Evo-Devo in Ophiuroids: The Switch from Planktotrophy to Lecithotrophy in <i>Ophionereis</i>

Selvakumaraswamy, Paulina; Byrne, Maria

doi:10.1086/727755

Cited by 2 publications

(5 citation statements)

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“…Ophionereis fasciata, some larvae develop two long posterodorsals before metamorphosis and others do not (Selvakumaraswamy & Byrne, 2023). The weight of evidence from across ophiuroid genera with ophioplutei points to phenotypic plasticity or developmental heterochronies in arm development (Selvakumaraswamy & Byrne, 2023).…”

Section: Discussionmentioning

confidence: 99%

“…With respect to the question as to whether Type I or II is the ancestral developmental pattern for the class Ophiuroidea (McEdward & Miner, 2001;Mladenov, 1985;Selvakumaraswamy & Byrne, 2023), more data on metamorphic phenotypes across ophiuroid families in context with species' evolutionary relationships are needed. In the only other ophiuroid group for which such inferences can be based on a phylogenetic hypothesis, in Macrophiothrix, the evolution of lecithotrophy involved reduction of the ophiopluteus to a two-armed form (Allen & Podolsky, 2007;Hart & Podolsky, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Intriguingly, several studies show that the Type I versus Type II dichotomy is not so clear, with some larvae exhibiting morphological features intermediate between Types I and II development (Selvakumaraswamy & Byrne, 2006. Diverse metamorphic phenotypes indicate that Types I and II may not be divergent lines of ophiuroid evo-devo and point to selective pressure on the pelagicbenthic transition (Selvakumaraswamy & Byrne, 2023). Plasticity in the patterns of arm resorption and ability for ciliary band rearrangement may be an ancestral trait of ophiuroid development (Cisternas et al, 2004;Selvakumaraswamy & Byrne, 2006.…”

Section: Discussionmentioning

confidence: 99%

“…In other genera (e.g., Ophiocomella), the ophiopluteus transforms into an armless vitellaria larva during metamorphosis through resorption of the larval arms and rearrangement of the feeding ciliary band to form transverse ciliary bands (Type II development, two larval forms) (Mladenov, 1985). There are also species that have larvae that are intermediate between the Types I and II developmental patterns, in which the ophiopluteus can have a fleeting resemblance to a vitellaria during metamorphosis but do not form a free swimming vitellaria (Cisternas et al, 2004;Selvakumaraswamy & Byrne, 2023). Whether Type I or II development is the ancestral state for the Ophiuroidea has been a matter of debate (McEdward & Miner, 2001;Mladenov, 1985;Selvakumaraswamy & Byrne, 2023; Figure S1).…”

Section: Introductionmentioning

confidence: 99%

“…There are also species that have larvae that are intermediate between the Types I and II developmental patterns, in which the ophiopluteus can have a fleeting resemblance to a vitellaria during metamorphosis but do not form a free swimming vitellaria (Cisternas et al, 2004;Selvakumaraswamy & Byrne, 2023). Whether Type I or II development is the ancestral state for the Ophiuroidea has been a matter of debate (McEdward & Miner, 2001;Mladenov, 1985;Selvakumaraswamy & Byrne, 2023; Figure S1). McEdward and Miner (2001) suggest that the ancestral pattern involved an ophiopluteus larva that transforms into a vitellaria larva just before metamorphosis.…”

Section: Introductionmentioning

confidence: 99%

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Evo‐devo in the ophiuroid family Ophiocomidae

Byrne,

Cisternas,

O'Hara

et al. 2024

Invertebrate Biology

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The Ophiuroidea, the most diverse echinoderm class, exhibits an array of life history patterns and larval forms, the evolution of which is poorly understood. With a robust phylogeny available for the major family, the Ophiocomidae, we undertook an assessment of the evolution of development in these ophiuroids. We spawned 15 species and documented larval development in 14 of these. In total, data on egg size or larval development were available for 27 species across the four recognized genera (Breviturma, Ophiocoma, Ophiocomella, and Ophiomastix). Ophiocomids have a bimodal egg size distribution. Species with small eggs (x̄ = 82 μm diameter, range 55–100 μm diameter) and large eggs (x̄ = 424 μm diameter, range 335–550 μm diameter) have planktotrophic ophioplutei and lecithotrophic vitellariae, respectively. The advanced ophiopluteus transforms into an armless vitellaria prior to metamorphosis through resorption of the larval arms and rearrangement of the ciliary tracts into series of transverse bands. Thus, the Type II pattern of development (which includes both the ophiopluteus and vitellaria) may be characteristic of the Ophiocomidae. This is not seen in other ophiuroid families. Evolution of nonfeeding (lecithotrophic) development through a vitellaria larva appears to have occurred only once in this family, in the genus Ophiomastix. Several traits appear to be specific to some species or genera, including an ornate fertilization envelope (Ophiocoma species), the presence of an early barrel‐shaped larva (Breviturma species), and the presence of vibratile lobes in advanced ophioplutei (Breviturma, Ophiocomella). In species with lecithotrophic development, the vitellaria is distinct, with prominent ciliated lobes around the developing juvenile rudiment. Larval form may assist with identification of ophiocomid larvae in plankton samples.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evo‐devo in the ophiuroid family Ophiocomidae

Byrne,

Cisternas,

O'Hara

et al. 2024

Invertebrate Biology

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Evolution of Maternal Provisioning and Development in the Ophiuroidea: Egg Size, Larval Form, and Parental Care

Byrne,

Cisternas,

O'Hara

et al. 2024

Integrative and Comparative Biology

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The Ophiuroidea is the most speciose class of echinoderms and has the greatest diversity of larval forms, but we know less about the evolution of development (evo-devo) in this group than for the other echinoderm classes. As is typical of echinoderms, evo-devo in the Ophiuroidea resulted in the switch from production of small eggs and feeding (planktotrophic) larvae to large eggs and non-feeding (lecithotrophic) larvae. Parental care (ovoviviparity or viviparity/matrotrophy) is the most derived life history. Analysis of egg data for 140 species (excluding viviparity and facultative planktotrophy) indicated a bimodal distribution in egg volume corresponding to planktotrophy and lecithotrophy + ovoviviparity, with three significant egg size groups due to the very large eggs of the ovoviviparous species. The marked reduction in fecundity in species with extremely large eggs is exemplified by the ovoviviparous species. Egg size in the two species with facultative planktotrophy were intermediate with respect to the two modes. Identifying the ancestral larval life history pattern and the pathways in the switch from feeding to non-feeding larvae is complicated by the two patterns of metamorphosis seen in species with planktotrophic development: Type I (ophiopluteus only) and Type II (ophiopluteus + vitellaria larva). The variability in arm resorption at metamorphosis across ophiuroid families indicates that the Type I and II patterns may be two ends of a morphological continuum. This variability indicates ancestral morphological plasticity at metamorphosis followed by canalization in some taxa to the vitellaria as the metamorphic larva. Vestigial ophiopluteal traits in lecithotrophic ophioplutei and vitellaria indicate evolution from the ancestral (feeding larva) state. Parental care has evolved many times from an ancestor that had a planktonic ophiopluteus or vitellaria and is often associated with hermaphroditism and paedomorphosis. A secondary reduction in egg size occurred in the viviparous species.

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Evo-Devo in Ophiuroids: The Switch from Planktotrophy to Lecithotrophy in Ophionereis

Cited by 2 publications

References 50 publications

Evo‐devo in the ophiuroid family Ophiocomidae

Evo‐devo in the ophiuroid family Ophiocomidae

Evolution of Maternal Provisioning and Development in the Ophiuroidea: Egg Size, Larval Form, and Parental Care

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