Development of the sea-star Ctenopleura fisheri

Komatsu, Miéko

doi:10.1007/bf00397194

Cited by 25 publications

(14 citation statements)

References 11 publications

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“…In life cycles with larval stages, a brachiolaria (or some modified life cycle that presumably once included a brachiolaria) is unknown only in the three studied paxillosidans, Luidia, Astropecten and Ctenopleura fisheri (Komatsu, 1982); the significance of this fact has been the subject of continued and ultimately unresolved controversy. Fell (1948Fell ( , 1967 summarized arguments, including a debate in the literature primarily involving Th.…”

Section: Caymanosteua)mentioning

confidence: 99%

A classification and phylogeny of post-Palaeozoic sea stars (Asteroidea: Echinodermata)

Blake

1987

Journal of Natural History

148

274

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A revised classification and phylogeny at the family level and above are presented for post-Palaeozoic sea stars. Monophyly of the group is established by a character suite taken from the ambulacral column that thus far has been recognized in only one Palaeozoic genus. Compared to earlier studies, character selection here placed relatively greater emphasis on morphology and arrangement of ossicles and ossicular systems. Functional implications of many features are surveyed. Thirtyfour families, three extinct, are recognized and a number of older familial concepts are suppressed; the extinct Trichasteropsidae is proposed. Superfamilies are recognized for the Valvatida. Eight orders, including the new, extinct Trichasteropsida, and three superorders are recognized. No living sea star is primitive in the sense of being close to ancestral sea stars and other echinoderm groups; the Paxillosida, which commonly has been considered primitive, is here considered specialized.

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Section: Caymanosteua)mentioning

confidence: 99%

A classification and phylogeny of post-Palaeozoic sea stars (Asteroidea: Echinodermata)

Blake

1987

Journal of Natural History

148

274

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“…Examples of similarities between pelagic and brooded asteroid larvae include, respectively: Asterina bathen' and Asterina comnata japonica vs. Astarina psdoem&ap&ca; (Kano & Komatsu, 1978;Komatsu, 1975a;Komatsu, Kano & Oguro, 1990), Patiklla pnni and f! Comparisons between related species with pelagic, nonfeeding development and benthic nonfeeding development show few morphological and functional differences.…”

Section: Functional Band Of Habitat Shtftsmentioning

confidence: 99%

Relationships among development, ecology, and morphology in the evolution of Echinoderm larvae and life cycles

McEdward

1997

Biological Journal of the Linnean Society

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“…Comparisons between related species with pelagic, nonfeeding development and benthic nonfeeding development show few morphological and functional differences. Examples of similarities between pelagic and brooded asteroid larvae include, respectively: Asterina bathen' and Asterina comnata japonica vs. Astarina psdoem&ap&ca; (Kano & Komatsu, 1978;Komatsu, 1975a;Komatsu, Kano & Oguro, 1990), Patiklla pnni and f! cakar vs. Patiriella em&a (Byrne, 1991(Byrne, , 1995 and Hen& lariuscula vs. Hen& sp.…”

Section: Functional Band Of Habitat Shtftsmentioning

confidence: 98%

Relationships among development, ecology, and morphology in the evolution of Echinoderm larvae and life cycles

McEdward

Janies

1997

Biological Journal of the Linnean Society

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Rcceiwd 1 9 Januaty 1996; accc,&tcdforpubluahon 3 3 u m 1 9 9 6 @ and The evolution of lie cycles involves transitions between discrete states in one or more of the Characters that comprise a developmental pattern. In this paper, we examine three of the major life cycle characters and the states for these characters. Using examples from echinoderms, we discuss the evolutionary transitions that have occurred in the type of morphogenesiis, developmental habitat, and mode of nutrition during development. We evaluate the functional requirements associated with these transitions to infer the likelihood (frequency or rapidity) of change in a given character and of biases in the polarity of character state transitions. Using comparisons of closely related species, we evaluate the change between states in one character for dependence on the state of, or correlated changes in, other characters. Based on our analysis of congeneric species that differ in developmental habitat, we conclude that the transition between pelagic and benthic development is an ecological change that is independent of changes in morphogenesis and should be reversible. In contrast, the transition from feeding to nonfeeding development has been considered to be irreversible because it involves marked changes in larval morphology. We re-examine the transition between different modes of larval nutrition in light of recent studies that show that there exists a continuum of nutritional strategies between planktotrophy and lecithotrophy. This continuum is largely determined by variation in m a t e d investment and does not involve alterations in larval morphology. We suggest that the boundary between planktotrophy and lecithotrophy is frequently crossed and that this transition is reversible. Ecological changes represent the crossiing of a functional threshold. Only after crossing the threshold, do larvae experience qualitatively different selective pressures that can lead to subsequent changes in morphology and development. Two different changes have occurred in the type of morphogenesis: the simplification of larval morphology that is associated with obligate (nonfeeding) lecithotrophy and the loss of the larval body plan in the evolution from indirect to direct development. It is the modification of morphology independent of the ecological changes that requires alterations in developmental processes, constrains evolutionary options, imposes irreversibility, and establishes the discrete nature of larval patterns in marine invertebrates.

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Development of the sea-star Ctenopleura fisheri

Cited by 25 publications

References 11 publications

A classification and phylogeny of post-Palaeozoic sea stars (Asteroidea: Echinodermata)

A classification and phylogeny of post-Palaeozoic sea stars (Asteroidea: Echinodermata)

Relationships among development, ecology, and morphology in the evolution of Echinoderm larvae and life cycles

Relationships among development, ecology, and morphology in the evolution of Echinoderm larvae and life cycles

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