Treijathana paulayi, Asami and Yamaguchi, 2001

Achituv, Yair & Langsam, Yaacov, 2005, Coral-inhabiting barnacles (Cirripedia; Thoracica; Balanomorpha; Pyrgomatinae) from east of 150 ° W, Journal of Natural History (J. Nat. Hist.) 39 (20), pp. 1705-1717 : 1708

TreIJathana paulayi Asami and Yamaguchi, 2001

( Figure 3 )

Synonymy

Treυathana paulayi Asami and Yamaguchi 2001 , p 20, Figures 1–3 .

Material examined

Sample lost after examination and description, from Acanthastraea sp. MNHN-Scle 20283 (field number GAM 94 c; [ T IX, p 1691]). Two specimens; shells and opercular valves. French Polynesia; Gambier Islands; Aukena Island; 23 ° 07 9 S, 134 ° 54 9 W; Tauna reef, depth 0.2–0.3 m, 3 May 1969, coll. Chevalier; MUSEUM VI Expedition .

Description

Wall oval, with radial ribs, rostro-carinal diameter to 5 mm. Reddish purple, the area between the two rostral radial ribs white, orifice oval. Scutum transversally elongated, growth lines distinct, short broad articular ridge, no occludent ledge. Tergum nearly quadrangular, no external furrow, indistinct spur, internal tooth blunt.

Distribution

Guam, French Polynesia.

Remarks

Treυathana paulayi was recently described by Asami and Yamaguchi (2001). This species is distinguished from Treυathana dentata by the reddish purple colour of its shell, the lack of occludent ledge on the scutum and the lack of internal tooth in the tergum. The type location of T. paulayi is Guam. It was not reported from other localities and the present report indicates that this species is found only in the eastern Pacific. Ross and Newman (2002) noted that the restricted distribution of some pyrgomatines might be an artefact due to lack of information. However, examination of the rich coral collection from Indonesia in the Museum of Natural History in Leiden, The Netherlands (Y. Achituv, unpublished), did not reveal any specimen of Treυathana paulayi supporting the hypothesis that this barnacle is restricted to the eastern Pacific.

Figures

Figure 1. Collection sites of coral-inhabiting barnacles in French Polynesia. Location of Tahiti is marked for reference.

Figure 2. Cantelius tredecimus from Marquesas Islands; Nuku-Hiva Island. (A) Scutum, outer view; (B) scutum, inner view; (C) tergum inner view, tergum is damaged. Scale bars: 1 mm (A, B); 0.5 mm (C).

Figure 3. Treυathana paulayi sample lost, from Gambier Islands; Aukena Island. (A) Shell outer view; (B) shell inner view showing part of basis and interlocking; (C) scutum inner view; (D) scutum outer view; (E) tergum external view; (F) tergum inner view; (G) scutum and tergum attached showing position of internal tooth. Scale bars: 1 mm.