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Description of the first stage zoea of the symmetrical hermit crab Pylocheles mortensenii (Boas, 1926) (Anomura, Paguridea, Pylochelidae)

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The first zoeal stage of the symmetrical hermit crab, Pylocheles mortensenii (Boas, 1926) is described and illustrated based on laboratory-hatched material. The development of P.mortensenii has been classified as "advanced", based on the following features: stalked eyes, mandibular palp, six abdominal somites, uropodal buds visible, and well-developed pereiopods at hatching. Reduced mouthparts and a large mass of yolk granules in the gastric area indicate a lecithotrophic development of the zoea. Long dorso-lateral spines on the abdominal somites of the zoea are unique among the larvae of the superfamily Coenobitoidea. Comparison of the larval and juvenile morphology within the family Pylochelidae revealed that the widely distributed species P. mortensenii has planktonic larvae, while the endemic Japanese genus Pomatocheles has been reported to hatch at a more advanced stage.

Le premier stade zoé du pagure symétrique, Pylocheles mortensenii (Boas, 1926) est décrit et illustré d'après des larves écloses au laboratoire. Le développement de P. mortensenii peut être classé comme "avancé" sur la base des caractères suivants: yeux pédonculés, palpe mandibulaire, six somites abdominaux, bourgeons d'uropodes visibles et péréiopodes bien développés à l'éclosion. Des pièces buccales réduites et une grosse masse de granules jaunes dans la partie gastrique indiquent un développement lécithotrophique de la zoé. Les longues épines dorso-latérales sur les somites abdominaux de la zoé sont uniques chez les larves de la super-famille Coenobitoidea. Chez les Pylochelidae, la comparaison morphologique entre les larves et les juvéniles indique que l'espèce à large distribution P. mortensenii possède des larves planctoniques tandis que chez le genre endémique japonais Pomatocheles l'éclosion a été décrite comme interventant à un stade relativement avancé.

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