Bursa granularis (Röding, 1798) is a tonnoidean gastropod that is regarded as broadly distributed throughout the Indo-Pacific and tropical western Atlantic. Because of its variable shell it has received no less than thirteen names, now all synonymized under the name B. granularis. We sequenced a fragment of the cox1 gene for 82 specimens covering a large part of its distribution and most type localities. Two delimitation methods were applied, one based on genetic distance (ABGD) and one based on phylogenetic trees (GMYC). All analyses suggest that specimens identified as B. granularis comprise four distinct species: one limited to the tropical western Atlantic, another to southwestern Western Australia and two in the Indo-Pacific (from the Red Sea to the open Pacific) that are partly sympatric—but not syntopic—in Japan, the Philippines, Vanuatu and New Caledonia. Based on comparison of shell characters, we applied the following available names to the four species, respectively: B. cubaniana (d’Orbigny, 1841), B. elisabettae Nappo, Pellegrini & Bonomolo, 2014, B. granularis s. s. and B. affinis Broderip, 1833. We provide new standardized conchological descriptions for each of them. Our results demonstrate that a long planktotrophic larval stage, common among Tonnoidea, does not necessarily ensure a circumtropical species distribution.

INHACA 2011, KARUBENTHOS 2012, MAINBAZA, PAKAIHI I TE MOANA, PANGLAO 2004, PAPUA NIUGINI, SANTO 2006, TERRASSES, Restreint

Bursidae Thiele, 1925 is a moderately diverse group of extant tonnoidean gastropods with a significant fossil record. We review the fossil record of the family. We exclude some taxa from Bursidae, particularly the most ancient ones: Hanaibursa aquilana (Parona, 1909) (Aptian) and Bursa saundersi Adegoke, 1977 (Selandian). We exclude the genus Olequahia Stewart, 1926; its posterior siphonal canal is not analogous with that of Bursidae. We also discuss the possible revision of the type genus, Bursa Röding, 1798, on the basis of previously published phylogenies; the genus is not monophyletic. We create two new genera, Olssonia n. gen. (type species: Bursa chira Olsson, 1930) and Aquitanobursa n. gen. (type species: Ranella grateloupi d’Orbigny, 1852), containing only fossil species. Lectotypes are designated for Ranella grateloupi d’Orbigny, 1852, Ranella morrisi d’Archiac & Haime, 1853 and Apollon pelouatensis Cossmann & Peyrot, 1924. Based on this revision of the fossil record, we propose five fossil calibration points that can be used to date molecular phylogenetic trees of Bursidae.

EBISCO, MAINBAZA, SANTO 2006

With 59 Recent species, Bursidae, known as «frog shells», are a small but widely distributed group of tropical and subtropical gastropods that are most diverse in the Indo-West Pacific. The present study is aimed at recon­ structing phylogenetic relationships of bursid gastropods based on extensive and representative taxon sampling. Five genetic markers (cytochrome c oxidase subunit I (cox1), 16 s and 12 s rRNA mitochondrial genes, 28 s rRNA and Histone H3 nuclear gene) were sequenced for over 30 species in every known genus but Crossata. Furthermore, we sequenced the complete mt-genome of 9 species (10 specimens) (Aspa marginata, Marsupina bufo, Korrigania quirihorai, Korrigania fijiensis, Tutufa rubeta, Bursa lamarckii, Lampasopsis rhodostoma (twice), Bufonaria perelegans and Bursa aff. tuberosissima). Our analysis recovered Bursidae as a monophyletic group, whereas the genus Bursa was found to be polyphyletic. The genera Talisman and Dulcerana are resurrected and the genera Alanbeuella gen. nov. and Korrigania gen. nov. are described. Dating analysis using 21 extinct taxa for node and simplified tip calibrations was performed, showing a diversification of the group in two phases. Diversification may be linked to tectonic events leading to biodiversity relocation from the western Tethys to­ ward the Indo-Pacific.

ATIMO VATAE, CONCALIS, EBISCO, EXBODI, GUYANE 2014, INHACA 2011, KARUBENTHOS 2, KARUBENTHOS 2012, MAINBAZA, MIRIKY, NORFOLK 1, NORFOLK 2, PAKAIHI I TE MOANA, PANGLAO 2004, PANGLAO 2005, PAPUA NIUGINI, SALOMON 2, SANTO 2006, TERRASSES, Tuhaa Pae 2013, Restreint, ZhongSha 2015