Annandaleum japonicum biramosum (Pilsbry, 1911)

Chan, Benny K. K., Prabowo, Romanus Edy & Lee, Kwen-Shen, 2010, North West Pacific deep-sea barnacles (Cirripedia, Thoracica) collected by the TAIWAN expeditions, with descriptions of two new species, Zootaxa 2405, pp. 1-47 : 17-23

publication ID	https://doi.org/ 10.5281/zenodo.194179
DOI	https://doi.org/10.5281/zenodo.6211811
persistent identifier	https://treatment.plazi.org/id/C1306911-FFD6-0F77-C988-F893FDB6FB63
treatment provided by	Plazi
scientific name	Annandaleum japonicum biramosum (Pilsbry, 1911)
status

Treatment

Figures 2 View FIGURE 2 A, 14, 15

Scalpellum japonicum Hoek, 1883: 67 , pl. 3 figs 9, 10.

Scalpellum japonicum biramosum Pilsbry, 1911: 68 , pl. 11 figs 1, 2. Annandaleum japonicum . — Newman & Ross, 1971: 122.

Material examined. NMNS 003636-00062, 1 specimen, Stn. CP130 (22º18.77’N, 120º6.99’E, 22 Aug. 2001, depth: 728– 709 m), CL 19.42 mm, CW 11.57 mm, PL 8.26 mm; CEL-BB-87, 1 specimen, Stn. CP196 (24º51.75’N, 122º3.75’E, 11 Sept. 2002, depth: 636–787 m). CL 20.75 mm, CW 11.95 mm, PL 7.81mm.

Diagnosis. Opercular plates not completely calcified; tergum inverted V-shaped; scutum with apicolateral arm ~ 1/3 length of tergal margin ( Fig. 2 View FIGURE 2 A); upper latus irregular, subtriangular, branch extending along scutal margin, bifid, simple on carinal side; inframedian latus higher than wide, vase-shaped, umbo submedial; caudal appendage relatively long, 10-segmented.

Description. Capitulum covered by semi-transparent, pale yellow membrane ( Fig. 2 View FIGURE 2 A); 14 partially calcified capitular plates, separated by broad, chitinous interspaces ( Fig. 2 View FIGURE 2 A); tergum inverted V-shaped, umbo apical, branch at carinal margin longer than occludent margin branch ( Fig. 2 View FIGURE 2 A); scutum long, narrow, umbo apical, slightly overlapping tergal margin, lateral margin with apicolateral arm ~ 1/3 length of tergal margin; upper latus irregular, subtriangular, branch at scutal margin bifid, branch at carinal margin simple ( Fig. 2 View FIGURE 2 A); rostrum very small, narrow; rostrolatus quadrangular, wider than high ( Fig. 2 View FIGURE 2 A); inframedian latus higher than wide, vase-shaped, umbo submedial ( Fig. 2 View FIGURE 2 A); carinolatus V-shaped, lateral margin bifid; carina bowed, roof flat, width greater in basal region. Maxilla subtriangular, margin covered with dense setae in 3 clusters ( Fig. 14 View FIGURE 14 A); maxillule slightly notched, 3 long and 1 short cuspidate setae above notch, notch naked, 9 cuspidate setae below notch ( Fig. 14 View FIGURE 14 B); mandible with 3 teeth ( Fig. 14 View FIGURE 14 C), first tooth separated from second and third ( Fig. 14 View FIGURE 14 E, G), lower margin very short, setae absent, inferior angle blunt with 5 setae ( Fig. 14 View FIGURE 14 E); mandibular palp subtriangular, elongated, setae distally and along superior margin, inferior margin naked ( Fig. 14 View FIGURE 14 D); cutting edge of labrum straight, with very fine teeth ( Fig. 14 View FIGURE 14 F, H). Cirrus I separated from cirri II–VI; rami of cirrus I subequal, outer ramus longest, 12 segmented ( Fig. 15 View FIGURE 15 A), inner ramus broader, shorter, 11 segmented; cirri II–VI with rami subequal; cirrus II with outer ramus 25-segmented, inner ramus 21- segmented ( Fig. 15 View FIGURE 15 B), cirrus VI with outer ramus 29-segmented, inner ramus 26-segmented ( Fig. 15 View FIGURE 15 C); caudal appendage ~ 1/3 length of cirrus VI, 10-segmented ( Fig. 15 View FIGURE 15 C).

Distribution. Pacific waters in Japan and Taiwan.

Remarks. Pilsbry (1911) identified the sub-species biramosum of Annandaleum japonicum . Compared to Annandaleum japonicum , A. j. biramosum has the umbo of the carina closer to the upper end of the plate with the branch of the upper latus extending along the scutal margin bifid and simple on the carinal side. The inframedian latus is less excavated along its upper border in A. j. biramosum (Pilsbry, 1911) . However, Pilsbry (1911) doubted that such difference in plate morphology represented intra-specific variation. In the present study, the maxillule and mandible of A. j. biramosum are similar to Pilsbry’s illustration of the maxillule and mandible of A. japonicum (Pilsbry, 1911) . The taxonomic status and morphological variation of A. japonicum and A. j. biramosum should be evaluated using molecular techniques. The present record of A. j. biramosum is a new record for Taiwanese waters.