Holothuria (Platyperona) crosnieri Cherbonnier, 1988: 103, fig. 42A-Q; Samyn, 2003: 65.
Type data: EcHh 3549; Station 463, Tulear (Madagascar); unknown depth; coll. Thomassin; 27.IX.1962; well preserved; well relaxed; dissected longitudinally.
Anatomical description: 19 mm long; 5.5-8 mm wide; bivium arched; trivium flattened; mouth ventral; anus dorsal; dorsal body wall light brown; ventral body wall white to beige; tentacle color could not be determined; dorsal appendages whitish; ventral tube feet yellowish; dorsal appendages conical, spread regularly over complete bivium; ventral tube feet spread regularly over complete trivium; bivium and trivium not separated by lateral fringe of appendages; body wall 1 mm thick, rough to the touch; number of tentacles could not be counted; radial plates with a slightly indented posterior side, interradial plates narrowever than radial ones; number of tentacle ampullae could not be determined; number of Polian vesicles could not be determined; presence of stone canals could not be determined; gonad not observed; longitudinal muscles bifid, very wide, flat, attached at edges. Cuvierian tubules absent.
Ossicle description: ossicle assemblage of tentacles could not be assessed; dorsal body wall with tables and buttons, table disc perforated by a central hole and one to three rings of peripheral perforations, rim of disc smooth, spire narrow and very high with up to 8 cross-beams ending in a very narrow crown, buttons with undulating, smooth rim, perforated by 4-8 pairs of holes; ventral body wall with tables only, disc perforated by a central hole and 1 to two rings of peripheral holes, rim smooth; spire high with 5-6 cross beams ending a narrow crown; dorsal appendages with tables, buttons and rods, tables as in body wall, buth with spire up to 10 cross beams and disc less wide, buttons as in body wall , rods straight, smooth with central and distal perforated widenings; ventral tube feet with tables, rods and perforated plates, table disc perforated by a central hole and one ring of peripheral holes, spire with 4-5 cross beams ending in a narrow crown, rods straight with distal and central perforated widenings, perforated plates with 3-4 rows of holes; longitudinal muscles and gut devoid of ossicles; osicle assemblage of cloacal retractor muscles, gonad, cloaca, respiratory tree and rete mirabile could not be determined.
Known distribution: Tuléar, Madagascar.
Taxonomic decision: valid species (confirmed after re-examination of the holotype).
For original description click here.
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