Well done Guido! ------------- Interesting topic these large shells, so I took a quick look in our systems. In front of the names the size in mm, based on the present WRS list. B stands for Bivalvia Top 25 list of recent marine shelled molluscs 1532 Kuphus polythalamia B 1368 Tridacna gigas B 970 Pinna nobilis B 772 Syrinx aruanus 621 Tridacna derasa B 616 Pleuroploca gigantea 590 Pinna rugosa B 550 Melo amphora 496 Turbinella angulata 494 Adelomelon beckii 490 Charonia tritonis 476 Tridacna squamosa B 467 Siliquaria ponderosa 463 Hippopus porcellanus B 455 Melo miltonis 450 Melo umbilicatus 437 Brechites giganteus B 432 Atrina vexillum B 427 Tutufa bardeyi 423 Hemifusus colosseus 421 Pinna rudis B 419 Lambis truncata 418 Turbinella laffertyi 415 Livonia nodiplicata 410 Cassis cornuta or 410 Hemifusus crassicaudus (more correct measurements will point out which one deserves place 25) The 25 largest recent marine Gastropods 772 Syrinx aruanus 616 Pleuroploca gigantea 550 Melo amphora 496 Turbinella angulata 494 Adelomelon beckii 490 Charonia tritonis 467 Siliquaria ponderosa 455 Melo miltonis 450 Melo umbilicatus 427 Tutufa bardeyi 423 Hemifusus colosseus 419 Lambis truncata 418 Turbinella laffertyi 415 Livonia nodiplicata 410 Cassis cornuta 410 Hemifusus crassicaudus 409 Cassis madagascariensis 404 Pleuroploca princeps 402 Melo broderipii 395 Charonia lampas 387 Hemifusus tuba 385 Cymbium glans 382 Adelomelon riosi 380 Strombus goliath 372 Livonia mammilla Excluded because not well defined: 550 Pinna bicolor 422 Atrina maura 413 Busycon sinistrum 404 Turbinella scolymoides + Serpulorbis and Petaloconchus This list has been made quickly using the databases of Conchology, Inc. More study may reveal minor changes, but the general image is most probably close to correct. Mabuhay from Mactan island, the Philippines. Guido T. Poppe Conchology, Inc. Cebu Light Industrial Park, Basak, Lapu-Lapu City, Cebu, Philippines 6015 Phone #: +63 32 495 9990 Fax #: +63 32 495 9991 Websites: www.conchology.be www.poppe-images.com www.mambele.be Email: [log in to unmask] ---------------------------------------------------------------------- [log in to unmask] - a forum for informal discussions on molluscs To leave this list, click on the following web link: http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1 Type your email address and name in the appropriate box and click leave the list. ----------------------------------------------------------------------