris, France Museum Zoologicum Bogoriense, Cibinong, Indonesia Naturhistorisches Museum Wien, Vienna, Austria Naturhistorisches Museum Basel, Switzerland Zoologische Staatsammlung München, Munich, Germany. All methods follow those described in detail in our previous articles (Shaverdo and Balke 2014, Shaverdo et al 2012, 2014)
All specimen data are quoted as they appear on the labels attached to the specimens
Most of its species are readily distinguished by the thickened apex of their median lobe in lateral view, which is a character in common for all the members of this group
Summary
Introduction of theExocelina casuarina-group, with a key to its representatives and descriptions of 19 new species from New Guinea (Coleoptera, Dytiscidae, Copelatinae)Helena Shaverdo1, Katayo Sagata2, Michael Balke3Academic editor: Mariano Michat | Received 6 August 2018 | Accepted 22 October 2018 | Published 6 December 2018 http://zoobank.org/936CFD88-F297-440E-A9BE-4C258AE9BD09Nineteen new species of Exocelina Broun, 1886 from New Guinea are described : E. adelbertensis sp. n., E. ambua sp. n., E. bewani sp. n., E. cyclops sp. n., E. ibalimi sp. n., E. keki sp. n., E. kumulensis sp. n., E. mendiensis sp. n., E. menyamya sp. n., E. okapa sp. n., E. piusi sp. n., E. pseudofume sp. n., E. pseudopusilla sp. n., E. pusilla sp. n., E. sima sp. n., E. simbaiensis sp. n., E. simbaijimi sp. n., E. sumokedi sp. n., and E. yoginofi sp. n.
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