Solidobalanus auricoma (Hoek, 1913)

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

Solidobalanus auricoma (Hoek, 1913) Figure 35

Balanus (Solidobalanus) auricoma Hoek, 1913: 198, pl. XVIII, figs 20-22, pl. XIX, figs 1-7. - Broch 1922: 323, fig. 62. - 1931: 71. - Foster 1978: 100, fig. 60. - Rosell 1981: 303.

Solidobalanus (Solidobalanus) auricoma . - Newman & Ross, 1976: 50.

Solidobalanus auricoma . - Foster,1981: 364, fig. 2G. - Rossel 1991: 38.

Material examined.

- Tanimbar Island: 2 specimens, MNHN-IU-2019-4842, Stn. CP 45, 07°54'S, 132°47'E, 302-305 m depth, 29 October 1991, shell only; 10 specimens, MNHN-IU-2019-4841, Stn. DW 49, 08°00'S, 132°59'E, 206-210 m depth, 29 October 1991, attached to sea urchin spines; 1 specimen, MNHN-IU-2019-4838, Stn. CP 82, 09°32'S, 131°02'E, 215-219 m depth, 4 November 1991, attached to antipatharian; 7 specimens, MNHN-IU-2019-4847, Stn. CP 85, 09°22'S, 131°14'E, 240-245 m depth, 4 November 1991, attached to spines of sea urchin; 63 specimens, MNHN-IU-2019-4850, Stn. CP 86, 09°26'S, 131°13'E, 223-225 m depth, 4 November 1991, attached to spines of sea-urchins.

- Kei Islands: 1 specimen, MNHN-IU-2019-4849, Stn. CP 05, 05°49'S, 132°18'E, 296-299 m depth, 22 October 1991, attached to lateral plate of Chirona tenuis ; 1 specimen, MNHN-IU-2019-4844, Stn. CP 12, 05°23'S, 132°37'E, 413-436 m depth, 23 October 1991, attached to antipatharian; 6 specimens, MNHN-IU-2019-4848, Stn. CP 16, 05°17'S, 132°50'E, 330-350 m depth, 24 October 1991, attached to dead gorgonian, spines of sea-urchins, arm of crinoid; 3 specimens, MNHN-IU-2019-4840, Stn. CP 35, 06°08'S, 132°45'E, 390-502 m depth, 27 October 1991; 1 specimen, MNHN-IU-2019-4843, Stn. CP 36, 06°05'S, 132°44'E, 210-268 m depth, 27 October 1991.

Diagnosis.

Shell flatly-conical, colour reddish basally, whitish apically; radii narrow, summits slightly oblique; opercular plates with golden hairs along occludent margins; scutum with articular ridge slightly prominent, adductor ridge absent; tergum narrow, scutal margin distinctly dentated.

Description.

Shell with plates ribbed longitudinally. Shell colour brownish-pink to dull rose-pink, ribs tending to white, colour often faded with specimens appearing uniform white. Parietes of carinolatera very narrow, with single, conspicuous, longitudinal ridge. Scutum with occludent margin straight, surface indistinctly ridged, pit for adductor muscle scarcely visible. Tergum short, narrow, scutal margin straight, unusually distinctly dentated, carinal margin short, convex, depressor muscle crests moderately well developed. Opercular plates with long, golden setae fringing occludent margins, especially distally. Cirri I-II with rami slightly unequal, covered with setae; cirri III-VI longer, more slender, dense setae on inner face. Mandible with four teeth, second to fourth with accessory cusps, lower angle molariform with three blunt cusps in series, lower edge with row of stiff setae. Measurements of five specimens: basal length of shell 6.11-8.18 mm, orifice length 4.18-5.83 mm, carinal height 4.11-6.30 mm, orifice width 2.58-3.19 mm, basal width 4.51-5.96 mm.

Distribution.

Banda Sea (Moluccas, Indonesia); SW Australia; New Zealand; New Caledonia; Philippines to southern Japan; Malaysian water; Gulf of Oman, Persia. 27-502 m depth ( Jones and Hosie 2016). In this study, Solidobalanus auricoma was found at Kei Islands and Tanimbar Island, Indonesia.

Type locality.

Ternate anchorage; 27 m depth; bottom: mud and stone; numerous specimens on the surface of pieces of rock ( Hoek 1913).

Figures

Figure 35. Solidobalanus auricoma (Hoek, 1913) (MNHN-IU- 2019 - 4850). a. upper lateral view from above; b. left lateral view; c. right lateral view; d. basal view. Scale bar: 2 mm (a-d).