Structure of the choanocyte kinetid in the sponge Haliclona sp. (Demospongiae: Haplosclerida) and its implication for taxonomy and phylogeny of Demospongiae

Pozdnyakov, Igor R.; Karpov, Sergey A.

doi:10.1134/s1062359016070153

Cited by 7 publications

(17 citation statements)

References 21 publications

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“…But already in the first detailed description of a choanocyte kinetid we found that it is fundamentally different from that of choanoflagellates (Karpov and Efremova, 1994). Moreover, our further special kinetid studies (Pozdnyakov and Karpov, 2013, 2015Pozdnakov et al, 2017aPozdnakov et al, , 2017b have shown several types of kinetid structure in choanocytes that characterize major phylogenetic branches, Calcarea, Homoscleromorpha and Demospongiae, of the tree of Porifera (Figs 1-7, Table 1). Thus, we have to consider which kinetid characters are common for sponge choanocytes as a whole, and to propose the most appropriate description of conservative kinetid features for Porifera.…”

Section: Why We Need the Detailed Study Of Kinetids?mentioning

confidence: 79%

“…(Haplosclerida) (Karpov and Efremova, 1994;Pozdnyakov and Karpov, 2015). The same kinetid type is visible in the illustrations of Haliclona indistincta (Stephens et al, 2013) and H. cinerea (Amano and Hori, 1996) choanocytes (Pozdnyakov et al, 2017a).…”

Section: Class Demospongiaementioning

confidence: 80%

“…In the choanocytes of calcarean sponges two types of kinetid corresponding to two subclasses the Calcaronea and Calcinea have been described (Pozdnyakov and Karpov, 2013;Pozdnyakov et al, 2017aPozdnyakov et al, , 2017bSokolova et al, 2017). Calcaroneans are represented by sponges of the genus Sycon in our research and a kinetid structure of one of its species was studied (Pozdnyakov and Karpov, 2013).…”

Section: Class Calcareamentioning

confidence: 99%

“…Calcaroneans are represented by sponges of the genus Sycon in our research and a kinetid structure of one of its species was studied (Pozdnyakov and Karpov, 2013). The kinetosome connects to an apically located nucleus by the fibrillar root.…”

Section: Class Calcareamentioning

confidence: 99%

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Kinetid structure of choanoflagellates and choanocytes of sponges does not support their close relationship

Pozdnyakov¹,

Agniya

Alexander

et al. 2017

Protistology

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SummaryAny discussion of the origin of Metazoa during the last 150 years and particularly in the recent years when the sister relationship of choanoflagellates and Metazoa was unambiguously shown by molecular phylogeny refers to the similarity of sponge choanocytes to choanoflagellates. These two types of collared radially symmetric cells are superficially similar with respect to the presence of microvilli around a single flagellum and flat mitochondrial cristae which are common for many eukaryotes. But a comparison of the most informative structure having a stable phylogenetic signal, the flagellar apparatus or kinetid, has been neglected. The kinetid is well studied in choanoflagellates and is rather uniform, but in choanocytes this structure has been investigated in the last five years and is represented by several types of kinetids. Here we review the kinetid structure in choanocytes of Porifera to establish the most conservative type of kinetid in this phylum. The detailed comparison of this kinetid with the flagellar apparatus of choanoflagellates demonstrates their fundamental difference in many respects. The choanocyte kinetid contains more features which can be considered plesiomorphic for the opisthokonts than the kinetid of the choanoflagellates. Therefore, the hypothesis about the origin of Porifera, and consequently of all Metazoa directly from choanoflagellate-like unicellular organism is not confirmed by their kinetid structure.

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Section: Why We Need the Detailed Study Of Kinetids?mentioning

confidence: 79%

Section: Class Demospongiaementioning

confidence: 80%

Section: Class Calcareamentioning

confidence: 99%

Section: Class Calcareamentioning

confidence: 99%

See 2 more Smart Citations

Kinetid structure of choanoflagellates and choanocytes of sponges does not support their close relationship

Pozdnyakov¹,

Agniya

Alexander

et al. 2017

Protistology

Self Cite

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show abstract

“…The few available studies of choanocytes of Porifera show that the characters of their kinetids are rather specific for this group with respect to the flagellar transition zone and flagellar root organization (Boury‐Esnault et al, ; Karpov and Efremova, ; Amano and Hori, ; Gonobobleva and Maldonado, ; Maldonado, ; Pozdnyakov and Karpov, ). Choanocyte kinetids normally comprise a flagellar kinetosome and, in some investigated species, an orthogonal non‐flagellar kinetosome or centriole.…”

Section: Introductionmentioning

confidence: 99%

Kinetid structure in Choanocytes of Sponges (Heteroscleromorpha): Toward the ancestral Kinetid of Demospongiae

Pozdnyakov

Karpov

2016

Journal of Morphology

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Every large clade of Eukarya has its own pattern of kinetid (flagellar apparatus) structure, which is stable and specific within the group, thereby being a good phylogenetic marker. The kinetid structure of sponge choanocytes might be a candidate for such marker for the phylogeny of Porifera. Kinetids of two heteroscleromorphs, Halichondria sp. (Suberitida) and Crellomima imparidens (Poecilosclerida), have been investigated here for the first time, and a reconstruction of the kinetid for each species is provided. The kinetids of both species comprise a flagellar kinetosome with a nuclear fibrillar root, a basal foot and satellite producing microtubules; a centriole is absent. Good resolution images reveal a new thin structure, the axial granule, in the flagellar transition zone which might be present in other sponges. The comparison of kinetids in investigated sponges revealed three types of kinetid in Demospongiae, and their distribution in the taxon has been shown on a molecular phylogenetic tree. Kinetid characters of the common ancestor of Demospongiae are discussed. J. Morphol. 277:925-934, 2016. © 2016 Wiley Periodicals, Inc.

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Two new species of Haliclona (Demospongiae: Haplosclerida: Chalinidae) from north-eastern Brazilian coastal waters and oceanic islands

Bispo

Hajdu

2023

J. Mar. Biol. Ass.

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Two new species of Haliclona (Chalinidae, Haplosclerida) are described here from Brazilian oceanic islands and the coast of Ceará State. They derive from collections undertaken between 1999 and 2014, and materials are deposited in the Porifera collection of Museu Nacional in Rio de Janeiro (MNRJ). Haliclona (Halichoclona) insularis sp. nov. can be distinguished from other Haliclona spp. in the western Atlantic by the combination of surface with light to deep red colour intermixed with white to beige areas (occasionally completely beige), white to beige choanosome, small fistular outgrowths, fragile consistency and blunt oxeas (90–175 × 1–5 μm) with irregular tips. Haliclona (Soestella) moraesi sp. nov. is the only western Atlantic species of Haliclona with the combination of thickly encrusting to cushion-shaped habit, purple or light pink colour, and a dense (sub)isotropic skeleton with rounded meshes, and without microscleres. Several attempts to amplify COI mtDNA and 28S C2–D2 rRNA for both species were unsuccessful, in spite of the initial successful extraction of genomic DNA. The number of Haliclona spp. known from the Brazilian coast is now 17. The long gap between species collection and formal description supports the concept of the taxonomic impediment, which is particularly marked in speciose taxa with little morphological disparity, as observed in Haplosclerida.

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Structure of the choanocyte kinetid in the sponge Haliclona sp. (Demospongiae: Haplosclerida) and its implication for taxonomy and phylogeny of Demospongiae

Cited by 7 publications

References 21 publications

Kinetid structure of choanoflagellates and choanocytes of sponges does not support their close relationship

Kinetid structure of choanoflagellates and choanocytes of sponges does not support their close relationship

Kinetid structure in Choanocytes of Sponges (Heteroscleromorpha): Toward the ancestral Kinetid of Demospongiae

Two new species of Haliclona (Demospongiae: Haplosclerida: Chalinidae) from north-eastern Brazilian coastal waters and oceanic islands

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