Members of the genus Cerithidea are common components of the fauna of mangrove forests, tidal swamps and salt marshes in the Indo-West Pacific province, in marine and brackish conditions. The snails typically rest on the trunks of trees and other vegetation and migrate to the substrate to feed at low tide. In many areas mangrove habitats are under threat and some Cerithidea species are therefore considered to be endangered. In current taxonomic literature, ten species are recognized on the basis of shell morphology. A recently published molecular phylogenetic analysis has increased this to fifteen. The present study is a systematic account of these fifteen recognized species. Of these, two are newly described: C. houbricki and C. andamanensis. The species accounts include full synonymies, detailed descriptions of shells based on 621 museum samples, descriptions of living animals, distribution records and maps, reviews of habitat and ecology, and notes on conservation status.

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Recent shells from Java

The genus Cerithidea Swainson, 1840 (Gastropoda: Potamididae) in the Indo-West Pacific region

/pdf/report-on-a-collection-of-recent-shells-from-obi-and-1r1zhyowtm.pdf

Report on a collection of recent shells from Obi and Halmahera (Moluccas)

A revision of the land snail genus Landouria Godwin-Austin, 1918 (Camaenidae) from Java reveals that this group represents the most diverse land snail radiation on that island. Only six species of Landouria were recognized from Java in the last revision of the genus based on shell characters. Our investigation, which also considers the genitalia as well as DNA sequences, shows that the diversity in Java is much higher. Based on newly collected specimens as well as museum material, twenty-eight species of Landouria from Java are described and figured. To stabilize the nomenclature, neotypes are designated for L. winteriana (Pfeiffer, 1842) and L. rotatoria (Pfeiffer, 1842). Sixteen species are described as new to science, i.e., L. naggsi sp. nov., L. parahyangensis sp. nov., L. nusakambangensis sp. nov., L. petrukensis sp. nov., L. tholiformis sp. nov., L. madurensis sp. nov., L. abdidalem sp. nov., L. sewuensis sp. nov., L. tonywhitteni sp. nov., L. sukoliloensis sp. nov., L. nodifera sp. nov., L. pacitanensis sp. nov., L. zonifera sp. nov., L. pakidulan sp. nov., L. dharmai sp. nov. and L. menorehensis sp. nov. Landouria conoidea (Leschke, 1914) comb. nov., L. intumescens (Martens, 1867) comb. nov., L. moussoniana (Martens, 1867) comb. nov., L. schepmani (Mollendorff, 1897) comb. nov. and L. leucochila (Gude, 1905) comb. nov. are considered valid species of the genus Landouria for the first time. Plectotropis kraepelini Leschke, 1914 syn. nov. is considered a probable synonym of L. winteriana (Pfeiffer, 1842), P. trichotrochium Mollendorff, 1897 syn. nov. is a synonym of L. epiplatia (Mollendorff, 1897) and the preoccupied name Helix squamulosa Martens, 1867 syn. nov. is a synonym of L. madurensis sp. nov. We estimate that there are actually more than fifty species of Landouria in Java because many shell samples could not be classified and because no material is available from several regions of the island. A molecular phylogeny reveals that the species from Java do not form a monophyletic group, but that at least one species from Timor is nested within Javanese clades. This means that the Oriental Landouria crossed Wallace’s line, the supposed border between the Oriental and Australo-Papuan regions, at least twice and supports the conclusion that Wallace’s line does not represent a more severe barrier for terrestrial organisms than other straits through the archipelago. Within the Javanese clades, species from western and eastern Java are mixed, indicating frequent dispersals also within Java.

background

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Revision of the land snail genus Landouria Godwin-Austen, 1918 (Gastropoda, Camaenidae) from Java

/pdf/recent-shells-from-java-3kz62rsx6w.pdf

Best known for his ideas relating to evolution, French naturalist Jean-Baptiste Lamarck (1744–1829) first built his reputation as a botanist and was elected to the prestigious Academie des Sciences in 1779. His career took a new turn in 1793 when he was made professor of 'insects, worms and microscopic animals' at the Museum National d'Histoire Naturelle, although he lacked prior knowledge of the subject area. Undaunted, Lamarck set out to classify organisms which few naturalists had considered worthy of study since Linnaeus. He was the first to distinguish vertebrates from 'invertebrates' - a term he coined - by the presence of a vertebral column. In this groundbreaking seven-volume work, published between 1815 and 1822, he arranges invertebrates into twelve classes, laying the foundations for the modern study of these organisms. Volume 1, first published in 1815, introduces zoological concepts and begins the classification with the simplest microscopic organisms, the infusoria.

Histoire Naturelle des Animaux sans Vertebres

Manuel de conchyliologie et de paléontologie conchyliologique

/pdf/essai-d-un-nouveau-systeme-des-habitations-des-vers-testaces-3ykayg9j05.pdf

Essai d'un nouveau système des habitations des vers testacés : avec XXII planches / par Chrétien Fréderic Schumacher.

Essai d'un nouveau système des habitations des vers testacés :

Die systematische Naturkunde hat ihre Hauptstütze in einer genauen Kenntniss und Angabe der grösseren oder weiteren Abschnitte des Systems. Wie dieser Grundsatz in allen drei Reichen der Natur überhaupt gleiche Gültigkeit hat, so in der Zoologie und den verschiedenen Abtheilungen derselben insbesondere. Auch in der Malakozoologie gilt dieser Grundsatz, und er bedarf in derselben um so mehr einer sorgfaltigen Rücksicht, als bei den Mollusken, in Ermangelung des weichen Thieres, bisher vielmals nur das Gehäus, oder dieses doch vorzugsweise, die Kennzeichen der grösseren Abschnitte, insonderheit aber der Gattungen verleihen konnte, was in rein zoologischem Sinne, der hauptsächlich anatomisch -physiologische Verhältnisse zu berücksichtigen hat, nicht genügend jst, da die harten Theile des Weichthieres nur eine mittelbare Beziehung zu dem Thicrleben selbst haben, denn sie sind eigentlich nurProducte des lebenden Weichthiers, die, einmal gebildet, keiner weiteren Metamorphose, keinem vitalen Stoffwechsel unterliegen. Aber gerade die hierin begründete Selbstständigkeit, zugleich mit ihrer Dauerhaftigkeit, macht die harten Theile, oder Gehäuse, nicht

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Recent shells from Java

Citations

The genus Cerithidea Swainson, 1840 (Gastropoda: Potamididae) in the Indo-West Pacific region

Report on a collection of recent shells from Obi and Halmahera (Moluccas)

Revision of the land snail genus Landouria Godwin-Austen, 1918 (Gastropoda, Camaenidae) from Java

References

Histoire Naturelle des Animaux sans Vertebres

Manuel de conchyliologie et de paléontologie conchyliologique

Essai d'un nouveau système des habitations des vers testacés : avec XXII planches / par Chrétien Fréderic Schumacher.

Essai d'un nouveau système des habitations des vers testacés :

The genera of Recent and fossil shells, for the use of students in conchology and geology

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