Symplectoscyphus commensalis Vervoort, 1993

Galea, Horia R. & Schuchert, Peter, 2019, Some thecate hydroids (Cnidaria: Hydrozoa) from off New Caledonia collected during KANACONO and KANADEEP expeditions of the French Tropical Deep-Sea Benthos Program, European Journal of Taxonomy 562, pp. 1-70 : 48

Symplectoscyphus commensalis Vervoort, 1993

Fig. 17 F–G

Symplectoscyphus commensalis Vervoort, 1993: 247 , figs 56C–F, 57, 58A–E.

Material examined

PACIFIC OCEAN • female colony with stems up to 1 cm high on stem of sertulariid hydroid; off New Caledonia, stn DW4670; 22°58′ S, 167°24′ E; 680– 612 m; 12 Aug. 2016; KANACONO leg.; one stem was used for DNA extraction, DNA 1389; voucher MHNG-INVE- 120850; barcode identifier MK 073103 ; MNHN-IK-2015-399 .

Remarks

A small species, with minute hydrothecae resembling those of S. ralphae Vervoort, 1993 through their shape and size (compare Fig. 17F with Galea 2016: fig 10Q–T). Unlike S. commensalis that forms irregularly-branched colonies (up to 2 nd order branches observed), the latter builds regularly-pinnate colonies. In addition, their respective gonothecae are different [compare Fig. 17G with Galea 2016: fig. 10U–V).

Distribution

Only known from off New Caledonia ( Vervoort 1993; present study).

Figures

Fig. 17. A–E.? Symplectoscyphus acutustriatus Galea, sp. nov., portion of stem with side branch (A, from sample MNHN-IK-2015-460); hydrothecae without (B) and with (C) internal, submarginal cusps, aperture in apical view (D), portion of colony with gonotheca (E), all from sample MNHN- IK-2015-461. — F–G. Symplectoscyphus commensalis Vervoort, 1993, portion of colony with internodes and hydrothecae (F), gonotheca(G), both from sampleMNHN-IK-2015-399.— H–J.? Symplectoscyphus elongatulus Galea, sp. nov., portion of stem with proximal part of cladium (H), hydrotheca (I), apical view of aperture showing submarginal, intrathecal cusps (J), all from sample MNHN-IK-2015-463. — K–M. Symplectoscyphus paulensis Stechow, 1923, colony fragment (K), hydrotheca (L), gonotheca (M), all from sample MNHN-IK-2015-393. — N–O. Symplectoscyphus cf. tropicus (Hartlaub, 1901), portion of colony (N), hydrotheca (O), both from sample MNHN-IK-2015-394. Scale bars: A, H, K, N = 1 mm; B–C, E–G, I, L–M, O = 500 µm; D, J = 100 µm.