RHODOPHYTA

Tsuda, Roy T. & Giuseffi, Usa. Louise, 2015, Marine Benthic Algae from Seamounts along the Mariana Islands, Western Pacific, Micronesica 2015 (4), pp. 1-19 : 6-9

PHYLUM RHODOPHYTA

Class Florideophyceae ORDER NEMALIALES FAMILY LIAGORACEAE Ganonema farinosum (J.V. Lamouroux) K. C. Fan & Yung C. Wang ; Abbott 1999: 77, figs. 11A‒ G. Specimens examined. TATSUMI REEF: TAT-01-03 (BISH 722642).

ORDER BONNEMAISONIALES

FAMILY BONNEMAISONIACEAE

Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon ; Abbott 1999: 174, figs. 43C‒D.

Specimens on slide are a mixture of Polysiphonia spp. and the sporophyte phase of Asparagopsis taxiformis characterized by three pericentral cells.

Specimens examined. STINGRAY SHOALS: STI-02-03 (BISH 720885).

ORDER CORALLINALES

FAMILY CORALLINACEAE

* Jania pumila J. V. Lamouroux ; N’Yeurt & Payri 2010: 56, fig. 98.

Decalcified specimens are 52‒88 µm diam.

Specimens examined. PATHFINDER REEF: PAT-01-03 (BISH 722371), PAT-02-05 (BISH 743263). ARAKANE REEF. ARA-01-05 (BISH 763246), ARA-02-05 (BISH 763289). TATSUMI REEF: TAT-01-03 (BISH 722643).

* Jania rubens J. V. Lamouroux ; Taylor 1950: 133.

The specimen is 3 mm long and up to 60 µm diam with terminal tips distinctly acute.

Specimens examined. PATHFINDER REEF: PAT-01-05 (BISH 743241).

ORDER PEYSSONNELIALES

FAMILY PEYSSONNELIACEAE

Peyssonnelia sp.

The collection consists of two small blades (1 cm diam). The dorsal surface shows lines of round cells (ca. 8 µm diam) in parallel rows from the apical margin. Branched unicellular rhizoids arise from the ventral basal sector of the thin crust.

Specimens examined. PATHFINDER REEF: PAT-02-03 (BISH 722385).

ORDER GIGARTINALES

FAMILY CAULACANTHACEAE

* Caulacanthus ustulatus (Turner) Kützing ; Abbott 1999: 104, figs. 20D˗F.

Morphology of specimen is similar to Hypnea spinella ; however, this specimen possesses polygonal cortical cells, 6‒12 µm diam.

Specimens examined. ARAKANE REEF. ARA-02-05 (BISH 763283).

FAMILY CYSTOCLONIACEAE

Hypnea spinella (C. Agardh) Kützing ; Abbott 1999: 117, figs. 25B‒E.

Specimens are 240‒320 µm diam and possess slightly elongated cortical cells.

Specimens examined. ZEALANDIA BANK: ZEA-01-03 (BISH 722343 on a Halimeda segment). PATHFINDER REEF: PAT-01-03 (BISH 722370), PAT-02-03 (BISH 722383), PAT-02-05 (BISH 743268). ARAKANE REEF: ARA-01-03 (BISH 722390), ARA-02-03 (BISH 722418).

ORDER RHODYMENIALES

FAMILY CHAMPIACEAE

Champia parvula (C. Agardh) Harvey ; Skelton & South 2007: 68, figs. 126‒133.

Specimens examined. PATHFINDER REEF: PAT-02-03 (BISH 722387).

FAMILY LOMENTARIACEAE * Lomentaria hakodatensis Yendo ; Abbott 1999: 224, figs. 62A‒D.

Specimens examined. ZEALANDIA BANK: ZEA-02-05 (BISH 743238). PATHFINDER REEF: PAT-01-03 (BISH 722373), PAT-02-03 (BISH 722381). ARAKANE REEF: ARA-01-03 (BISH 722393), ARA-02-03 (BISH 722406).

ORDER CERAMIALES

FAMILY CERAMIACEAE

** Antithamnion decipiens (J. Agardh) Athanasiadis ; Abbott 1999: 250, figs. 69C‒D.

Specimens examined. ARAKANE REEF: ARA-01-03 (BISH 722397).

Antithamnionella breviramosa (E. Y. Dawson) E. M. Wollaston ; Skelton & South 2007: 86, figs. 181‒185.

Specimens examined. ZEALANDIA BANK: ZEA-02-03 (BISH 722352). PATHFINDER REEF: PAT-01-03 (BISH 722360).

Antithamnionella graeffei (Grunow) Athanasiadis ; Skelton & South 2007: 87, figs. 186‒188.

Specimens examined. STINGRAY SHOALS: STI-02-03 (BISH 720884 on Chondria sp. fragment).

* Ceramium affine Setchell & N. L. Gardner ; South & Skelton 2000: 54, figs. 1‒10.

Specimens examined. PATHFINDER REEF: PAT-02-03 (BISH 722380). ARAKANE REEF: ARA-02-03 (BISH 722412).

* Ceramium codii (H. Richards) Mazoyer ; Cho & Fredericq 2006: 496, figs. 24‒55.

Specimens examined. TATSUMI REEF: TAT-01-03 (BISH 722644 on Ganonema farinosum ).

** Ceramium isogonum Harvey ; Skelton & South 2007: 98, figs. 240‒245.

Filaments are up to 120 µm diam, with slightly elongated vertical cells formed acropetally and basipetally at node, and with forcipate apices. Tetrasporangia lack involucres and divide tetrahedrally.

Specimens examined. ARAKANE REEF: ARA-01-03 (BISH 722398).

Ceramium macilentum J. Agardh ; South & Skelton 2000: 71, figs. 52‒62; Skelton & South 2007: 103, figs. 246‒250.

Specimens possess 6 periaxial cells which produce cells acropetally at node. The specimens are 60‒74 µm diam which is less than half the diameter reported by Skelton & South (2007). Apices are distinctly forcipate or circinate.

Specimens examined. STINGRAY SHOALS: STI-02-03 (BISH 720886 on Chondria sp. fragment). ZEALANDIA BANK: ZEA-02-05 (BISH 743236, fragment). ARAKANE REEF: ARA-02-05 (BISH 763275).

Corallophila kleiwegii Weber-van Bosse; N’Yeurt & Payri 2010: 114, fig. 227.

[= Corallophila apiculata (Yamada) R. Norris ]

Specimens examined. ZEALANDIA BANK: ZEA-01-03 (BISH 722341). PATHFINDER REEF: PAT-01-03 (BISH 722366), PAT-01-05 (BISH 743240), PAT-02-05 (BISH 743271).

** Gayliella transversalis (Collins & Hervey) T. O. Cho & Fredericq ; Cho & Fredericq 2006: 727, figs. 5a‒n; N’Yeurt & Payri 2010: 117, figs. 228 and 229.

We follow N’Yeurt & Payri (2010) in using G. transversalis instead of G. flaccida (Kützing) T. O. Cho & L. McIvor for the Pacific specimens.

Specimens examined. ZEALANDIA BANK: ZEA-01-03 (BISH 722339).

FAMILY DASYACEAE

* Dasya cf. corymbifera J. Agardh ; Abbott 1999: 320, figs. 90A‒C.

Specimens are 5‒13 mm long and appear to fall within the circumscription of D. corymbifera .

Specimens examined. ZEALANDIA BANK: ZEA-01-03 (BISH 722342). PATHFINDER REEF: PAT-02-05 (BISH 743265).

Dasya iyengarii Børgesen ; N’Yeurt & Payri 2010: 127, figs. 258‒261.

Non-corticated specimens possess prominent round basal cell in side branches and terminal incurved tips.

Specimens examined. ZEALANDIA BANK: ZEA-02-03 (BISH 722353). PATHFINDER REEF: PAT-01-03 (BISH 722361), PAT-02-03 (BISH 722377), PAT-01-05 (BISH 743242), PAT-02-05 (BISH 743266). ARAKANE REEF: ARA-01-03 (BISH 722395), ARA-02-03 (BISH 722408), ARA-01-05 (BISH 763245), ARA-02-05 (BISH 763266, 763274, 763285).

FAMILY RHODOMELACEAE

Chondria polyrhiza Collins & Hervey ; Abbott 1999: 360, figs. 103G‒H.

Specimens examined. SUPPLY REEF: SUP-01-03 (BISH 720896). ZEALANDIA BANK: ZEA-02-03 (BISH 722354). PATHFINDER REEF: PAT-01-03 (BISH 722368), PAT-02-03 (BISH 722375). ARAKANE REEF: ARA-01-03 (BISH 722391).

** Chondria bullata N’Yeurt & Payri, N’Yeurt & Payri 2010: 140 , figs. 292‒294.

Specimens examined. STINGRAY SHOALS: STI-01-03 (BISH 723219), STI-02-03 (BISH 720887). PATHFINDER REEF: PAT-01-03 (BISH 722364).

* Chondria simpliciuscula Weber-van Bosse; N’Yeurt & Payri 2010: 143, fig. 304.

Specimens examined. PATHFINDER REEF: PAT-01-05 (BISH 743256). ARAKANE REEF: ARA-01-03 (BISH 722399), ARA-02-03 (BISH 722417), ARA-02-05 (BISH 763267, 763272, 763288).

Leveillea jungermannioides (Hering & Martens) Harvey ; Abbott 1999: 396, figs. 116A‒D.

Specimens examined. PATHFINDER REEF: PAT-01-05 (BISH 743250).

* Polysiphonia dotyi Hollenberg ; Hollenberg 1968b: 198, figs. 1A, 1B, 4 and 5.

Pericentral cells (> 7) which appear swollen are arranged in offset positions in successive segments. Rhizoids are attached to pericentral cell in open connection.

Specimens examined. ARAKANE REEF. ARA-01-05 (BISH 763260 on Halimeda opuntia ).

Polysiphonia homoia Setchell & N. L. Gardner ; Hollenberg 1968b: 201, fig. 2B.

Specimens examined. STINGRAY SHOALS: STI-02-03 (BISH 719820).

* Polysiphonia sertularioides (Grateloup) J. Agardh ; Abbott 1999: 414, figs. 121A‒D as Polysiphonia flaccidissima Hollenberg.

[= Neosiphonia flaccidissima (Hollenberg) M. S. Kim & I. K. Lee ]

Specimens examined. ZEALANDIA BANK: ZEA-01-03 (BISH 722344). ARAKANE REEF: ARA-01-03 (BISH 722394), ARA-02-03 (BISH 722409).

Polysiphonia upolensis (Grunow) Hollenberg ; Hollenberg 1968a: 94, figs. 6D, 6E, 29, 35, 42.

Specimens are 15 mm long with erect branches 100 µm diam at mid-height. Thallus possesses four pericentral cells and unicellular rhizoids are cut from pericentral cells.

Specimens examined. ZEALANDIA BANK: ZEA-02-05 (BISH 743237). PATHFINDER REEF: PAT-01-05 (BISH 743245).

Polysiphonia sp.

The entire collection is preserved on three slides. Prostrate branches are 80‒120 µm diam and possess 4‒7 pericentral cells with each pericentral cell about 16‒25 µm wide and 1‒2 times long. Erect branches, up to 2 mm high and 90 µm diam, are usually unbranched and at times possess only a single branch. The erect branches appear to possess 4 or 5 pericentral cells. Trichoblasts are rudimentary; however, scar cells are large, 16‒20 µm diam, and arranged spirally similar to the tetrasporangia. Rhizoids are up to 112 µm long, cut from pericentral cell and form digitate tips. Gametophytic materials need to be examined before the specimens can be considered a new species.

Specimens examined. ZEALANDIA BANK: ZEA-01-03 (BISH 722346). PATHFINDER REEF: PAT-01-03 (BISH 722367).

FAMILY WRANGELIACEAE

Anotrichium tenue (C. Agardh) Nägeli ; Abbott 1999: 247, fig. 68D.

Specimens are 100˗120 (160) µm diam.

Specimens examined. PATHFINDER REEF: PAT-01-03 (BISH 722372), PAT-02-03 (BISH 722382).