First ultrastructural evidence of placental nutrition in a ctenostome bryozoan: example of Amathia verticillata

Thomas Schwaha, M. Moosbrugger, M.G. Walzl, A.N. Ostrovsky

Результат исследований: Научные публикации в периодических изданияхстатья

1 цитирование (Scopus)

Выдержка

Matrotrophy and its most advanced mode—placentation—is a masterpiece of nature contributing to offspring fitness. It has been studied mainly in vertebrates, whereas so-called placental analogues in invertebrates are poorly known. Here we use an ultrastructural approach to report the first evidence of placentation in the ctenostome bryozoan Amathia verticillata. This marine colonial suspension-feeder incubates its progeny in the tentacle sheath, which is transformed into a brood chamber. When the fertilized egg is deposited into the brood cavity, the tentacle sheath wall, originally consisting of flattened epithelial cells, is modified into an embryophore (placental analogue) via cell multiplication and hypertrophy. The embryophore (nutritive) cells develop a massive secretory apparatus and acquire ‘microvillous’ apical membranes indicating the presence of exocytosis. In turn, the embryo surface cells also form a complex network of irregular projections and foldings. Coated pits beneath this network indicate active endocytosis. The developing embryo is adjacent to the embryophore and the narrow slit between them is filled with dense and flocculent (presumably nutritive) material. The embryo increases up to 24-fold in size indicating substantial matrotrophic provisioning. We compare the ultrastructural details of placentation in A. verticillata with those known in cheilostome bryozoans, and review the major structural principles of placentation in Bryozoa in general. We then discuss possible ways of nutrient transport to the embryophore in various bryozoan clades.
Язык оригиналаанглийский
Страницы (с-по)221-232
Число страниц12
ЖурналZoomorphology
Том138
Номер выпуска2
DOI
СостояниеОпубликовано - 2019

Отпечаток

Placentation
embryo (animal)
Embryonic Structures
Bryozoa
nutrition
nutrient transport
exocytosis
Zygote
Exocytosis
endocytosis
cells
Invertebrates
Endocytosis
hypertrophy
Hypertrophy
Vertebrates
Suspensions
epithelial cells
Epithelial Cells
invertebrates

Предметные области Scopus

  • Зоология и животноводство
  • Биология развития

Цитировать

Schwaha, Thomas ; Moosbrugger, M. ; Walzl, M.G. ; Ostrovsky, A.N. / First ultrastructural evidence of placental nutrition in a ctenostome bryozoan: example of Amathia verticillata. В: Zoomorphology. 2019 ; Том 138, № 2. стр. 221-232.
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abstract = "Matrotrophy and its most advanced mode—placentation—is a masterpiece of nature contributing to offspring fitness. It has been studied mainly in vertebrates, whereas so-called placental analogues in invertebrates are poorly known. Here we use an ultrastructural approach to report the first evidence of placentation in the ctenostome bryozoan Amathia verticillata. This marine colonial suspension-feeder incubates its progeny in the tentacle sheath, which is transformed into a brood chamber. When the fertilized egg is deposited into the brood cavity, the tentacle sheath wall, originally consisting of flattened epithelial cells, is modified into an embryophore (placental analogue) via cell multiplication and hypertrophy. The embryophore (nutritive) cells develop a massive secretory apparatus and acquire ‘microvillous’ apical membranes indicating the presence of exocytosis. In turn, the embryo surface cells also form a complex network of irregular projections and foldings. Coated pits beneath this network indicate active endocytosis. The developing embryo is adjacent to the embryophore and the narrow slit between them is filled with dense and flocculent (presumably nutritive) material. The embryo increases up to 24-fold in size indicating substantial matrotrophic provisioning. We compare the ultrastructural details of placentation in A. verticillata with those known in cheilostome bryozoans, and review the major structural principles of placentation in Bryozoa in general. We then discuss possible ways of nutrient transport to the embryophore in various bryozoan clades.",
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First ultrastructural evidence of placental nutrition in a ctenostome bryozoan: example of Amathia verticillata. / Schwaha, Thomas; Moosbrugger, M.; Walzl, M.G.; Ostrovsky, A.N.

В: Zoomorphology, Том 138, № 2, 2019, стр. 221-232.

Результат исследований: Научные публикации в периодических изданияхстатья

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AU - Moosbrugger, M.

AU - Walzl, M.G.

AU - Ostrovsky, A.N.

PY - 2019

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AB - Matrotrophy and its most advanced mode—placentation—is a masterpiece of nature contributing to offspring fitness. It has been studied mainly in vertebrates, whereas so-called placental analogues in invertebrates are poorly known. Here we use an ultrastructural approach to report the first evidence of placentation in the ctenostome bryozoan Amathia verticillata. This marine colonial suspension-feeder incubates its progeny in the tentacle sheath, which is transformed into a brood chamber. When the fertilized egg is deposited into the brood cavity, the tentacle sheath wall, originally consisting of flattened epithelial cells, is modified into an embryophore (placental analogue) via cell multiplication and hypertrophy. The embryophore (nutritive) cells develop a massive secretory apparatus and acquire ‘microvillous’ apical membranes indicating the presence of exocytosis. In turn, the embryo surface cells also form a complex network of irregular projections and foldings. Coated pits beneath this network indicate active endocytosis. The developing embryo is adjacent to the embryophore and the narrow slit between them is filled with dense and flocculent (presumably nutritive) material. The embryo increases up to 24-fold in size indicating substantial matrotrophic provisioning. We compare the ultrastructural details of placentation in A. verticillata with those known in cheilostome bryozoans, and review the major structural principles of placentation in Bryozoa in general. We then discuss possible ways of nutrient transport to the embryophore in various bryozoan clades.

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KW - Vesicularioidea

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KW - REPRODUCTIVE PATTERNS

KW - GAMETOGENESIS

KW - VIVIPARITY

KW - ANATOMY

KW - SEXUAL REPRODUCTION

KW - ORIGIN

KW - EVOLUTION

KW - CHEILOSTOMATA

KW - MORPHOLOGY

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U2 - 10.1007/s00435-019-00438-4

DO - 10.1007/s00435-019-00438-4

M3 - Article

VL - 138

SP - 221

EP - 232

JO - Zoomorphology

JF - Zoomorphology

SN - 0340-6725

IS - 2

ER -