Alcockianum persona (Annandale, 1916)

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

Alcockianum persona (Annandale, 1916) Figure 13

Scalpellum persona Annandale, 1916a: 295, pl. IV, fig. 3; pl. V, figs 7, 8; pl. VI, figs 3-5. - Calman 1918b: 120. - Nilsson-Cantell 1934: 44, pl. 5, fig. 2.

Graviscalpellum persona Foster, 1980: 527, figs 1e, 2.

Alcockianum persona Zevina, 1978b: 1345. - 1981: 150-151, fig. 107. - Jones 1992: 151-154, figs 4, 5.

Material examined.

- Tanimbar Island: 2 specimens, MNHN-IU-2019-4903, Stn. CP 71, 08°38'S, 131°44'E, 477-480 m depth, 2 November 1991; 5 specimens, MNHN-IU-2019-4904, Stn. CC 21, 05°14'S, 133°00'E, 688-694 m depth, 25 October 1991 attached to glass rope sponge; 1 specimen, MNHN-IU-2019-4905, Stn. CC 40, 07°46'S, 132°31'E, 443-468 m depth, 28 October 1991; 5 specimens, MNHN-IU-2019-4906, Stn. CC 57, 08°19'S, 131°53'E, 603-620 m depth, 31 October 1991.

Diagnosis.

Capitulum with plates buried or obscure; plates reduced in size; tegum reduced, forming four-pointed star; scutum small; peduncle armed with distinct circles of large, calcareous scales.

Description.

Capitulum brownish, large, ovoid, inflated, with 13 capitular plates, including a vestigial rostrum, plates embedded and mostly concealed by thick, opaque membrane. Scutum small, widely separated from all remaining plates except tergum, margins not excavated or deeply concave; tergum reduced in form as four-pointed star, with two rays greatly and two rays slightly produced. Carina reduced in size, apex approaching terga, widely separated from remaining plates. Peduncle cylindrical, similar length to capitulum, with large calcareous scales arranged in alternating rows. Cirrus I with anterior ramus oval (8-segments), posterior ramus slender, long (12-segments); cirri II-VI slender, long, rami almost equal length; cirrus VI with caudal appendages; caudal appendages 1/3 length of cirrus VI, 15-segmented, tapering distally. Penis rather short, smooth, pointed. Maxilla bilobed, dense setae on margin. Maxillule relatively large, with broad, shallow excavation on lower margin occupying more than half margin, remainder of margin obliquely subtruncate; mandible with three main teeth in addition to inner angle, which is variously divided, broad as a whole. Measurements of five specimens: height of capitulum 17.71-35.06 mm, width 12.91-28.06 mm, thickness 4.96-18.20 mm; length of peduncle 13.42-28.67 mm, width 6.66-10.79 mm.

Distribution.

Indonesian Seas, eastern Australia, New Zealand; 109-915 m depth ( Jones 1992). In this study, Alcockianum persona was found at Tanimbar Island, Indonesia.

Type лocality. Timor Sea (10°22'30"S, 120°7'30"E); 109-366 m depth: bottom temp. 13.1 °C ( Jones 1992).

Figures

Figure 13. Alcockianum persona (Annandale, 1916) (MNHN-IU- 2019 - 4903). a. left lateral view, capitulum and peduncle; b. right lateral view, capitulum and peduncle; c. rostral view, capitulum and peduncle; d. carinal view. Scale bar: 9 mm (a-d).