Annandaleum japonicum subsp. biramosum Pilsbry 1911
Creators: name: Chan, Benny K. K.
name: Prabowo, Romanus Edy
name: Lee, Kwen-Shen
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Pedunculata
Scalpellidae
Annandaleum
Annandaleum japonicum
Annandaleum japonicum biramosum (pilsbry, 1911)

description: Annandaleum japonicum biramosum (Pilsbry, 1911)
Figures 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 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 A); 14 partially calcified capitular plates, separated by broad, chitinous interspaces (Fig. 2 A); tergum inverted V-shaped, umbo apical, branch at carinal margin longer than occludent margin branch (Fig. 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 A); rostrum very small, narrow; rostrolatus quadrangular, wider than high (Fig. 2 A); inframedian latus higher than wide, vase-shaped, umbo submedial (Fig. 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 A); maxillule slightly notched, 3 long and 1 short cuspidate setae above notch, notch naked, 9 cuspidate setae below notch (Fig. 14 B); mandible with 3 teeth (Fig. 14 C), first tooth separated from second and third (Fig. 14 E, G), lower margin very short, setae absent, inferior angle blunt with 5 setae (Fig. 14 E); mandibular palp subtriangular, elongated, setae distally and along superior margin, inferior margin naked (Fig. 14 D); cutting edge of labrum straight, with very fine teeth (Fig. 14 F, H). Cirrus I separated from cirri II–VI; rami of cirrus I subequal, outer ramus longest, 12 segmented (Fig. 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 B), cirrus VI with outer ramus 29-segmented, inner ramus 26-segmented (Fig. 15 C); caudal appendage ~ 1/3 length of cirrus VI, 10-segmented (Fig. 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.
description: Published as part of 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, pp. 1-47 in Zootaxa 2405 on pages 17-23, DOI: 10.5281/zenodo.194179