Four nudibranch gastropods new to the fauna of Great Britain and Ireland including a description of a new species of Doto Oken (original) (raw)
Related papers
Journal of Molluscan …, 1996
The Dondacean Nudibranch Ceitodons reticulata Eliot, 1906 is redescnbed from specimens collected in the Cape Verde Islands. This species, characterized by the colour of its body, had not been collected since its original description at the beginning of this century. Seven species of Geitodons Bergh, 1891 are known from the East Atlantic and Mediterranean Sea. Of these, G. perfossa Ortea, 1990 from the Canary Islands, is the most closely related to G reticulata, but its general coloration, the gill, the tubercles of the mantle and some features of the internal anatomy are different from the latter. The authors believe that the presence of denticles on the radular teeth of the Geitodons species should be considered as a specific character rather than a generic one
Seven species of landsnails (Gastropoda) new to the Faroe Islands
Fróðskaparrit - Faroese Scientific Journal, 2015
Síðan kanningina, sum Solhøy framdi 1977-79 (Solhøy, 1981) er eingin skipað kanning gjørd innan útbreiðslu av landsniglum. Nógvur innflutningur av byggitilfari og urtagarðs tilhoyri hevur skapað karmar fyri innførslu av nýggjum sniglasløgum til oyggjarnar. Hendan greinin er grundað á innsavnað tilfar og eygleiðingar seinnu mongu árini frá heimildarfólki kring landi, sum hava vent saer til Jens-Kjeld Jensen. Úrslitið higartil er ein staðfesting av sjey sniglasløgum, afturat teimum 20 sum Solhøy hevur skráset í Føroyum. Umframt var eitt slag innført við vinnu fyri eyga, sum ikki tykist tola føroyska veðurlagið. Hvørjar avleiðingar búsetingin hjá nýggju sniglasløgunum hevur, er ilt at siga, eitt nú kunnu tey virka sum millumvertir fyri sníkar, sum eru endavertir hjá kettu og hundi.
Annotated List of the Non-Marine Mollusca of Britain and Ireland, 2020
2020
This has been revised in the light of comments received since its publication, notably a critique by Bank et al. (2007), members of the original Clecom team, which has appeared in the form of an alternative British list in the journal Heldia. Readers should note especially the following changes to species names: substitution of Oxyloma sarsii for Oxyloma sarsi (misspelling); substitution of Mytilopsis leucophaeata for Mytilopsis leucophaeta (misspelling); correction of Succinella oblonga Draparnaud to the correctly parenthesized Succinella oblonga (Draparnaud); substitution of Anisus spirorbis (Linnaeus), for the incorrect rendering Anisus spirorbis Linnaeus; and of Hydrobia acuta neglecta Muus for the incorrect Hydrobia acuta neglecta (Muus). Alterations to author names, family names and to dates in the original Clecom List as given by Bank et al. (2007) are also included here. I lack access to early literature quoted by these authors but have no hesitation in accepting the changes and updates given in their checklist. Revision of the present British list has also involved the correction of typographical errors, revision of authors' names to include initials in cases where these were omitted but where confusion with other authors of the same surname is possible, and the inclusion of all accepted subgenera where some of these were previously omitted. I have tried to adopt taxonomic ranking and names on the basis of DNA studies where these are available and/or appropriate to the taxa in question. The position taken by Anderson (2005) with regard to the taxonomic rank of Stagnicola is a case in point. Stagnicola was placed as a subgenus of Lymnaea on the basis of molecular evidence of ranking provided by Bargues et al. (2001). However, when segregates of the aggregate species Lymnaea palustris were introduced to the British list by Carr & Killeen (2003), a variant of this was employed i.e. Stagnicola was used as a genus name rather than as a subgenus name. This follows wider continental European practice. As part of a watching brief on this issue the recent publications of Bargues and associates have been studied. Essentially Bargues and collaborators have maintained the opinion that the European stagnicolines should be regarded as belonging to a subgenus of Lymnaea rather than as a self-standing genus (Bargues et al. 2003, Bargues & Mas-Coma. 2005). The position taken in Anderson (2005) therefore requires no change. However, the specific name for the commonest British stagnicoline, Lymnaea fusca is grammatically incorrect. A change to Lymnaea (Stagnicola) fuscus is made in the current list. The use of subspecies names has been debated and some changes are made in this area. Anderson (2005) included only two subspecies (Hydrobia acuta neglecta and Oxychilus navarricus helveticus) within the original list but Bank et al. (2007) make a case for reconsidering a number of other instances in which well characterised subspecies are known in continental Europe. For instance, the work of Schütt (1986) has demonstrated that Theodoxus fluviatilis is polytypic within its range and form found in Britain and Ireland is accordingly now called Theodoxus fluviatilis fluviatilis. The same is true for Discus rotundatus, now called Discus rotundatus rotundatus, and for Balea biplicata, Clausilia bidentata, Arianta arbustorum, Cepaea nemoralis, Helicigona lapicida, Theba pisana, Helicodonta obvoluta and Planorbarius corneus, all nominotypical forms. With the recognition of subspecies designations comes the problem of which to recognise if there is more than one in our geographical area. Difficulty arises, for instance, with Trochulus striolatus abludens and Clausilia dubia suttoni. Trochulus striolatus abludens is said to be restricted to northwest Europe including the British Isles. However, it is unclear whether the invasive and highly variable populations now found across the British Isles can be unambiguously distinguished from forms found elsewhere in Europe. Until the matter is resolved the default position of ignoring the subspecies designation is adopted. The case of Clausilia dubia is much more clear cut. There is good evidence for a relict form (suttoni Westerlund 1881) found in northern England being distinct morphologically from the nominotypical subspecies dubia Draparnaud 1805 found as an immigrant at Dover (Dean 1914). Both subspecies are therefore recognized. Please note that the recommended ICZN format for subspecies has now been adopted i.e. a trinomial with author for the subspecies name only. If the subspecies in our area is not nominotypical then there may be a difficulty as details of the author are omitted from the species name. This appears in only one or two cases, however.
Late Famennian gastropoda from south-west England
Palaeontology, 2003
The gastropod fauna of the Upper Devonian Baggy and Pilton formations in southwest England is revised and includes some 30 taxa. The topmost part of the Upper Famennian succession in Devon is represented by clastic near-shore and shallow shelf sediments, indicating a short-term transgressive phase (`Strunian Transgression'). The sequence yields a highly diverse fauna dominated by brachiopods and ostracodes, locally supplemented by crinoids, bryozoans, trilobites and molluscs. The taxa`Patellostium' britannicum sp. nov., Angyomphalus (Angyomphalus) junius sp. nov. and Dictyotomaria eurocapillaria sp. nov. are erected; a junior homonym is replaced by Macrochilina? piltonensis nom. nov. The gastropod fauna displays an independent character, where latest Devonian faunal elements overlap with Late Palaeozoic taxa expressing a transition similar to that of the bivalves, brachiopods, echinoderms and corals, without a sharp faunal break at the Devonian/Carboniferous boundary. Apart from the Caenogastropoda, all subclasses of gastropods are represented. Members of the bellerophontoids, pleurotomarioids and loxonematoids are most abundant, followed by murchisonioids, naticimorphs, euomphalomorphs and platyceratoids. The various gastropod groups represent different ecological demands and trophic categories, and together with the accompanying fauna indicate that nearly all habitats and niches were occupied in the shallow South Laurussian Shelf.
This work explores the second report of the alien nudibranch Godiva quadricolor (Barnard, 1927) (Gastropoda Nudibranchia Facelinidae) in eastern Sicily (Italy). Previously, this species has been found only in the area of Faro Lake (Messina), where now there is a significant population. The specimen here reported was sighted while diving in Santa Maria La Scala (Acireale, Catania) near a fresh water source. In fact, as it has been claimed by other authors, there is a strong correlation between this species and the brackish water areas. This work argues that this specimen has been brought to this area either by the Strait of Messina currents or by fishing boats, which dock at a small port in the study area. Since this is a species which easily adapts to different environmental conditions and feeds on other nudibranchs, G. quadricolor propagation could be a great threat to indigenous biodiversity.
Helgoland Marine Research, 2015
In recent years, several morphological and molecular analyses have been undertaken to study the phylogenetic systematics of Aeolidiidae members. The monospecific genus Burnaia could not be included in the previous analysis, due to the lack of material. This study includes two specimens of Burnaia helicochorda from Australia and places them in their systematic position using two mitochondrial and one nuclear genes (COI and 16S, and H3, respectively). A description of its anatomy is also included with colour pictures of the animal and scanning electron micrographs of radula and jaws. Based on our results, B. helicochorda does not belong to Aeolidiidae since it appears nested among some facelinids.