Newhousia yhaga C.W.Vieira, De Clerck et Payri, 2016

Vieira, Christophe, De Clerck, Olivier & Payri, Claude E., 2016, First report of the Hawaiian genus Newhousia (Dictyotales, Phaeophyceae) from Madang, Papua New Guinea and description of the new species N. yhaga sp. nov., Botanica Marina (Warsaw, Poland) 59 (1), pp. 31-37 : 34-35

publication ID

https://doi.org/ 10.1515/bot-2015-0095

DOI

https://doi.org/10.5281/zenodo.11354182

persistent identifier

https://treatment.plazi.org/id/03C5854F-FF92-722D-BDD8-F944FDB1CB3E

treatment provided by

Felipe

scientific name

Newhousia yhaga C.W.Vieira, De Clerck et Payri
status

sp. nov.

Newhousia yhaga C.W.Vieira, De Clerck et Payri sp. nov.

( Figure 2A–O View Figure 2 ).

Description

Thalli tightly adherent to and following the contours of dead-coral substrata ( Figure 2A, B View Figure 2 ), fronds ovoid to irregularly lobed in surface outline ( Figure 2C–E View Figure 2 ), to 3–4 mm in diameter, green khaki-gray ( Figure 2A, B, D View Figure 2 ) or reddishbrown ( Figure 2C View Figure 2 ) in color, consisting of multiple layers of imbricated, marginally meristematic encrusting blades ( Figure 2F, G View Figure 2 ) cemented to the substratum and to each other ( Figure 2C View Figure 2 ) across the whole of the undersurfaces and without anchoring rhizoids; stack of blades to 1 mm thick. Blades extend peripherally from a continuous marginal meristem ( Figure 3E, H–J View Figure 3 ), 45.7±5.1 µm thick, bilayered, cells of the epidermal and hypodermal layers 11.3±2.4 µm and 34.3±3.9 µm thick respectively. Epidermal cells rectilinear in surface ( Figure 2H–K View Figure 2 ), cross-sectional ( Figure 2N View Figure 2 ). Hypodermal cells cuboidal in cross-section ( Figure 2N View Figure 2 ), rectilinear or in long section ( Figure 2O View Figure 2 ), 32.3±3.2 µm in width by 59.7±3.9 µm in length. Juvenile hairs ( Figure 2L, M View Figure 2 ) clustered. Oogonia, antheridia and sporangia unknown. Differing from N. imbricata by (1) the distinctive radial development of surface blades from points of origin and (2) the 4% difference in rbc L nucleotide sequences [PC0063019 ( IRD 11128) and IRD 11129].

Ethymology

The epithet “yhaga ” comes from the word “Yhag”, which is the general name for brown algae in Bel language that is spoken by the villages surrounding Madang Lagoon and in other areas in Madang province.

Holotype

PC0063019 ( IRD11128 ), leg. C. Payri (13.xi.2012). Figure 2A, B View Figure 2 .

Type locality

Paeowa Island , Madang Lagoon, Papua New Guinea (05.1745° S; 145.833° E), thalli on dead coral at - 10 m. GoogleMaps

Distribution

Endemic so far to the northeastern shore of Papua New Guinea ( Figure 1 View Figure 1 ).

Habitat

Thalli consisting of multiple layers of tightly adhering crusts several cm 2 in surface area and cemented to hard substrata, intermixed with encrusting coralline algae ( Figure 2B, D View Figure 2 ) at upper levels of inner and outer reef slopes from low intertidal to depths of 10 m in areas of strong to moderate water movement.

Specimens examined

1) Paeowa Island ( PCT29 ; 5.1745° S; 145.833° E), (C. Payri, 13.xi.2012; IRD11128 ). GoogleMaps Malamal Anchorage, Madang, Papua New Guinea ( PCT12 ; - 5.11995° S; 145.823° E), Madang, Papua New Guinea, 18 November 2012, leg. C. Payri (C. Payri, 18.xi.2012; IRD11129 ). GoogleMaps

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF