Ophionereis reticulata (Echinodermata, Ophiuroidea)

Yokoyama, Leonardo Q.; Amaral, A. Cecília Z.

doi:10.1590/s0073-47212010000200006

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…O. commutabilis shows similar percentages to A. stygobita (35% and 14%) (Carpenter 2016), another cave species. On the other hand, the regeneration frequency of O. reticulata is similar to that observed in other populations of this species and other epigean species (Lawrence and Vasquez 1996;Yokoyama and Amaral 2010). Therefore, the low incidence of damage in O. commutabilis indicates that sub-lethal predation is low inside El Aerolito as expected.…”

Section: Discussionsupporting

confidence: 86%

“…Regeneration is a common process on brittle stars, caused by damage of arms through sub-lethal predation. As a result, regeneration rate of arms is often used as an estimate of predation pressure (Sköld and Rosenberg 1996;Dupont and Thorndyke 2006;Yokoyama and Amaral 2010), which in caves decreases in importance or is absent (Gibert and Deharveng 2002). The regeneration frequencies of each specimen were registered by counting the regenerating scars on the oral side.…”

Section: Regeneration Frequencymentioning

confidence: 99%

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Troglomorphism in the brittle star Ophionereis commutabilis Bribiesca-Contreras et al., 2019 (Echinodermata, Ophiuroidea, Ophionereididae)

Márquez-Borrás¹,

Solís-Marín²,

Mejía-Ortíz³

2020

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Due to their peculiar and sometimes bizarre morphology, cave fauna (across invertebrates and vertebrates from both aquatic and terrestrial cave habitats) have fascinated researchers throughout history. Despite their success in colonizing most marine ecosystems, the adaptations of cave brittle stars (Ophiuroidea) to a stygobiotic lifestyle have been scarcely examined. Employing comparative methods on a data set of two species belonging to the genus Ophionereis, this study addresses whether a cave-dwelling species from Cozumel exhibited similar troglomorphic traits as those of other taxa inhabiting caves. Our work demonstrated that some characters representing potential morphological cave adaptations in O. commutabilis were: bigger sizes, elongation of arms and tube feet and the presence of traits potentially paedomorphic. In addition, an element of ophiuroid’s photoreceptor system, as well as pigmentation, was observed to be peculiar in this stygobiotic species, plausibly as a result of inhabiting a low light-energy environment. Finally, we add evidence to the statement that O. commutabilis is a cave endemic species, already supported by demography, distribution and origin of this species, and now by a typical array of troglomorphisms.

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Section: Discussionsupporting

confidence: 86%

Section: Regeneration Frequencymentioning

confidence: 99%

Troglomorphism in the brittle star Ophionereis commutabilis Bribiesca-Contreras et al., 2019 (Echinodermata, Ophiuroidea, Ophionereididae)

Márquez-Borrás¹,

Solís-Marín²,

Mejía-Ortíz³

2020

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Regeneration in Stellate Echinoderms: Crinoidea, Asteroidea and Ophiuroidea

Khadra

Sugni

Ferrario

et al. 2018

Results and Problems in Cell Differentiation

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Reparative regeneration is defined as the replacement of lost adult body parts and is a phenomenon widespread yet highly variable among animals. This raises the question of which key cellular and molecular mechanisms have to be implemented in order to efficiently and correctly replace entire body parts in any animal. To address this question, different studies using an integrated cellular and functional genomic approach to study regeneration in stellate echinoderms (crinoids, asteroids and ophiuroids) had been carried out over the last few years. The phylum Echinodermata is recognized for the striking regeneration potential shown by the members of its different clades. Indeed, stellate echinoderms are considered among the most useful and tractable experimental models for carrying comprehensive studies focused on ecological, developmental and evolutionary aspects. Moreover, most of them are tractable in the laboratory and, thus, should allow us to understand the underlying mechanisms, cellular and molecular, which are involved. Here, a comprehensive analysis of the cellular/histological components of the regenerative process in crinoids, asteroids and ophiuroids is described and compared. However, though this knowledge provided us with some clear insights into the global distribution of cell types at different times, it did not explain us how the recruited cells are specified (and from which precursors) over time and where are they located in the animal. The precise answer to these queries needs the incorporation of molecular approaches, both descriptive and functional. Yet, the molecular studies in stellate echinoderms are still limited to characterization of some gene families and protein factors involved in arm regeneration but, at present, have not shed light on most of the basic mechanisms. In this context, further studies are needed specifically to understand the role of regulatory factors and their spatio-temporal deployment in the growing arms. A focus on developing functional tools over the next few years should be of fundamental importance.

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