The generic namePleioptygma is composed from the Greek word "pleios", which means "full" and from the Greek word "ptygma", which means "fold".[1] This is a reference to the numerous folds on the columella of the shell.
Descriptionedit
In the genus Pleioptygma, the shell is medium to large in size.[1] The shell has mainly spiral sculpture.[1]
Subfusiform; aperture long; columella with very oblique plaits, numerous, alternated in size, or irregular, the largest being the second one from above.
Although the shell of these gastropods looks similar to that of mitrids (family Mitridae), they are unrelated enough to require their own family.
The family Pleioptygmatidae has been defined based on the anatomy of the only extant species Pleioptygma helenae: The foot is relatively large in comparison to the size of the shell.[1] Also the snout is relatively large.[1] The foregut (of the digestive system) is different from other families within the Muricoidea.[1] The proboscis is introvert, with a proboscis bulb that has an extreme thick wall.[1] The proboscis bulb is connected directly to the buccal mass.[1] There is no epiproboscis.[1]
Speciesedit
Species within the genus Pleioptygma include:
† Pleioptygma brandyceae Petuch, 1994 - photo of the holotype
Wikimedia Commons has media related to Pleioptygma.
This article incorporate public domain text from the reference [2]
^ abcdefghijklmnopqrQuinn J. F. Jr. (1989). "Pleioptygmatidae, a new family of mitriform gastropods (Prosobranchia: Neogastropoda)". The Nautilus103(1): 13-19.
pleioptygma, genus, large, snails, marine, gastropod, mollusks, superfamily, muricoidea, temporal, range, miocene, recent, preꞒ, ntwo, views, shell, helenaescientific, classificationkingdom, animaliaphylum, molluscaclass, gastropoda, unranked, clade, caenogast. Pleioptygma is a genus of large sea snails marine gastropod mollusks in the superfamily Muricoidea PleioptygmaTemporal range Miocene Recent 1 PreꞒ Ꞓ O S D C P T J K Pg NTwo views of a shell of Pleioptygma helenaeScientific classificationKingdom AnimaliaPhylum MolluscaClass Gastropoda unranked clade Caenogastropodaclade Hypsogastropodaclade NeogastropodaSuperfamily MuricoideaFamily PleioptygmatidaeJ F Quinn 1989 1 Genus PleioptygmaConrad 1863 2 Pleioptygma is the type genus of the family Pleioptygmatidae 3 and it is the sole genus in the family Pleioptygmatidae 1 4 Contents 1 Etymology 2 Description 3 Species 4 ReferencesEtymology editThe generic name Pleioptygma is composed from the Greek word pleios which means full and from the Greek word ptygma which means fold 1 This is a reference to the numerous folds on the columella of the shell Description editIn the genus Pleioptygma the shell is medium to large in size 1 The shell has mainly spiral sculpture 1 The type description of the genus Pleioptygma by Timothy Abbott Conrad 1863 2 reads as follows Subfusiform aperture long columella with very oblique plaits numerous alternated in size or irregular the largest being the second one from above Although the shell of these gastropods looks similar to that of mitrids family Mitridae they are unrelated enough to require their own family The family Pleioptygmatidae has been defined based on the anatomy of the only extant species Pleioptygma helenae The foot is relatively large in comparison to the size of the shell 1 Also the snout is relatively large 1 The foregut of the digestive system is different from other families within the Muricoidea 1 The proboscis is introvert with a proboscis bulb that has an extreme thick wall 1 The proboscis bulb is connected directly to the buccal mass 1 There is no epiproboscis 1 Species editSpecies within the genus Pleioptygma include Pleioptygma brandyceae Petuch 1994 photo of the holotype Pleioptygma carolinense Conrad 1840 type species 1 from Pliocene 1 The type species is extinct 3 Pleioptygma debrae Petuch 1994 photo of the holotype Pleioptygma heilprini Cossmann 1899 1 Pleioptygma helenae Radwin amp Bibbey 1972 5 It is the only known living species in this genus 1 Pleioptygma kissimmeensis Petuch 1994 photo of the holotype Pleioptygma limonensis Olsson 1922 2 Pleioptygma lindae Petuch 1991 Pleioptygma lineolatum lineolatum Helprin 1887 1 Pleioptygma lineolatum saginatum Tucker amp Wilson 1933 1 Pleioptygma nancyae Petuch 1994 photo of the holotype Pleioptygma prodroma Gardner 1937 1 Pleioptygma ronaldsmithi Petuch 1994 photo of the holotype Pleioptygma swainsonii Broderip 1836 3 Pleioptygma zaca Strong et al 1933 4 References edit nbsp Wikimedia Commons has media related to Pleioptygma This article incorporate public domain text from the reference 2 a b c d e f g h i j k l m n o p q r Quinn J F Jr 1989 Pleioptygmatidae a new family of mitriform gastropods Prosobranchia Neogastropoda The Nautilus 103 1 13 19 a b c Conrad T A 1863 Catalogue of the Miocene shells of the Atlantic slope Proceedings of the Academy of Natural Sciences of Philadelphia 1862 14 10 12 559 583 page 563 a b Bouchet Philippe Rocroi Jean Pierre Fryda Jiri Hausdorf Bernard Ponder Winston Valdes Angel amp Waren Anders 2005 Classification and nomenclator of gastropod families Malacologia 47 1 2 Hackenheim Germany ConchBooks 1 397 ISBN 3 925919 72 4 ISSN 0076 2997 in Czech de Bruyne R H 2004 Encyklopedie ulit a lastur Rebo Productions 336 pp ISBN 80 7234 288 6 page 191 Pleioptygma helenae Radwin amp Bibbey 1972 Retrieved through World Register of Marine Species on 24 April 2010 Retrieved from https en wikipedia org w index php title Pleioptygma amp oldid 1194452063, wikipedia, wiki, book, books, library,
