Thyone papuensis Théel, 1886

O’Loughlin, P. Mark, Harding 1, Caroline & Paulay, Gustav, 2016, The sea cucumbers of Camden Sound in northwest Australia, including four new species (Echinodermata: Holothuroidea), Memoirs of Museum Victoria 75, pp. 7-52 : 37-41

Thyone papuensis Théel, 1886

Table 1 ; appendix 1; figures 23, 24

Thyone fusus var. papuensis Théel, 1886: 92 , pl. 7 fig. 1.

Thyone papuensis H. L. Clark, 1921: 167 .— 1932: 221.— 1946: 399.— Clark & Rowe, 1971: 182.—A. M. Clark, 1982: 489, 495, fig. 2.— Cannon & Silver, 1986: 32, fig. 9g.— Liao & Clark, 1995: 504, fig. 306.—Rowe (in Rowe & Gates), 1995: 316.

Type locality. Torres Strait.

Material examined. Northwest Western Australia, Kimberley Region , Camden Sound, WAMSI 1.1 .1, RV Solander , sled, site no LIN_6, WAM station no 16, barcode 10001097, from - 15.27505 S 124.36988 E 46 m to -15.27543 S 124.36918 E 46 m, 18 Mar 2015, WAM Z89057 (1) ; RV Solander , sled, site no SOL_116a, WAM station no 18, barcode 10001259, from - 15.26142 S 124.27518 E 41 m to -15.26172 S 124.27583 E 40 m, 18 Mar 2015, WAM Z89058 (1) ; RV Solander , sled, site no SOL_43, WAM station no 26, barcode 10002102, from -15.488461 124.201824 46 m to -15.488309 124.201113 46 m, 21 Mar 2015, WAM Z89059 (1) (ring eviscerated and lost) ; RV Solander , sled, site no SOL_77, WAM station no 34, barcode 10002542, from - 15.725854 S 124.166978 41 m to -15.726405 124.16756 41 m, 23 Mar 2015, WAM Z89060 (1).

North Kimberley Region , near mouth of King George River, RV Solander, Sled 06, lot number (barcode) 023319, -13.8505 127.28868 45 m, 6 June 2013, WAM Z27863 (1) ( UF tissue lot MOL AF 1463 ) .

Description (Kimberley specimens; preserved in 95% ethanol). Body fusiform, narrow, with long tapers to narrow oral and anal ends, oral and anal ends may be slightly upturned, body (live) up to 35 mm long, up to 17 mm diameter; complete cover of small tube feet, diameters about 0.2 mm, some in longitudinal series; 10 dendritic tentacles, two ventral small; calcareous ring tubular with long posterior prolongations comprising a mosaic of small pieces; inconspicuous anal scales present comprising thick single-layered plates with small perforation, multi-layered components, meshed rods component; single polian vesicle; gonad tubules not branched.

Mid-body ossicles scattered small tables with a spire of two pillars, discs with predominantly four perforations in smaller specimens, two larger central, two smaller distal, many discs in larger specimens with four or more smaller additional perforations, disc lengths commonly 50–55 µm, spire heights 23 µm, spires of two pillars, single apical bridge, apex of spire with two short pillar ends, each with a few blunt spines, spines sometimes with additional secondary spinelet. Tube feet endplates Thyone -like with small central perforations, outer ring of large perforations, marginal rim of small transversely oval perforation, endplates up to 110 µm diameter; support tables in tube feet with elongate, curved discs up to about 120 µm long, four central perforations, single small perforation distally; spires with two pillars, joined apically with few blunt apical spines. Peri-anal body wall with single and multi-layered scale ossicles, tables with multiperforate discs, tube foot support tables differing from mid-body. Tentacles and introvert with fine rods, tables and rosettes; largest rods with bifurcate ends, rods up to 90 µm long; table discs with many perforations, up to about 20; rosettes typically oval, about 30 µm long; rods and rosettes inter-grade in form.

Live colour pale brown to yellow with irregular red to brown patches on body and some tube feet; preserved colour off-white with red-brown to brown patches on body and some tube feet.

Distribution. North Western Australia, Kimberley Region, Camden Sound and King George River region, 40–46 m (this work); Houtman Abrolhos, WA, to Double Island Point, Queensland, 0–60 m ( Rowe & Gates 1995).

Family Thyonidiidae Heding & Panning, 1954 (sensu Smirnov 2012)

Remarks. See O’Loughlin, Mackenzie & VandenSpiegel, 2014.