Asterodiscides truncatus ( Coleman, 1911 )

Mah, Christopher L., 2021, The East Pacific / South Pacific Boundary: New taxa and occurrences from Rapa Nui (Easter Island), New Caledonia and adjacent regions, Zootaxa 4980 (3), pp. 401-450 : 409-410

Asterodiscides truncatus ( Coleman, 1911)

Figure 3A–E

Coleman 1911: 699; Fisher 1919: 355; Powell 1937: 78; Fell 1958: 13; Dartnall 1968: 23 (as Asterodiscus ).

Rowe 1977: 200 (as Asterodiscides ).

Comments. This species was identified based on its relatively stellate shape and the presence of enlarged superomarginals which are larger in size than the proximal superomarginals and most of the abactinal tubercles.

This is the first record of this species from New Caledonia and the third species of Asterodiscides from this region. Asterodiscides helenotus ( Fisher, 1913) and A. soelae Rowe, 1985 were documented from New Caledonia by Ameziane (2007).

Occurrence. South Australia , east to Kermadec Islands, New Caledonia. 14–792 m.

Material Examined. MNHN IE-2016-1550 (ex. EcAs 12238). Norfolk Ridge , New Caledonia, 23º41′S, 168º00′E, 237–550 m. Coll . BATHUS 3 , CH 802 Bouchet , Richer, Warén. Coll. 27 Nov. 1993. 1 dry spec . R =2.3, r=1.3.

Figures

FIGURE 3. Asterodiscides truncatus MNHN IE-2016-1550 (New Caledonia): A. Abactinal. Scale bar equals 1.0 cm. B. Close-up of abactinal surface. Scale bar equals 0.5 cm. C. Lateral view showing marginal plates. Scale bar equals 1.0 cm. D. Actinal surface. Scale bar equals 1.0 cm. E. Actinal surface showing spination and furrow spines. Scale bar equals 0.5 cm.