Mother-young cohabitation in Phronimella elongata and Phronima spp. (Amphipoda, Hyperiidea, Phronimidae)

Masakazu N. Aoki, Chie Matsumoto-Ohshima, Euichi Hirose, Jun Nishikawa

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Reproductive characteristics of poorly studied hyperiid amphipods, especially Phronimella elongata, are described. Among nine species of hand-collected phronimids, females of Phronimella elongata, Phronima dunbari and Phronima sedentaria cohabited with their young in a 'barrel' derived from gelatinous zooplankton. Five growth stages of young were identified in Phronimella elongata: young of stages I-IV were found with the mother in the barrel, but stage-V young clinged to the mother retaining no barrel. The cohabiting young in Phronimella elongata and Phronima sedentaria always consisted of single growth stage. In a single female of Phronima dunbari, however, two different stages of young coexisted in a barrel. In Phronimella elongata, the mother size significantly correlated with the number of brooded eggs or cohabiting young regardless of growth stages of young. Considerable variation in the number of eggs or young per female among phronimid species may attribute to the differences in the volumes of the brood pouches.

Original languageEnglish
Pages (from-to)1553-1556
Number of pages4
JournalJournal of the Marine Biological Association of the United Kingdom
Issue number6
Publication statusPublished - 2013 Sept
Externally publishedYes


  • barrel
  • hand-collection
  • maternal care
  • mother-young cohabitation
  • phronimid amphipods

ASJC Scopus subject areas

  • Aquatic Science


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