Megalasma striatum 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

Megalasma striatum Hoek, 1883 Figure 8

Megalasma striatum Hoek, 1883: 51, pl. II, figs 5-9, pl. VII, figs 8, 9. - Broch 1931: 270, figs 29, 30.

Megalasma (Megalasma) elegans . - Zullo & Newman, 1964: 355, fig. 2a-i.

Megalasma (Megalasma) striatum . - Zevina 1982: 80, fig. 71. - Chan 2009: 66, figs 2A, 16 A-H.

Material examined.

- Kei Islands: 1 specimen, MNHN-IU-2019-4868, Stn. CP 09, 05°23'S, 132°29'E, 368-389 m depth, 23 October 1991; 1 specimen, MNHN-IU-2019-4869, Stn. CP 16, 05°17'S, 132°50'E, 315-349 m depth, 24 October 1991, attached to sea urchin spine; 2 specimens, MNHN-IU-2019-4866, Stn. CP 17, 05°15'S, 133°01'E, 439-459 m depth, 24 October 1991.

- Tanimbar Island: 1 specimen, MNHN-IU-2019-4867, Stn. CP 46, 08°01'S, 132°51'E, 271-273 m depth, 29 October 1991; 4 specimens (3 attached to sea urchin spine), MNHN-IU-209-4870, Stn. DW 49, 08°00'S, 132°59'E, 206-210 m depth, 29 October 1991; 6 specimens, MNHN-IU-2019-4871, Stn. CP 85, 09°22'S, 131°14'E, 240-245 m depth, 4 November 1991, attached to spines of sea urchin.

Diagnosis.

Capitulum ovate, occludent margin almost same length as carinal margin; capitular plates heavily calcified, markedly sculptured with radial striations between grooves of growth lines; peduncle short, covered by capitulum.

Description.

Capitulum white, with five calcified plates, surfaces strongly striated. Scutum with basal margin rotated; tergum triangular in lateral view; carina with dorsal roof widening apically on either side of midline groove. Cirrus I with anterior ramus wider than posterior ramus. Maxillule with three strong setae at upper angle separated by wide notch; mandible with four teeth, lower angle sharp. Measurements of specimen: basal diameter of capitulum 2.14 mm; capitular height 9.36 mm; total height 9.36 mm; scutal width 3.81 mm; scutal length 7.28 mm; tergal width 1.58 mm; tergal length 4.29 mm.

Distribution.

West-southwest Pacific, Indo-west Pacific, East coast of Africa, Indian Ocean, north Australia, Indonesia, Malay Archipelago, East China Sea, South China Sea, Taiwan, Philippines, south Japan to New Zealand; attached to echinoid spines, antipatharians, gorgonians, glassy spicule of hexactinellid sponges, corallines; 125-984 m depth ( Jones and Hosie 2016). In this study, Megalasma striatum was found at Kei Islands and Tanimbar Island, Indonesia.

Type locality.

Philippine Archipelago ( Hoek 1883).

Figures

Figure 8. Megalasma striatum Hoek, 1883 (MNHN-IU- 2019 - 4868). a. left lateral view, capitulum; b. right lateral, capitulum; c. anterior view, capitulum and peduncle; d. posterior view, carina. Scale bar: 2 mm (a-d).