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EN
Populations of two rodent species were studied during 1996-1998 on a 4-ha island covered with a mixed forest. Population sizes varied within and between years. In total, the material consisted of 10 839 captures of 1925 bank volesand 2941 captures of 881 yellow-necked mice. The redonts were categorised as immature males, mature males, immature females, mature non-pregnant females, and mature pregnant females. It has been found that the weather did not influence trappability (measured as the reciprocal of the mean time that elapsed between successive captures of a bank vole or a yellow-necked mouse. The trappability of different categories of individuals was related to the social systems of the two species. This is indicated by the dependence of the trappability of all categories of individuals on the population size (it was lowest at the highest population numbers), and also by the dependence of trappability on body weight (positive in male voles and negative in male mice). The trappability of immature females and mature males of the bank vole increased with increasing home range size, whereas in other categories of individuals, like in all categories of the yellow-necked mouse individuals, an increase in home range size was not accompanied by changes in trappability. Thus, there is no trappability typical of the whole order of rodents; it should always be related to the species and to the character of its social system.
EN
Bezzia galesa Spinelli, a new Patagonian species, is described in all stages and illustrated by using binocular, phase-contrast and scanning electron microscopy. Immatures were collected associated to submerged filamentous algae in an unnamed pond in western Chubut province, Argentina, and reared to adults in the laboratory. Adults and immatures of this new species are compared with the most similar species Bezzia ventanerisis Spinelli, Bezzia roldani Spinelli et Wirth and Bezzia blantoni Spinelli et Wirth. Details on the rearing process and feeding behavior in laboratory are given.
EN
The Cryptoglossini (Coleoptera: Tenebrionidae: Pimeliinae) is revised. The species are relatively large beetles, which are irregularly distributed throughout much of the highly arid areas of Southwestern United States and Mexico. The tribe is composed of three monophyletic genera: Asbolus LeConte, Cryptoglossa Sober, and Schizillus Horn. Adult external and internal reproductive structures of the tribe are described and illustrated. Immature stages are described for Cryptoglossa muricata (LeConte), Cryptoglossa infausta (LeConte), Cryptoglossa asperata (Horn), Cryptoglossa spiculifera LeConte, Cryptoglossa variolosa (Horn), Asbolus verrucosus LeConte, Asbolus laevis LeConte, Asbolus mexicanus (Champion), Schizillus laticeps Horn, and Schizillus nunenmacheri Blaisdell. Keys are provided for the adult genera and species and for the known immature stages. A new subspecies, Cryptoglossa seriata cerralvoensis, is described from Mexico. Centrioptera Mannerheim is placed as a synonym of Cryptoglossa Sober. Asbolus LeConte is reinstated to replace Cryptoglossa (in part). Eschatoporis Blaisdell is removed to the Laenini (Lagriinae). A phylogeny, based on 50 adult and immature characters is proposed established on cladistic methodology. Phylogenetic relationships and systematic position of the subfamily, tribe, genera and species are examined. The biology of the species is discussed including ecological, morphological, and physiological adaptations to aridity. Ecological adaptations include strategies to acclimate to extreme environmental conditions: surface/subsurface daily and seasonal activity patterns, cavity utilization, substrate preference/restrictions (C. muricata, A. verrucosus, S. laticeps), euryphagous feeding habits, avoidance of interspecific competition. Adult and immature morphological adaptations include locomotory modifications relative to substrate utilization (i.e. larval madibular expansion in all Cryptoglossini) and heat avoidance modifications (i.e. subelytral/subpronotal cavities in A. verrucosus, A. laevis and A. papillosus. Physiological adaptations include high heat and wide humidity range tolerance (C. muricata and A. verrucosus), epicuticular lipids with high rations of straight-chain hydrocarbons (C. variolosa and A. verrucosus), long larval and adult life spans (seven years recorded for A. verrucosus). Specialized environmental adaptations include psammophily (A. verrucosus, A. papillosus and A. laevis, being respectively more adapted to psammophily, the last two restricted to sand dunes) and troglophily (S. nunenmacheri and A. mexicanus). Ecological importance (biomass) and economic importance of species is discussed. Predators and parasites of the Cryptoglossini are addressed. Catagoniopsis specularis (Aldrich and Weber), (Tachinidae) is recorded reared from both A. verrucosus and A. laevis. Defensive behavioral strategies include escape to shelters (Cryptoglossa), death feigning (all Cryptoglossa observed except C. asperata; most developed in Asbolus) and head standing (most immediate defense in all Cryptoglossa observed, absent in Asbolus and Schizillus except A. laevis).
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