Larval Myogenesis in the Articulate Brachiopod Argyrotheca cordata (Risso, 1826)
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- Abstract
Submitted manuscript, 11.9 KB, PDF document
Brachiopoda is a metazoan phylum with a fossil record dating back to
the lower Cambrium and comprises over 12,000 extinct and 400 recent
species. Despite some recent progress using mainly palaeontological and
molecular datasets, the discussion concerning the phylogenetic position
of Brachiopoda remains unsettled. While some classic analyses employing
morphological data assign Brachiopoda to Deuterostomia, recent molecular
data propose a sister group relationship of Spiralia to a clade
Lophophorata that unites Brachiopoda, Ectoprocta, and Phoronida. To
contribute new developmental and micromorphological data to this
debate, we investigated muscle formation in larvae of the brooding articulate
brachiopod Argyrotheca cordata using immunocytochemistry combined
with confocal laser scanning microscopy. Full grown larvae are
three-lobed and show two pairs of bristle bundles. During larval development,
the first anlagen of the musculature develop in the bristle pouches
and the pedicle lobe. Late stage larvae show a network of longitudinal
muscles running from the apical to the pedicle lobe as well as transversal
muscles situated in the apical lobe. Strong muscles attach to both the
bristles and the pedicle lobe. Our work reveals only few similarities
between the larval myoanatomy and myogenesis of A. cordata and the
hitherto investigated phoronid and ectoproct species, which may account
for an early distinct evolutionary pathway of the general ontogeny
Original language | English |
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Journal | Journal of Morphology |
Issue number | 12 |
Pages (from-to) | 1478 |
Number of pages | 1 |
ISSN | 0362-2525 |
Publication status | Published - 2008 |
Event | 1st International Congress on Invertebrate Morphology - Copenhagen, Denmark Duration: 17 Aug 2008 → 21 Aug 2008 |
Conference
Conference | 1st International Congress on Invertebrate Morphology |
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Country | Denmark |
City | Copenhagen |
Period | 17/08/2008 → 21/08/2008 |
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