Nerita undata Linnaeus, 1758

Mustapha, Nurshahida, Baharuddin, Nursalwa, Tan, Siong Kiat & Marshall, David J., 2021, The neritid snails of Brunei Darussalam: their geographical, ecological and conservation significance, Ecologica Montenegrina 42, pp. 45-61 : 51

Nerita undata Linnaeus, 1758

Figs. 2K–L and 4F

Nerita undata Linnaeus, 1758: 779 .

Nerita undata – Tan & Clements, 2008: 487, figs. 3-21, 3-22; Zvonareva & Kantor, 2016: 408 , figs. 3G, 3H. Nerita (Cymostyla) undata – Eichhorst, 2016a: 583, pl. 184.

Material. UBDM.7.00080. Sample was collected from PP.

Abundance. Abundant.

Habitat. Rocky shore. Mid to high shore.

Local distribution. PP, MC and ES.

Ecology and conservation. The species has been found to rapidly repopulate areas, following habitat degradation. It occupies a similar niche to N. chamaeleon with which it seemingly competes, but usually extends higher on the shore. Unlike N. chamaeleon , N. undata appears less tolerant of high-suspendedsediment loads in water and sedimentation of the shoreline. Low conservation concern because of apparent high recolonization capability on local shores.

Biogeographical distribution. Distributed in HI, SR and BK of Western Coral Triangle and TR, JH, SW, AN, VN and SG of Sunda Shelf. Indo-West Pacific in general ( Frey 2010b).

Figures

Figure 2. Neritidae species found associated with lower estuarine, mangroves and rocky shores of Brunei Darussalam, shown in apertural and abapertural view. A–B. Nerita albicilla Linnaeus, 1758. C–D. Nerita chamaeleon Linnaeus, 1758. E–F. *Nerita patula Récluz, 1841. G–H. *Nerita insculpta Récluz, 1841. I–J. Nerita litterata Gmelin, 1791. K– L. Nerita undata Linnaeus, 1758. M–N. Nerita balteata Reeve, 1855. O–P. Nerita planospira Anton, 1838. Q–R. *Nerita exuvia Linnaeus, 1758. S-T. *Nerita histrio Linnaeus, 1758. (*) indicates a new species record for Brunei Darussalam. Scale bar represents 3 mm.

Figure 4. Side view showing off spire plasticity amongst Nerita species found in Brunei Darussalam. A. Nerita albicilla Linnaeus, 1758. B. Nerita litterata Gmelin, 1791. C. Nerita insculpta Récluz, 1841. D. Nerita patula Récluz, 1841. E. Nerita chamaeleon Linnaeus, 1758. F. Nerita undata Linnaeus, 1758. G. Nerita balteata Reeve, 1855. H. Nerita planospira Anton, 1838. I. Neripteron violaceum (Gmelin, 1791). J. Neripteron cornucopia (Benson, 1836). K. Vittina coromandeliana (G. B. Sowerby I, 1836). L. Neritodryas dubia (Gmelin, 1791). M. Clithon oualaniense (Lesson, 1831). N. Neripteron spirale (Reeve, 1855). O. Nerita histrio Linnaeus, 1758. P. Nerita exuvia Linnaeus, 1758. Markings on I and J: the spire hangs further midway in N. cornucopia compared to N. violaceum. Scale bar on top represents 3 mm, unless stated otherwise.