The life cycle of Catablema vesicarium (A. Agassiz, 1862) (Hydrozoa, Pandeidae)статья
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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
Аннотация:The hydrozoan classification systems often rely
on limited character sets of either polyp or medusa stages,
and these classifications stay non-consistent in many cases
because of lack of life cycle data. This is usual for
hydrozoans with tiny inconspicuous colonies and intermittent
medusae production period such as pandeid in the
polar latitudes. In this study, the previously unknown life
cycle of boreal-Arctic pandeid hydrozoan Catablema
vesicarium was elucidated under experimental conditions.
Medusae C. vesicarium were found near the Pertsov Biological
Station in the White Sea and maintained in a laboratory
till spawning. Morphological descriptions of
development stages including medusae, eggs, planulae,
polyps, and medusae buds are represented. Hydroid C.
vesicarium was also collected on the shell with live Astarte
elliptica. Identification of this colony was confirmed by
comparing the sequences of the mitochondrial CO1, 16S,
and nuclear 18S-ITS1-5.8S gene fragments of medusae and
polyps. Hydroids C. vesicarium have almost sessile polyps
with perisarc cup only at the base, and newborn medusae
have rudimentary marginal bulbs which alternate with four
marginal tentacles. Identification characters of the cultivated
hydrozoan are discussed in comparison with other
known pandeids. The data on temperature range of medusae appearing in experiments may be potentially
useful for studying seasonality of jellyfish in the sea.