Conopea navicula (Darwin, 1854)

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

Conopea navicula (Darwin, 1854) Figure 34

Balanus navicula Darwin, 1854: 221, pl. 3, fig. 6a-d. - Hoek 1913: 223, pl. 22, fig. 26, pl. 23, figs 1-3. - Stubbings 1936: 48. - Utinomi 1962: 74, fig 1. - Dong et al. 1982: 103.

Acasta spinitergum Foster, 1982: 209, fig. 4d.

Conopea navicula . - Newman & Ross, 1976: 55.

Material examined.

- Tanimbar Island: 12 specimens, MNHN-IU-2019-4821, Stn. CP 82, 09°32'S, 131°02'E, 215-219 m depth, 4 November 1991 attached to gorgonian; 4 specimens, MNHN-IU-2019-4822, Stn. DW 49, 08°00'S, 132°59'E, 206-210 m depth, 29 October 1991, attached to gorgonian.

Diagnosis.

Shell with parietes and basis not porose; carino-lateral compartments very narrow, almost same width from top to bottom; radii with smooth sutural edges; scutum externally striated longitudinally.

Description.

Specimens covered with coenosarc of coral, except orifice. Easily recognisable species due to narrow carino-lateral plate, which is nearly same width at top as bottom; scutum externally longitudinally striated; parietal plates studded with calcareous points. Parietal plates pearly white, solid, superficially appearing to possess longitudinal tubes, growth lines horizontal. Alae moderately developed. Basis calcareous. Size small. Rostrum well developed, concave, lying at angle of ~ 45°. Laterals very well developed. Carino lateral parietes thin, radii and alae well developed. Carina tall, about half width of rostrum. External surfaces of all parietes with very small, calcareous studs, regularly spaced, arranged along horizontal growth lines. Opercular plates sunk down into orifice. Cirrus I with unequal rami (anterior ramus: 5-segmented; posterior ramus: 7-segmented). Cirrus II with unequal rami (anterior ramus: 6-segmented; posterior ramus: 9-segmented). Cirri III-VI with subequal rami more slender, longer, with segments more elongate. Penis very long, tapering towards tip, bearing few, very minute hairs. Maxilulle with straight edge with numerous large setae. Mandibles with five teeth and inferior angle. Measurements of four specimens: basal length of shell 2.23-4.22 mm, orifice length 1.09-2.02 mm, carinal height 2.04-3.09 mm, orifice width 0.94-1.59 mm, basal width 1.79-2.80 mm.

Distribution.

Indo-west Pacific, from Gulfs of Aden and Persia, India, Malaysia, Indonesia, Gulf of Siam, to southern Japan; 45-220 m depth ( Jones and Hosie 2016). In this study, Conopea navicula was found at Tanimbar Island, Indonesia.

Type locality.

Madras, India; attached to gorgonian ( Darwin 1854).

Figures

Figure 34. Conopea navicula (Darwin, 1854) (MNHN-IU- 2019 - 4822). a. left lateral view; b. orifice view. Scale bar: 1 mm (a, b).