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American Focus > Blog > Tech and Science > Mystery of Spiders’ Sense of Smell May Finally Be Solved in New Study : ScienceAlert
Tech and Science

Mystery of Spiders’ Sense of Smell May Finally Be Solved in New Study : ScienceAlert

Last updated: January 8, 2025 11:12 am
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Mystery of Spiders’ Sense of Smell May Finally Be Solved in New Study : ScienceAlert
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Spiders, despite being common creatures that have lived alongside humans for centuries, still hold many mysteries. One such mystery was how spiders detect smells, a question that researchers have recently uncovered the answer to.

In a groundbreaking study published in the Proceedings of the National Academy of Sciences, researchers revealed that male spiders utilize olfactory hairs known as wall-pore sensilla on their legs to detect the sex pheromones released by female spiders. This discovery marks the end of a decade-long search for these elusive sensilla and opens up new avenues for studying spiders’ sense of smell in-depth.

While spiders are known for their vibration sense and exceptional vision in certain species like jumping spiders, little was known about their olfactory capabilities. Previous studies had raised questions about how spiders detect odors without antennae like insects and the absence of wall-pore sensilla, which are crucial for insects’ sense of smell.

The researchers of this study identified and mapped wall-pore sensilla on the legs of male wasp spiders (Argiope bruennichi) and demonstrated their high sensitivity in detecting airborne sex pheromones. These sensilla were found to be prevalent across the spider tree of life, indicating their widespread presence in various species.

Using high-resolution scanning electron microscopy, the researchers examined male and female A. bruennichi spiders and discovered thousands of wall-pore sensilla on the legs of male spiders. These sensilla were unique in structure compared to those found in insects and other arthropods, hinting at their specialized function in olfaction.

Further experiments revealed that wall-pore sensilla specifically responded to the pheromone compound released by female spiders, showing remarkable sensitivity even to minute amounts of the compound. This sensitivity enables male spiders to detect faint traces of sex pheromones in the air, facilitating mate searching and recognition.

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The study also explored the presence of wall-pore sensilla in 19 additional spider species across the spider tree of life, finding that these sensilla were specific to males and absent in certain basal spider groups. This discovery sheds light on the evolution and diversity of olfactory mechanisms in spiders.

The findings of this research pave the way for future investigations into how spiders perceive the world through olfaction, raising intriguing questions about female spider olfaction, detection of other chemicals, molecular and neural basis of olfaction, and evolution of olfactory senses in spider species.

Overall, this study marks a significant advancement in our understanding of spider biology and sets the stage for exciting new discoveries in the field of sensory biology.

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