External ultrastructure of Manayunkia speciosa (Fabriciidae) from Uruguay River, Argentina

Autores/as

  • Analía Cristina Paola
  • Laura Cecilia Armendáriz
  • Alberto Rodrigues Capítulo

DOI:

https://doi.org/10.7550/rmb.31908

Palabras clave:

Manayunkia speciosa, Polychaeta, ultramorphology, external characters, scanning-electron microscopy

Resumen

The external ultrastructure of Manayunkia speciosa Leidy, 1858 from specimens collected at the lowerUruguay River, South America is described using scanning-electron-microscopy. The branchial crown has a pairof semicircular lateral lobes, a pair of mediodorsal radioles and a pair of medioventral ones. Radiolar surfaces areciliated. The faecal groove is observed on peristomium middorsally. The anterior margin of the anterior peristomialring formed a rectangular lobe, with a ciliated band. Chaetal shape exemplifies the basic type of tapering cylinder.Two types of thoracic notochaetae: one wider distally, with a smooth handle, and covered on the surface by denticles,and other are significantly finer at the base and covered by thin structures with a free distal end. These structures werenot previously recorded in Fabriciidae. Rows of 3 aligned uncini anteriorly projected are found in the thorax. Eachuncinus presents a long manubrium which connects with the crest, extending to a main fang. The teeth of the crestare equal in size. The abdomen present 4 types of neurochaetae: one of small size than the other 3. In the abdomen 10-14 uncini form dense dorsal-transverse-lines. Each uncinus presents a short manubrium. The crest is covered withteeth of similar size.

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Publicado

2013-06-25

Número

Sección

ANATOMÍA