A New Species of<i>Cyamiocardium</i>Soot-Ryen, 1951 from Shallow Waters off Brazil, with a Discussion on the Anatomical Characters of the Cyamiidae (Bivalvia: Cyamioidea)

Passos, Flávio Dias; Machado, Fabrizio Marcondes

doi:10.4003/006.032.0110

Cited by 19 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Carnivorous bivalves from the order Anomalodesmata also bear siphonal tentacles (e.g., Cardiomya cleryana ; Machado, Morton, & Passos, ). More rarely, tentacles may also occur in the anterior portion of the pedal opening, as observed in Cyammiidae (Passos & Machado, ).…”

Section: Discussionmentioning

confidence: 93%

Form and function of tentacles in pteriomorphian bivalves

Audino

Marian

2019

Journal of Morphology

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 93%

Form and function of tentacles in pteriomorphian bivalves

Audino

Marian

2019

Journal of Morphology

View full text Add to dashboard Cite

show abstract

“…Since formally proposed by Soot-Ryen (1951), and for more than 50 years, the genus Cyamiocardium remained represented by only three species: C. denticulatum (with C. rotundatum as a synonym), C. dahli, and C. crassilabrum. More recently, Passos and Machado (2014) described an additional species (C. domaneschii), and Zelaya (2008) removed C. crassilabrum from this genus, alternatively placing it into Perrierina. As part of the present study, the concept of C. denticulatum (the type species) was clarified, resulting in the revalidation of C. rotundatum as a full species.…”

Section: Discussionmentioning

confidence: 99%

“…The genus Cyamiocardium was proposed by Soot-Ryen (1951) to relocate Cyamium denticulatum Smith 1907, a species described from the Ross Sea, Antarctica. Subsequently, four other species were included under this genus: Cyamium rotundatum Thiele 1912, from Gauss station, Antarctica; Cyamiocardium dahli Soot-Ryen 1957, from southern Chile; Cyamiocardium crassilabrum Dell 1964, from Malvinas/Falkland Islands; and Cyamiocardium domaneschii Passos and Machado 2014, from southern Brazil. The former was subsequently regarded by Soot-Ryen (1951) as a possible synonym of C. denticulatum, a synonymy ratified by Engl (2012).…”

Section: Introductionmentioning

confidence: 99%

The genus Cyamiocardium Soot-Ryen, 1951 (Bivalvia: Cyamiidae) in sub-Antarctic and Antarctic waters

Urcola

Zelaya

2018

Polar Biol

View full text Add to dashboard Cite

For more than 50 years the genus Cyamiocardium was regarded as represented by three species: Cyamiocardium denticulatum (with Cyamiocardium rotundatum as a synonym), Cyamiocardium dahli, and Cyamiocardium crassilabrum. However, in the last years, the latter was removed from Cyamiocardium, alternatively being placed into Perrierina. All these species were mainly based on the general shell morphology of a reduced number of specimens, with scarce (or no) information on their anatomy and reproductive traits. The present study provides the first systematic revision of the species of Cyamiocardium occurring in sub-Antarctic and Antarctic waters. For that, an extant source of material was available; and several characters not studied (in detail) before, such as prodissoconch morphology and microsculpture, gross anatomy, and reproductive characteristics, were investigated. As part of this study, the identity of C. denticulatum (the type species of the genus) and that of C. dahli are clarified. In addition, C. rotundatum is revalidated as a full species, and C. crassilabrum is transferred again to Cyamiocardium. Furthermore, three new species were detected and are described herein: Cyamiocardium chuanisinense new species, Cyamiocardium 1✉ 1,2 1 2 9/2/2018 e.Proofing http://eproofing.springer.com/journals_v2/printpage.php?token=H38LNURx0ADDH46a93G63IkGbXj5Cs1_03aqTFwKW71wKgeN4t7VHQ 2/36 namuncurense new species, and Cyamiocardium yeskumaala new species. The new information arising from this study is used to redefine the genus Cyamiocardium, and to re-analyze the similarities/differences of this genus with other cyamiids.

show abstract

“…This layer remains in place throughout the entire incubation period and appears to form a barrier to the entry and ingestion of exogenous food particles. In other species of brooding microbivalves (Cyamioidea), the embryos are enclosed by a membrane which is attached to abfrontal region of the branchial filaments by means of a stalk peduncle [33,39]. In the cyamiid Cyamiocardium domaneschii [39], the oocyte is covered by a thin cap of follicular tissue which persists throughout vitellogenesis, fertilisation and juvenile development, after which the membrane and peduncle disappear, leaving the juveniles moving freely within the suprabranchial cavity [39].…”

Section: Cohortmentioning

confidence: 99%

“…Ostrea chilensis, [10]. In other species, however, the embryos remain immobile during brooding, in which case they are maintained on the surface of the gill, either individually anchored to the gill filaments by the embryonic byssus or attached to the gill by means of mucous masses or specialised structures which prevent premature release of the embryos from the brooding chamber [3,16,17,19,28,32,35,36,39]. In some bivalve species gill structure becomes extensively modified during the incubation period in such a way that the water tubes in the inner demibranchs are temporarily transformed into marsupia in which the embryos are retained (e.g.…”

Section: Introductionmentioning

confidence: 99%

Embryo brooding and its effect on feeding in the bivalve Gaimardia bahamondei Osorio & Arnaud, 1984

et al. 2016

View full text Add to dashboard Cite

Gaimardia bahamondei is a small gonochoric bivalve which lives attached to subtidal algae. Females brood their embryos in the suprabranchial region of the pallial cavity, in close proximity to the gill filaments. We found no significant difference in clearance rate between males (non-brooders) and females (brooders), regardless of the numbers of embryos in the brood, suggesting that the presence of embryos does not interfere with particle capture by the brooding female. Embryos did not ingest microalgae, indicating that they do not compete with the female for food during incubation. These observations contrast with published data on other brooding bivalves in which particle retention by the adult is reduced during brooding, and the embryos may capture particles suspended in the pallial cavity. These differences among bivalve taxa in the effects of brooding on physiological processes in the female are attributable to distinct morphological adaptations of the gill for brooding.

show abstract

A New Species ofCyamiocardiumSoot-Ryen, 1951 from Shallow Waters off Brazil, with a Discussion on the Anatomical Characters of the Cyamiidae (Bivalvia: Cyamioidea)

Cited by 19 publications

References 11 publications

Form and function of tentacles in pteriomorphian bivalves

Form and function of tentacles in pteriomorphian bivalves

The genus Cyamiocardium Soot-Ryen, 1951 (Bivalvia: Cyamiidae) in sub-Antarctic and Antarctic waters

Embryo brooding and its effect on feeding in the bivalve Gaimardia bahamondei Osorio & Arnaud, 1984

Contact Info

Product

Resources

About