Morphological changes in<i>Onithochiton neglectus</i>Rochebrune, 1881 (Mollusca: Chitonidae), and their taxonomic significance

O'Neill, M. H. B.

doi:10.1080/03014223.1984.10428226

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…L. fernaldi, and L. thomasi are like other chiton brooders, retaining embryos in the paired pallial grooves to an advanced stage of development. Brooding is known with certainty for about 30 (out of about 800 total) chiton species as compiled by Pearse (1979) and added to by Sirenko (1973), Penprase (1979), O'Neill (1984, Burn (1984), Cochran (1986), Creese (1986), Kaas and Strack (1986), Creese and O'Neill (1987), and the present study. Additionally, there are at least a few chiton species that neither free spawn nor brood.…”

Section: Discussionmentioning

confidence: 60%

Reproductive Patterns in Six Species ofLepidochitona(Mollusca: Polyplacophora) from the Pacific Coast of North America

Eernisse¹

1988

The Biological Bulletin

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Reproductive patterns are documented and compared in six morphologically similar members of the chiton genus Lepidochitona from the west coast of North America (Oregonian and Californian Provinces). Three of the six species studied brood embryos: L. thomasi (Pilsbry, 1898), L. cavema Eernisse, 1986, and L. fernaldi Eernisse, 1986. The offspring of brooders are able to crawl away. In contrast, L. denliens (Gould, 1846), L. hartwegii (Carpenter, 1855), and the less common L. berryana Eernisse, 1986 are free spawners whose offspring are obligate dispersers. The dispersal consequences of brooding or not brooding are exemplified by Lepidochitona. without major complications due to differences in larval size or larval feeding ability. Developmentally, brooders and free spawners in Lepidochitona differ primarily in stage (i.e., age) at which larvae hatch from their egg capsules. Larval size and morphology differences are present but not as extreme as in other taxa.As in many other taxa there is a link between brooding and particular life history traits, especially small adult size and self-fertilization. Size comparisons match the expectation that, as adults, brooders are generally as small or smaller than free spawners. The two smallest of the three brooders, L. cavema and L. femaldi. are also simultaneous hermaphrodites, based on examination of gonads. These are the only known hermaphroditic chiton species, and are apparently fully capable of self-fertilizing multiple broods based on evidence from animals isolated for up to nine months in the laboratory. The third brooder, L. thomasi, is more typical of chiton species including those that brood; it has separate sexes and does not produce viable broods in isolation. Based on comparisons among chitons and among other groups

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Section: Discussionmentioning

confidence: 60%

Reproductive Patterns in Six Species ofLepidochitona(Mollusca: Polyplacophora) from the Pacific Coast of North America

Eernisse¹

1988

The Biological Bulletin

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“…Information on the age variability of shell shields, perinotum armament, radula teeth, and gills in chitons is very important in identification of the taxa. However, there are relatively few works devoted to these problems [Sirenko, Minichev, 1975;O'Neill, 1984;Sirenko, 1990Sirenko, ,1992Sirenko, , 2014Sirenko et al, 2016Sirenko et al, , 2022. The only sample from the Banda Sea collected by the expedition on the R/V Vityaz contained chitons of different age groups, which allowed determination of their age variability.…”

Section: Introductionmentioning

confidence: 99%

Indonesian chitons of the genera Belknapchiton Sirenko, Saito et Schwabe, 2022 and Leptochiton Gray, 1847(Mollusca: Polyplacophora: Leptochitonidae)

Sirenko

2023

Ruthenica

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On the basis of the collections of the R/V Vityaz in the Banda Sea, Indonesia, a review of the chiton fauna of the genera Belknapchiton and Leptochiton was carried out. Leptochiton commandorensis , until now known only from the northern Pacific near the Commander Islands, is here added to the four known Indonesian deep sea species. This species turned out to be with juveniles in the pallial groove. A scanning electron microscope study of the collected specimens of B. giganteus made a corrected, supplemented description of this rare species possible. The age variability of the valves shape and shell sculpture of the two collected species was studied. Particular attention is paid to the age variability of the number of micraesthetes on the tegmentum grains and the position of the mucro.

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“…Chiton torri (Suter) from Stewart Island also broods its young (Bullock, quoted in Pearse 1979), although no details are given. Finally, O'Neill (1984) refers to some Onithochiton neglect us de Rochebrune with brooded embryos which were located in the collection of the Edward Percival Field Station (Kaikoura).…”

Section: Introductionmentioning

confidence: 99%

Brooding behaviour and larval development in the New Zealand chiton,Onithochiton neglectusde Rochebrune (Mollusca: Polyplacophora).

Creese

1986

New Zealand Journal of Zoology

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The chiton Onithochiton neglectus is widespread throughout New Zealand, occurring under boulders down to at least 20 m depth. Several populations in the vicinity of Leigh, on the northeastern coast of the North Island, were monitored for 2 years. Brooding individuals were found in many of these samples, and on present evidence, brooding apparently occurs in all seasons except winter (June to August).Female O. neglectus brood their eggs in the pallial grooves, the number of eggs varying widely from several hundred to several thousand. The embryos from several brooders were collected and reared in the laboratory. These were then used to describe the developmental stages of O. neglect us. Embryos undergo most of their development inside a capsule (chorion), but are released after 12-15 days as well developed trochophores which retain some swimming ability. Settlement occurs within hours of hatching, and is almost immediate if a suitable substratum is available.

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Morphological changes inOnithochiton neglectusRochebrune, 1881 (Mollusca: Chitonidae), and their taxonomic significance

Cited by 7 publications

References 3 publications

Reproductive Patterns in Six Species ofLepidochitona(Mollusca: Polyplacophora) from the Pacific Coast of North America

Reproductive Patterns in Six Species ofLepidochitona(Mollusca: Polyplacophora) from the Pacific Coast of North America

Indonesian chitons of the genera Belknapchiton Sirenko, Saito et Schwabe, 2022 and Leptochiton Gray, 1847(Mollusca: Polyplacophora: Leptochitonidae)

Brooding behaviour and larval development in the New Zealand chiton,Onithochiton neglectusde Rochebrune (Mollusca: Polyplacophora).

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