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Table 1 Apical cap of Wirenia argentea, test cell numbers and characteristics

From: Of tests, trochs, shells, and spicules: Development of the basal mollusk Wirenia argentea (Solenogastres) and its bearing on the evolution of trochozoan larval key features

Cell position
(tier)
Number of
cells/row
Number of
cilia/cell
Length of
cilia (μm)
Arrangement
of cilia
  
Apical ? 3 × (15-20)* 40-50 tuft   
Pretrochal 1 6-8 numerous 10-15 scattered   
Pretrochal 2 8-10 numerous 10-15 scattered   
Prototrochal 14-16 6 × (20-25)* 25-35 adapical row   
Posttrochal 1 10-12 numerous 10-15 scattered   
Posttrochal 2 12-14 numerous 10-15 adapical row   
Posttrochal 3 2 30-40 10-15 tuft   
  1. * Arranged as compound cilia (cirri).