Observations on the Biology of Some Sublittoral Prosobranchs

“…Descriptions of the veliger larva, its prodisoconch, and certain observations concerning the larval ecology and feeding behaviour in the planktotrophic veliger of the cerithiacean Mesogastropod Turritella communis Risso 1826 have been detailed in a number of papers, including Fretter & Manly (1979); Fretter & Montgomery (1968); Fretter & Pilkington (1970); Fretter & Shale (1973); Fretter & Graham (1981); Lebour (1933); Richter & Thorson (1975); Thiriot-Quievreux (1969); Thorson (1946) and Verduin (1977). However, only Lebour (loc.…”

Section: Introductionmentioning

confidence: 99%

The encapsular developmental sequence of the mesogastropod Turritella communis (Gastropoda: Turritellidae)

Kennedy

Keegan²

1992

J. Mar. Biol. Ass.

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The development of the lecithotrophic encapsulated larva of the internally-fertilizing, sublittoral gastropod Turritella communis Risso 1826 was documented using scanning electron microscopy and light microscopy. Encapsulated development was completed in 12 days at 15°C in the laboratory. Spawning occurred above ~10°C. Spawn masses consisted of numerous gelatinous egg capsules, each of which contained ~28 eggs, encased in albumen and fertilizing sperm. The eggs had an average diameter of 139 μm. Fertilization was accomplished by unpaired eupyrene sperm and occurred at the germinal vesicle stage. The developmental sequence followed the typical gastropod pattern, but was unique in a number of respects. Polar lobes were produced during meiotic maturation and early cleavage, with an especially large lobe occurring in association with the first cleavage, which was unequal. The blastula developed into a dorso-ventrally flattened placula at the 70-cell stage. Gastrulation occurred through invagination and epiboly acting together, and was uniquely accompanied by the development of ectodermal microvilli measuring ~ 1 μm in length. Extra-embryonic albumen began to be depleted after the development of the microvilli. It is proposed that the ciliated telotrochal cells gave rise to the pair of statocysts. Torsion was additionally observed to be facilitated by the growth of pre-mantle tissue on the right side and retardation of growth on the left side.

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“…These findings support previous observations of sexual dimorphism in other Turritellidae (Allmon, 1988;Kennedy, 1995) and separate sexes for Maoricolpus roseus (Allmon, 1988;Bax et al, 2003). Hermaphroditism is atypical in 'prosobranchs' (Fretter, 1984), although it has been described in some other gastropods (e.g. Calvo & Templado, 2005;Richter & Luque, 2004) and in the native turritellid Gazameda gunnii (Carrick, 1980).…”

Section: Population Characteristics Of M Roseusmentioning

confidence: 99%

Population characteristics and planktonic larval stage of the New Zealand screwshell Maoricolpus roseus

Probst

Crawford

2008

Journal of Molluscan Studies

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Maoricolpus roseus is believed to have been introduced into Tasmania in the 1920s. Despite its wide distribution, dense populations and being considered successful in colonizing and altering several habitats, details of its reproduction and life cycle are not known. Specimens collected from the D'Entrecasteaux Channel (SE Tasmania) over 2 years showed sexual dimorphism with females relatively larger than males. A 1:1 sex ratio was observed and females were found carrying encapsulated larvae throughout consecutive austral summer seasons (September or October till February), with up to 70% of females carrying larvae. Larvae released from egg capsules were planktonic, all relatively well developed, and fed on microalgae, indicating that the species has planktotrophic development, and suggesting high potential for dispersal. This information is important for the development of management strategies to control this invasive species.

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Observations on the Biology of Some Sublittoral Prosobranchs

Cited by 11 publications

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Manipulating Interaction Strengths and the Consequences for Trivariate Patterns in a Marine Food Web

Manipulating Interaction Strengths and the Consequences for Trivariate Patterns in a Marine Food Web

The encapsular developmental sequence of the mesogastropod Turritella communis (Gastropoda: Turritellidae)

Population characteristics and planktonic larval stage of the New Zealand screwshell Maoricolpus roseus

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