Actinopyga bacilla Cherbonnier, 1988: 29; fig. 8A-R; Samyn, 2003: 17; Samyn et al., 2006: 55.
Type data: EcHh 4045; Nosy Bé, Navetsy (Madagascar); intertidal; coll. G. Cherbonnier; 5.X.1959; well preserved; well relaxed; not eviscerated; ventro-longitudinal dissection.
Anatomical Description: 165 mm long; 25-45 mm wide; bivium arched; trivium distinctly flattened; mouth ventral; anus terminal; dorsal body wall beige; ventral body wall beige-brown; tentacles beige; color dorsal appendages yellowish; ventral tube feet yellowish; dorsal appendages spread regularly over complete bivium; ventral tube dispersed mainly in ambulacra of trivium; bivium and trivium not separated by lateral fringe of appendages; anal teeth present; body wall 1.5-3.5 mm thick, smooth to the touch; 19 tentacles counted; radial plates with deep posterior indention and 4 small and 1 large anterior indention; intreradial plates narrower than radial ones; length radial plates equal to length interradial ones; number of tentacle ampullae could not be determined; 2 large Polian vesicles; stone canal(s) could not be determined; gonad in single tuft, with ramified tubules; longitudinal muscles bifid, wide, flat, attached at edges; respiratory tree longer than 1/2 of body length; cloaca 45 mm long; Cuvierian tubules absent.
Ossicle description: tentacles with non perforated rods, rugose at ends; dorsal body wall with rosettes and rosette-like rods; ventral body wall with rosettes and rod-like rosettes; Dorsal appendages with large rods and rather compact rosettes; ventral tube feet with rods, rosettes and branched cross-shaped spiny ossicles; longitudinal muscles with rugose rods; cloacal retractor muscles with slightly spined, sometimes perforated slightly swollen rods; cloaca with thick rods, spiny, sometimes branching distally or perforated distally.
Known distribution: Nosy Bé (Madagascar).
Taxonomic decision: nomen inquirendum, comparison with the type material of Actinopyga echinites Jaeger, 1833 needed.
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