"Origin of planktotrophy \u2013 evidence from early molluscs"@en . "Origin of planktotrophy, Mollusca"@en . "1520-541X" . "P(GA206/04/0599), S" . "The size of early ontogenetic shells (protoconchs) of ancient benthic molluscs suggests that feeding larvae occurred at about 490 myr (approximately, transition from Cambrian to Ordovician). Most studied Ordovician protoconchs were smaller than Cambrian ones, indicating smaller Ordovician eggs and hatchlings. This suggests substitution of nutritious reserve matter such as yolk by plankton as an energy source for larvae. The observed size change represents the first direct empiric evidence for a late Cambrian to Ordovician switch to planktotrophy in invertebrate larvae. It corroborates previous hypotheses about a possible polyphyly of planktotrophy. These hypotheses were primarily based on molecular clock data of extant clades with different types of larva, change in the overall body size, as well as increasing predation pressure on Early Paleozoic sea floors. The Early Ordovician is characterized by an explosive radiation of benthic suspension feeders and it was suggested that planktotrophy would pro" . "6"^^ . . . "Evolution and Development" . . . . "8" . . "RIV/60460709:41330/06:20787" . . "3"^^ . "Fr\u00FDda, Ji\u0159\u00ED" . "4" . . . "Origin of planktotrophy \u2013 evidence from early molluscs" . . . . "Origin of planktotrophy \u2013 evidence from early molluscs"@en . "491052" . "1"^^ . "[409724FDEEAB]" . "41330" . . "RIV/60460709:41330/06:20787!RIV10-MSM-41330___" . "The size of early ontogenetic shells (protoconchs) of ancient benthic molluscs suggests that feeding larvae occurred at about 490 myr (approximately, transition from Cambrian to Ordovician). Most studied Ordovician protoconchs were smaller than Cambrian ones, indicating smaller Ordovician eggs and hatchlings. This suggests substitution of nutritious reserve matter such as yolk by plankton as an energy source for larvae. The observed size change represents the first direct empiric evidence for a late Cambrian to Ordovician switch to planktotrophy in invertebrate larvae. It corroborates previous hypotheses about a possible polyphyly of planktotrophy. These hypotheses were primarily based on molecular clock data of extant clades with different types of larva, change in the overall body size, as well as increasing predation pressure on Early Paleozoic sea floors. The Early Ordovician is characterized by an explosive radiation of benthic suspension feeders and it was suggested that planktotrophy would pro"@en . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "N\u00FCtzel, A." . "Origin of planktotrophy \u2013 evidence from early molluscs" . . "Lehnert, O." . .