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1

New synonymies and lectotype designations in the neotropical tribes Nycteliini, Praocini, and Scotobiini [Coleoptera: Tenebrionidae]

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Flores G. E.

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nr 3

EN

Seven new synonymies within the genus Praocis Eschscholtz, 1829 (Praocini) are proposed: P. audouini Solier, 1840 with P. sanguinolenta Gay et Solier, 1840; P. rufitarsis Gay et Solier, 1840 with P. tibialis Gay et Solier, 1840; P. submetallica Guérin-Méneville, 1834 with P. subaenea Erichson, 1834; P. chevrolati coquirnboana Kaszab, 1969 with P. chevrolati subcostata Gay et Solier, 1840; P. convexa Germain, 1855 with P. pleuroptera Gay et Solier, 1840; P. denseciliata Fairmaire, 1883 with P. striolicollis Fairmaire, 1883; and P. compacta Fairmaire, 1883 with P. inermis Burmeister, 1875. Two new synonymies within the genus Nyctelia Latreille, 1825 (Nycteliini) are proposed: N. planicauda Fairmaire, 1905 with N. laticauda Burmeister, 1877 and N. bifoveata Fairmaire, 1905 with N. vageimpressa Fairmaire, 1904. Praocis elliptica Philippi et Philippi, 1864 stat. rev., placed prior to this study as a synonym of P. submetallica, is reinstated as a valid name. Praocis concinna Burmeister, 1875 is rediscovered and assigned to the subgenus Postpraocis Kulzer. Lectotypes are designated for 66 nominal species of the Neotropical tribes Nycteliini, Praocini, and Scotobiini (Coleoptera: Tenebrionidae), including all the species treated in the synonymies.

2

Caenocrypticoides triplehorni new species, the first record of Caenocrypticini [Coleoptera: Tenebrionidae] in Argentina, with cladistic analysis of the genus

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Flores G. E. , Pizarro-Araya J.

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nr 4

EN

The South American genus Caenocrypticoides (Pimeliinae: Caenocrypticini) comprises five species distributed in western South America. A new species from western Argentina, the first record of the tribe east of the high Andes mountains, Caenocrypticoides triplehorni sp. nov., is described and included in the most recent key for the genus. Distributional and habitat records, SEM, and habitus photographs for this new species are included. A phylogeny of the five species of the genus is proposed, based on 19 morphological characters. The cladistic analysis provides one most parsimonious cladogram showing that four unambiguous synapomorphic characters of external morphology support the monophyly of Caenocrypticoides. Sexual dimorphism is for the first time reported for the genus and is present in all five species of the genus. A discussion on the biogeographic implications of the discovery of this new species east of the Andean mountains is presented, which also includes adding accurate data records and habitat associations for the Chilean species of the genus.

3

First fossil assemblage of darkling beetles (Coleoptera: Tenebrionidae) from Buenos Aires, Argentina: evidence of dry climate during the late Pleistocene in the humid Pampas

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Ramirez L. C. , Carrara R. , Silvestro V. A. , Flores G. E.

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nr 4

EN

Late Pleistocene outcrops exposed in Buenos Aires province, Argentina, represent one of the most informative sources for paleoecological studies on South American fauna and flora. Several proxies have been used for studying Pleistocene environmental conditions in the Pampas, but only a few were based on paleoentomological data. The aims of this study are to present the first record of three species of darkling beetles from the late Pleistocene of Buenos Aires province and to provide new paleoenvironmental information. The sediments containing fossil insects correspond to the Guerrero Member of the Luján Formation and were dated between 12,100 ± 100 14C BP and 13,400 ± 200 14C BP. Specimens of Nyctelia picipes (Billberg), Epipedonota cristallisata Waterhouse and Scotobius pilularius Germar were identified. To provide information about past climate, the particular climate requirements of these species were analyzed by using the Mutual Climatic Range method. This association could indicate the first pulse of post-glacial climate recovery and the replacement by the insect fauna currently inhabiting the area. This study is one of the first approaches to the Quaternary paleoentomology of Argentina, and highlights the potential of paleoentomological information, when evaluated in combination with previous knowledge on global climate conditions after the last glacial maximum.

4

Description of first instar larvae of the subgenus Praocis (Praocis) Eschscholtz, 1829 (Coleoptera: Tenebrionidae: Praociini)

45%

Pizarro-Araya J. , Marin D. A. , Contreras N. I. , Alfaro F. M. , Flores G. E.

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nr 4

EN

The subgenus Praocis Eschscholtz, 1829 (Pimeliinae: Praociini) is an endemic group of north-central Chile consisting of 18 flightless species distributed mostly across the Chilean desert and coastal steppe. In this work we describe the morphology and structure of first instar larvae of Praocis (Praocis) spinolai Gay and Solier, 1841, Praocis (Praocis) subaenea Erichson, 1834, and Praocis (Praocis) curta Solier, 1841 (Coleoptera: Tenebrionidae). Larvae were obtained by rearing wild-caught male and female individuals under laboratory conditions. The structure and external morphological characters of the larvae were analyzed by scanning electron microscopy (SEM). Results show that first instar larvae have morphological adaptations to edaphic environments, such as prothoracic legs for digging, a strongly sclerotized cephalic capsule, and well-developed IX and X abdominal segments (pygidium and pygopods). The interspecific differences in head morphology (cephalic capsule and epicranium), mouthparts (labrum, clypeus and mandibles), and IX and X abdominal segments (pygidium, pygopods, and apical spines) are highlighted.