Development of ciliary bands in larvae of the living isocrinid sea lily Metacrinus rotundus

Shonan Amemiya, Taku Hibino, Hiroaki Nakano, Masaaki Yamaguchi, Ritsu Kuraishi, Masato Kiyomoto

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Embryos and larvae of an isocrinid sea lily, Metacrinus rotundus, are described by scanning electron microscopy. Around hatching (35 h after fertilization), the outer surface of the gastrula becomes ubiquitously covered with short cilia. At 40 h, the hatched swimming embryo develops a cilia-free zone of ectoderm on the ventral side. By 3 days, the very early dipleurula larva develops a cilia-free zone ventrally, densely ciliated regions laterally, and a sparsely ciliated region dorsally. At this stage, the posterior and anterior ciliary bands first appear: the former runs along a low ridge separating the densely from the sparsely ciliated epidermal regions, while the latter is visible, at first discontinuously, along the boundary between the densely ciliated lateral regions and the cilia-free ventral zone. In the late dipleurula larva (5 days after fertilization), the anterior and posterior loops of ciliary bands are well defined. The transition from the dipleurula to the semidoliolaria larva occurs at 6 days as the posterior loop becomes rearranged to form incompletely circumferential ciliary bands. The larva becomes competent to settle at this stage. The arrangement of the ciliary bands on the semidoliolaria is maintained during the second week of development, while the larva retains its competence to settle. The larval ciliary patterns described here are compared with those of stalkless crinoids and eleutherozoan echinoderms. The closest morphological similarities are between M. rotundus and the basal eleutherozoan class Asteroidea.

Original languageEnglish
Pages (from-to)36-43
Number of pages8
JournalActa Zoologica
Volume96
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

Crinoidea
Lilium
Oceans and Seas
Larva
Cilia
cilia
larva
larvae
fertilization (reproduction)
Fertilization
embryo
embryo (animal)
Embryonic Structures
Gastrula
Ectoderm
echinoderm
Asteroidea
Echinodermata
Electron Scanning Microscopy
Mental Competency

Keywords

  • Metacrinus rotundus
  • Articulata
  • Ciliary band
  • Crinoid
  • Dipleurula
  • Doliolaria
  • Echinoderm
  • Isocrinid
  • Scanning electron microscopy
  • Sea lily

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology
  • Cell Biology

Cite this

Development of ciliary bands in larvae of the living isocrinid sea lily Metacrinus rotundus. / Amemiya, Shonan; Hibino, Taku; Nakano, Hiroaki; Yamaguchi, Masaaki; Kuraishi, Ritsu; Kiyomoto, Masato.

In: Acta Zoologica, Vol. 96, No. 1, 01.01.2015, p. 36-43.

Research output: Contribution to journalArticle

Amemiya, Shonan ; Hibino, Taku ; Nakano, Hiroaki ; Yamaguchi, Masaaki ; Kuraishi, Ritsu ; Kiyomoto, Masato. / Development of ciliary bands in larvae of the living isocrinid sea lily Metacrinus rotundus. In: Acta Zoologica. 2015 ; Vol. 96, No. 1. pp. 36-43.
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