The (not very) typical protonymphons of Pycnogonum litorale

Nina Alexeeva, Yuta Tamberg, Natalia Shunatova

Результат исследований: Научные публикации в периодических изданияхстатья

Выдержка

Sea spiders are unique and poorly known marine chelicerates. Their larvae are even less studied, especially at the ultrastructural level. Here, we examined the hatchlings of Pycnogonum litorale (Strøm, 1,762) using histology, SEM and TEM. Existing classifications place these larvae among “typical” protonymphons, together with Nymphon brevirostre. Our results, however, revealed major differences between the two species. Hatchlings of P. litorale are endotrophic for 1–2 weeks, with yolk deposits in the body wall and a reduced secretory apparatus. They lack a body cavity, demonstrate an unusual modification of the midgut sheath cells and a complex subesophageal ganglion, which includes neuromeres of the prospective walking legs 1. These larvae also possess well-developed glia and complex sensory structures: eyes, V-shaped mechanoreceptive bristles, integrated chemo- and mechanoreceptors, and three types of concealed mechanoreceptors embedded into the body wall and only seen on the sections. In this paper we also propose a new interpretation of the pycnogonid larval types: we present a set of traits useful for diagnosis and a preliminary classification. Finally, we discuss the complexity of glial types in sea spiders and other arthropods.

Язык оригиналаанглийский
Страницы (с-по)1370-1392
Число страниц23
ЖурналJournal of Morphology
Том280
Номер выпуска9
DOI
СостояниеОпубликовано - 1 янв 2019

Отпечаток

Pycnogonida
Larva
mechanoreceptors
Mechanoreceptors
Spiders
integument
Neuroglia
Oceans and Seas
larvae
taxonomy
subesophageal ganglia
body cavities
chemoreceptors
Arthropods
setae (animal)
neuroglia
midgut
Ganglia
walking
histology

Предметные области Scopus

  • Зоология и животноводство
  • Биология развития

Цитировать

Alexeeva, Nina ; Tamberg, Yuta ; Shunatova, Natalia. / The (not very) typical protonymphons of Pycnogonum litorale. В: Journal of Morphology. 2019 ; Том 280, № 9. стр. 1370-1392.
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The (not very) typical protonymphons of Pycnogonum litorale. / Alexeeva, Nina; Tamberg, Yuta; Shunatova, Natalia.

В: Journal of Morphology, Том 280, № 9, 01.01.2019, стр. 1370-1392.

Результат исследований: Научные публикации в периодических изданияхстатья

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