Spermatogenesis in the deep‐sea brachiopod <i>Pelagodiscus atlanticus</i> and the phylogenetic significance of spermatozoon structure

Temereva, E. N.; Kuzmina, T. V.

doi:10.1002/jmor.20887

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…Morphology of the lophophore and tentacles in brachiopods. In extant and extinct brachiopods, there are at least nine different types of lophophores 10 . Two types, the taxolophe and the trocholophe, may be distinguished in the postembryonic development of all species studied to date 22 .…”

Section: Discussionmentioning

confidence: 99%

First data on the organization of the nervous system in juveniles of Novocrania anomala (Brachiopoda, Craniiformea)

Temereva

2020

Sci Rep

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first data on the organization of the nervous system in juveniles of Novocrania anomala (Brachiopoda, craniiformea) elena n. temereva 1,2 the organization and development of the nervous system are traditionally used for phylogenetic analysis and may be useful for clarification of evolution and phylogeny of some poor studied groups. one of these groups is brachiopods: most data on their nervous system organization were obtained in 19 th century. in this research, antibody staining and confocal laser scanning microscopy were used to study the nervous system of early ontogenetic stages of the brachiopod Novocrania anomala. Although N. anomala adults are thought to lack a supraenteric ganglion, a large supraenteric ganglion exists in N. anomala juveniles with either a trocholophe or a schizolophe. During ontogenesis, the supraenteric ganglion in the juvenile changes its shape: the commissure between the two lobes of the ganglion extends. this commissure possibly gives rise to the main brachial nerve in adults. the supraenteric ganglion gives rise to the cross (transversal) nerves that extend to the accessory brachial nerve, which gives rise to the tentacular nerves. in juveniles with a trocholophe, the accessory brachial nerve gives rise to the frontal and intertentacular nerves of tentacles that form a single row. When the trocholophe transforms into the schizolophe, the second row of tentacles appears and the innervation of the tentacles changes. the intertentacular nerves disappear and the second accessory nerve forms and gives rise to the laterofrontal tentacular nerves of the inner and outer tentacles and to the abfrontal nerves of the inner tentacles. the so-called subenteric ganglion, which was described as a ganglion in N. anomala adults, is represented by a large circumvisceral nerve in N. anomala juveniles.the results suggest that 'phoronid-like' non-specialized tentacles may be regarded as the ancestral type of tentacles for brachiopods and probably for all lophophorates. the presence of intertentacular nerves is the ancestral feature of all lophophorates. the transformation of the juvenile supraenteric ganglion into the main brachial nerve of N. anomala adults suggests that research is needed on the development and organization of the supraenteric ganglion and the main brachial nerve in other brachiopods, whose adults have a prominent supraenteric ganglion. Brachiopods are marine benthic animals with sessile life styles. They are filter feeders, i.e., they use a specialized tentacular structure called the lophophore to capture food particles. Today about 400 extant species species are described, however more than 30,000 extinct species are known to science 1-3. An understanding of the biology of the many extinct brachiopods requires research on the development and organization of all organ systems of extant species from different groups. Although the organization of the nervous system is traditionally regarded as important for comparative anatomy and phylogeny, the anatomy of the nervous system of extant ...

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Section: Discussionmentioning

confidence: 99%

First data on the organization of the nervous system in juveniles of Novocrania anomala (Brachiopoda, Craniiformea)

Temereva

2020

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“…All brachiopods have dorsal and ventral shell plates, which are produced by the body wall (mantle) and cover the soft body. According to the most common phylogeny, all recent brachiopods can be subdivided into three subphyla: Linguliformea, Craniiformea, and Rhynchonelliformea [1][2][3]. The first two subphyla are traditionally gathered into "inarticulate" brachiopods, because their shell valves lack articulate structures.…”

Section: Introductionmentioning

confidence: 99%

First Modern Data on the Lophophore Nervous System in Adult Novocrania anomala and a Current Assessment of Brachiopod Phylogeny

Temereva

2022

Biology

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Although the lophophore is regarded as the main synapomorphy of all lophophorates, the evolution of the lophophore in certain groups of lophophorates remains unclear. To date, the innervation of the lophophore has been studied with modern methods only for three brachiopod species belonging to two subphyla: Linguliformea and Rhynchonelliformea. In the third subphylum, the Craniiformea, there are data for juveniles but not for adults. In the current research, the innervation of the lophophore in Novocrania anomala adults was studied by immunocytochemistry and confocal laser scanning microscopy. In the spiral lophophore of adults of the craniiform N. anomala, each arm is innervated by six brachial nerves: main, additional main, accessory, second accessory, additional lower, and lower brachial nerves. Compared with other brachiopod species, this complex innervation of the lophophore correlates with the presence of many lophophoral muscles. The general anatomy of the lophophore nervous system and the peculiarities of the organization of the subenteric ganglion of the craniiform N. anomala have a lot in common with those of rhynchonelliforms but not with those of linguliforms. These findings are consistent with the “Calciata” hypothesis of the brachiopod phylogeny and are inconsistent with the inference that the Craniiformea and Linguliformea are closely related.

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“…We studied the spermatogenesis and ultrastructure of sperm in P. atlanticus (Temereva and Kuzmina 2018). The spermatozoon has a large acrosome, a small compact nucleus, eight mitochondria around the nucleus, two orthogonal centrioles, and a long tail.…”

Section: Resultsmentioning

confidence: 99%

“…Thera are 63 species of deep-sea recent brachiopods that live at a depth of more than 2,000 meters and can be divided into two groups (Zezina 1989(Zezina , 1994 Bitner et al 2013). A large number of mitochondria in the spermatozoon of P. atlanticus may also be considered as an adaptation for deep-water occurrence in this species since spermatozoon needs a lot of energy for external fertilization at extreme depths (Temereva and Kuzmina 2018).…”

Section: Discussionmentioning

confidence: 99%

Biogeographic Atlas of the Deep NW Pacific Fauna

Saeedi¹,

Brandt²

2020

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We would like to thank the captains and crews of RVs 'Akademik M.A. Lavrentyev' and 'Sonne' , student helpers, and anyone else who contributed to sample management and sorting the specimens. Special thanks to Mark Costello for his advice and Marianna Simões for her help in this book project. A very special thanks to James Reimer for editing and English proofreading of this chapter and to Rachel Downey for English proofreading most of the chapters of this book.

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Spermatogenesis in the deep‐sea brachiopod Pelagodiscus atlanticus and the phylogenetic significance of spermatozoon structure

Cited by 6 publications

References 21 publications

First data on the organization of the nervous system in juveniles of Novocrania anomala (Brachiopoda, Craniiformea)

First data on the organization of the nervous system in juveniles of Novocrania anomala (Brachiopoda, Craniiformea)

First Modern Data on the Lophophore Nervous System in Adult Novocrania anomala and a Current Assessment of Brachiopod Phylogeny

Biogeographic Atlas of the Deep NW Pacific Fauna

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