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Recientemente se ha notificado el uso de telarañas abandonadas como sustrato de ovoposición para Chrysopidae, sin embargo, hasta ahora este comportamiento nunca se había observado en una telaraña activa (es decir, no abandonada). En julio de 2020, se encontró un racimo de huevos de Chrysopidae pegados al exterior de una red activa de Steatoda nobilis en Inca, Mallorca (Islas Baleares, España). Esta especie de araña es diferente de las citadas hasta ahora en la literatura con huevos de Chrysopidae en sus redes. Se discuten las implicaciones biológicas de este comportamiento poco estudiado.

Background:Opisthorchis felineus and Metorchis bilis are trematodes that cause opisthorchiasis and metorchiasis, respectively. The freshwater snails Bithynia hispanica and B. tentaculata are the respective intermediate hosts for these parasites in the Iberian Peninsula, where both parasites are present. Methods:To study the distribution of these snail species, an exhaustive literature review and revision of museum collections was performed. Results:A total of 370 localities were compiled and mapped. B. tentaculata were found throughout the Iberian Peninsula, both in Spain and Portugal, while B. hispanica was found only in the Mediterranean coast of Spain. Conclusion:Knowing the distribution of the Bithynia species found in the Iberian Peninsula is highlighted in terms of public health, as the presence of the snail is related to the presence of the disease and can be used as a tool to face future outbreaks.