Chondrocyclus devilliersi, Cole, 2019

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 : 37-39

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/3F362337-8D53-4763-A67D-9852125813E1

taxon LSID

lsid:zoobank.org:act:3F362337-8D53-4763-A67D-9852125813E1

treatment provided by

Plazi

scientific name

Chondrocyclus devilliersi
status

sp. nov.

Chondrocyclus devilliersi   sp. nov.

urn:lsid:zoobank.org:act:3

Figs 10 I, L View Fig , 16 A View Fig , 18 View Fig

Chondrocyclus putealis – Herbert & Kilburn 2004: 91   .

Diagnosis

Shell small, depressed, lenticular; protoconch not mammillate; periostracum with widely spaced axial costae developing at the periphery broad rounded flanges, semi-circular in shape; operculum duplex, exterior portion very shallowly concave to almost flat, with step-shaped multispiral lamella terminating in a short fringe of fused bristles.

Etymology

Named for Div DeVilliers whose unwaivering dedication to nature conservation in the Eastern Cape province, and the Transkei in particular, has helped preserve the remaining forests and their biota.

Type material examined

Holotype

SOUTH AFRICA – Eastern Cape • Nqadu Forest, 19 km north of Mthatha, Transkei Mistbelt Forest ; 31.4173° S, 28.7320° E; 17 Jan. 2017, M. Cole and R. Cawood leg.; in leaf litter; NMSA P 1141 View Materials / T 4312. ( Fig. 10 View Fig I–L) GoogleMaps  

Paratypes

SOUTH AFRICA – Eastern Cape • 44 specimens; same collection data as for holotype; ELM D18243 View Materials / T 173 GoogleMaps   33 specimens; same collection data as for preceding; ELM W 3962 View Materials / T 174 GoogleMaps   4 specimens; same collection data as for preceding; NMSA P 0641 View Materials / T 4158 GoogleMaps   1 dry specimen; same collection data as for preceding; NHMUK 20180581 View Materials GoogleMaps   3 specimens in ethanol; same collection data as for preceding; NHMUK 20180582 View Materials GoogleMaps   1 specimen; same collection data as for preceding; NMW. Z.2019.004.00001 GoogleMaps   2 specimens in ethanol; same collection data as for preceding; NMW. Z.2019.004.00002 GoogleMaps   1 specimen; same collection data as for preceding; NMW. Z.2019.004.00003 GoogleMaps   3 specimens in ethanol; same collection data as for preceding; RMNH. MOL.340754 GoogleMaps   1 specimen; same collection data as for preceding; RMNH. MOL.340755 GoogleMaps   11 specimens; Nqadu Forest, 19 km north of Mthatha, Transkei Mistbelt Forest ; 31.4241° S, 28.7547° E; 16 Apr. 2015; M. and K. Cole leg.; in leaf litter; ELM D17922 View Materials / T 116 GoogleMaps   4 specimens; same collection data as for preceding; ELM W 3861 View Materials / T 117 GoogleMaps   2 specimens; same collection data as for preceding; 26 Jan. 2013; M. Cole, V. Ndibo and T. Morgenthal leg.; ELM D17147 View Materials / T 115 GoogleMaps   1 specimen; same collection data as for preceding; ELM W 3716 View Materials / T 167 GoogleMaps   1 specimen; Nqadu Forest, north of Mthatha, Southern Mistbelt Podocarpus   forest; 31.4278° S, 28.7520° E; 12 May 2001; D. Herbert leg.; in leaf litter; NMSA V 9111 View Materials / T 4110 GoogleMaps   4 specimens; Bele Forest, 32 km NNW of Mthatha, northern end of Langeni escarpment, Transkei Mistbelt Forest ; 31.3279° S, 28.6790° E; 18 Jan. 2017; M. Cole and R. Cawood leg.; in leaf litter; ELM D18238 View Materials / T 175 GoogleMaps   12 specimens; same collection data as for preceding; ELM W 3949 View Materials / T 176 GoogleMaps   2 specimens; same collection data as for preceding; NMSA P 1126 View Materials / T 4295 GoogleMaps   .

Description

SHELL ( Fig. 18 View Fig A–C). Small, depressed, lenticular, adult diameter 5.01–6.01 mm, height 2.59–3.17 mm, diameter:height 1.70–2.16 (n = 16). Spire not much raised, apex almost flat. Embryonic shell ( Fig. 18 View Fig D– E) nearly 2.25 whorls, microscopically malleate, junction between embryonic shell and teleoconch evident with development of costae on teleoconch. Teleoconch comprising 2.75 whorls, convex, rapidly increasing, suture deeply impressed. Aperture circular, last whorl descending near aperture, peristome simple, continuous and free. Umbilicus wide and deep, exposing all the whorls. Periostracum glossy, honey-brown and lacquer-like with widely spaced lamellate axial costae at regular intervals, 65–77 (n = 4) on last whorl, expanded into a single row of semi-circular flanges at periphery ( Fig. 18D View Fig ). Shell translucent, glossy, corneous yellow-brown when fresh.

OPERCULUM ( Fig. 18 View Fig F–G). Duplex, outer portion slightly concave; lamella of outer multispiral portion with 4.5 whorls, step-shaped; upper edge of lamella thin and projects slightly above fringe. Radula ( Fig. 18 H View Fig ). Rachidian with five cusps, central cusp approx. twice length of outer two on each side; first and second lateral teeth similar but second is slightly larger, each with four cusps and a vestigial fifth; first three cusps gradually increasing in size from centre outwards and fourth very small.

PENIS ( Fig. 18 View Fig I–J). Shaft dorsoventrally flattened, with lateral expansions of shaft on both sides towards distal end but more prominent on left, with numerous annular rugae, smooth distal end narrower, intromittent organ relatively long.

Distribution and habitat

Known only from two forests, Nqadu approx. 20 km north of Mthatha and Bele to the north-west. Transkei Mistbelt Forest ( von Maltitz et al. 2003), in leaf litter ( Fig. 16 A View Fig ).

Remarks

Chondrocyclus devilliersi   sp. nov. has several unique morphological features and in the molecular analyses it was not closely related to other species of Chondrocyclus   in the Eastern Clade. Although the majority of adult specimens are worn even when collected alive and display few features of the periostracum, the fresh juveniles reveal that there is only one row of expanded flanges around the periphery of the shell ( Fig. 18D View Fig ) and not multiple spiral rows on the body whorl as in other members of the Eastern clade. This resembles the pattern in C. convexiusculus   and species in the Southern-Eastern Cape clade.

The radula resembles that of the coastal taxa C. bathrolophodes   , C. putealis   and C. cooperae   sp. nov. with varying sizes of cusps, while the flat operculum is quite unlike the deeply concave operculum of these species.

F

Field Museum of Natural History, Botany Department

A

Harvard University - Arnold Arboretum

E

Royal Botanic Garden Edinburgh

I

"Alexandru Ioan Cuza" University

L

Nationaal Herbarium Nederland, Leiden University branch

S

Department of Botany, Swedish Museum of Natural History

M

Botanische Staatssammlung M�nchen

R

Departamento de Geologia, Universidad de Chile

NMSA

KwaZulu-Natal Museum

P

Museum National d' Histoire Naturelle, Paris (MNHN) - Vascular Plants

T

Tavera, Department of Geology and Geophysics

ELM

East London Museum

W

Naturhistorisches Museum Wien

NMW

Naturhistorisches Museum, Wien

Z

Universit�t Z�rich

RMNH

National Museum of Natural History, Naturalis

K

Royal Botanic Gardens

V

Royal British Columbia Museum - Herbarium

H

University of Helsinki

C

University of Copenhagen

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Architaenioglossa

Family

Cyclophoridae

Genus

Chondrocyclus

Loc

Chondrocyclus devilliersi

Cole, Mary L. 2019
2019
Loc

Chondrocyclus putealis – Herbert & Kilburn 2004: 91

Herbert D. & Kilburn D. 2004: 91
2004