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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.

nr 4

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.

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

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

nr 4

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.