New Insight Into the Evolutionary Arms Race Between Spider Egg Sac Pseudoparasitoids and Active Maternal Care by the Spiders

Posted by
  New Insight Into the Evolutionary Arms Race Between Spider Egg Sac Pseudoparasitoids and Active Maternal Care by the Spiders ABSTRACT Pseudoparasitoids can lead to high mortality in spider egg sacs, and in some cases, they reduce the reproductive success of a spider female to zero. On the other hand, a species that develops within the spider's egg sac uses a limited resource derived from a single egg sac for its larval development. Therefore, the most crucial behaviour that increases the fitness of free-living pseudoparasitoid females is choosing the best host for their offspring. We analysed various points of the counter-adaptations of the spider egg sac pseudoparasitoid and spiders exhibiting active maternal care, utilising the ichneumonid  Hidryta fusiventris  (Thomson, 1873) and the wolf spider  Pardosa lugubris  (Walckenaer, 1802). We showed that the oviposition decision of  H. fusiventris  is based on the spider's egg sac size and that the fema...

New Contributions to the Study of Spiders (Arachnida, Araneae) in Badajoz (Extremadura, Spain)

Posted by

 


New Contributions to the Study of Spiders (Arachnida, Araneae) in Badajoz (Extremadura, Spain) 

Abstract

This study expands the knowledge of the spider fauna in the province of Badajoz (Extremadura), a region in which this group remains largely unexplored. A total of 160 individuals were captured and identified, belonging to 22 families, 47 genera, and 54 species. Of these, 33 represent new records for the province, and 20 also constitute the first records for the autonomous community of Extremadura, raising the total number of recorded species in Badajoz to 128. 

Cendrero, J., Narro-Martín, A. J., Mora-Rubio, C. & Parejo-Pulido, D. (2025). Nuevas aportaciones al conocimiento de las arañas (Arachnida, Araneae) de la provincia de Badajoz (Extremadura, España). Revista Ibérica de Aracnología 46: 117-122. [publ. end of July]