Kotatea niwa, Kessel & Alderslade & Bilewitch & Schnabel & Norman & Potts & Gardner, 2022

Kessel, Gustav M., Alderslade, Philip, Bilewitch, Jaret P., Schnabel, Kareen E., Norman, Jerry, Potts, Romana Tekaharoa & Gardner, Jonathan P. A., 2022, Dead man’s fingers point to new taxa: two new genera of New Zealand soft corals (Anthozoa, Octocorallia) and a revision of Alcyonium aurantiacum Quoy & Gaimard, 1833, European Journal of Taxonomy 837, pp. 1-85 : 40-43

publication ID	https://doi.org/ 10.5852/ejt.2022.837.1923
publication LSID	lsid:zoobank.org:pub:7CBAC71F-FF75-411C-9CE9-AA633E16438E
DOI	https://doi.org/10.5281/zenodo.7094114
persistent identifier	https://treatment.plazi.org/id/21F82707-8C02-4C9E-A4B0-5672E5666601
taxon LSID	lsid:zoobank.org:act:21F82707-8C02-4C9E-A4B0-5672E5666601
treatment provided by	Felipe
scientific name	Kotatea niwa
status	gen. et sp. nov.

Treatment

Kotatea niwa gen. et sp. nov.

urn:lsid:zoobank.org:act:21F82707-8C02-4C9E-A4B0-5672E5666601

Figs 1A–B View Fig , 2G View Fig , 14B View Fig , 22–23 View Fig View Fig

Diagnosis

Colonies robustly lobate, orange with small red spots, and with white polyps. Collaret and points may be colourless or dark orange to red, and consist of warty, mostly flattened spindles and thorny clubs. Tentacles contain irregular, warty, scale-like sclerites. Polyp neck contains abundant warty rod-like forms. Polyp mounds contain similar sclerites and thorny clubs. Lobe surface contains thorny clubs and warty double-heads. Base surface contains warty radiates grading into double-heads, a few spheroids and tends to lack clubs. Lobe and base interior contains oval or rod-like forms girdled with warts, and highly sculptured spheroids and double-heads.

Etymology

The species is named for NIWA, the National Institute of Water and Atmospheric Research in New Zealand, where the research described herein was conducted.

Material examined

Holotype NEW ZEALAND • Northland, Piwhane / Spirits Bay ; 34.4167° S, 172.7833° E; depth 17–20 m; Apr. 1999; J. Starmer leg.; MAGNT C015226 View Materials . GoogleMaps

Paratype NEW ZEALAND • 2 specimens; Manawatāwhi / Three Kings Islands, ~ 1 km NE of Moekawa / South West Island; 34.1667° S, 172.0833° E; depth 17 m; 20 Apr. 1999; J. Starmer leg.; MAGNT C015224 View Materials GoogleMaps .

Additional material

NEW ZEALAND • 5 specimens; Northland, Bay of Islands , ~ 1 km NW of Okahu Island; 35.1917° S, 174.1922° E; depth 37–40 m; 3 Sep. 2009; Oceans Survey 2020 exped.; stn KAH0907 /194; NIWA 58543 View Materials GoogleMaps .

Description (holotype MAGNT C015226)

Colony form

The holotype is a lobate colony, measuring 1.5 cm in height by 2.5 cm width ( Fig. 14B View Fig ). The surface of the colony (ethanol-preserved) is orange with small red spots, which are produced by red polyp neck and mound sclerites. Polyps occur all over the colony’s surface but are sparser towards its base and absent from the very short basal section. Polyps are white, 0.5–0.75 mm tall when expanded, with colourless collaret and points ( Fig. 2G View Fig ), but see variability section below.

Sclerites

Points are composed of warty spindles (~ 0.15–0.25 mm long), most of which are flattened, and thorny clubs distally (~ 0.08–0.22 mm long) ( Fig. 22A–B View Fig ). Proximally, the spindles become larger, more robust, and more crescentic (~ 0.2–0.38 mm long), transitioning into a transverse orientation and merging with the collaret ( Fig. 22A View Fig ). The number of collaret rows is variable depending on polyp size, but in large polyps this is approximately seven rows ( Fig. 23C View Fig ). The tentacles contain irregular, warty, scale-like forms, often slightly crescentic (~ 0.05–0.18 mm long) ( Fig. 22C View Fig ). The polyp neck contains abundant warty rod-like forms (~ 0.08–0.1 mm long) ( Fig. 22D View Fig ), which extend into the polyp mound, where they gradually give way to thorny clubs (~ 0.06–0.15 mm long) ( Fig. 22E View Fig ). The surface of the lobes between polyp mounds contains a mixture of thorny clubs and warty double-heads (~ 0.08–0.15 mm long) ( Fig. 22F View Fig ). The surface of the base contains warty radiates grading into double-heads, and a few spheroids but tends to lack clubs ( Fig. 23A View Fig ). The interior of both the lobes and the base contains highly sculptured spheroids and double-heads, as well as some oval or rod-like forms girdled with warts, all of which are usually larger than the sclerites of the surface regions (~ 0.12–0.2 mm long) ( Figs 22G View Fig , 23B View Fig ).

Variability

Both the paratype and NIWA 58543 possess collaret and point sclerites which are coloured dark orange to red (colourless in holotype) in their smaller polyps. All three preserved lots are otherwise very similar in colony colour and growth form ( Fig. 14B View Fig ), and the paratype and NIWA 58543 correspond very closely to the holotype in terms of sclerite composition and size ranges ( Figs 22–23 View Fig View Fig ).

Comparisons

Kotatea niwa gen. et sp. nov. is most similar to K. kurakootingotingo gen. et sp. nov. and K. lobata gen. et sp. nov., which share its robust, lobate growth form. Differences from these species are discussed under their respective accounts above.

Habitat and distribution

Specimens of Kotatea niwa gen. et sp. nov. were collected from the Manawatāwhi/Three Kings Islands, Piwhane/Spirits Bay and the Bay of Islands at depths between 17 and 40 m ( Fig. 1A–B View Fig ).