Asperdaphne balcombensis
| Asperdaphne balcombensis | |
|---|---|
| Shell of Asperdaphne balcombensis (holotype) | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Superfamily: | Conoidea |
| Family: | Raphitomidae |
| Genus: | Asperdaphne |
| Species: | †A. balcombensis
|
| Binomial name | |
| †Asperdaphne balcombensis A. W. B. Powell, 1944
| |
| Synonyms[1] | |
|
†Pleurotomella balcombensis (A. W. B. Powell, 1944) superseded combination | |
Asperdaphne balcombensis is an extinct species of sea snail, a marine gastropod mollusk in the family Raphitomidae.[1]
Description
The length of the shell attains 11 mm, its diameter 4.25 mm.
(Original description) The fusiform shell is characterized by convex whorls, an excavated base, and a moderately long, flexed, and recurved anterior siphonal canal. Its most distinctive feature is the sculpture of numerous sharply raised, rounded axial ribs crossed by crisp primary and secondary spiral cords.
The protoconch consists of 2 1/2 rounded whorls that are finely striated. The apex is small and inrolled. The body whorl bears a few weak, irregular axial riblets and is terminated by a thin, sinuous rim. The whorls of the teleoconch are convex with a slight shoulder, located at approximately four-fifths of the whorl height. The anterior canal of the aperture is moderately long, flexed, and recurved.
The sculpture of the shoulder area contains 5 to 6 fine spiral lirations (thread-like cords) crossed by arcuate threads that follow the curve of the sinus. The axial sculpture consists of Numerous, sharply raised ribs and rounded axial ribs are present. They originate at the shoulder angle and run over the base, extending to the anterior end (but not onto the anterior canal). There are 20 axial ribs per whorl. The axial ribs are crossed by crisp, narrow primary spiral cords. The penultimate whorl bears 6 primary cords, with a finer secondary thread in each interspace. The body whorl bears approximately 16 primary cords. The siphonal canal bears 6 strong spiral cords, but no axial sculpture. The outer lip is thin. The sutural sinus (originating at the suture) is typical for the genus and is a reversed "T-shaped" but is not deep.[2]
Distribution
Fossils of this extinct marine species were found in Middle Miocene strata in Victoria, Australia.
References
- ^ a b Asperdaphne balcombensisA. W. B. Powell, 1944. 9 December 2025. Retrieved through: World Register of Marine Species.
- ^ Powell, A.W.B. (1944). "The Australian Tertiary Mollusca of the family Turridae". Records of the Auckland Institute and Museum. 3: 59. Retrieved 9 December 2025. This article incorporates text from this source, which is under a CC BY 4.0 license.
- Darragh, T. A. (2024). A checklist of Australian marine Cenozoic Mollusca. Memoirs of Museum Victoria. 83: 37-206.
External links
- Darragh, T.A. (1970). "Catalogue of Australian Tertiary Mollusca (except Chitons)". Memoirs of the National Museum of Victoria. 31: 125–212.