The morphology of the immature stages of two rare Lixus species (Coleoptera, Curculionidae, Lixinae) and notes on their biology
نویسندگان
چکیده
The mature larvae and pupae of Lixus (Ortholixus) bituberculatus Smreczyński, 1968 and Lixus (Dilixellus) neglectus Fremuth, 1983 (Curculionidae: Lixinae: Lixini) are described and compared with known larvae of 21 other Lixus and 2 Hypolixus taxa. The mature larva and pupa of Lixus bituberculatus are the first immature stages described representing the subgenus Ortholixus. The larva of Lixus neglectus, in the subgenus Dilixellus, is distinguished from the known larvae of four species in this subgenus by having more pigmented sclerites on the larval body. All descriptions of mature larvae from the tribe Lixini, as do all known species from the tribe Cleonini, fit the diagnosis of the mature larva of the Lixinae subfamily. Furthermore, new biological information of these species in the Czech Republic, Slovakia and Romania is provided. For Lixus bituberculatus, a chicory, Cichorium intybus L. (Asteraceae), is identified as a host plant, and Lixus neglectus is found on dock Rumex thyrsiflorus Fingerh. (Polygonaceae). Both species are probably monophagous or oligophagous. Adults of Lixus bituberculatus often inhabit host plants growing in active, dry and sunny pastures with sparse patches without vegetation, being mostly active during the night in April/May and then again in September, when the highest activity levels are observed. Adults of Lixus neglectus inhabit dry grasslands on sandy soils with host plants, being active during the day from May to September, with the highest level of activity in May/June and September. The larvae of both species are borers in the stem and root of the host plant, and they pupate in root or root neck. Adults leave the pupation cells at the end of summer and do not hibernate in the host plants. Finally, Romania is a new geographic record for Lixus bituberculatus.
منابع مشابه
Biology and morphology of immature stages of Lixus canescens (Coleoptera: Curculionidae: Lixinae).
Mature larvae and pupae of Lixus (Eulixus) canescens Steven, 1829 (Curculionidae: Lixinae: Lixini) are described and compared with known larvae and pupae of other Lixus species. The biology of the species was studied in Ukraine. A species of Crambe (Brassicaceae) was identified as host plant of both larvae and adults of this weevil. The weevil is very likely oligophagous. Lixus canescens prefer...
متن کاملDescriptions of immature stages of the weevil Lixus punctiventris Boheman, 1835 (Coleoptera, Curculionidae, Lixini).
Last instar larva of Lixus punctiventris Boheman is redescribed and illustrated, its pupa is described and illustrated for the first time. Biology of this species is analyzed in association with larval morphology and feeding habits. Overall larval and pupal morphological diagnoses of the genus Lixus and larval diagnosis of the tribe Lixini are updated.
متن کاملDescription of the immature stages of Larinus vulpes and notes on its biology (Coleoptera, Curculionidae, Lixinae)
Mature larva and pupa of Larinus vulpes (Olivier, 1807) (Curculionidae: Lixinae: Lixini) are morphologically described for the first time and compared with known larvae and pupae of other Larinus species. Very high counts of larval body setae (pronotum with more than 25 setae and postdorsum on meso- and metathorax and also on abdominal segments I-VII with more than 12 setae) are characteristic ...
متن کاملBiology and morphology of immature stages of Adosomus roridus (Coleoptera: Curculionidae: Lixinae).
Mature larva and pupa of Adosomus (s. str.) roridus (Pallas, 1781) (Curculionidae: Lixinae: Cleonini) are described and compared with ten other taxa of Cleonini with known larvae. This weevil is an oligophagous species on the Asteraceae family. From our observations in Slovakia, we found active adults from April to September in dry sunny places within extensively used or fallow vineyards and in...
متن کاملLIFE HISTORY, BEHAVIOR AND MORPHOLOGY OF THE IMMATURE STAGES OF ENOCHRUS QUADRIPUNCTATUS HERBST IN THE LABORATORY (COLEOPTERA: HY DROPHILIDAE) 11- MORPHOLOGY
The life history, behavior and morphology of the immature stages of Enochrus quadripunctatus Herbst from Iran are studied. The results of the work on the life history and behavior of this species in the immature stages and as newly-emerged adults have been presented as part I. The morphology of the egg cases, larvae, pupae, and the male genitalia of the adult is covered in the present work....
متن کامل