Radular ultrastructure of South American Ampullariidae (Gastropoda: Prosobranchia)

Martín, Santiago; Negrete, Lisandro

doi:10.1590/s1519-69842007000400019

Cited by 12 publications

(5 citation statements)

References 8 publications

(6 reference statements)

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“…The operculum of P. maculata is also much thicker and more inflexible than that of P. canaliculata , creating a much less effective seal. Regarding alimentary system characters, previous authors have noted subtle differences in radula morphology among distantly related species within the genus Pomacea and among genera (Berthold, 1991; Martín & Negrette, 2007). In general, the rachidian base differs between the two species and the tooth cusps are generally broader, thicker, and more robust in P. canaliculata .…”

Section: Discussionmentioning

confidence: 99%

Comparing apples with apples: clarifying the identities of two highly invasive Neotropical Ampullariidae (Caenogastropoda)

Hayes

Cowie

Thiengo

et al. 2012

Zoological Journal of the Linnean Society

171

164

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Ampullariidae comprises two lineages of freshwater gastropods: one Old World and one New World. Recent molecular work confirmed the monophyly of the family and began to clarify generic relationships, but current systematics remains unsatisfactory. With more than 300 available species group names for New World taxa alone, taxonomic confusion is rampant, as illustrated by two species that have been introduced widely and are difficult to differentiate conchologically, Pomacea maculata Perry, 1810 and Pomacea canaliculata (Lamarck, 1822). Misidentification hampers efforts to manage their spread and impacts as invasives, and prevents meaningful comparative analyses of their biology. Here we clarify the taxonomy, describe the morphological and genetic distinctiveness of the two species, and re-evaluate their biogeographic ranges. They differ most clearly genetically, with no shared haplotypes and a mean genetic distance of 0.135 at cytochrome c oxidase subunit I (COI). Differences in shell morphology are most obvious in recently hatched juveniles; the number of eggs per clutch is higher in P. maculata, and the individual eggs are smaller, so P. canaliculata hatchlings are nearly twice as large as those of P. maculata. Adult shells differ primarily in the angulation of the whorl shoulder and pigmentation of the inner pallial lip, with the latter a distinctive feature of P. maculata. They also differ in reproductive anatomy, most notably in P. canaliculata having two distinctive glandular tissues in the apical penial sheath gland, and P. maculata lacking a medial sheath gland but possessing a basal sheath gland. Pomacea canaliculata is restricted to a narrower southern range, whereas P. maculata ranges extensively throughout much of South America. Ampullaria gigas Spix, 1827 and Ampullaria insularum d'Orbigny, 1835 are herein synonymized with P. maculata. Neotypes are designated for P. maculata and A. gigas, and a lectotype is designated for A. insularum. A neotype is designated for P. canaliculata.

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Section: Discussionmentioning

confidence: 99%

Comparing apples with apples: clarifying the identities of two highly invasive Neotropical Ampullariidae (Caenogastropoda)

Hayes

Cowie

Thiengo

et al. 2012

Zoological Journal of the Linnean Society

171

164

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“…In fact details of cusp morphology within a family, genus or group of closely related species are more variable and exhibit more superimposed fine details than tooth bases or shafts. For example, Martin & Negrete () separated five genera of taeniogloss Ampullariidae (prosobranchs) based solely on the morphology of the central rhachidian tooth. But also at the larger scale (e.g.…”

Section: Discussionmentioning

confidence: 99%

Key innovations in Mesozoic ammonoids: the multicuspidate radula and the calcified aptychus

Keupp¹,

Hoffmann

Stevens

et al. 2016

Palaeontology

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A nearly complete radula with seven elements per row preserved inside of an isolated, bivalved, calcitic lower jaw (= aptychus) of the Late Jurassic ammonite Aspidoceras is described from the Fossillagerst€ atte Painten (Bavaria, southern Germany). It is the largest known ammonite radula and the first record for the Perisphinctoidea. The multicuspidate tooth elements (ctenodont type of radula) present short cusps. Owing to significant morphological differences between known aptychophoran ammonoid radulae, their possible function is discussed, partly in comparison with modern cephalopod and gastropod radulae. Analogies between the evolution of the pharyngeal jaws of cichlid fishes and the ammonoid buccal apparatus raise the possibility that the evolution of a multicuspidate radula allowed for a functional decoupling of the aptychophoran ammonoid jaw. The radula, therefore, represents a key innovation which allowed for the evolution of the calcified lower jaws in Jurassic and Cretaceous aptychophoran ammonites. Possible triggers for this morphological change during the early Toarcian are discussed. Finally, we hypothesize potential adaptations of ammonoids to different feeding niches based on radular tooth morphologies.

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“…Most of these studies were carried out on small sized pulmonates that are usually considered as microphytophagous and detritivorous grazer-scrapers thriving on algae, detritus and senescent plant material (Dillon, 2000;Pyron & Brown, 2015). On the other hand, apple snails (Ampullariidae) are large snails mostly with macrophytophagous habits (Cazzaniga & Estebenet, 1984;Cowie, 2002;Marchese et al, 2014;Hayes et al, 2015) and they possess very powerful jaws and radula with which they shred living macrophyte tissues (Andrews, 1965;Moretto & Nahabedian, 1989;Martín & Negrete, 2007). They also possess a strongly muscular and cuticularized gizzard in the stomach (Andrews, 1965) and high levels of enzymatic activity in different parts of their digestive tract (Godoy et al, 2013;Luo et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Effects of Ingestion of Lithic Particles on Growth of the Apple SnailPomacea canaliculata(Caenogastropoda, Ampullariidae)

Manara¹,

Saveanu²,

Martín³

2016

Malacologia

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Lithic particles are a common feature in the digestive tract of freshwater snails. Their role in the digestive processes has been demonstrated in some microphytophagous and detritivorous species, as they enhance growth, assimilation and reproduction. It has been suggested that they could have the same function in Pomacea canaliculata, a macrophytophagous apple snail with powerful jaws and radula, a strongly muscular and cuticularized gizzard and high levels of enzymatic activity. Our aims were to investigate the occurrence of lithic elements in the digestive tract of P. canaliculata snails from natural populations through the analyses of digestive contents, as well as the effect of size and availability of lithic particles on growth and growth efficiency through laboratory experiments. Lithic particles are very common in the digestive tract of P. canaliculata from natural populations and from laboratory aquaria if they are available in the immediate environment. Such particles are not retained or concentrated differentially in the stomach and they are apparently totally lost in less than four weeks if the supply is interrupted. The frequency of plant material and lithic particles increases from mouth to anus indicating that the retention time increases in the same way. Sand and plant material frequently co-occur in the intestine and in the stomach indicating that both are ingested together. Ground marble had negative effects on the growth of P. canaliculata probably due to the sharp edges and pointed ends of these particles. The availability of natural lithic particles (sand) had a positive effect on growth and also a synergic interaction with the availability of food. The growth efficiency was 25.2% higher when sand was available than when it was absent. These effects were more marked in juvenile females than in juvenile males. Our results indicate that growth rates may be underestimated under laboratory conditions if lithic particles are not supplied regularly and that their presence should be standardized to allow reliable comparisons between studies. Our results also indicate that the effects of food availability and plant palatability on the growth of P. canaliculata may be modulated by the presence of lithic particles and this may in turn affect the outcome of interactions between apple snails, other snails and macrophytes.

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Radular ultrastructure of South American Ampullariidae (Gastropoda: Prosobranchia)

Cited by 12 publications

References 8 publications

Comparing apples with apples: clarifying the identities of two highly invasive Neotropical Ampullariidae (Caenogastropoda)

Comparing apples with apples: clarifying the identities of two highly invasive Neotropical Ampullariidae (Caenogastropoda)

Key innovations in Mesozoic ammonoids: the multicuspidate radula and the calcified aptychus

Effects of Ingestion of Lithic Particles on Growth of the Apple SnailPomacea canaliculata(Caenogastropoda, Ampullariidae)

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