Ce texte pr�sente, � partir d’observations directes, le Peltogaster et ses proches comme parasite externes des crustac�s, notamment du Pagurus et du Pa�gurus bernhardus. Il replace l’�tude dans le long d�bat scientifique sur leur nature et leur place dans l’arbre des Crustac�s, en expliquant comment les observations ont fait �voluer la classification et quelles caract�ristiques permettent de les distinguer des Lern�ides et des Cirrip�des. On d�couvre aussi la Liriope pygmaea, femelle portant des œufs et des jeunes, et on suit les descriptions des larves et des structures internes qui soutiennent l’id�e d’affinit� avec les Cirrip�des.

Descriptions concr�tes de l’apparence ext�rieure et des organes d’accrochement, et de la mani�re dont ils s’attachent � l’h�te.
D�veloppement larvaire et disposition des ovaires, avec des observations sur les saccules et la matrice �ventuelle.
Comparaisons avec Pachybdella et avec d’autres Cirrip�des, pour clarifier les liens �volutifs.
Remarques historiques sur les interpr�tations de Rathke, Steenstrup et Dana et leurs implications.

Ce livre s’adresse aux lecteurs int�ress�s par la biologie des parasites crustac�s, la nomenclature et l’�volution des crustac�s parasites, et � ceux qui veulent comprendre comment les observations de terrain �clairent la classification.
Ideal pour les passionn�s de zoologie et d’histoire des sciences qui souhaitent appr�hender, sans jargon inutile, la nature complexe des relations parasite-h�te et l’�volution des id�es sur Peltogaster et ses proches.

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