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...

The first record of Dictis L. Koch, 1872 (Araneae, Scytodidae) in the Caucasus

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The first record of Dictis L. Koch, 1872 (Araneae, Scytodidae) in the Caucasus

Abstract

Dictis L. Koch, 1875, is recorded in the Caucasus for the first time. Dictis strandi (Spassky, 1941), comb. nov. is transferred to Dictis from Scytodes Latreille, 1804 based on the examined female and two males raised to maturity from the egg sac. Collecting data and digital photos of live and preserved specimens are provided, along with detailed descriptions of both sexes, diagnostic illustrations, and observations on the natural history of Dictis strandi comb. nov. The endogyne is depicted for the first time.

Seropian A (2024) The first record of Dictis L. Koch, 1872 (Araneae, Scytodidae) in the Caucasus. Caucasiana 3: 215-221. https://doi.org/10.3897/caucasiana.3.e138762