Solidobalanus pseudauricoma (Broch, 1931)

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 pseudauricoma (Broch, 1931) Figure 36

Balanus (Solidobalanus) pseudauricoma Broch, 1931. - Utinomi 1949: 97, fig. 4.

Solidobalanus (Solidobalanus) pseudauricoma . - Newman & Ross, 1976: 51. - Jones 2007: 294.

Material examined.

- Kei Islands: 46 specimens, MNHN-IU-2019-4818, Stn. CP 25, 05°30'S, 132°52'E, 336-346 m depth, 26 October 1991, 30 specimens attached to gorgonian, 16 specimens attached to coral; 6 specimens, MNHN-IU-2019-4825, Stn. CP 27, 05°33'S, 132°51'E, 304-314 m depth, 27 October 1991; 1 specimen, MNHN-IU-2019-4826, Stn. CP 05, 05°49'S, 132°18'E, 296-299 m depth, 22 October 1991, attached to crinoid; 13 specimens, MNHN-IU-2019-4827, Stn. CP 16, 05°17'S, 132°50'E, 330-350 m depth, 24 October 1991; 2 specimens, MNHN-IU-2019-4828, Stn. DW 22, 05°22'S, 133°01'E, 82 m depth, 25 October 1991, 1 specimen attached to gorgonian stem; 8 specimens, MNHN-IU-2019-4830, Stn. CP 05, 05°49'S, 132°18'E, 296-299 m depth, 22 October 1991, 5 specimens attached to gorgonian, 1 specimen attached to crinoid.

- Tanimbar Island: 11 specimens, MNHN-IU-2019-4839, Stn. CP 86, 09°26'S, 131°13'E, 223-225 m depth, 4 November 1991, several specimens attached to spines of sea urchins (associated with Solidobalanus auricoma (Hoek, 1913)).

Diagnosis.

Shell with smooth, glossy white plates, coloured stripes absent; internal plates with thick, solid, finely ribbed longitudinally; base non-porous, radially ribbed.

Description.

Shell plates white, stripes absent. Several specimens with pale pink tinge, one with pale brownish-pink parietes with small, narrow ellipsoidal whitish spots, latter orientated longitudinally producing reticulated effect. Radii whitish, pink tinge along distal borders. Scutal growth lines without longitudinal striations; articular ridge absent; pit for adductor muscle small, round. Tergum with shallow, wide furrow running from apex to base. Cirrus I with unequal (anterior ramus: 7-segmented; posterior ramus: 15-segmented). Cirrus II with rami subequal (anterior ramus: 11-segmented; posterior ramus: 12-segmented). Cirri I and II with very dense, long setae on surface areas. Cirri III-VI with rami slightly subequal, rounded. Penis sturdy, not long. Labrum with very shallow notch, three or four irregularly arranged, blunt teeth on each side. Maxillule with distinct, narrow notch with two large setae on upper side. Mandibles with five teeth, second and third bifid and fifth is rudimentary. Measurements of five specimens: basal length of shell 6.23-12.08 mm, orifice length 4.63-9.62 mm, carinal height 3.48-13.22 mm, orifice width 3.24-6.33 mm, basal width 5.66-9.56 mm.

Distribution.

Manado Bay (Indonesia); Japan ( Broch 1931-1932). In this study, Solidobalanus pseudauricoma was found at Kei Islands and Tanimbar Island, Indonesia.

Type locality.

Manado Bay, Indonesia (1°31'N, 124°47'E), 500 m depth; Japan (32°25'N, 128°33'E), 400 m depth ( Broch 1931-1932).

Remarks.

In the type description, Broch (1931-1932) commented that the specimens were white, without stripes. However, several of the specimens collected by KARUBAR had a pale pink tinge and one specimen (from station DW22) had pale brownish-pink parietes with small, narrow ellipsoidal whitish spots, the latter orientated longitudinally, thus producing a reticulated effect. Radii whitish with pink tinge along distal borders.

Figures

Figure 36. Solidobalanus pseudauricoma (Broch, 1931) (MNHN-IU- 2019 - 4818). a. left lateral view; b. orifice view; c. basal view; d. right lateral view. Scale bar: 4 mm (a-d).