TL;DR: The authors explored the species radiations of Eutarsopolipus on the pterostichine genera Castelnaudia and Notonomus found in the rainforests of eastern Australia.
Abstract: Eutarsopolipus (Acari: Podapolipidae) is a large genus of mites parasitic in the subelytral space of carabid beetles. Herein, I explore the species radiations of Eutarsopolipus on the pterostichine genera Castelnaudia and Notonomus found in the rainforests of eastern Australia. Castelnaudia has an extraordinary radiation of podapolipid mite species, with most beetle species carrying multiple species of mites unique to each host. In contrast, each Notonomus species had just one species of Eutarsopolipus (with the exception of a single male mite of another species), and in four of the five host species examined, the single mite species could not be distinguished from each other. The host beetles and their new mite species are: Castelnaudia cordata with E. hebronae sp. nov., E. osculum sp. nov. and E. umbonatus sp. nov.; Castelnaudia eungella with E. savatus sp. nov.; Castelnaudia marginifera with E. labiatus sp. nov.; Castelnaudia mixta with E. mixtus sp. nov.; Castelnaudia porphyriaca with E. basiatus sp. nov., E. despoticus sp. nov. and E. teuceri sp. nov.; Castelnaudia septemcostata with E. nahmani sp. nov. and E. raveni sp. nov.; Castelnaudia setosiceps with E. hadros sp. nov.; Notonomus aurifer, N. dimorphicus, N. flos and N. spurgeoni with E. janus sp. nov.; and Notonomus transitus with E. biuncatus sp. nov. All the described species from Castelnaudia were from the ochoai species group, and the species on Notonomus were from the leytei species group. Ten additional undescribed species were also found on these hosts, all in numbers insufficient for description: nine from Castelnaudia (ochoai and pterostichi species groups) and one from Notonomus (undetermined species group). Synhospitality was common on Castelnaudia, with four species of Eutarsopolipus on C. cordata, C. eungella, C. porphyriaca and three on C. septemcostata. Co-infestation was also common, with one-third of infested beetles hosting two or more species of Eutarsopolipus. I speculate that the greater longevity and slower speciation rates of Castelnaudia have permitted more successful host-switching and speciation of its parasites.
TL;DR: Brood care by females of four 'Notonomus' species is described, the first description of such behaviour in Australian species of Carabidae and is an additional record to the few carabid species worldwide known to exhibit parental care.
Abstract: Brood care by females of four 'Notonomus' species is described. This is the first description of such behaviour in Australian species of Carabidae and is an additional record to the few carabid species worldwide known to exhibit parental care.
TL;DR: Both species readily accept larval Lepidoptera as food, are nocturnal and are the dominant carabids in their respective habitats, and the carabid communities may be used as environmental indicators.
Abstract: The distributions and life histories of two species of carabid beetles, Notonomus gravis and Notonomus philippi, are compared. N. gravis inhabits the western grassland plains of Victoria and N. philippi inhabits woodland in the Otway Ranges and areas east of Melbourne. Adults of both species show peak activity in summer after emergence, with larval development from autumn to spring. The development of N. philippi occurs approximately one month earlier than that of N. gravis. Both species readily accept larval Lepidoptera as food, are nocturnal and are the dominant carabids in their respective habitats. N. gravis has potential as a biological control agent, and the carabid communities may be used as environmental indicators.
TL;DR: The difference in respiration rates between the sexes is attributed to the maternal behaviour, and decreased surface activity, of mature females.
Abstract: The respiration rates of Notonomus gravis (Chaudoir) and N.philippi (Newman) (Coleoptera: Carabidae) were measured at temperatures between 10°C and 45°C. Mature males of both species had higher respiration rates than mature females. There was no difference between the rates of teneral male and female beetles at 30°C. The difference in respiration rates between the sexes is attributed to the maternal behaviour, and decreased surface activity, of mature females.