The morphology of Laubieriopsis sp. (Polychaeta, Fauveliopsidae) and the position of fauveliopsids in the polychaete system

Zhadan, Anna; Atroshchenko, Margarita

doi:10.1134/s1062359010090025

Cited by 6 publications

(12 citation statements)

References 11 publications

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“…In members of Lauberiopsis sp., they have been termed brain and brain lobe (fig. 3a in Zhadan & Atroshchenko 2010); in specimens of Lauberiopsis arenicola R iser 1987, this feature was not described in detail, but on the figures provided, a pair of posterior lobes is clearly recognizable (figs. 7, 8 in Riser 1987).…”

Section: Discussionmentioning

confidence: 99%

“…Although the exact phylogenetic relationships of Fauveliopsidae are still being debated, it appears more or less settled that Fauveliopsidae are either sister to Flabelligeridae or are at least somehow closely related to them based on both morphological and molecular evidence (Rouse & Pleijel 2001, 2003; Salazar‐Vallejo et al 2008; Struck et al 2008; but see Zhadan & Atroshchenko 2010). Fauveliopsis was included in Flabelligeridae until Hartman (1971) erected the separate taxon Fauveliopsidae, now comprising Fauveliopsis and Laubieriopsis .…”

Section: Discussionmentioning

confidence: 99%

“…(see Thiel et al 2011), and in Lauberiopsis spp. (Riser 1987; Zhadan & Atroshchenko 2010; S. I. Salazar‐Vallejo & A. E. Zhadan, unpubl. obs.…”

Section: Discussionmentioning

confidence: 99%

“…The annelid taxon Fauveliopsidae H artman 1971 currently includes 17 described species mainly occurring in abyssal and bathyal depths; only a few species have been reported from shallow waters (Katzmann & Laubier 1974; Riser 1987; Blake & Petersen 2000; Rouse & Pleijel 2001). The status and systematic position of this group are still uncertain, although it is often regarded as a close relative of Flabelligeridae (Rouse & Fauchald 1997; Rouse & Pleijel 2001, 2003; Salazar‐Vallejo et al 2008; Zhadan & Atroshchenko 2010). Some molecular analyses indicate a close relationship with Sternaspis or Flabelligeridae, and sometimes, Sipuncula are found in the same clade as well (Struck et al 2007, 2008; Rousset et al 2007).…”

mentioning

confidence: 99%

“…Very little is known about the biology and morphology of fauveliopsids (Blake & Petersen 2000). The only more or less detailed studies of internal morphology published to date are those of Riser (1987) and Zhadan & Atroshchenko (2010), which describe members of the genus Laubieriopsis . Only one ultrastructural study of the nuchal organs is available, on members of Fauveliopsis cf.…”

mentioning

confidence: 99%

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Sipunculid-like ocellar tubes in a polychaete, Fauveliopsis cf. adriatica (Annelida, Fauveliopsidae): implications for eye evolution

Purschke

2011

Invertebrate Biology

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A retractable head region somewhat resembling the introvert of sipunculans is a characteristic feature of members of the annelid taxon Fauveliopsidae. The morphology of fauvelopsids is not well known, and additional data might help to resolve their relationships with other annelids and sipunculans. Ultrastructural investigations of the anterior end of adults of Fauveliopsis cf. adriatica revealed peculiar brain and sensory structures. From the neuropil of the brain, two pairs of lobes mainly composed of neuronal somata extend posteriorly into the peristomium and the following segment. The nuchal organs are embedded in the median pair of lobes, as are additional photoreceptor-like sensory structures, the ocellar tubes, which are found at the bases of epidermal follicles that extend deeply into the brain. The retractor muscles of the prostomium are attached to the apices of these follicles, which are lined by tendon and supportive cells. The lumen of each follicle is completely filled with cuticular material that forms a rod. Monociliary sensory cells are present all along the length of each follicle; their cilia extend into the cuticle, and are oriented parallel to the longitudinal axis of the tube. Basally, each follicle forms an ovoid extension that is devoid of cuticular material and densely filled with numerous sensory processes-microvilli and ciliaof bipolar sensory cells. The terminal end of the 40-mm-deep follicle is formed by two conspicuous cells that contain numerous densely packed vesicles that resemble pigment granules. The ocellar tubes of fauveliopsids are strikingly similar to the ocular tubes of sipunculids. These similarities may reflect common ancestry or may represent convergent evolution; both alternatives are partially supported by previous morphological and molecular studies.

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Section: Discussionmentioning

confidence: 99%