Chondrocyclus putealis Connolly, 1939,

Cole, Mary L., 2019, Revision of Chondrocyclus s. l. (Mollusca: Cyclophoridae), with description of a new genus and twelve new species, European Journal of Taxonomy 569, pp. 1-92: 46-49

publication ID

https://doi.org/10.5852/ejt.2019.569

publication LSID

lsid:zoobank.org:pub:79BE13FC-B840-4C39-8D25-3328BDCC44D2

persistent identifier

http://treatment.plazi.org/id/101687E3-D57D-FFF8-FDD7-ABE2FB8BD632

treatment provided by

Plazi

scientific name

Chondrocyclus putealis Connolly, 1939
status

 

Chondrocyclus putealis Connolly, 1939 

Figs 16 BView Fig, 22–23View FigView Fig

Chondrocyclus putealis Connolly, 1939: 538  , pl. xvi, figs 25–27 (type loc.: Southport [Puzey]).

Chondrocyclus putealis – Herbert & Kilburn 2004: 91  .

Diagnosis

Shell small, depressed, lenticular; periostracum with dense axial costae expanded into three spiral rows of flanges on last whorl. at periphery around umbilicus and below suture; operculum duplex, multispiral lamella of exterior portion deeply concave, with horizontal shelf of interwoven bristles spiralling up on inside of lamella and connected to a very long, loose fringe reflexed over peristome; radula with three large cusps on second lateral tooth; penis flattened dorsoventrally with lateral expansions of shaft towards distal end, more prominent on left side.

Etymology

The specific name is derived from the Latin ‘ putealis  ’, meaning ‘of or relating to a well’, with reference to the deep well-like operculum.

Type material examined

Syntypes

SOUTH AFRICA – KwaZulu-Natal • 4 specimens; Natal, Southport; NHMUK 1937.12.30.5087– 1937.12.30.5090. ( Fig. 22 AView Fig) 

Other material examined

SOUTH AFRICA – KwaZulu-Natal • 12 specimens; Port Shepstone area, Marble Delta ; 30.6509° S, 30.3560° E; 10 May 2001; D. Herbert leg.; NMSA VView Materials 9390GoogleMaps  . – Eastern Cape • 46 specimens; Mkambati Nature Reserve, Mtentu River gorge, south bank, 4.25 km usptream of mouth; 31.2316° S, 30.0100° E; 31 m a.s.l.; 12 Jan. 2012; M. Cole leg.; ELM D16954View MaterialsGoogleMaps  17 specimens; same collection data as for preceding; ELM WView Materials 03656GoogleMaps  3 specimens in ethanol; same collection data as for preceding; NHMUK 20120272View MaterialsGoogleMaps  3 specimens in ethanol; same collection data as for preceding; NMW. Z.2012.065.00004GoogleMaps  3 specimens in ethanol; same collection data as for preceding; RMNH. MOL 330498View MaterialsGoogleMaps  3 specimens; Mtentu , north bank, 3.25 km upstream of mouth, scarp forest on steep slope with large rocks; 31.231000° S, 30.0174° E; 12 Jan. 2012; M. Cole leg.; ELM D16955View MaterialsGoogleMaps  5 specimens; same collection data as for preceding; ELM WView Materials 03657GoogleMaps  .

Description

SHELL ( Fig. 22View Fig A–D). Small, depressed, lenticular, adult diameter 4.91–5.38 mm, height 2.49–3.26 mm, diameter:height 1.61–2.00 (n = 20). Spire not much raised, apex almost flat ( Fig. 22 A, CView Fig). Embryonic shell ( Fig. 23 AView Fig) approx. 1.75 whorls, microscopically malleate, roughest in centre, junction between embryonic shell and teleoconch evident with appearance of a few weak axial costae, but not sharply demarcated. Teleoconch comprising 2.5–2.75 whorls, moderately convex, rapidly increasing, suture deeply impressed. Aperture circular, last whorl descending strongly near aperture, peristome simple, continuous and free. Umbilicus wid and deep, exposing all the whorls ( Fig. 22DView Fig). Periostracum glossy, honey-brown and lacquer-like with dense lamellate costae at regular intervals, 107–150 (n = 15) on last whorl, expanded into paddle-shaped flanges at periphery and umbilicus, as well as a row of shorter broadly rounded lamellae below suture ( Fig. 22View Fig B–D); flanges bear axial riblets visible at very high magnification ( Fig. 23 BView Fig); intervals between costae with microscopic axial threads.

OPERCULUM ( Fig. 23View Fig D–E, G–H). Duplex, outer multispiral portion with approx. five whorls; lamellar blade high and steep sided, resulting in a deeply concave outer portion with more-or-less perpendicular sides towards the top and curving inwards towards the bottom; upper edge of lamellar blade thickened, forming a horizontal shelf of interwoven bristles which forms a spiral staircase on the inside of the lamellar blade; in the outermost whorl the latter is connected to a very long fringe reflexed over peristome and preventing operculum being withdrawn into shell. In earlier whorls this fringe is not visible and appears fused with the lamella; surface of lamella of last whorl tuberculate at high magnification ( Fig. 23 HView Fig). Shell translucent, glossy, honey-brown when fresh.

RADULA ( Fig. 23 CView Fig). Rachidian with five cusps, central one approx. twice length of outer two on each side, the latter four approx. equivalent length; first and second lateral teeth each with three large cusps, a smaller fourth and a vestigial fifth, second lateral tooth is larger.

PENIS ( Fig. 23 F, IView Fig). Shaft dorsoventrally flattened, with lateral expansions towards the distal end on both sides but more prominent on left, with numerous annular rugae, distal end bulbous and smooth.

Distribution and habitat

Endemic to a narrow range primarily near the coast in southern KwaZulu-Natal and Pondoland (the northeastern region of the Eastern Cape province), between Mtentu in northern Transkei and Southport in southern Kwazulu-Natal, but also recorded inland in the Port Shepstone area (ca 200 m a.s.l.) ( Fig. 16 BView Fig).

Indigenous Scarp Forest ( Mucina & Geldenhuys 2006) on banks of rivers, in leaf litter.

Remarks

Morphological differences between C. putealis  and C. bathrolophodes  are slight. The shell of C. putealis  resembles C. bathrolophodes  in shape but attains slightly smaller size. The position of spiral rows of flanges is similar in the two species, but costae are slightly more dense on average in C. putealis  and the peripheral and umbilical cords stronger than those of C. bathrolophodes  . The opercula of the two species are very similar although the operculum of C. putealis  is deeper with perpendicular sides near the top and curving inward near the disc, while the lamellar blade of C. bathrolophodes  widens evenly towards the top. Both species occupy a relatively narrow range, separated geographically by a wide intervening distance in which C. cooperae  sp. nov. (below) and C. pondoensis  sp. nov. occur. On morphological grounds alone, it was not clear whether C. putealis  and C. bathrolophodes  should indeed be considered distinct species, in spite of subtle differences. In the molecular analyses C. pondoensis  sp. nov. is nested within this group ( Fig. 1View Fig), adding weight to the evidence to treat these lineages as distinct species.

Chondrocyclus putealis  appears to be a very rare species and there are only a few localities where recent specimens could be found and it was patchily distributed at these localities. Chondrocyclus putealis  is replaced by the closely related C. cooperae  sp. nov. westwards along the coast, while C. pondoensis  sp. nov. also extends westwards from Pondoland and is sympatric with both these species. This region of the north-eastern coast of the Eastern Cape is an important centre of cladogenic events in rhytidid molluscs ( Moussalli et al. 2009; Herbert & Moussalli 2010) and is a focus of endemism in sylvian mollusc taxa ( Bursey & Herbert 2004; Herbert & Kilburn 2004; Cole & Herbert 2009; Herbert 2017). Botanically, this area harbours a large number of palaeoendemics and neoendemics concentrated in scarp forests in deep gorges ( van Wyk & Smith 2001; Mucina et al. 2007).

B

Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet

NHMUK

Natural History Museum, London

A

Harvard University - Arnold Arboretum

S

Department of Botany, Swedish Museum of Natural History

E

Royal Botanic Garden Edinburgh

NMSA

KwaZulu-Natal Museum

V

Royal British Columbia Museum - Herbarium

M

Botanische Staatssammlung M�nchen

ELM

East London Museum

W

Naturhistorisches Museum Wien

NMW

Naturhistorisches Museum, Wien

Z

Universit�t Z�rich

RMNH

National Museum of Natural History, Naturalis

C

University of Copenhagen

H

University of Helsinki

F

Field Museum of Natural History, Botany Department

I

"Alexandru Ioan Cuza" University

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Architaenioglossa

Family

Cyclophoridae

Genus

Chondrocyclus

Loc

Chondrocyclus putealis Connolly, 1939

Cole, Mary L. 2019
2019
Loc

Chondrocyclus putealis – Herbert & Kilburn 2004: 91

Herbert D. & Kilburn D. 2004: 91
2004
Loc

Chondrocyclus putealis

Connolly M. 1939: 538
1939