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ÉTUDE D'UNE FORME NOUVELLE. PAUCAHIRSUTA, DE L'ESPÈCE JAERA (ALBIFRONS) PRAEHIRSUTA (ISOPODES ASELLOTES)

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SUMMARY The species praehirsuta of the superspecies Jaera albifrons Leach is repre- sented in Luc-sur-Mer (Calvados) by a new form, called paucahirsuta; this form mainly differs from that which lives in Brittany (form hirsuta), by the less thickness of its anterior pereiopods and by their lower number of spécial setae. The qualitative description of paucahirsuta is accompanied by biometrical and ecological informations eoncerning the population of Luc-sur-Mer. The form paucahirsuta, which is also to be found on the Finnish coasts, may constitute a subspecies of the species praehirsuta; its phylogenetical links with the species forsmani hâve to be determined.

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