Amatholedonta bimunita ( Connolly, 1939 ),

Herbert, David G., 2020, Revision of the aperturally dentate Charopidae (Gastropoda: Stylommatophora) of southern Africa - genus Afrodonta s. lat., with description of five new genera, twelve new species and one new s, European Journal of Taxonomy 629, pp. 1-55: 21-24

publication ID

https://doi.org/10.5852/ejt.2020.629

publication LSID

lsid:zoobank.org:pub:ECEBD539-6E3E-45BE-A0CB-264DF3270CC0

DOI

http://doi.org/10.5281/zenodo.3804728

persistent identifier

http://treatment.plazi.org/id/03C78785-4618-FFD5-41AE-40513509FD99

treatment provided by

Valdenar

scientific name

Amatholedonta bimunita ( Connolly, 1939 )
status

gen. et comb. nov.

Amatholedonta bimunita ( Connolly, 1939)  gen. et comb. nov.

Figs 8View Fig A–D, 9, 18C–D

Afrodonta bimunita Connolly, 1939: 256  , text-fig. 19(10), pl. 6, figs 1–4.

Afrodonta bimunita  – Solem 1970: 363.

Diagnosis

Shell relatively large, deeply biconcave; protoconch with globose apical cap, smooth (diameter ±305 μm); teleoconch sculptured by distinct, close-set, compound axial riblets; intervals between riblets with numerous fine intermediary axial threads; spiral sculpture of indistinct microscopic spiral threads, usually strongest in umbilicus. Aperture narrowly lunate; parietal dentition lacking; palatal region with 1–3 axially aligned rows of small denticles set back ⅛ to ⅓ whorl behind outer lip, outermost row sometimes visible through aperture, other rows apparent only through translucent shell; each row with up to 5 denticles, with an additional small baso-columellar denticle (easily overlooked); number of denticles and position of rows somewhat variable and related to degree of development; those below periphery more elongate, those above more rounded. Shell translucent, honey-brown when fresh; diameter up to 2.0 mm.

Material examined

Holotype

SOUTH AFRICA • E. Cape, Amatola [Amathole] Mtns, Hogsback; R.F. Lawrence leg.; SAMC MB- A008142. 

Paratype

SOUTH AFRICA • 1 specimen; same collection data as for holotype; NHMUK 1937.12.30.2726  .

Other material

SOUTH AFRICA – E. Cape • 14 specimens; Hogsback, environs of Madonna and Child waterfall ; 32.60703° S, 26.96268° E; 1075 m a.s.l.; 25 Jan. 2002; D.G. Herbert, M. Bursey and G. Redman leg.; indigenous forest, under log; NMSA V9795View MaterialsGoogleMaps  1 specimen; Hogsback, Madonna and Child Falls walk ; 32.60701° S, 26.96257° E; 1075 m a.s.l.; 6 Apr. 2014; D.G. Herbert, L.S. Davis and M. Cole leg.; station 14-02, southern mistbelt forest, in leaf-litter; NMSA W9740View MaterialsGoogleMaps  5 specimens; Hogsback, Madonna and Child area ; 32.60611° S, 26.96250° E; 1075 m a.s.l.; 31 Dec. 2008; indigenous forest; M. and K. Cole leg.; NMSA W6658View MaterialsGoogleMaps  3 specimens; same collection data as preceding; ELM D16119View MaterialsGoogleMaps  2 specimens; Hogsback Forest Reserve ; 32.60° S, 26.93° E; 1300 m a.s.l.; 19 Feb. 1997; D. Barraclough and S. James leg.; indigenous forest, sorted from dried leaf-litter sample; NMSA V4876View MaterialsGoogleMaps  1 specimen; Hogsback, Hobbiton Forest ; 32.59658° S, 26.95749° E; 1180 m a.s.l.; 6 Apr. 2014; D.G. Herbert, M. Cole and L.S. Davis leg.; station 14-01, southern mistbelt forest, in leaf-litter; NMSA W9751View MaterialsGoogleMaps  4 specimens; Hogsback ; 32.58935° S, 26.93563° E; 1220 m a.s.l.; 21 Jan. 2005; A. Moussalli and D. Stuart-Fox leg.; indigenous forest, in leaf-litter; NMSA W2841View MaterialsGoogleMaps  1 specimen; same collection data as preceding; NMSA W4464View MaterialsGoogleMaps  6 specimens; Stutterheim, Kologha Forest , waterfall walk from picnic site; 32.53387° S, 27.43083° E; 22 Dec. 2009; M. Cole leg.; ELM D16196View MaterialsGoogleMaps  5 specimens; Stutterheim, Kologha Forest, forest drive near Protea Hill ; 32.5558° S, 27.3175° E; 26 Jan. 2009; M. Cole leg.; ELM D16161View MaterialsGoogleMaps  .

Distribution and conservation

A narrow-range endemic ( Fig. 9View Fig), known only from the Hogsback to Stutterheim area in the Amathole Mountains, E. Cape, at 1075–1300 m a.s.l.; in leaf-litter of southern mistbelt forest. Both the Hogsback and Kologha forests are formally protected areas.

Remarks

Resembles its congener Amatholedonta fordycei  gen. et sp. nov.; however, in the latter the axial sculpture is finer and there are only three denticles in each of the rows of palatal teeth. Biomphalodonta forticostata  gen. et sp. nov. has a similarly shaped shell, but the axial sculpture is much coarser, the rows of palatal denticles are more distinctly C-shaped and the minute denticle at the junction of the basal and columellar lips is lacking. In addition, the protoconch of B. forticostata  gen. et sp. nov. has distinct axial sculpture.

Whereas Connolly (1939) cited six palatal denticles per row in Am. bimunita  gen. et comb. nov., Solem (1970) cited only five. This discrepancy indicates either that Solem overlooked the minute basocolumellar denticle or that the NHMUK specimen he examined had fewer denticles than the holotype described by Connolly (this is sometimes the case). Since Solem described the lowest denticle as being the most posterior and the middle two the most anterior, this would suggest that he overlooked the basocolumellar denticle, which is slightly anterior to the lowest palatal denticle.

SAMC

South Africa, Cape Town, Iziko Museum of Capetown (formerly South African Museum)

SAMC

Iziko Museums of Cape Town

NMSA

KwaZulu-Natal Museum

ELM

East London Museum

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Stylommatophora

Family

Charopidae

Genus

Amatholedonta

Loc

Amatholedonta bimunita ( Connolly, 1939 )

Herbert, David G. 2020
2020
Loc

Afrodonta bimunita

Connolly M. 1939: 256
Loc

Afrodonta bimunita

Solem A. 1970: 363