First record of Thylaeodus (Gastropoda: Vermetidae) from the Equatorial Atlantic Ocean, with the description of a new species

Spotorno, Paula; Simone, Luiz Ricardo L.

doi:10.1590/s1984-46702013000100011

Cited by 3 publications

(1 citation statement)

References 13 publications

(16 reference statements)

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“…both from a molecular and morphological analyses. Thylaeodus equatorialis Spotorno and Simone, 2013, a species endemic to the São Pedro and São Paulo Archipelago, located at the mid-equatorial Atlantic Ocean (Spotorno & Simone, 2013), is the unique known Thylaeodus to the Brazilian coast and is easily distinguished by shell sculpture.…”

Section: Discussionmentioning

confidence: 99%

Molluscs From the Upper Mesophotic Zone in a Scarcely Known Reef of the Western Equatorial Atlantic

Freitas

Spotorno²,

Tâmega³

et al. 2021

ACMAR

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Despite the increasing focus on biodiversity of mesophotic coral ecosystems (MCEs) on a global scale, some biological groups, such as molluscs, are still poorly investigated. The taxonomic diversity of the molluscan fauna of a scarcely known MCE of the Western Equatorial Atlantic, Northeastern Brazil, was surveyed. Samples were collected along the shallower strata of the upper mesophotic zone (between 33-36 m depth). Twenty-one taxa (nine species of gastropods, ten species of bivalves, and two taxa of chitons) were listed, two of which (Novastoa sp. and Thylaeodus sp.) are potential endemic species. A new northern limit of distribution of Persicula moscatellii was established and seven species had new bathymetric records for living specimens (Barbatia domingensis, Barbatia cancellaria, Lamychaena hians, Leiosolenus bisulcatus, Pinctada imbricata, Hipponix incurvus, and Persicula moscatellii). Hipponix costellatus are the most representative species with 49 individuals, followed by Lima caribaea with six individuals. The present work is the first contribution to the knowledge of the molluscan fauna associated with consolidated substrates from this little-known MCE. Keywords: mesophotic coral ecosystems, tropical reef, molluscan diversity, Brazilian Province, conventional SCUBA.

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Section: Discussionmentioning

confidence: 99%

Molluscs From the Upper Mesophotic Zone in a Scarcely Known Reef of the Western Equatorial Atlantic

Freitas

Spotorno²,

Tâmega³

et al. 2021

ACMAR

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Brood Reduction, Not Poecilogony, in a Vermetid Gastropod with Two Developmental Outcomes within Egg Capsules

Strathmann

Hadfield

2018

The Biological Bulletin

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A small vermetid gastropod broods capsules containing nurse eggs and embryos that develop into small veligers. A few of these veligers continue development and growth while nurse eggs and developmentally arrested sibling veligers disappear. Survivors hatch as crawling pediveligers and juveniles. None of the veligers, if removed from capsules, swim in a directed way or withdraw into their shells, indicating that even the developing veligers are unsuited for extracapsular life until they can crawl. The shells of arrested veligers decalcify while their siblings grow. Few of the developmentally arrested veligers that were isolated from siblings and fed algal cells resumed detectable growth. Nurse eggs rather than cannibalism provide most of the food, but full growth of developing veligers depends on limited sharing; arrest of some siblings is a necessary adjunct of the nurse-egg feeding. Here, two developmental outcomes for larvae produced by developmental arrest of some (often termed poecilogony) serves instead as a means of brood reduction. Brood reduction is often attributed to family conflicts resulting from genetic differences. Another hypothesis is that a mother who cannot accurately sort numbers of nurse eggs and developing eggs into capsules could rely on brood reduction to adjust food for her offspring. At the extreme, an entirely random packaging would produce a binomial distribution of embryos in capsules, a very uneven distribution of food per embryo, and some capsules with no embryos. Males have yet to be found in this species, but even if reproduction is asexual, selection could still favor brood reduction.

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Catalogue of the type specimens deposited in the Mollusca Collection of the Museu Nacional / UFRJ, Rio de Janeiro, Brazil

Pimenta

Monteiro

Barbosa

et al. 2014

Zootaxa

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A curatorial revision of the type specimens deposited in the Mollusca Collection of the Museu Nacional / UFRJ, Rio de Janeiro, Brazil (MNRJ) revealed the existence of 518 lots of type specimens (holotypes, neotypes, syntypes and paratypes) for 285 names of molluscan taxa from 88 families, including 247 gastropods, 30 bivalves, three cephalopods and five scaphopods. A total of 106 holotypes and one neotype are deposited in the MNRJ. Type material for ten nominal taxa described as being deposited in the MNRJ was not located; the probable reasons are discussed. Some previously published erroneous information about types in the MNRJ is rectified. A total of 37 type specimens are illustrated.

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First record of Thylaeodus (Gastropoda: Vermetidae) from the Equatorial Atlantic Ocean, with the description of a new species

Cited by 3 publications

References 13 publications

Molluscs From the Upper Mesophotic Zone in a Scarcely Known Reef of the Western Equatorial Atlantic

Molluscs From the Upper Mesophotic Zone in a Scarcely Known Reef of the Western Equatorial Atlantic

Brood Reduction, Not Poecilogony, in a Vermetid Gastropod with Two Developmental Outcomes within Egg Capsules

Catalogue of the type specimens deposited in the Mollusca Collection of the Museu Nacional / UFRJ, Rio de Janeiro, Brazil

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