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

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  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...

A new species of tarantula of the genus Euathlus (Araneae: Theraphosidae) from Chile: distribution and possible threats to its conservation

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A new species of tarantula of the genus Euathlus (Araneae: Theraphosidae) from Chile: distribution and possible threats to its conservation

Abstract

We describe and illustrate a new species of tarantula of the genus Euathlus Ausserer, 1875, Euathlus walteri sp. nov. This species represents the first record for the genus in Tarapacá region, being the northernmost limit of its known distribution in Chile. Known and potential distribution are provided. Precipitations and altitude are the most important variables for its distribution. In addition, the conservation status of the new species is discussed, and it is proposed as Endangered (EN) according to IUCN criteria.

Taucare-Ríos, A., Ocares-Plaza, S., & Pérez-Miles, F. (2024, December 31). A new species of tarantula of the genus euathlus (Araneae: Theraphosidae) from Chile: Distribution and possible threats to its conservation. Gayana. https://gayana.cl/index.php/gn/article/view/369