Anatomy of the pallial tentacular organs of the scallop Nodipecten nodosus (Linnaeus, 1758) (Bivalvia: Pectinidae)

Audino, Jorge A.; Marian, José Eduardo A. R.; Wanninger, Andreas; Lopes, Sônia Godoy Bueno Carvalho

doi:10.1016/j.jcz.2015.06.004

Cited by 8 publications

(22 citation statements)

References 40 publications

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Section: Discussionmentioning

confidence: 59%

“…Secretory activity in MFT was also shown for N. nodosus (Audino et al, ), including acidic and neutral mucosubstances very similar to those of S. ictericus . In the case of N. nodosus , cilia are densely distributed over the tentacle surface (Audino et al, ). In contrast, S. ictericus exhibits longitudinal rows of cilia along the MFT that are supposed to promote mucus propulsion, which is supported by the presence of secretory droplets in adjacent areas.…”

Section: Discussionmentioning

confidence: 59%

“…In the pteriid and ostreid species studied herein, MFT and IFT innervations are characterized by a branching pattern throughout the tentacle, resulting in numerous small nerves running along the organ and reaching the ciliated cells (possibly sensory receptor cells). This suggests another common pattern shared by Pterioidea and Ostreoidea (Figure ), which is distinct, for example, from tentacle innervation in the pectinid N. nodosus , in which a single central nerve emits very tiny projections to the epithelium (Audino et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Mantle margin samples were obtained after dissecting animals previously anesthetized in a 7.5% solution of MgCl 2 for 3 hr. Representatives of the Limidae and Pectinidae have been previously examined (Audino et al, ; Gilmour, ) and were not included in our study.…”

Section: Methodsmentioning

confidence: 99%

“…Tentacles are slender, flexible appendages in animals, usually comprehending contractible, and soft‐tissue extensions of the body (Brusca, Moore, & Shuster, ). Despite clearly not being homologous between phyla, tentacles have evolved multiple times in numerous taxa, performing different roles deeply associated with the lifestyle and ecology of the organism (Audino, Marian, Wanninger, & Lopes, ; Roberts & Moore, ; Tamberg & Shunatova, ; Zhadan & Tzetlin, ). In this context, three main functions can be assigned to tentacular organs, that is, feeding, protective, and sensory.…”

Section: Introductionmentioning

confidence: 99%

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Form and function of tentacles in pteriomorphian bivalves

Audino

Marian

2019

Journal of Morphology

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Tentacles are remarkable anatomical structures in invertebrates for their diversity of form and function. In bivalves, tentacular organs are commonly associated with protective, secretory, and sensory roles. However, anatomical details are available for only a few species, rendering the diversity and evolution of bivalve tentacles still obscure. In Pteriomorphia, a clade including oysters, scallops, pearl oysters, and relatives, tentacles are abundant and diverse. We investigated tentacle anatomy in the group to understand variation, infer functions, and investigate patterns in tentacle diversity. Six species from four pteriomorphian families (Ostreidae, Pinnidae, Pteriidae, and Spondylidae) were collected and thoroughly investigated with integrative microscopy techniques, including histology, scanning electron microscopy, and confocal microscopy. Tentacles can be classified as middle fold tentacles (MFT) and inner fold tentacles (IFT) according to their position with respect to the folds of the mantle margin. While MFT morphology indicates intense secretion of mucosubstances, no evidence for secretory activity was found for IFT. However, both tentacle types have appropriate ciliary distribution and length to promote mucus transportation for cleaning and lubrication. Protective and sensory functions are discussed based on different lines of evidence, including secretion, cilia distribution, musculature, and innervation. Our results support the homology of MFT and IFT only for Pterioidea and Ostreoidea, considering their morphology, the presence of ciliated receptors at the tips, and branched innervation pattern. This is in accordance with recent phylogenetic hypotheses that support the close relationship between these superfamilies. In contrast, major structural differences indicate that MFT and IFT are probably not homologous across all pteriomorphians. By applying integrative microscopy, we were able to reveal anatomical elements that are essential for the understanding of homology and function when dealing with such superficially similar structures.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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