Alvania denseclathrata Amati & Giulio & Oliverio 2023, n. comb.
- 1. Largo Giuseppe Veratti, 37 / D, I- 00146 Roma (Italy) bruno _ amati @ yahoo. it
- 2. Dipartimento di Scienze, LIME Lab, Università " Roma Tre ", Viale Marconi, 446, I- 00146 Roma (Italy) and NBFC, National Biodiversity Future Center, Palermo I- 90133 (Italy) andrea. digiulio @ uniroma 3. it
- 3. Dipartimento di Biologia e Biotecnologie ' Charles Darwin', Sapienza Università di Roma, Viale dell'Università 32, I- 00185 Roma (Italy) marco. oliverio @ uniroma 1. it
Description
Alvania denseclathrata (Thiele, 1925) n. comb.
(Figs 2; 48)
Rissoa denseclathrata Thiele, 1925: 81, pl. 6, fig. 11.
TYPE MATERIAL. — Lectotype. South Africa • dd; Valdivia Stn 95; 34°51’0”S, 19°37’47”E; 80 m; ZMB/Ma.64984 (here designated). Paralectotypes. South Africa • 4 dd; Valdivia Stn 95; 34°51’0”S, 19°37’47”E; 80 m; ZMB/Ma.64984 • 3 dd; Valdivia Stn 104; 35°15’57”S, 22°26’42”E; 155 m; ZMB/Ma.64984.
Angola • 2 dd; Valdivia Stn 81; 16°26’27”S, 11°41’27”E; ZMB/ Ma.64984.
TYPE LOCALITY. — South Africa, Valdivia Stn 95; 34°51’0”S, 19°37’47”E; 80 m.
DISTRIBUTION. — Only known from southern Africa (Valdivia Stns 95 and 104) and from a station in southern Angola (Valdivia Stn 81) (Fig. 48).
DIAGNOSIS. — Alvania with small (height c. 2 mm), robust shell, ovate-conical; convex whorls with weakly impressed suture; axial and spiral double sculpture dense, of equal thickness; aperture piriform, peristome continuous and simple, outer lip with robust varix; umbilical fissure absent. Protoconch paucispiral, dome-shaped, with spiral sculpture. Colouration uniform whitish.
REMARKS
The lot from southern Angola (Valdivia Stn 81) comes form a completely distinct biogeographic area, and we are not sure it is not a case of mislabelling. In any case, to stabilize the type locality we have designated as lectotype a specimen from the Cape area (Valdivia St. 95). Rissoa denseclathrata is currently included (Ponder 1985) in Haurakia Iredale, 1915. However, this is clearly a member of Alvania, with its shell devoid of umbilical fissure, with double sculpture (axial and spiral), piriform aperture, continuous and simple peristome, outer lip with robust varix, dome-shaped paucispiral protoconch with spiral sculpture. Alvania valeriae Absãlao, 1993 from off southeastern Espirito Santo State (southeastern Brazil) 38 m depth (Absãlao 1993: 104, 105, figs 1-3; Oliveira et al. 2018: 95, fig. 4 I-K), differs from Alvania denseclathrata n. comb. in its protoconch (quite evidently paucispiral and not multispiral as originally described) without sculpture vs sculptured with spiral cordlets in A. denseclathrata n. comb.; in the narrow umbilical fissure, absent in A. denseclathrata n. comb.; in the absence of a labial varix vs a robust labial varix in A. denseclathrata n. comb.
Alvania flexilis Gofas, 1999 from off Ilha de Luanda (Angola) 40-60 m (Gofas, 1999: 85, figs 27-32), differs from A. denseclathrata (Thiele, 1925) n. comb., in its multispiral protoconch sculptured with granules vs paucispiral with spiral sculpture in A. denseclathrata n. comb.; in the axial and spiral sulpture on the teleoconch more spaced than in A. denseclathrata n. comb.
We accordingly propose Alvania denseclathrata (Thiele, 1925) n. comb. as a new combination for Rissoa denseclathrata Thiele, 1925.
Notes
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Linked records
Additional details
Identifiers
Related works
- Is part of
- Journal article: 10.5252/zoosystema2023v45a25 (DOI)
- Journal article: http://publication.plazi.org/id/FFDAFF890B69750DFFB24B64EC17FF88 (URL)
- Journal article: http://zoobank.org/054D312B-C54B-459D-8A47-AC9CB681D7D4 (URL)
- Is source of
- https://sibils.text-analytics.ch/search/collections/plazi/03E387F10B6C750BFCDC4F50EFFAF9C5 (URL)
Biodiversity
- Collection code
- ZMB
- Family
- Rissoidae
- Genus
- Alvania
- Kingdom
- Animalia
- Material sample ID
- ZMB/ Ma.64984 , ZMB/Ma.64984
- Order
- Littorinimorpha
- Phylum
- Mollusca
- Scientific name authorship
- Amati & Giulio & Oliverio
- Species
- denseclathrata
- Taxonomic status
- comb. nov.
- Taxon rank
- species
- Type status
- lectotype , paralectotype
- Taxonomic concept label
- Alvania denseclathrata (Thiele, 1925) sec. Amati, Giulio & Oliverio, 2023
References
- THIELE J. 1925. - Gastropoden der Deutschen Tiefsee-Expedition. II Teil. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer " Valdivia " 1898 - 1899 17 (2): 35 - 382, pls 13 - 46 [reprints paginated 1 - 348, pls 1 - 34].
- PONDER W. F. 1985. - A review of the genera of the Rissoidae (Mollusca: Mesogastropoda: Rissoacea). Records of the Australian Museum, Supplement 4: 1 - 221. https: // doi. org / 10.385 3 / j. 0812 - 7387.4.1985.100
- IREDALE T. 1915. - A commentary on Suter's Manual of the New Zealand Mollusca. Transactions and Proceedings of the New Zealand Institute 47: 417 - 497. https: // www. biodiversitylibrary. org / page / 3343255
- ABSALAO R. S. 1993. - Alvania valeriae (Gastropoda: Rissoidae), a new species from off Southeastern Brazil. The Nautilus 107 (3): 104 - 106. https: // www. biodiversitylibrary. org / page / 8496993
- OLIVEIRA C. D. C., PIMENTA A. D., FIGUEIRA R. M. A. & ABSALAO R. S. 2018. - Critical review of type specimens deposited in the Malacological collection of the biological institute / Ufrj, Rio de Janeiro, Brazil. Zootaxa 4415 (1): 91 - 117. https: // doi. org / 10.11646 / zootaxa. 4415.1.4