Trianguloscalpellum balanoides (Hoek, 1883)

Pitriana, Pipit, Jones, Diana S., Corbari, Laure & Rintelen, Kristina von, 2020, New insights gained from museum collections: Deep-sea barnacles (Crustacea, Cirripedia, Thoracica) in the Museum National d'Histoire Naturelle, Paris, collected during the Karubar expedition in 1991, Zoosystematics and Evolution 96 (2), pp. 649-698 : 649

Trianguloscalpellum balanoides (Hoek, 1883) Figure 25

Scalpellum balanoides Hoek, 1883: 129, pl. V, fig. 15, pl. X, fig. 11, pl. XI, figs 1-3. - Broch 1922: 242, fig. 10 - Weltner 1922: 63, taf. II, fig. 7, taf. III, fig. 8. - Nilsson-Cantell 1931: 2. - Hiro 1937b: 42, fig. 33.

Scalpellum gonionotum Pilsbry, 1907b: 360. - Pilsbry 1911: 65, pl. IX, figs 2-4. - Hiro 1937a: 43.

Trianguloscalpellum balanoides . - Zevina, 1978b: 1349. - 1981: 294, fig. 221. - Liu and Ren 1985: 210, fig. 16, pl. XI, figs 15-17. - 2007: 256-257, fig. 111. - Rosell 1991: 20-22, fig. 2c, d. - Huang 1994: 517. - 2001: 318. - Jones et al. 2001: 253. - Young 2001: 464, fig. 7. - Jones 2007: 292. - Chan et al. 2009b: 116, figs 95, 96. - Shalaeva and Boxshall 2014: 40, fig. 26.

Material examined.

- Kei Islands: 1 specimen, MNHN-IU-2019-4923, Stn. CP 16, 05°17'S, 132°50'E, 330-350 m depth, 24 October 1991, attached to crinoid.

- Tanimbar Island: 2 specimens, MNHN-IU-2019-4924, Stn. CP 86, 09°26'S, 131°13'E, 223-225 m depth, 4 November 1991.

Diagnosis.

Capitulum with 13 fully calcified plates, covered by thin membrane; carina and extremely short, simply bowed without distinct roof; umbo of carina at apex; upper latus triangular; carinal latus almost as high as carina, umbo apical, carinal latus very large, almost similar size to tergum.

Description.

Capitulum flat, narrow at base, same breadth as peduncle. Scutum about twice as long as broad; occludent margin almost straight, umbo at apex. Tergum triangular, the same size as scutum. Carina very short, simply, not very strongly, bowed, umbo at apex. Upper latus triangular, carinal margin absent. Rostral latus quadrangular, umbo at apex of angle formed by rostral and scutal margins. Infra-median latus elongate, triangular, umbo apical. Carinal latus very large, convex, umbo at top of carinal margin. Cirrus I unequal, posterior ramus more slender than anterior ramus; cirrus VI with caudal appendages. Maxillule distinctly notched, two stout spines on upper side; mandible with three teeth excluding inferior angle. Measurements of specimen: height of capitulum 8.20 mm, width 4.40 mm, thickness 1.75 mm; length of peduncle 5.06 mm, width 2.10 mm.

Distribution.

Pacific, Western Central; South and East China Sea; South of Sumatra, Banda Sea, Indonesia; Vietnam; Philippines; Taiwan; South of Japan; attached to crinoids, hydroids; 220-1,097 m depth ( Jones et al. 2001; Chan et al. 2009b; Shalaeva and Boxshall 2014). In this study, Trianguloscalpellum balanoides was found at Kei Islands and Tanimbar Island, Indonesia.

Type locality.

5°42'S, 132°25'E; depth: 232 m; bottom: mud; attached to arm of a Comatula or Pentacrinus ( Hoek 1883).

Figures

Figure 25. Trianguloscalpellum balanoides (Hoek, 1883) (MNHN-IU- 2019 - 4923). a. left lateral view showing the capitulum and peduncle; b. right lateral view showing the capitulum and peduncle; c. rostral view showing the capitulum and peduncle; d. carinal view. Scale bar: 2 mm (a-d).