Table 1 in Leiosolenus (Labis) patagonicus (Bivalvia: Mytilidae) from Argentinean sea, taxonomic revision and anatomical notes

Table 1. Seven species belonging to the genus Leiosolenus found in South American waters,with comparison of main morphological characters.
SpeciesExternal sculptureAnterior endMorphology of calcareous projectionMaximum shell lengthDistributionLeiosolenus (Labis) patagonicus (d′Orbigny,1846 in 1834-1847)Smooth with thin calcareous incrustationsRoundedTrigonal,flattened,extended beyond the posterior45 mmSanta Catarina,Brazil to Magellan region and Malvinas/Falkland IslandsLeiosolenus (Labis) attenuatus (Deshayes,1836)Smooth with pustulose incrustationsRoundedNarrowly pointed,not feather-like,extended beyond the posterior end in both valves111 mmEastern Pacific,from California,USA to PeruLeiosolenus (Labis) peruvianus (d′Orbigny,1846 in 1834-1847)Smooth with pustulose incrustationsBroadly roundedNarrowly pointed,feather-like prolonged beyond the posterior end in both valves79 mmLambayeque,Peru to Valparaíso,ChileLeiosolenus spatiosus (Carpenter,1857)Over anterior part and anterolateral valve,vertical irregular wrinklesRoundedwithout posterior projection63 mmSan Felipe,Gulf of California,USA to Bocapán,PerúLeiosolenus (Diberus) bisulcatus (d′Orbigny,1853)Divided in two sections by a sulcus; regular growth lines on the anterior disc,posterior area usually with a second sulcus and covered by calcareous incrustationsAnterior end rounded and higher than the posteriorIncrustation extended beyond the end and smoothly rounded41 mmWestern Atlantic from North Carolina,USA to Vitoria,Brazil.Eastern Atlantic in St.Helen Island.Leiosolenus (Diberus) plumula (Hanley,1843)Radial ornamentation extending from the umbos to the posterior margin of the valvesRoundedFeather-like incrustations beyond the posterior end70 mmCalifornia,USA to Ecuador,reported as introduced in Philippines and AustraliaLeiosolenus (Myoforceps) aristatus (Dillwyn,1817)Concentric growth lines covered by calcareous deposit.TruncatePointed,Crossed52 mmCosmopolitan,Eastern Pacific from California,USA to Ecuador;Western Atlantic from North Carolina to Brazil,Eastern Atlantic from Bay of Biscay to Southern Angola;Southern Mediterranean