Evolutionary relationships of euthyneuran gastropods (Mollusca): a cladistic re-evaluation of morphological characters

Dayrat, Benoı̂t; Tillier, Simon

doi:10.1046/j.1096-3642.2002.00018.x

Cited by 93 publications

(136 citation statements)

References 196 publications

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“…Solem (1978) classified Onchidiidae, Veronicellidae, and Rathouisiidae in the Systellommatophora. Dayrat and Tillier (2002) could not find synapomorphies to support the monophyly of Systellommatophora. The pedal gland at the bottom of the anterior visceral cavity (exclusively found in onchidiids and veronicellids) could be a diagnostic synapomorphy of Systellommatophora; also, the presence of eyes at the tip of the cephalic tentacles could have been acquired twice independently (once in the common ancestral lineage to Systellommatophora, and once in the common ancestral lineage to Stylommatophora).…”

Section: Evolution Of Systellomatophoramentioning

confidence: 80%

“…More recently, Otina was considered to be closely related to onchidiid and veronicellid slugs (Haszprunar and Huber, 1990) or stylommatophorans (Tillier and Ponder, 1992). Dayrat and Tillier (2002) showed that morphological data fail to resolve the relationships of Otina. The opening of the membrane gland into the carrefour (Dayrat and Tillier, 2002), which is found only in some (but not all) ellobiids and Otina, is a potential synapomorphy for that clade.…”

Section: Evolution Of Ellobiidae (Including Otina Smeagol Trimusculus)mentioning

confidence: 99%

“…Dayrat and Tillier (2002) showed that morphological data fail to resolve the relationships of Otina. The opening of the membrane gland into the carrefour (Dayrat and Tillier, 2002), which is found only in some (but not all) ellobiids and Otina, is a potential synapomorphy for that clade. Otina and ellobiids also share a gizzard-like structure in the stomach (also found in Hygrophila, in which it was likely gained independently); Trimusculus, which lacks this stomach structure, may have lost it secondarily.…”

Section: Evolution Of Ellobiidae (Including Otina Smeagol Trimusculus)mentioning

confidence: 99%

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Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Dayrat

Conrad

Balayan

et al. 2011

Molecular Phylogenetics and Evolution

143

182

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Section: Evolution Of Systellomatophoramentioning

confidence: 80%

Section: Evolution Of Ellobiidae (Including Otina Smeagol Trimusculus)mentioning

confidence: 99%

Section: Evolution Of Ellobiidae (Including Otina Smeagol Trimusculus)mentioning

confidence: 99%

See 1 more Smart Citation

Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Dayrat

Conrad

Balayan

et al. 2011

Molecular Phylogenetics and Evolution

143

182

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“…Some studies have dealt with opisthobranch phylogeny in general (Gosliner 1981;Schmekel 1985;Salvini-Plawen 1990Salvini-Plawen and Steiner 1996;Dayrat and Tillier 2002;Mikkelsen 2002;Wägele and Klussmann-Kolb 2005) (Fig. 2b-d); however, without recovering completely congruent and convincing topologies.…”

Section: Classification and Phylogenetic Concepts Of Opisthobranchia mentioning

confidence: 99%

“…He based his ideas about molluscan systematics on anatomical information taken from Lacaze-Duthiers (1870, after Dayrat and Tillier 2002) and his own examinations of nervous systems. Von Ihering united Opisthobranchia (including the Rhodopidae, a taxon he described in 1876) and Pulmonata within his new taxon Ichnopoda, which comprised many heterobranchs.…”

Section: Late Nineteenth Centurymentioning

confidence: 99%

Flashback and foreshadowing—a review of the taxon Opisthobranchia

et al. 2013

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Opisthobranchia have experienced an unsettled taxonomic history. At the moment their taxonomy is in state of dramatic flux as recent phylogenetic studies have revealed traditional Opisthobranchia to be paraphyletic or even polyphyletic, allocating some traditional opisthobranch taxa to other groups of Heterobranchia, e.g. Pulmonata. Here we review the history of Opisthobranchia and their subgroups, explain their traditionally proposed relationships, and outline the most recent phylogenetic analyses based on various methods (morphology, single gene and multiple gene analyses, as well as genomic data). We also present a phylogenetic hypothesis on Heterobranchia that, according to the latest results, represents a consensus and is the most probable one available to date. The proposed phylogeny supports the Acteonoidea outside of monophyletic Euthyneura, the basal euthyneuran split into Nudipleura (Nudibranchia plus Pleurobranchoidea) and the recently established taxon Tectipleura. The latter divides into the Euopisthobranchia, containing most of the major traditional opisthobranch clades, and the Panpulmonata, with a mix of the former opisthobranch, putative allogastropod and pulmonate taxa. This "new euthyneuran tree" rejects the traditional taxa Opisthobranchia and Pulmonata, and, in particular, has profound implications for preconceived textbook scenarios of opisthobranch and pulmonate evolution, which must now be reconsidered. In the absence of systematic barriers, research communities-which have traditionally investigated marine and non-marine heterobranchs separately-need to interact and finally merge for the sake of science.

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Really a “secondary gill under the skin”? Unveiling “dorsal vessels” in freshwater slugs (Mollusca, Panpulmonata, Acochlidimorpha)

Neusser,

Brenzinger,

Schrödl

et al. 2023

Journal of Morphology

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The freshwater slugs of the genus Acochlidium (Heterobranchia, Gastropoda, and Acochlidimorpha) are peculiar, one to two centimeter sized animals found only in small coastal rivers and streams of Southeast Asian and Western Pacific islands. When first described by Bücking, the author observed a branching “net of dendritic vessels connected to the heart,” which he assumed to have replaced the original gastropod gill. In the present study, we compare the renopericardial systems of four Acochlidium species in microanatomical, histological and ultrastructural detail and identify where exactly the enigmatic, subepidermal “dorsal vessels” connect to the renopericardial system to examine if they can really function as a gill. Acochlidium have elaborate renopericardial systems compared to their ancestrally marine and also freshwater relatives. The primary site of ultrafiltration is the epicardium of the atrium with podocytes as usual for gastropods. The “dorsal vessels” in Acochlidium are extensions of the outer epithelium of the pericardial cavity and represent true vessels, that is, coelomatic channels, having an endothelium with podocytes. Hence, they considerably enlarge the site of ultrafiltration increasing the pericardial surface. “Dorsal vessels” in Acochlidium are therefore not homologous to externally similar morphological structures in Sacoglossa (marine panpulmonate slugs and snails). The multiplication of renopericardioducts in Acochlidium is a unique feature within Mollusca that enhances the negative pressure necessary for ultrafiltration in the thin, tube‐like dorsal vessels and as a consequence the transport of primary urine from the pericardium to the kidney. The circulatory and excretory systems in Acochlidium are adaptations to a lifestyle in their freshwater environment in which snail bodies are hyposmotic and accrue considerable influx of surplus water into the body, which needs to be expelled.

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Evolutionary relationships of euthyneuran gastropods (Mollusca): a cladistic re-evaluation of morphological characters

Cited by 93 publications

References 196 publications

Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Flashback and foreshadowing—a review of the taxon Opisthobranchia

Really a “secondary gill under the skin”? Unveiling “dorsal vessels” in freshwater slugs (Mollusca, Panpulmonata, Acochlidimorpha)

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