POLYMORPHISM IN FREE-SWIMMING LARVAE OF HALISARCA DUJARDINI (DEMOSPONGIAE, HALISARCIDA)

Autori

  • ELISAVETA L. GONOBOBLEVA
  • ALEXANDER V. ERESKOVSKY

Abstract

This paper discusses the embryonic development of Halisarca dujardini Johnston, 1842 (Demospongiae, Halisarcida). Different morphotypes of free-swimming larvae are formed: parenchymella-like, coeloblastula-like larvae and disphaerulae larvae. Larvae with different morphological characters may develop in the same parent and remain morphologically distinct until metamorphosis. We have identified a number of characters that emerge during embryogenesis, determined the developmental stage when they emerge as well as possible morphogenetical processes causing their variability. The complexity of morphogenesis in H. dujardini is indicative of the low level of determination that occurs during embryogenesis.

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Pubblicato

2018-05-23

Fascicolo

V. 68 (2004): Sponge Science in the new Millennium “Papers contributed to the VI International Sponge Conference“ Rapallo (Italy) 29th September - 5th October 2002

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