Regioscalpellum moluccanum (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

Regioscalpellum moluccanum (Hoek, 1883) Figure 10

Scalpellum moluccanum Hoek, 1883: 104, pl. V figs 3, 4; 1907: 56, 85, pl. VII, fig. 13. - Gruvel 1905: 76, fig. 85. - Nilsson-Cantell 1927: 747, fig. 3.

Arcoscalpellum moluccanum . - Newman & Ross, 1971: 60. - Jones et al. 1990: 6, 27. - Jones 1992: 172-175, figs 18, 19.

Trianguloscalpellum moluccanum . - Jones, 2012: 371, table 2. - Shalaeva and Boxshall 2014: 45, fig. 31.

Regioscalpellum moluccanum . - Gale, 2016: 298.

Material examined.

- Tanimbar Island: 3 specimens, MNHN-IU-2019-4909, Stn. CP 38, 07°40'S, 132°27'E, 620-666 m depth, 28 October 1991; 1 specimen, MNHN-IU-2019-4910, Stn. DW 49, 08°00'S, 132°59'E, 206-210 m depth, 29 October 1991; 1 specimen, MNHN-IU-2019-4911, Stn. CC 57, 08°19'S, 131°53'E, 603-620 m depth, 31 October 1991; 1 specimen, MNHN-IU-2019-4912, Stn. CP 52, 08°03'S, 131°48'E, 1244-1266 m depth, 30 October 1991.

Diagnosis.

Capitulum with 14 plates, surface covered by chitinous, almost smooth membrane; carina simply, not strongly bowed, apex projecting freely, roof not flat; umbo of the carina apical; upper latus almost triangular.

Description.

Capitulum inflated, subtriangular, apices of plates projecting freely through membrane, growth lines fairly distinct. Scutum trapezioid, umbo apical. Tergum large, oval, truncated, very pointed, extending between upper latus and carina. Carina simply, slightly bowed, roof slightly convex, apex projecting freely. Upper latus quadrangular; rostrum very small, carinate; rostral latus trapeziform; infra-median latus triangular, moderately small; carinal margins of carinal latera convex, touching each other at base and below middle of carina. Peduncle stout, slightly thinner below apex. Cirrus I unequal, anterior ramus oval, posterior ramus more slender; cirrus VI with long caudal appendages. Maxillule not notched, large spine on upper side, cutting edge almost straight; mandible with three large teeth excluding inferior angle. Measurements of five specimens: height of capitulum 7.88-14.89 mm, width 4.81-10.65 mm, thickness 2.15-5.24 mm; length of peduncle 3.38-9.13 mm, width 2.09-6.04 mm.

Distribution.

Pacific, Central and Southwest; Tasman Sea, north-eastern Australia; 788-2,745 m depth ( Jones 2012; Shalaeva and Boxshall 2014). In this study, Regioscalpellum moluccanum was found at Tanimbar Island, Indonesia.

Type locality.

Banda Sea (4°21'S, 129°7'E); Challenger stn 195; 2,606 m depth: bottom temp. 3 °C; substrate grey ooze ( Hoek 1883).

Figures

Figure 10. Regioscalpellum moluccanum (Hoek, 1883) (MNHN-IU- 2019 - 4909). a. left lateral view showing the capitulum and peduncle; b. right lateral view showing the capitulum and peduncle; c. carinal view showing the capitulum and peduncle; d. rostral view showing the capitulum and peduncle. Scale bar: 4 mm (a-d).