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The "Mexican dancer" in Ecuador: molecular confirmation, embryology and planktotrophy in the sea slug Elysia diomedea.
Moreano-Arrobo, Lola; Pérez, Oscar D; Brown, Federico D; Oyarzún, Fernanda X; Canales-Aguirre, Cristian B.
Afiliação
  • Moreano-Arrobo L; Laboratorio de Biología del Desarrollo 113, Escuela de Ciencias Biológicas, Pontificia Universidad Católica del Ecuador, Ecuador.
Int J Dev Biol ; 65(4-5-6): 323-332, 2021.
Article em En | MEDLINE | ID: mdl-32930357
Elysia diomedea, otherwise known as the "Mexican dancer", aries in adult size and color across its geographical distribution in Ecuador. Because of morphological variation and the absence of genetic information for this species in Ecuador, we analyzed mtDNA sequences in three populations (Ballenita, La Cabuya, and Mompiche) and confirmed that individuals from the three locations belonged to E. diomedea and that there was no population structure that could explain their morphological differences. Next, we analyzed general aspects about the reproductive biology and embryology of this species. Live slugs from the Ballenita population were maintained and reproduced ex situ. Egg ribbons and embryos were fixed and observed by brightfield and confocal microscopy. We observed a single embryo per capsule, 98 embryos per mm2 of egg ribbon, and compared the cleavage pattern of this species to that of other heterobranchs and spiralians. E. diomedea early development was characterized by a slight unequal first cleavage, occurrence of a 3-cell stage in the second cleavage, and the formation of an enlarged second quartet of micromeres. We observed clear yolk bodies in the egg capsules of some eggs ribbons at early stages of development. Both reproductive and embryological characteristics, such as presence of stomodeum in the larva, and ingestion of particles after hatching confirmed the planktotrophic veliger larvae of this species, consistent with the majority of sacoglossans from the Eastern and Northeast Pacific Oceans.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Gastrópodes Limite: Animals País/Região como assunto: America do sul / Ecuador / Mexico Idioma: En Revista: Int J Dev Biol Assunto da revista: BIOLOGIA / EMBRIOLOGIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Equador

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Gastrópodes Limite: Animals País/Região como assunto: America do sul / Ecuador / Mexico Idioma: En Revista: Int J Dev Biol Assunto da revista: BIOLOGIA / EMBRIOLOGIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Equador