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This image will accompany an article discussing the unique mating behaviours of three taxa of invertebrates - Collembola ( Symphypleona ), Thysanura and Archaeognata.

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Question: Collembola (Symphypleona), Thysanura & Archaeognata have unique mating behaviours. Compare the process of fertilisation/mating in these three taxa

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Collembola (Symphypleona), Thysanura, and Archaeognata are all unique in their mating and fertilization processes. Here, we'll examine the differences among these three taxa. 1. Collembola (Symphypleona): Symphypleona is a subgroup of Collembola or springtails, which are hexapod creatures that are closely related to insects. Mating in springtails is unique in that it often does not involve direct physical contact between males and females. Male springtails produce a sperm packet called a spermatophore, which they deposit on the substrate or on a thread of silk. Afterward, they engage in courtship behaviors to attract a female, such as tapping, headbutting, or even producing a silk "bridal veil" in some species. Once a female arrives and the male is certain she has detected the spermatophore, the male often retreats. The female then moves over the spermatophore and picks it up with her genital opening, ensuring successful fertilization. 2. Thysanura: Thysanura, also known as Zygentoma, are a group of primitive insects, commonly known as silverfish or fishmoths. They have an indirect method of mating, which also involves the use of spermatophores. The male silverfish deposits a spermatophore on the ground or on a silk thread and starts displaying courtship behaviors such as antennal contact, tapping, and chasing. The male and female then stand in a face-to-face position, often moving their antennae and bodies rhythmically. This action can continue for several minutes or even hours. Finally, the female moves her ovipositor over the spermatophore and picks it up to fertilize her eggs. 3. Archaeognata: Archaeognata, or bristletails, are another group of ancient wingless insects. Like the previous two taxa, Archaeognata also use spermatophores for indirect mating. The male bristletail deposits a spermatophore on the ground and then performs a series of courtship behaviors like body vibrations, jerking movements, and antennal contact. The female responds by touching the male's antennae or cerci (appendages at the end of the abdomen) and then moving over the spermatophore, picking it up with her ovipositor to fertilize her eggs. In summary, while all three taxa – Collembola (Symphypleona), Thysanura, and Archaeognata – have unique mating behaviors, they share the common characteristic of using spermatophores for indirect fertilization. The specific courtship rituals and behaviors, as well as certain anatomical features, distinguish them from each other.

Answered by gpt-4

April 26, 2023, 5:38 a.m.

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Published: Wednesday, April 26, 2023

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