Phylogenetic relationships within Maldanidae (Capitellida, Annelida), based on morphological characters

Assis, José Eriberto De; Christoffersen, Martin Lindsey

doi:10.1080/14772000.2011.604358

Cited by 9 publications

(9 citation statements)

References 31 publications

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“…12e); 4 neurochaetae in adults are acicular spines with capitium ; 5 notopodial chaetal sac involute (Pilgrim 1977; this paper), 6 posterio-ventral position of formative site in notopodia (Pilgrim 1977; this paper), 7 hooked chaetae in adults are transformed in chaetiger one to four (Arwidsson 1906); 8 neurochaeta are absent in chaetiger 1-4 in adults; 9 from chaetiger 5 onward neurochaetae are a double row of avicular uncini (Fig. 11h-k;Arwidsson 1906;de Assis and Christoffersen 2011); 10 single row of large rostro-median capital teeth (Fig. 11m); 11 chaetal sac straight from chaetiger 13 onward in adults (Figs.…”

Section: Phylogenetic Significance Of Hooked Chaetaementioning

confidence: 88%

“…This monophyletic group has been termed Maldanomorpha and has been confirmed in several phylogenetic analyses based on molecular data as well (Bleidorn et al 2003;Rousset et al 2007;Struck et al 2007). Maldanomorpha are regarded as sister group of Psammodrilidae de Assis and Christoffersen 2011). All three possess hooked chaetae with barbules, albeit these structures may get lost or alter during ontogenesis in different lineages as described above in Maldanidae and by Bartolomaeus and Meyer in Arenicolidae (1997; Fig.…”

Section: Phylogenetic Significance Of Hooked Chaetaementioning

confidence: 93%

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Phylogenetic significance of chaetal arrangement and chaetogenesis in Maldanidae (Annelida)

et al. 2015

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Chaetae are important structures to facilitate locomotion in annelids. Being at the interface between the organisms and its environment, chaetae are supposed to underlie strong functional constraints to optimize the relation between structure and function. As such chaetae are potentially susceptible for convergent evolution. On the other hand, chaetae gained enormous taxonomic importance due to their conservative structure in species and supraspecific taxa which reasonably can only be explained by strong evolutionary constrains that conserve their structure. In this paper, we study the chaetation and chaetogenesis in two species of Maldanidae, Clymenura clypeata Saint-Joseph 1894 and Johnstonia clymenoides Quatrefages 1866 to unravel conservative traits in their structure and development. In a literature survey across maldanids, we address questions on the ontogenetic variation, on homology and on the phylogenetic significance especially of the bearded hooked neurochaetae. We provide evidence that functionally constraint ontogenetic variation overlies historically (phylogenetically) constraint expression of structural information and can show that within maldanids a variety of different chaetal types must be homologous due to their ontogenetic continuity. Furthermore, we use chaetation and chaetal characters to discuss the subgroup relationships within Maldanomorpha in the light of recent cladistics analyses based on morphological and molecular data. This study shows that functional considerations need to use phylogenies as backbone.

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Section: Phylogenetic Significance Of Hooked Chaetaementioning

confidence: 88%

Section: Phylogenetic Significance Of Hooked Chaetaementioning

confidence: 93%

Phylogenetic significance of chaetal arrangement and chaetogenesis in Maldanidae (Annelida)

et al. 2015

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“…The Maldanidae, also known as bamboo worms, is a tubicolous and common family found in hard or soft substrates from the intertidal region to the deep sea (Paterson et al 2009; De Assis and Christoffersen 2011). Maldanid species have a long, cylindrical body, generally with one or both truncate ends; elongated median segments with prominent tori on the end of each chaetiger; a keel-shaped prostomium fused to the peristomium; and a pair of nuchal grooves located on each side of the prostomium (Fauchald 1977; Fauchald and Rouse 1997; De Assis and Christoffersen 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Maldanid species have a long, cylindrical body, generally with one or both truncate ends; elongated median segments with prominent tori on the end of each chaetiger; a keel-shaped prostomium fused to the peristomium; and a pair of nuchal grooves located on each side of the prostomium (Fauchald 1977; Fauchald and Rouse 1997; De Assis and Christoffersen 2011). …”

Section: Introductionmentioning

confidence: 99%

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A new Maldane species and a new Maldaninae genus and species (Maldanidae, Annelida) from coastal waters of China

Wang¹,

Li²

2016

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Paramaldane, new genus, with type species Paramaldane glandicincta sp. n., and Maldane adunca sp. n. (Maldanidae, Polychaeta) are described based on material from the coast of south China. The new genus Paramaldane is similar to Maldane Grube, 1860 and Sabaco Kinberg, 1867, but it clearly differs from all genera within the subfamily Maldaninae by a unique combination of characters: the cephalic plate is almost circular with low, entire and smooth cephalic rim, nuchal grooves small and crescentic, lacking a collar on chaetiger 1, short companion notochaetae, a collar-like glandular band on the anterior part of the sixth chaetiger, and a well-developed anal valve. Paramaldane glandicincta sp. n. is characterised by having a glandular band on the anterior part of the sixth chaetiger, an almost circular cephalic plate, an entire and smooth cephalic rim, and small crescentic nuchal grooves. Maldane adunca sp. n. is characterised by a low cephalic rim, nuchal grooves with a strongly curved anterior part and isolated from the cephalic rim. Finally, a taxonomic key to genera of Maldaninae and a comparative table to species of Maldane are provided.

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Formation and degeneration of scaled capillary notochaetae in Owenia fusiformis Delle Chiaje, 1844 (Oweniidae, Annelida)

2021

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Phylotranscriptomic studies of the past decade have repeatedly placed Oweniidae together with Magelonidae, as the sister group to remaining annelids. This newly established placement clearly makes them a key-lineage for understanding annelid evolution and morphology. One of the most prominent morphological features of all annelids are their chaetae. The arrangement and formation process (chaetogenesis) of these chitinous bristles have been studied extensively in hooked chaetae that are arranged in rows. However, the information on other types of chaetae is still scarce. In this study, we investigated the scaled capillary notochaetae of Owenia fusiformis, looking both into the formation process that causes the scaly surface ornamentation and into their arrangement within tight bundles. Our results demonstrate the incredible plasticity of chaetogenesis that allows forming a vast array of three-dimensional structures. The capillary chaetae of Owenia fusiformis are unique in lacking an enamel coating and the scales covering the apical surface of each chaeta are formed by a single microvillus of the chaetoblast. Furthermore, the bundle of chaetae has a peripherally located formative site and a central degenerative site and it appears to result from a secondary curling of the chaetal sac.

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Phylogenetic relationships within Maldanidae (Capitellida, Annelida), based on morphological characters

Cited by 9 publications

References 31 publications

Phylogenetic significance of chaetal arrangement and chaetogenesis in Maldanidae (Annelida)

Phylogenetic significance of chaetal arrangement and chaetogenesis in Maldanidae (Annelida)

A new Maldane species and a new Maldaninae genus and species (Maldanidae, Annelida) from coastal waters of China

Formation and degeneration of scaled capillary notochaetae in Owenia fusiformis Delle Chiaje, 1844 (Oweniidae, Annelida)

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