Umimayanthus, Montenegro, Sinniger & Reimer, 2015

Montenegro, Javier, Fromont, Jane, Richards, Zoe, Kise, Hiroki, Gomez, Oliver, Hoeksema, Bert W. & Reimer, James Davis, 2024, Museum collections as untapped sources of undescribed diversity of sponge-zoantharian associations with the description of six new species of Umimayanthus (Zoantharia: Parazoanthidae) from Western Australia and eastern Indonesia, Contributions to Zoology 93 (5), pp. 466-522 : 512-513

Umimayanthus

This key is provided to aid field workers in identification of formally described Umimayanthus species, and is thus largely based on gross morphological attributes along with associated organisms and occa- sionally geography. More detailed identification can be made using supplementary table 1. This key should not be used as a basis to erect new species. 1. Associated with Ellisella sp.

octocoral – U. kanabou Fujii et al.,

2021. – Not associated with octocorals, but sponges .................................................. 2 2. Associated with Caribbean sponges ............................... U. parasiticus (Duchassaing & Michelotti, 1860) – Associated with Indo-Pacific sponges

.................................................................. 3

3. Associated with encrusting, cushionlike, or massive sponges .................... 4

– Associated with erect or flabellate sponges .................................................. 6

4. Polyps often organized in clusters of more than one ................... U. nakama Montenegro, Sinniger & Reimer, 2015

– Polyps not organized in clusters ..... 5

5. Associated with massive sponges, polyps often solitary .......... U. miyabi Montenegro, Sinniger & Reimer, 2015

– Association with encrusting or cushion- shape sponges, colonies often spread across neighboring sponges ............................. U. chanpuru Montenegro, Sinniger & Reimer, 2015

6. Up to 24 tentacles per polyp .............7

– More than 24 tentacles per polyp ..... .................................................................. 9

7. Colonies formed by chains of polyps extending in a reticulated pattern, on Raspailiidae sponges; in association with Trikentrion flabelliforme sponges .......................... U. cf. aruensis

– Colonies not formed by reticulated chains of polyps .................................. 8

8. Solitary polyps, with 10 to 12 capitulary ridges visible; associated with Biemnidae ; in association with Sigmaxinella soelae sponges ..................... ........................... U. lynherensis sp. nov.

– Polyps arranged in branching chains not interconnected. No capitulary ridges visible; associated with Microcionidae or Raspailiidae ; in association with Trikentrion flabelliforme and Clathria (Thalysias) cactiformis sponges ................. U. discolor sp. nov.

9. Associated with sponges in Bubaridae , colony often growing in the edges of the host sponge, polyp heights up to 16 mm, brown or white;

CONTRIBUTIONS TO ZOOLOGY 93 (2024) 466–522

in association with sponges in genus Phakelia ................. U. raksasa sp. nov.

– Associated with sponges in Raspailiidae ; yellow, white, cream or orange in color. ................................................ 10

10. Orange polyps, extending linearly, and with a poorly developed coenenchyma; in association with sponges in genus Endectyon ................................ ................................... U. jebarra sp. nov.

– Polyps of color other than orange ................................................... 11

11. Yellowish polyps, solitary and coenenchyma absent .................................. ........................... U. mirnangga sp. nov.

– White/cream polyps, extending in linear chains, and coenenchyma clearly visible; in association with Endectyon (Endectyon) fruticosum and E. (Endectyon) thurstoni sponges ............................ U. wunanggu sp. nov.