Tag Archive for: biodiversity

The Cochlostomatidae of Northern Africa (Gastropoda, Caenogastropoda)

Authors: Intidhar Abbès, Issaad Kawther Ezzine, Eike Neubert
Basteria, 88 (1) 54 - 67Published:

Abstract

A comprehensive survey on the Cochlostomatidae from Northern Africa is given, based on a critical examination of the type specimens of the described nominal taxa. As a result, five species are accepted to occur in Northern Africa: Cochlostoma letourneuxi(Bourguignat, 1866) from Tunisia and Algeria, C. atlanticum (Bourguignat, 1868) from Algeria, C. barcaense Brandt, 1958 and C. susaense Brandt, 1958 from Libya and Obscurella marocanum (Pallary, 1928) from Morocco. New records of C. letourneuxi for Tunisia are provided. The shell of each species is described and illustrated, synonyms are listed, and a distribution map is provided. A lectotype is selected for Pomatias letourneuxi; Pomatias tunetanus is selected as type species for Tunetana A. J. Wagner, 1897.

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New northern Atlantic species of the family Fissurellidae (Gastropoda, Vetigastropoda)

Authors: Leon Hoffman, Bart van Heugten, Jeroen Goud
Basteria, 87 (2): 150-155Published:

Abstract

Four species of the family Fissurellidae were identified from two deep bathyal samples from the Cape Verde Islands and on the Mid-Atlantic Ridge. Cornisepta magna spec. nov. Is described from off Sao Nicolau, Cape Verde islands. Cornisepta microphyma, Profundisepta bipolar spec. nov. and an undescribed species of the genus Fissurisepta were found on the Mid Atlantic Ridge.

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Download articleArtikel New northern Atlantic species of the family Fissurellidae (Gastropoda, Vetigastropoda)

Hidden diversity in cockles: six new Indo-Pacific species and a new subfamily with notes on the Vasticardium elongatum species group (Bivalvia: Cardiidae)

Author: Jan Johan ter Poorten
Basteria, 87 (2): 169-205Published:

Abstract

Six new Indo-Pacific Cardiidae species are described originating from various institutional collections, supplemented with material from private collections, mostly based on shell characters and partly augmented by genetic information: Microcardium lukasi spec. nov., Microcardium roelofi spec. nov., Ctenocardia lisae spec. nov., Acrosterigma zamboangaense spec. nov., Vasticardium jorgeni spec. nov. and Vasticardium albopacificum spec. nov. A new subfamily Nemocardiinae subfam. nov. is proposed for the genera Nemocardium Meek, 1876; Pratulum Iredale, 1924; Keenaea Habe, 1951; Lophocardium P. Fischer, 1887; Frigidocardium Habe, 1951 and Microcardium Keen, 1937. In addition it comprises the extinct genera Anechinocardium Hickman, 2015 and Arctopratulum Keen, 1954. Some notes are given on the composition and geographic distribution of the Vasticardium elongatum group of species. Acrosterigma elongatum cipangense J. Vidal, 1993 is considered a junior synonym of Trachycardium (Acrosterigma) serricostatum okinawaense Kuroda, 1960 and Vasticardium kuboderai Thach, 2015 a junior synonym of Vasticardium berschaueri Thach, 2014.

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Download articleArtikel Hidden diversity in cockles: six new Indo-Pacific species and a new subfamily with notes on the <em>Vasticardium</em> <em>elongatum</em> species group (Bivalvia: Cardiidae)

Species in Fissurellidae (Gastropoda) from the North Atlantic with a focus on the Azorean seamounts

Authors: Leon Hoffman, André Freiwald
Basteria, 87 (1): 77-96Published:

Abstract

Various reviews of families in Mollusca have indicated a large diversity and a high degree of endemicity on the Azorean seamounts. In this study, bathyal species in the gastropod family Fissurellidae have been investigated using material collected during the M151 cruise conducted by R/V Meteor in 2018 to seamounts south of the Azores. Additional records were incorporated from literature including a review of some species in the subfamily Fissurellinae from the cruise SEAMOUNT 2 in 1997 and from northern Atlantic species in the collection at Senckenberg am Meer (Wilhelmshaven). Fourteen species are herein reported from the Azorean seamounts of which twelve species were found during M151; Puncturella asturiana (P. Fischer, 1883) and Profundisepta alicei (Dautzenberg & H. Fischer, 1897) were not recorded in this cruise. The distributions of the poorly-known, yet common, Puncturella fornicata Locard, 1898 and Puncturella agger R. B. Watson, 1883 are presented. Profundisepta luciae spec. nov. is proposed; this species is the only fissurellid endemic to the Azorean seamounts. The degree of endemism in Fissurellidae is much lower (7%) on the Azorean seamounts than in other recently reviewed species in Veti- and Caenogastropoda (40-100%). Nearly 50 % of the fissurellids have an amphi-Atlantic distribution. It is unclear how most species have distributed over large areas considering their direct or short lecitotrophic larval development. Their relatively large foot to body mass ratio possibly facilitated planktonic rafting and may have enabled long-distance migrations.

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Rhytidoid land snails collected in 2007 at 21 sites in northern Madagascar, with descriptions of 13 new species and two new subspecies (Gastropoda, Rhytidoidea: Acavidae and Clavatoridae)

Authors: Kenneth C. Emberton, Judicaël A. Rakotondrazafy
Basteria, 84 (4/6): 170-209Published:

Abstract

Collections in 2007 of 634 stations at 21 sites in northern Madagascar yielded 35 species and subspecies of rhytidoid land snails: Ampelita akoratsara akoratsara Emberton, 1999, A. akoratsara paulayi subspec. nov., A. analamerae Ember­ton, 1999, A. andavakoerae spec. nov., A. anjajaviensis spec. nov., A. atropos (Deshayes, 1850), A. capdambrae spec. nov., A. celestinae spec. nov., A. clotho (Deshayes, 1850), A. con­sanguinea (Deshayes, 1850), A. ela spec. nov., A. gaudens (Mabille, 1884), A. granulosa (Deshayes, 1850), A. kendrae spec. nov., A. kirae spec. nov., A. lachesis (Deshayes, 1850), A. lamarei lamarei (L. Pfeiffer, 1846), A. lamarei sakalava (Angas, 1878), A. lincolni spec. nov., A. masoalae Ember­ton, 1999, A. michellae spec. nov., A. miovaova spec. nov., A. niarae spec. nov., A. stilpna (Mabille, 1884), A. thompsoni spec. nov., Eurystyla ambatoensis (Emberton & Griffiths, 2009), E. julii julii (Fischer-Piette & Garreau, 1965), E. julii kely subspec. nov., E. julii soa (Emberton & Griffith, 2009), Paraclavator moreleti (Deshayes, 1851), Embertoniphanta amphibulima (L. Pfeiffer, 1847), E. echinophora (Deshayes, 1850), E. oviformis (Grateloup, 1840), E. josephinae spec. nov., and E. socii (Fischer-Piette, F. Blanc & Salvat, 1975).

Live adults of 17, and tissue samples of 22, of these 35 taxa were collected. The new species bring Madagascar’s total described rhytidoid species to 135. More await discovery, both within Madagascar’s forests and within extensive, unidentified collections from 1995-1996.

Discoveries include: (a) the hairy-shelled Embertoniph­anta echinophora has a broad rainforest distribution and has an isolated, deciduous-forest, sister species, E. joseph­inae spec. nov.; (b) the gigantic (shell height 91.7 mm), micro-endemic Embertoniphanta socii is effectively absent from northern Ankarana; (c) the Eurystyla radiation is much more extensive than previously imagined; (d) south­ern Namoroka Reserve is not the home of its namesake Ampelita namerokoensis Fischer-Piette, 1952 (described from Bemaraha, far to the south!), but of A. thompsoni spec. nov.; (e) A. miovaova spec. nov., as proposed, is one of the most conchologically variable species of land snails; (f) A. lincolni spec. nov. is now the largest known Ampelita (73.5 mm diameter).

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Download articleArtikel Rhytidoid land snails collected in 2007 at 21 sites in northern Madagascar, with descriptions of 13 new species and two new subspecies (Gastropoda, Rhytidoidea: Acavidae and Clavatoridae)