Keywords: Diadematidae, pedicellariae, sea urchins, Brazil, taxonomy.
ascensionis and discuss the importance of the pedicellariae for the correct identification of the species.
In order to produce photos of the valves of selected tridentate pedicellariae with a scanning electron microscopy (SEM), these were placed in solutions of sodium hipochloride (NaClO) (household bleach) at 2.
A total of 150 pedicellariae, 100 of which tridentate, 25 claviform and 25 triphyllous, were extracted from this material.
Of these, all metamorphosed with a set of five primary podia growing from the left hydrocoel and between one and three pedicellariae
, one on the dorsal surface associated with the base of the dorsal arch spicule, and two posterior on the left side--one at the base of the posterodorsal arm rod and one at the base of the pastoral arm rod (Fig.
In larvae, day 20 coincides with the first appearance of the rudiment stage and day 24 coincides with the first appearance of pedicellariae.
Development of Lytechinus variegatus in this work was much slower than reported by McEdward and Herrera (1999), who obtained full development of the rudiment and pedicellariae by days 8-9 at a higher temperature of 26[degrees]C and a richer diet either of 8,000 cells [ml.
They had 5 primary podia, some short juvenile spines projecting in pairs from the aboral surface near the podia, and pedicellariae retained from the larval body (Fig.
variolaris each also have 5 or more pedicellariae on the larval body, whereas larvae of G.
Responses to these stimuli range from local reflex reactions in the spines, pedicellariae, a nd tube feet to fully coordinated responses in which the whole organism moves toward or away from a stimulus source.
Jaw responses of tridentate and ophiocephalous pedicellariae.
The responses of pedicellariae from Echinus esculentus (L.