Two new genera and nine new species of hydroids (Cnidaria: Hydrozoa) from off New Caledonia Author Galea, Horia R. text European Journal of Taxonomy 2015 2015-08-31 135 1 19 journal article 22396 10.5852/ejt.2015.135 4ebe05f4-f39b-4770-85c2-8de0fcda0cb3 2118-9773 3785289 F5F578C8-4CA7-4ADA-9DAF-0DA5170E9F9F Genus Hincksella Billard, 1918 Key to species The following key comprises all species currently included in the genus Hincksella . 1. Colonies pinnate ……………………………………………………………………………………2 – Colonies with simple stems …………………………………………………………………………5 2. Hydrothecae shallow …………………………………………………… H. sibogae Billard, 1918 – Hydrothecae deep …………………………………………………………………………………3 3. Hydrotheca adnate for one-third ……………………………………… H. formosa (Fewkes, 1881) – Hydrotheca adnate for half its length ……………………………………………………………4 4. Free part facing outward …………………………………………… H. alternans ( Allman, 1888 ) – Free part facing upward ………………………………………………… H. indiana Millard, 1967 5. Perisarc of hydrotheca finely and densely striated …………………………………………………6 – Perisarc of hydrotheca smooth or wrinkled ………………………………………………………7 6. Hydrotheca making an almost right angle with the stem ……………………… H. similis sp. nov. – Hydrotheca making an acute angle with the stem …………………… H. neocaledonica sp. nov. 7. Perisarc of hydrotheca wrinkled ……………………………………… H. corrugata Millard, 1958 – Perisarc of hydrotheca smooth ……………………………………………………………………8 8. Hydrotheca exceedingly long …………………………………………… H. pusilla Ritchie, 1910 – Hydrotheca moderately long ………………………………………………………………………9 9. Aperture of hydrotheca facing outward ……………………………………… H. cornuta sp. nov. – Aperture of hydrotheca facing upward …………………………………………………………10 10. Hydrotheca isodiametric throughout ………………………………… H. projecta ( Fraser, 1938 ) – Margin of hydrotheca distinctly flaring ……………………………… H. rigida ( Fraser, 1938 )