Anatomy of the coelomic system in Novocrania anomala (Brachiopoda, Craniiformea) and relationships within brachiopods

Plandin, F.A.; Temereva, E. N.

doi:10.1016/j.zool.2020.125884

Cited by 2 publications

(4 citation statements)

References 38 publications

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“…The outer morphology of living craniids was described in several reliable studies before (Atkins & Rudwick, 1962; Blochmann, 1892; Hyman, 1959; Joubin, 1886; Rudwick, 1970; Williams, James, et al, 1997). In the present study, we demonstrated the presence of an anal chamber, which has been previously described as a separate coelomic compartment in all studies (where mentioned) except in Plandin and Temereva (2021). In the latter paper, the anal chamber is mistakenly regarded as projection of the perivisceral cavity.…”

Section: Discussionsupporting

confidence: 82%

“…As Robinson (2014) supposes, the extension of the brachia might be carried out via the hydrostatic system. This function would best be performed by the large brachial canals, comprising wide and long coelomic spaces on the ventral side of the brachia (Plandin & Temereva, 2021). The supportive role in the protraction of the brachia is played by the elasticity of the dense and expansive connective tissue of the brachia.…”

Section: Discussionmentioning

confidence: 99%

“…It should be emphasized that the valve opening event is associated only with the perivisceral coelom. The periesophageal coelom (anterior coelomic chamber, Robinson, 2014) does not participate in this action, being completely separated from the perivisceral coelom, where the lateral oblique muscles are situated (Plandin & Temereva, 2021). Even if the perioesophageal coelom somehow stretches in dorsoventral direction (this is possible, e.g., as a result of brachial muscle contraction, as these muscles are located in the small brachial canals connected via the periesophageal coelom), it is unlikely that this stretching could somehow affect the dorsal valve, due to its separation from the major part of the periesophageal coelom by the alimentary tract and mantle recess, while the perivisceral coelom contacts the dorsal body wall (and, hence, the dorsal valve) in several places (Chuang, 1974).…”

Section: Discussionmentioning

confidence: 99%

“…The muscle names are used according to Williams, James, et al (1997), Williams, Brunton, et al (1997), andRobinson (2014). The names of the coelomic chambers are used as in Blochmann (1892), Hyman (1959), and Plandin and Temereva (2021). The muscle-containing outgrowths of the perivisceral coelom are named after corresponding muscles.…”

Section: Measurements and Terminologymentioning

confidence: 99%

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Revision of the muscular system in the brachiopod Novocrania anomala using 3D reconstruction: Functional and paleontological significance

Plandin,

Temereva

2024

Journal of Morphology

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The musculature is one of the best studied organ systems in brachiopods, being approachable not only by dissecting recent species of brachiopods, but also by exploring muscle scars in fossil material. In the present study, the muscular anatomy of Novocrania anomala is studied using 3D reconstructions based on microcomputed tomography. Muscles of N. anomala may be subdivided into two groups: those related to movements of the lophophore, and those connected to movements of shell valves. Muscles, their morphology and possible functions, such as brachial protractors, elevators, and retractors, as well as anterior adductors, are described and discussed. We also provide the discussion of craniid muscle terminology, consider the valve‐opening mechanism. The investigation of muscle scars on dorsal valves supports the conclusion that the shape of muscle scars should be used for description and distinction of recent and extinct species only when visible distinctness cannot be explained by substrate differences. This study, which is aimed at improving our understanding the anatomy and functioning of muscles in craniids, will be useful not only for zoologists, but also for paleontologists.

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