Brood care among basommatophorans: a unique reproductive strategy in the freshwater limpet snail <i>Protancylus</i> (Heterobranchia: Protancylidae), endemic to ancient lakes on Sulawesi, Indonesia

Albrecht, Christian; Glaubrecht, Matthias

doi:10.1111/j.1463-6395.2006.00219.x

Cited by 15 publications

(7 citation statements)

References 53 publications

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“…The recent phylogeny suggests a close phylogenetic relationship between Protancylus and Glyptophysa . Protancylus , an ancient lake endemic from Sulawesi with an aberrant life‐history strategy and morphological pecularities (Albrecht & Glaubrecht 2006), shows definite Australian biogeographical affinities and probably does not deserve family status as proposed by Boss (1982). Both Kessneria and Leichhardtia have a funnel/siphon attached to the pneumostome and are similar in other morphological features (Walker & Ponder 2001).…”

Section: Discussionmentioning

confidence: 99%

A molecular phylogeny of Planorboidea (Gastropoda, Pulmonata): insights from enhanced taxon sampling

Albrecht¹,

Kuhn²,

Streit³

2006

Zoologica Scripta

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Planorbid gastropods are the most diverse group of limnic pulmonates, with both discoidal and highspired taxa. Phylogenetic relationships among these genera are confused and controversial. In particular, the monophyly of the limpet‐like taxa (traditionally Ancylidae) is disputed. Even recent molecular studies have concluded that substantially more work is necessary to solve the remaining issues concerning intergeneric phylogenetic relationships and higher taxa systematics. Planorbid snails are of great significance for humans as several members of this group are intermediate hosts of blood flukes (schistosomes) causing a chronic disease, schistosomiasis. We used the two independent molecular markers COI and 18S (concatenated dataset of 2837 nucleotide bp) to infer phylogenetic relationships of 26 genera (27 species) of Planorboidea, represented mostly by type species from mainly topotypical populations. With the majority of the taxa discussed not having been studied previously, this study attempted to test several hypotheses on planorbid phylogenetic relationships using Bayesian inference techniques. The monophyly of Planorboidea (= ‘Ancyloplanorbidae’) is strongly suggested on the basis of our extensive molecular analysis. Besides a distinct Burnupia clade, two major clades were recovered that correspond to family level taxa (traditional Bulinidae and Planorbidae). Considerable rearrangements of suprageneric taxa are evident from the phylogeny inferred. Therefore, the only clades recognized by current classifications and supported by our analysis are Planorbini and Segmentinini. The present study found that Ancylidae as traditionally understood, i.e. covering most freshwater limpet gastropods, is paraphyletic, as the genera of Burnupia and Protancylus have been shown to lie phylogenetically outside the Ancylini. Chromosome numbers and levels of polyploidy are discussed in the light of the new phylogeny. An earlier theory of shell shape evolution, i.e. that of patelliform taxa being most advanced, was not supported by this study; a limpet‐shaped taxon is most basal within Planorboidea. Although many taxa still remain to be studied, our results will hopefully contribute towards a better understanding of this very important group of freshwater organisms. Some taxonomic implications are discussed.

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Section: Discussionmentioning

confidence: 99%

A molecular phylogeny of Planorboidea (Gastropoda, Pulmonata): insights from enhanced taxon sampling

Albrecht¹,

Kuhn²,

Streit³

2006

Zoologica Scripta

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“…Brooding is rare and has only been documented in a planorbid limpet (Albrecht & Glaubrecht, 2006), and some glacidorbids (Ponder, 1986;Ponder & Avern, 2000).…”

Section: Taxonomic Compositionmentioning

confidence: 99%

Global diversity of gastropods (Gastropoda; Mollusca) in freshwater

et al. 2007

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The world's gastropod fauna from continental waters comprises ~ 4,000 valid described species and a minimum of 33-38 independent lineages of Recent Neritimorpha, Caenogastropoda and Heterobranchia (including the Pulmonata). The caenogastropod component dominates in terms of species richness and diversity of morphology, physiology, life and reproductive modes and has produced several highly speciose endemic radiations. Ancient oligotrophic lakes (e.g., Baikal, Ohrid, Tanganyika) are key hotspots of gastropod diversity; also noteworthy are a number of lower river basins (e.g., Congo, Mekong, Mobile Bay). But unlike many other invertebrates, small streams, springs and groundwater systems have produced the most speciose associations of freshwater gastropods. Despite their ecological importance in many aquatic ecosystems, understanding of even their systematics is discouragingly incomplete. The world's freshwater gastropod fauna faces unprecedented threats from habitat loss and degradation and introduced fishes and other pests. Unsustainable use of ground water, landscape modification and stock damage are destroying many streams and springs in rural/ pastoral areas, and pose the most significant threats to the large diversity of narrow range endemics in springs and ground water. Despite comprising only ~5% of the world's gastropod fauna, freshwater gastropods account for ~ 20% of recorded mollusc extinctions. However, the status of the great majority of taxa is unknown, a situation that is exacerbated by a lack of experts and critical baseline data relating to distribution, abundance, basic life history, physiology, morphology and diet. Thus, the already considerable magnitude of extinction and high levels of threat indicated by the lUCN Red List of Threatened Species is certainly a significant underestimate.

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“…In the Sulawesi lakes, Protancylus Sarasin & Sarasin, 1898, a shell-dweller on Tylomelania (cf. Albrecht & Glaubrecht, 2006), is endemic with a single species each in the Malili lakes and Lake Poso. In addition there are in the latter two endemic genera, viz.…”

Section: The Biological Species Concept and Species Recognition In Tymentioning

confidence: 99%

Ancient lakes as hotspots of diversity: a morphological review of an endemic species flock of Tylomelania (Gastropoda: Cerithioidea: Pachychilidae) in the Malili lake system on Sulawesi, Indonesia

2007

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The viviparous freshwater gastropod Tylomelania (Caenogastropoda: Cerithioidea: Pachychilidae) endemic to the Indonesian island Sulawesi has radiated extensively in two ancient lake systems. We here present the first systematic species-level review of taxa in the five lakes of the Malili lake system, which contains the most diverse and best studied freshwater fauna on Sulawesi. Our results indicate a significantly higher diversity of Tylomelania in these lakes than previously perceived based on morphological evidence for delimiting the taxa. We describe nine new species, thus increasing the number of taxa known from the Malili lakes to 25. Tylomelania species are inhabiting all available substrates in the lakes, and the diversity of habitats is reflected in an unparalleled range of radula types in this closely related group. Several species show a high intraspecific variability in some characters, and their closer investigation will probably lead to the discovery of more cryptic species. As it is, this species flock on Sulawesi is among the largest freshwater mollusc radiations known. Since the Malili lake system also contains other large endemic species flocks of e.g. crustaceans and fishes, it is a major hotspot of freshwater biodiversity in Asia to become a conservation priority.

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Brood care among basommatophorans: a unique reproductive strategy in the freshwater limpet snail Protancylus (Heterobranchia: Protancylidae), endemic to ancient lakes on Sulawesi, Indonesia

Cited by 15 publications

References 53 publications

A molecular phylogeny of Planorboidea (Gastropoda, Pulmonata): insights from enhanced taxon sampling

A molecular phylogeny of Planorboidea (Gastropoda, Pulmonata): insights from enhanced taxon sampling

Global diversity of gastropods (Gastropoda; Mollusca) in freshwater

Ancient lakes as hotspots of diversity: a morphological review of an endemic species flock of Tylomelania (Gastropoda: Cerithioidea: Pachychilidae) in the Malili lake system on Sulawesi, Indonesia

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