SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Winter, A.J. de.

Costigulella primennilus spec. nov. is the first representative of Costigulella reported from Cameroon. It is probably the smallest species of the family Streptaxidae known world-wide. Arguments are provided to consider Costigulella an independent radiation and genus, rather than a subgenus of Gulella. The mode of development of apertural barriers in juvenile shells in Costigulella and in other Streptaxidae is discussed.

Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malaŵi 10. Description of Gulella systemanaturae, a new species from Dedza Mountain

Palavras-chave: Mollusca; Gastropoda; Gulella; Costigulella; New status; New species; Distribution; Africa; Cameroon; Shell development; Apertural barriers; 42.73.

Ano: 2008

URL: http://www.repository.naturalis.nl/record/261785

Gulella systemanaturae spec. nov. is described from Dedza Mt. in South-Central Malaŵi. The mediumsized shell is characterized by little prominent costulation and a four-fold apertural dentition consisting of angular lamella, labral process, and outer and inner columellar processes. The labrum is sharply angulate at its point of attachment to the body whorl near the angular lamella.

Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malawi 12 Four new species of Gulella s.l.

Palavras-chave: Gastropoda; Pulmonata; Streptaxidae; Gulella; Taxonomy; Malaŵi; 42.73.

Ano: 2008

URL: http://www.repository.naturalis.nl/record/261759

Gulella annibiodiversitatis spec. nov. is described from a few scattered localities in montane forest above c. 1300 m in southern-central Malaŵi. It is mainly characterized by a smallish (4.9-6.3 mm high), smooth and generally featureless shell without apertural dentition. Gulella menkhorsti spec. nov., has a small (2.3-2.9 mm high) and smooth shell with a six-fold dentition and is probably a restricted range endemic; so far it has only been recorded from the Mpita Forest in southern Malaŵi. A single smooth and small shell (2.7 mm) with a seven-fold apertural dentition from the Misuku Hills in northern Malaŵi also does represent a new species, Gulella crux spec. nov. Another sample from the same area, introduced as Gulella nuchalis spec. nov., has a...

Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malaw^ i 5. Description of Gulella meredithae spec. nov.

Palavras-chave: Gastropoda; Pulmonata; Streptaxidae; Gulella; Malawi; East Africa; Taxonomy.

Ano: 2011

URL: http://www.repository.naturalis.nl/record/638094

Gulella meredithae spec. nov. is described from the uplands of central and northern Malawi. It belongs to what has been termed the G. browni-group (better called the G. radius-group), an assemblage of Central and East African taxa with small shells with a noticeably acute apex, with more or less smooth nepionic whorls and with marked costulation on the remaining whorls. Attention is drawn to the striking juvenile apertural dentition.

Description of four new species of Gulella Pfeiffer, 1856 from Eastern Cape, South Africa, with additional notes on two poorly known species (Mollusca: Eupulmonata: Streptaxidae)

Palavras-chave: Gastropoda; Pulmonata; Streptaxidae; Gulella; Africa; Malawi; Juvenile dentition; Taxonomy; 42.73.

Ano: 2000

URL: http://www.repository.naturalis.nl/record/216030

Cole, M.L.; Herbert, D.G..

Gulella bruggeni spec. nov., G. bomvana spec. nov., G. tietzae spec. nov. and G. ndibo spec. nov. are described from the Transkei region of Eastern Cape Province, South Africa. All are minute, smooth-shelled species with complex apertural dentition. Due to their limited ranges and continuing decline in extent and quality of habitat, G. bruggeni spec. nov., G. bomvana spec. nov. and G. ndibo spec. nov. are likely to meet the distribution-based criteria for red-listing as Critically Endangered and G. tietzae spec. nov. as Endangered. G. aprosdoketa and G. chi are discussed and illustrated for comparison and the known distribution of each is extended.

Gulella adami, a new species of land snail from the Ivory Coast, West Africa (Gastropoda Pulmonata: Streptaxidae)

Palavras-chave: Mollusca; Gastropoda; Streptaxidae; Gulella; Taxonomy; New species; Range extensions; Conservation; Eastern Cape; South Africa; 42.73.

Ano: 2009

URL: http://www.repository.naturalis.nl/record/311932

Gulella adami spec. nov. is described from a classical West African locality, Assini in the Ivory Coast (Côte d'Ivoire). It is most unusual in showing two superficial parietal processes, which may also be interpreted as a double angular lamella, in the aperture of the shell. The shell closely resembles that of various Enidae in SE Europe and adjoining areas around the Mediterranean, thereby providing a striking example of convergent evolution.

Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malawi9. Description of Gulella streptostelopsis, a new Streptostele-like species of Gulella.

Palavras-chave: Gastropoda; Pulmonata; Streptaxidae; Gulella; New species; Enidae; Convergent evolution; Ivory Coast; West Africa; 42.73.

Ano: 1994

URL: http://www.repository.naturalis.nl/record/318885

Gulella streptostelopsis spec. nov. is described from a series of localities of mainly between 1000 and 1500 m a.s.l. in Malawi south of about 11°S. The minute, almost smooth, shell (length 2.0-2.4 mm) resembles that of the genus Streptostele (hence the name), but is characterized by three-fold apertural dentition and just under six whorls. This taxon may represent a new genus; pending studies on the anatomy no new generic name is proposed.