Walking leg regeneration in the sea spider Nymphon brevirostre Hodge, 1863 (Pycnogonida)статья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:Regeneration is widespread across all animal taxa, but patterns of its distribution and key factorsdetermining regeneration capabilities stay enigmatic. A comparative approach could shed light on theproblem, but its efficacy is limited by the fact that data is only available on a few species from derivedtaxa. Pycnogonida are nested basally within the Chelicerata. They can shed and replace their walking legsand have a high regeneration capacity. In this work, we carried careful observation on leg appendotomyand regeneration processes in a sea spider under laboratory settings. The limb structure and in vivoobservation reveal autotomy as the most likely appendotomy mechanism. High regeneration capabilitieswere ascertained: an anatomically normal but small leg appeared in a single molting cycle and the fullfunctionality regained in 2e3 cycles. Wound closure after appendotomy in N. brevirostre primarily relieson hemolymph coagulation, which apparently differs from both xiphosurans and crustaceans. Regenerationis provided by proliferation in the leg cutpiece. Regenerative morphogenesis resembles thenormal ontogenetic morphogenesis of a walking leg, but accelerated. Unlike in most arthropods, inN. brevirostre, regeneration does not necessarily correspond to the molting cycle, inferring a plesiomorphicstate.