Delouagapia
| Delouagapia | |
|---|---|
| Delouagapia tasmani | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Superfamily: | Rhytidoidea |
| Family: | Rhytididae |
| Subfamily: | Rhytidinae |
| Genus: | Delouagapia Powell, 1952 |
| Type species | |
| Delouagapia cordelia | |
Delouagapia is a genus of land snails belonging to the family Rhytididae.[1] Both members of the genus are endemic to New Zealand, with D. cordelia found in forested areas of Northland, and D. tasmani in Manawatāwhi / Three Kings Islands.
Description
In the original description, Powell described the genus as below:
The dental formula for both the New Zealand Delos coresia and jeffreysiana is 9+0+9 and that of cordelia 12+0+12. The teeth in all three are stout, relatively broad-based and slightly hooked. In Delos typical, the second tooth from the centre is largest, after which they regularly diminish. In Delouagapia the fourth tooth from the centre is disproportionately large, then regularly diminishing from the fifth to the twelfth. The animal of cordelia is slate-grey except for the sole, which is white. Surface reticulate veined, scarcely warty. Two deep parallel grooves on the dorsal area run back from between the superior tentacles, which are blunt, cylindrical and moderately long. Inferior tentacles short, genital orifice on right below mantle collar, proboscis capable of protrusion, foot narrow, transversely wrinkled and with a moderately long pointed tail.[2]
The genus can be differentiated from Delos due to having more radular teeth per row, and by the members' distinctive colour patterns.[3] Climo noted that the genus differed from Delos due to being more tightly coiled, by having a greenish background colouration to the shells of the animals, and the presence of brown blotches or zig-zags on the shells.[4]
Taxonomy
The genus was first described by A. W. B. Powell in 1952, as a subgenus of Delos, and naming Gerontia cordelia (now known as Delouagapia cordelia) as the type species.[2] In 1959, Alan Solem synonymised the taxon with Delos;[5] and in 1977, Frank Climo restored Delouagapia, raising it to genus level.[4] The genus was monotypic until 1999, when D. tasmani was described.[6]
Distribution and habitat
The genus is endemic to New Zealand.[7][8] D. cordelia is known to occur in Northland,[2][9] and while it was first recorded as occurring in Titirangi in Auckland, no observations have been made since.[6] D. cordelia is arboreal, found in association with Astelia epiphytes growing on Vitex lucens.[2] D. tasmani is endemic to Oromaki / North East Island in Manawatāwhi / Three Kings Islands, found in Meryta sinclairii-dominated forest in leaf litter under stones.[6]
Species
Species within the genus Delouagapia include:[1]
- Delouagapia cordelia (F. W. Hutton, 1883)
- Delouagapia tasmani Goulstone & Brook, 1999
References
- ^ a b Delouagapia A. W. B. Powell, 1952. Retrieved through: World Register of Marine Species on 30 September 2025.
- ^ a b c d Powell, A. W. B. (1952). "Four New Species of New Zealand Land Snails and the systematic position of Gerontia cordelia Hutton". Records of the Auckland Institute and Museum. 4: 163–168. ISSN 0067-0464. JSTOR 42906060. Wikidata Q58676731.
- ^ Powell, A.W.B. (1979). New Zealand Mollusca: Marine, Land and Freshwater Shells. Auckland: Collins. p. 348. ISBN 0002169061.
- ^ a b Climo, F. M. (March 1977). "A new higher classification of New Zealand Rhytididae (Mollusca: Pulmonata)". Journal of the Royal Society of New Zealand. 7 (1): 59–65. doi:10.1080/03036758.1977.10419336. ISSN 0303-6758. Wikidata Q54555783.
- ^ Solem, Alan (1959). "Systematics and zoogeography of the land and freshwater molluscan fauna of the New Hebrides". Fieldiana: Zoology. 43: 4–359. doi:10.5962/bhl.title.2888.
- ^ a b c Goulstone, J. F.; Brook, F. J. (March 1999). "Description of five species of terrestrial molluscs (Gastropoda: Stylommatophora: Punctidae, Charopidae, Rhytididae) discovered in the Three Kings Islands, northern New Zealand". Journal of the Royal Society of New Zealand. 29 (1): 23–39. doi:10.1080/03014223.1999.9517581. ISSN 0303-6758. Wikidata Q54573981.
- ^ "Delouagapia". New Zealand Organisms Register. Retrieved 30 September 2025.
- ^ Spencer, H.G.; Marshall, B.A.; Willan, R.C. (2009). "Checklist of New Zealand living Mollusca". In Gordon, Dennis P. (ed.). New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Christchurch: Canterbury University Press. p. 218. ISBN 978-1-877257-72-8.
- ^ Roscoe, D. J. (October 1989). "Panbiogeography and the public". New Zealand Journal of Zoology. 16 (4): 757–761. doi:10.1080/03014223.1989.10422932. ISSN 0301-4223. Wikidata Q54555792.