Solenoscyphus decidualis Galea, 2015

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 : 11

publication ID	https://doi.org/10.5852/ejt.2019.562
publication LSID	lsid:zoobank.org:pub:6567F621-7A92-4D1A-8902-A1E76325AF94
DOI	https://doi.org/10.5281/zenodo.3475287
persistent identifier	https://treatment.plazi.org/id/03C0D256-AD44-6129-FDFE-A6DF588AF94A
treatment provided by	Plazi
scientific name	Solenoscyphus decidualis Galea, 2015
status

Treatment

? Solenoscyphus decidualis Galea, 2015 View in CoL

Solenoscyphus decidualis Galea, 2015a: 9 View in CoL View Cited Treatment , figs 3B, 4C–D.

Material examined

PACIFIC OCEAN • a 5.7 cm high colony and the 1.1 cm long tip of a second colony, both without gonothecae; off New Caledonia, stn DW4715; 22°50′ S, 167°27′ E; 424 m; 18 Aug. 2016; KANACONO leg.; one cladium from the largest colony was used for DNA extraction, DNA1354; voucher MHNG-INVE- 120788; barcode identifier MK 073084 View Materials ; MNHN-IK-2015-375 GoogleMaps • a colony without gonothecae, 6.8 cm high; off New Caledonia, stn CP4676; 22°51′ S, 167°30′ E, 383 m; 13 Aug. 2016; KANACONO leg.; a basal cladium was cut off and used for DNA extraction, DNA1355; voucher MHNG-INVE- 120789; barcode identifier MK 073085 View Materials ; MNHN-IK-2015-376 GoogleMaps .

Remarks

The present material, forming pinnate colonies with lightly fascicled stems and long, tubular, weakly adnate hydrothecae, is in full agreement with the holotype described earlier by Galea (2015a). The perisarc of the colony (including that of the hydrothecae) is uniformly smooth, and the hydrothecal rim is thickened distally for only a very short distance (ca 40 µm) just below the aperture.

Despite forming regularly-pinnate colonies provided with tubular hydrothecae possessing rounded, deciduous opercula, the present species and S. candelabrum may prove to not be congeneric. The available 16S sequences place this species clearly outside the clades of Solenoscyphus and Staurothecidae ( Fig. 20 View Fig and ‘Molecular study’ section), but without any supported relationships to other taxa. This makes it likely that this species does not belong to the genus Solenoscyphus . However, the available 16S data do not resolve sufficiently well the family relationships, and additional markers are needed for this purpose. Therefore, and also because no diagnostic traits are evident, we decided to leave it in the genus Solenoscyphus until a more detailed study allows firmer conclusions.

Distribution

Only known from off New Caledonia ( Galea 2015a; present study).