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The phylogenetic development of brooding behaviour in the hirudinea

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Summary

Within the Clitellata the habit of brooding the eggs and offspring is known only in the Glossiphoniidae, suggesting that the habit probably arose de novo in that family. Within extant glossiphoniids, the degree of protection given to the offspring can be arranged in a continuous series of increasing complexity, which may approximate the phylogenetic development of the behaviour culminating with a well developed brood pouch in Marsupiobdella. Further analysis of this brooding behaviour may shed light on the relationships of the higher categories of the Hirudinea. Brooding, which may have been derived from the habit of ventilating newly laid cocoons, known in some erpobdellids, probably evolved as a mechanism for increased survival of the offspring by protecting the offspring from heavy predation.

Resume

Chez la Clitellata l'habitude de couver les oeufs et les petits n'est connue que chez la Glossiphoniidae, ce qui suggère que l'habitude s'est probablement produite de novo dans cette famille. Chez les glossiphoniids la mesure de protection accordée aux petits peut s'arranger dans une série continue de complexité croissante, qui peut se rapprocher de la développement phylogénétique de l'habitude, se culminent en une poche ventrale chez le Marsupiobdella. Une analyse de cette habitude de couver les oeufs et les petits pourrait peut-être éclairer les parentés des genres des hirudinées. Cette habitude, qui peut avoir développé de l'habitude de ventiler les cocons récemment pondus, connue chez quelques erpobdellids, a probablement évolvé comme un méchanisme qui produirait une plus grande survie chez les petits en les protégant de la prédation sévère.

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Sawyer, R.T. The phylogenetic development of brooding behaviour in the hirudinea. Hydrobiologia 37, 197–204 (1971). https://doi.org/10.1007/BF00015567

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