Zenometridae, A. H. Clark, 1909

Zenometridae View in CoL gen.et sp. indet. ( Fig. 15)

Material examined: MNHN-IE-2016-1652, South Pacific , 15.9650°S, 147.1447°W, depth 462–980 m, 1 October 2009 GoogleMaps . MNHN-IE-2023-89, South Pacific , 9.3167°S, 140.1333°W, depth 1107 m, 3 September 2009 GoogleMaps .

Description: MNHN-IE-2016-1652. Centrodorsal long conical in shape. D = 3.7 mm, H = 7.0 mm, H/D = 1.9. The aboral pole is conical in form. Cirrus sockets separated interradially by narrow flat strip ( Fig. 15A).

Cirri LXI (functional sockets). Functional cirrus sockets in three columns per radial area in centrodorsal. Each column with 3–5 functional sockets. Six to nine obsolete sockets per radial area. Fulcral bowl of cirrus sockets surrounding central lumen. All cirri lost, except one with only 9 cirrals preserved ( Fig. 15D). The first cirral retained (probably c 2) compressed, L/W = 0.83. Following 8 cirrals longer than wide. The longest has L/W ratio of 2.3. Cirrals with concave aboral margins.

Arms 10, all broken. Thin, short spines sparsely distributed on proximal brachials. IBr 1 short, W = 2.1 mm, L = 0.56 mm, W/L = 3.8. Axillary (IBr 2) rhombic in shape, W = 2.5 mm, L = 2.6 mm, W/L = 0.96. IIBr 1 short, W = 2.0– 2.1 mm, L = 0.5– 0.6mm, W/L = 3.2–4.2. IIBr 2 cuneate, W = 2.2 mm, L = 1.9 mm, W/L = 1.2. First syzygy at IIBr 3 +4, W = 2.0 mm. Pinnules broken. The first pinnular of P 1 with L/W = 2.4.

MNHN-IE-2023-89. Centrodorsal conical in shape. D = 3.9 mm, H = 9.6 mm, H/D = 2.5. The aboral pole is conical in form. Cirrus sockets separated interradially by narrow flat strip ( Fig. 15B).

Cirri LVI (functional sockets). Cirri all lost. Functional cirrus sockets in three columns per radial area in centrodorsal. Each column with 3–5 functional sockets. Nine to thirteen obsolete sockets per radial area. Fulcral bowl of cirrus sockets surrounding central lumen.

Arms 10, all broken. Sparse and short spines on proximal brachials. IBr 1 short, W = 2.3 mm, L = 0.8 mm, W/L = 2.9. Axillary (IBr 2) rhombic in shape ( Fig. 15C), W = 2.8 mm, L = 3.1 mm, W/L = 0.9. IIBr 1 short, W = 2.2 mm, L = 0.68 mm, W/L = 3.2. IIBr 2 cuneate, W = 2.6 mm, L = 2.1 mm, W/L = 1.2. First syzygy at IIBr 3+ 4, W = 2.1–2.3 mm. Pinnules broken. The first pinnular of P 1 with L/W = 2.2.