Bicaularia tongensis ( Stechow, 1919b )

Calder, Dale R. & Faucci, Anuschka, 2021, Shallow water hydroids (Cnidaria, Hydrozoa) from the 2002 NOWRAMP cruise to the Northwestern Hawaiian Islands, Zootaxa 5085 (1), pp. 1-73 : 36-37

Bicaularia tongensis ( Stechow, 1919b)

Fig. 10g

Sertularella tongensis Stechow, 1919b: 89 , figs F 1, G 1.— Coles et al., 2002a: 318.— Carlton & Eldredge, 2009: 38.

Bicaularia tongensis .— Calder, 2020: 217, fig. 5c, d.

Type locality. Kingdom of Tonga: Tonga Islands ( Stechow 1919b) .

Voucher material. Midway Atoll, on a bryozoan, 23.ix.2002, one colony, 3.5 mm high, without gonothecae, coll. A. Faucci, ROMIZ B5445 .— Laysan Island , on Halimeda sp. , 17.ix.2002, one colony, 5 mm high, with gonothecae, coll. A. Faucci, ROMIZ B5446 .

Remarks. A taxonomic account of Bicaularia tongensis ( Stechow, 1919b) in Hawaii has been given earlier ( Calder 2020). New records of the species from the region are added here from Midway Atoll and Laysan Island.

A thorough account of this species, accompanied by a synonymy list, has been provided by Song (2019) and Song et al. (2019).

Reported Distribution. Hawaiian archipelago. Oahu: Kaneohe Bay, Moku Manu Island ( Coles et al. 2002a, as Sertularella tongensis ; Calder 2020).

Elsewhere. Indo-Pacific; Caribbean Sea; Mediterranean Sea ( Song et al. 2019). If Sertularella exilis Fraser, 1938 is conspecific, the species also occurs in the eastern Pacific ( Fraser 1938, 1948).

Figures

FIGURE 10. Sertulariidae and Symplectoscyphidae. a, Tridentata loculosa (Bale, 1852), part of hydrocaulus with two hydrothecal pairs, Midway Atoll, ROMIZ B5434. Scale equals 0.2 mm. b, Tridentata loculosa (Bale, 1852), gonotheca, Midway Atoll, ROMIZ B5434. Scale equals 0.2 mm. c, Tridentata orthogonalis (Gibbons & Ryland, 1989), part of hydrocaulus with two hydrothecal pairs, Laysan Island, ROMIZ B5440. Scale equals 0.2 mm. d, Tridentata rugosissima (Thornely, 1904), part of hydrocaulus with one hydrothecal pair, Laysan Island, ROMIZ B5489. Scale equals 0.1 mm. e, Tridentata turbinata (Lamouroux, 1816), part of hydrocaulus with two hydrothecal pairs, Pearl & Hermes Atoll, ROMIZ B5444. Scale equals 0.1 mm. f, Tridentata turbinata (Lamouroux, 1816), gonotheca, Pearl & Hermes Atoll, ROMIZ B5444. Scale equals 0.2 mm. g, Bicaularia tongensis (Stechow, 1919b), part of hydrocaulus with two hydrothecae, Midway Atoll, ROMIZ B5445. Scale equals 0.1 mm.