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.