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Some Data On the Phenology and the Activity-Patterns of Nemastoma Lugubre (Müller) and Mitostoma Chrysomelas (Hermann) (Nemastomatidae, Opilionida, Arachnida)

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Some aspects of the ecology of Nemastoma lugubre (Müller) and Mitostoma chrysomelas (Hermann) have been studied in the Northern part of the Netherlands. 1. The life histories of the species show clear differences. N. lugubre overwinters in the egg-stage, whereas M. chrysomelas overwinters in the juvenile stage. 2. M. chrysomelas appears to be mostly active in the field layer, whereas N. lugubre inhabits the litter layer. 3. The phenology as well as the pattern of activity appear to be dependent on climatic conditions. Thus, in comparison with S. England, the life history is different and the period of activity of N. lugubre in the Netherlands is later. 4. In N. lugubre the activity of the sexes is not clearly synchronized. Females reach peak numbers in September, whereas the maximum number of sexually active males is found in October. 5. Sexual activity in males can be assessed by recording the presence of secretion on the cheliceres. In N. lugubre sexual activity in males is maximal during October.

Affiliations: 1: Department of Biology, Free University, Amsterdam, The Netherlands


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