Some thecate hydroids (Cnidaria: Hydrozoa) from off New Caledonia collected during KANACONO and KANADEEP expeditions of the French Tropical Deep-Sea Benthos Program Author Galea, Horia R. Author Schuchert, Peter text European Journal of Taxonomy 2019 2019-10-04 562 1 70 journal article 25305 10.5852/ejt.2019.562 f6af87ae-7f5c-482a-8437-cba6bdcf88f5 3474305 6567F621-7A92-4D1A-8902-A1E76325AF94 Sertularella helenae Vervoort, 1993 Sertularella helenae Vervoort, 1993: 218 , fig. 47B–E. Sertularella helenae Galea 2016: 27 , fig. 8H. Material examined PACIFIC OCEAN three colonies, 1.8× 2.5 cm , 3.4× 2.5 cm , and 2.8× 2.4 cm , respectively, all without gonothecae; off New Caledonia , stn DW4764; 23°20′ S , 168°15′ E ; 350–356 m ; 27 Aug. 2016 ; KANACONO leg.; one colony fragment was used for DNA extraction, DNA 1377; voucher MHNG-INVE- 120838 ; MNHN-IK-2015-409 four colonies, 1.5 × 0.9 cm , 2.1× 1.2 cm , 2.5 × 2.2 cm , and 3.8× 1.7 cm , respectively, without gonothecae; off New Caledonia , stn DW4744; 22°55′ S , 167°37′ E ; 310– 290 m ; 23 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-410 a colony, 3× 4 cm , composed of three stems whose branches anastomose so as to form a single flabellate colony, without gonothecae; off New Caledonia , stn DW4720; 22°50′ S , 167°11′ E ; 374–400 m ; 19 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-411 three colonies, 1.3× 1.5 cm , 2.1× 1.7 cm , and 2.5 × 2.2 cm , respectively, without gonothecae; off New Caledonia , stn DW4783; 22°56′ S , 167°48′ E ; 385–395 m ; 29 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-412 two colonies, 2.5× 2 cm and 1.8× 1.5 cm , respectively, without gonothecae; off New Caledonia , stn DW4725; 22°41′ S , 167°05′ E ; 240–256 m ; 20 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-413 a colony, 3× 2.8 cm , without gonothecae; off New Caledonia , stn DW4731; 22°31′ S , 167°35′ E ; 460– 457 m ; 22 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-414 nine colonies without gonothecae, largest 3× 3.2 cm ; off New Caledonia , stn CP4658; 22°42′ S , 167°13′ E ; 303–315 m ; 10 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-415 three colonies without gonothecae, 1.3× 1.5 cm , 1.5× 1.6 cm , and 2.5 × 2.5 cm , respectively; off New Caledonia , stn DW4743; 22°52′ S , 167°34′ E ; 380– 340 m ; 23 Aug. 2016 ; KANACONO leg.; MNHN- IK-2015-416 numerous colonies and fragments, all without gonothecae, largest 3 × 3 cm ; off New Caledonia , stn DW4651; 22°42′ S , 167°14′ E ; 295–300 m ; 09 Aug. 2016 ; KANACONO leg.; one colony was used for DNA extraction, DNA 1378; voucher MHNG-INVE- 120839 ; barcode identification MK 073097 ; MNHN-IK-2015-417 a 2.5× 2.5 cm , colony without gonothecae; off New Caledonia , stn CP4675; 22°50′ S , 167°30′ E ; 350–366 m ; 13 Aug. 2016 ; KANACONO leg.; whole colony used for DNA extraction, DNA1379; barcode identification MK 073098 ; MHNG-INVE- 120840 two colonies without gonothecae, 3.5× 4 cm and 4.5× 4 cm , respectively; off New Caledonia , stn DW4744; 22°55′ S , 167°37′ E ; 310– 290 m ; 23 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-440 two colonies without gonothecae, both 2.5× 3 cm ; off New Caledonia , stn DW4782; 23°00′ S , 167°55′ E ; 856– 845 m ; 29 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-441 four colonies without gonothecae, 3.2 × 3 cm , 3.5× 3 cm , 3.5× 3.5 cm , and 4.2× 4.5 cm , respectively; off New Caledonia , stn DW4741; 22°52′ S , 167°41′ E ; 210 m ; 23 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-442 a 3.5× 3 cm colony without gonothecae; off New Caledonia , stn DW4745; 22°57′ S , 167°39′ E ; 310–403 m ; 23 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-443 two colonies without gonothecae, 4× 4 cm and 4.5× 4.5 cm , respectively; off New Caledonia , stn DW4781; 22°57′ S , 167°47′ E ; 295– 255 m ; 29 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-444 twenty colonies without gonothecae, largest 6 × 6 cm ; off New Caledonia , stn DW4743; 22°52′ S , 167°34′ E ; 380– 340 m ; 23 Aug. 2016 ; KANACONO leg.; MNHN-IK-2015-445 . Remarks Colonies of reticulate appearance, formed through anastomoses of terminal tendrils on neighboring branchlets, are met with in material MNHN-IK-2015-440. Tendrils may also settle down on main stems, forming accessory tubes. Abortive branchlets, given off from below the hydrothecal bases, may never develop hydrothecate internodes, transforming directly into tendrils that reach other hydrothecal bases, uniting laterally neighboring side branches, as illustrated by material MNHN-IK-2015-409. Despite the abundance of the material available both earlier ( Vervoort 1993 ) and in the present collections, the gonothecae of this species have yet to be discovered. Distribution New Caledonia , Norfolk Ridge and Solomon Islands ( Galea 2016 ).