Altiverruca quadrangularis ( Hoek, 1883 )

Young, Paulo S., 2001, Deep-sea Cirripedia Thoracica (Crustacea) from the northeastern Atlantic collected by French expeditions, Zoosystema 23 (4), pp. 705-756 : 743-744

Altiverruca quadrangularis ( Hoek, 1883)

Verruca quadrangularis Hoek, 1883: 140 , pl. 11, figs 10, 11, pl. 12, figs 8-12; 1907b: 9. — Murray 1895: 386. — Weltner 1895: 289; 1897: 274; 1898: 9. — Gruvel 1905: 174, fig. 193; 1912: 5; 1920: 40. — Lahille 1910: 78. — Nilsson-Cantell 1955: 219. — Ross & Newman 1969: 31.

Verruca quadrangularis sect D Altiverruca – Pilsbry 1916: 41.

Altiverruca quadrangularis – Zevina 1988: 39; Buckeridge 1994: 93. — Foster & Buckeridge 1995: 367, fig. 11a-o. — Young 1998a: 77.

Verruca (Altiverruca) quadrangularis – Rosell 1989: 24, pl. 7, figs a-e.

MATERIALEXAMINED. — SEAMOUNT 2, stn DW 203, 31°09.52’N, 28°43.52’W, 845 m to 31°09.67’N, 28°43.38’W, 990 m, 2 specimens, rc 3.1 to 4.2 mm (MNHN Ci 2885, MNRJ 13922). — Stn DW 240, 33°12.26’N, 29°01.87’W, 565 m to 33°12.25’N, 29°01.41’W, 575 m, 4 specimens and 1 empty shell, rc 2.0 to 2.7 mm (MNHN Ci 2886, MNRJ 13923). — Stn DW 251, 33°13.47’N, 29°28.39’W, 985 m to 33°13.49’N, 29°28.75’W, 900 m, 1 specimen, rc 4.0 mm (MNRJ 13924). — Stn DW 278, 33°57.77’N, 28°22.40’W, 890 m to 33°57.47’N, 28°22.48’W, 925 m, 2 specimens, rc 2.0 to 3.1 mm (MNHN Ci 2888, MNRJ 13925).

MARVEL, stn PL 1196, Mid-Atlantic Ridge, Rainbow vent site, 36°13.78’N, 33°54.14’W, 2295 m, 2 specimens, rc 3.9 to 4.7 mm (MNHN Ci 2889, MNRJ 13926).

REMARKS

The present specimens ( Fig. 29 ) agree with the original description of A. quadrangularis . The complete specimen figured by Hoek (1883: pl. 12, fig. 8) differs from the details of the opercular valves shown in his pl. 12, figs 11, 12. In his fig. 12, the tergum has a flat surface between the tergal margin and it has longitudinal ridges, which are missing from the specimen in his fig. 8. My specimens have this area well-developed ( Fig. 29A, C ). Otherwise, the medial ridge of the tergum is more pronounced in his fig. 11 when compared with his fig. 8. This ridge is barely distinguished in the present specimens.

The specimens exhibit variable development of the carinal apex. Sometimes it projects ( Fig. 29C, D ), and is reminiscent of the carinal apex of Altiverruca longicarinata (Gruvel, 1900) . However, this latter species has a distinct rostrum and carina, both with a flat surface near the opercular margins.

Figures

FIG. 29. — Altiverruca quadrangularis (Hoek, 1883); A-B, MARVEL, stn PL 1196, top and fixed-tergum and fixed-scutum views of an specimen with short carina; C-D, SEAMOUNT 2, stn DW 251, top and fixed-tergum and fixed-scutum views of an specimen with elongated carina. Scale bar: 1 mm.