Amigdoscalpellum rigidum ( Aurivillius, 1898 )

Young, Paulo S., 2001, Deep-sea Cirripedia Thoracica (Crustacea) from the northeastern Atlantic collected by French expeditions, Zoosystema 23 (4), pp. 705-756 : 739-740

Amigdoscalpellum rigidum ( Aurivillius, 1898)

( Fig. 26 )

Scalpellum rigidum Aurivillius, 1898: 189 .

Amigdoscalpellum rigidum – Zevina 1978: 1349; 1981: 277, fig. 209. — Young 1998a: 25, figs 16, 19 (with synonymy); 1998b: 42.

MATERIALEXAMINED. — BENGAL 2, stn 13078#27, 48°50.13’N, 16°39.86’W to 48°59.06’N, 16°38.58’W, 4844 m, 1 specimen, tl (cl) 38.8 (29.8) mm (MNRJ 13916). — SEAMOUNT 2, stn CP 236, 32°03.72’N, 27°40.59’W, 1925 m to 32°05.52’N, 27°39.69’W, 1960 m, 1 specimen, tl (cl) 21.6 (17.0) mm ( MNHN Ci 2878).

REMARKS

The specimen collected at station 13078 is exceptionally large ( 38.8 mm) and probably represents the greatest length this species attains. The plates appear to be old with a considerable amount of erosion. It is interesting to note how reduced the inframedian-latus is in this specimen, when compared with younger ones ( Fig. 26 ). The inframedian-latus seems to lose its function of covering the suture between the lower latera and becomes an eroded small plate situated over the rostrolatus.

Amigdoscalpellum rigidum is a common deepsea pedunculate occurring between 1267 and 4810 m from the Azores, Cape Verde, Iberian, West European and Newfoundland basins ( Aurivillius 1898; Gruvel 1905; Young 1998a, b).

Figures

FIG. 26. — Amigdoscalpellum rigidum (Aurivillius, 1898); A-C, stages of reduction of the inframedian-latus in different sizes of the specimens, left lateral view; A, from Biaçores Expedition, MNRJ 8879; B, SEAMOUNT 2, stn CP 236; C, BENGAL 2, 13078#27. Abbreviations: cl, carino-lateral; rl, rostro-lateral. Scale bars: A, B, 2 mm; C, 5 mm.