𝐓𝐚𝐫𝐚𝐧𝐭𝐮𝐥𝐚 𝐫𝐞𝐠𝐞𝐧𝐞𝐫𝐚𝐭𝐢𝐯𝐞 𝐩𝐨𝐰𝐞𝐫𝐬: ⁣
When the spider decides it’s time to lose a leg, it jerks the coxa up, causing a pressure tear in the membrane between the coxa and trochanter. A muscle running into the leg from the coxa separates from the trochanter and snaps back into the coxa. Other muscles attached to a thickened areas on the margins of the interior of the coxa on the joint membrane pull toward each other, closing the wound opening. Blood pressure makes the joint membrane bulge outward, which also aids in closing the wound. Bonnet (1930) claimed that an autotomized leg will only be regenerated if it is lost in the first quarter of the intermolt period. This may or may not be true for most spiders, but probably is not be appropriate for tarantulas. Too many cases of regeneration have been reported when the tarantula was clearly past the first quarter of an intermolt period. After autonomy, a complete, new leg forms in the old coxal cavity. There’s little space in the coxa, so the new leg is extremely folded and compacted internally. After the next molt, the new complete leg will be smaller and thinner than the old leg until the next molt, or the one after that. With tarantulas, how much smaller is highly variable. Some new legs come out nearly the length and girth of the lost leg. Others may be as small as a third the size or less of the lost leg. In this time-lapse of my phormictopus cancerides (Hispaniolan giant tarantula) juvenile ♂️ molting, we can observe the regeneration of its limbs 🤓 ⁣

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