A new genus of semislugs (Stylommatophora: Euconulidae) from Costa Rica and a review of the genus Velifera (Stylommatophora: Euconulidae)
Fuente:
Redalyc
Enregistré dans:
| Auteur principal: | |
|---|---|
| Format: | Artículo científico |
| Langue: | en |
| Publié: |
Universidad de Costa Rica
2019
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1876441746102026240 |
|---|---|
| author | Zaidett Barrientos |
| author_facet | Zaidett Barrientos |
| contents | A new genus of semislugs (Stylommatophora: Euconulidae) from Costa Rica and a review of the genus Velifera (Stylommatophora: Euconulidae) Zaidett Barrientos Biología semislug endemism land snail Euconulinae snail anatomy The family Euconulidae is circumglobal, but only one subfamily, the Euconulinae, occurs in the American continent. Fourteen native euconulids, in three genera, have been reported from Costa Rica. Objective_ In this paper I describe Tikoconus, a new genus of Euconulinae endemic to Costa Rica. Methods_ I dissected alcohol-preserved euconulids collected in Costa Rica. I took photographs or electron micrographs or drew the shell, external anatomy, reproductive system, mantle cavity organs and radula. Results_ The genus Tikoconus can be recognized by its semislug appearance and very thin and often flexible subglobose to subglobose-depressed external shell. Other distinctive features of the genus are a lack of black dots on the mantle and the presence of at least some dark blotches on the subpedal groove band. Internally, the urethra has a Z-shaped prolongation that almost reaches the mantle collar. The reproductive system has a distinctive external C-shaped penial gland that surrounds half of the penis circumference and is attached to the penis and to the penial caecum, but not connected to them by ducts. Also, there is an internal mono- or bi-lobulated extension in the penis. The epiphallus has a verge that enters into the penis. The penial sheath surrounds part of the penis, the epiphallus base and the penial retractor muscle insertion, but leaves the penial gland and the penis caecum free. The gametolytic gland is absent. I described two new subgenera_ Tikoconus sensu stricto with seven new species-T. (T.) costaricanus sp.n. (type species), T. (T.) onca sp.n., T. (T.) andresi sp.n., T. (T.) katyae sp.n., T. (T.) alosii sp.n., T. (T.) subsilvanus sp.n_ 2019 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44965908017 https://www.redalyc.org/journal/449/44965908017/ https://www.redalyc.org/journal/449/44965908017/html/ https://www.redalyc.org/journal/449/44965908017/44965908017.epub https://www.redalyc.org/journal/449/44965908017/movil DOI 10.15517/RBT.V67I6.36105 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.6 Vol.67 |
| format | Artículo científico |
| id | redalyc_44965908017 |
| institution | Redalyc |
| language | en |
| publishDate | 2019 |
| publisher | Universidad de Costa Rica |
| spellingShingle | A new genus of semislugs (Stylommatophora: Euconulidae) from Costa Rica and a review of the genus Velifera (Stylommatophora: Euconulidae) Zaidett Barrientos Biología semislug endemism land snail Euconulinae snail anatomy A new genus of semislugs (Stylommatophora: Euconulidae) from Costa Rica and a review of the genus Velifera (Stylommatophora: Euconulidae) Zaidett Barrientos Biología semislug endemism land snail Euconulinae snail anatomy The family Euconulidae is circumglobal, but only one subfamily, the Euconulinae, occurs in the American continent. Fourteen native euconulids, in three genera, have been reported from Costa Rica. Objective_ In this paper I describe Tikoconus, a new genus of Euconulinae endemic to Costa Rica. Methods_ I dissected alcohol-preserved euconulids collected in Costa Rica. I took photographs or electron micrographs or drew the shell, external anatomy, reproductive system, mantle cavity organs and radula. Results_ The genus Tikoconus can be recognized by its semislug appearance and very thin and often flexible subglobose to subglobose-depressed external shell. Other distinctive features of the genus are a lack of black dots on the mantle and the presence of at least some dark blotches on the subpedal groove band. Internally, the urethra has a Z-shaped prolongation that almost reaches the mantle collar. The reproductive system has a distinctive external C-shaped penial gland that surrounds half of the penis circumference and is attached to the penis and to the penial caecum, but not connected to them by ducts. Also, there is an internal mono- or bi-lobulated extension in the penis. The epiphallus has a verge that enters into the penis. The penial sheath surrounds part of the penis, the epiphallus base and the penial retractor muscle insertion, but leaves the penial gland and the penis caecum free. The gametolytic gland is absent. I described two new subgenera_ Tikoconus sensu stricto with seven new species-T. (T.) costaricanus sp.n. (type species), T. (T.) onca sp.n., T. (T.) andresi sp.n., T. (T.) katyae sp.n., T. (T.) alosii sp.n., T. (T.) subsilvanus sp.n_ 2019 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44965908017 https://www.redalyc.org/journal/449/44965908017/ https://www.redalyc.org/journal/449/44965908017/html/ https://www.redalyc.org/journal/449/44965908017/44965908017.epub https://www.redalyc.org/journal/449/44965908017/movil DOI 10.15517/RBT.V67I6.36105 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.6 Vol.67 |
| title | A new genus of semislugs (Stylommatophora: Euconulidae) from Costa Rica and a review of the genus Velifera (Stylommatophora: Euconulidae) |
| topic | Biología semislug endemism land snail Euconulinae snail anatomy |
| url | https://www.redalyc.org/articulo.oa?id=44965908017 https://www.redalyc.org/journal/449/44965908017/ https://www.redalyc.org/journal/449/44965908017/html/ https://www.redalyc.org/journal/449/44965908017/44965908017.epub https://www.redalyc.org/journal/449/44965908017/movil |