Acetabularia calyculus Lamouroux

Coppejans, Eric, Leliaert, Frederik, Verbruggen, Heroen, de Clerck, Olivier, Schils, Tom, de Vriese, Thomas & Marie, Daniel, 2004, The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean), Journal of Natural History 38 (23), pp. 2959-3020 : 2997-2998

* Acetabularia calyculus Lamouroux , in Quoy and Gaimard, 1824: 621, pl. 90,

figures 6 , 7 References: Valet, 1969: 605–607, 517–618, pl. 44, figures 7–9 ; Tseng, 1984: 268,

pl. 133, figure 3 ; Berger and Kaever, 1992: 128, 154, figures 3.67, 3.68 ; Kraft,

2000: 630, figure 42A.

Type locality. Shark Bay , Western Australia .

Voucher. HEC 14792, 25 September 2001, Passe Grand Bassin (s.s. 4) .

Ecology. Only two specimens were found, which were growing on a subtidal coral fragment at 1 m depth.

Distribution. Andaman Islands, Nicobar Islands, Australia, Bahrain, Bangladesh, India, Kenya, Kuwait, Mauritius ( Børgesen, 1946: 33), Mozambique, Rodrigues (this paper), Saudi Arabia, South Africa.

* Acetabularia clavata Yamada, 1934: 57–59 , figures 14 , 25 Reference: Valet, 1969: 605–607, 620–621, pl. 12, figures 1 , 3–6 , pl. 19, figure 1 ,

pl. 20, figures 3 , 8 , pl. 22, figure 3 , pl. 23, figure 1 , pl. 30, figure 7 , pl. 38, figure 2 ,

pl. 45, figures 1–4 .

Type locality. Tomari , Okinawa-gunto, Ryukyu-retto, Japan .

Voucher. HEC 14845 (zF), 29 September 2001, Grand Paté (s.s. 7) .

Ecology. In large numbers on a dead coral fragment in a gulley between coral heads, 15 m deep.

Distribution. Comores, Kenya, Mauritius ( Segonzac, 1983: table 1; 1984: 102, table 1), Rodrigues (this paper), Seychelles, Tanzania, Thailand.

General remarks on the distribution of Acetabularia in the Mascarene Islands

Acetabularia calyculus Lamouroux occurs on both Mauritius and Rodrigues. A. clavata has not been mentioned for Mauritius but Børgesen (1940: 44) reports A. parvula Solms-Laubach (~ A. moebii Solms-Laubach ) from that island; the latter has not been collected on Rodrigues.

Figures

FIGS 2–6. Chlorophyta. (2) Microdictyon tenuius, detail of branching and anastomosing patterns (HEC 14849). (3) Bryopsis pennata var. pennata, branchlets of last order contiguous and in a single plane (HEC 14796 p.p.). (4) Bryopsis pennata var. leprieurii, branchlets of last order interrupted and in a single plane (HEC 14757).(5) Bryopsis pennata var. secunda, branchlets of last order curved in one direction (HEC 14796 p.p.). (6) Chamaedoris delphinii (HEC 14617). Scale bars: 250 mm (2); 5 mm (3–5); 1 cm (6).

FIGS 7–13. Caulerpa brachypus, variation in the general morphology and margin structure of the assimilators. (7) Large growth form collected in grooves between bumps of coral rubble, frequently branching and with secondary stolons (HEC 14867). (8) Intermediately large growth form with wide assimilators (HEC 14769). (9) Intermediately large growth form with relatively narrow assimilators (HEC 14656a). (10) Typical specimen with simple or scarcely branched assimilators (HEC 14612). (11) Assimilator with smooth margin (HEC 14612). (12) Assimilator with coarsely dentate margin (HEC 14656a). (13) Assimilator with densely dentate margin (HEC 14718). Scale bars: 2 cm (7–10); 1 mm (11–13).

FIGS 14–18. Caulerpa. (14) Caulerpa cupressoides var. lycopodium f. elegans, small, elegant specimen (HEC 14691). (15) Caulerpa cupressoides var. lycopodium f. elegans, coarse specimen with richly branched assimilators (HEC 14820). (16) Caulerpa sertularioides f. sertularioides, last order branchlets in a single plane (HEC 14739). (17) Caulerpa sertularioides f. farlowii, last order branchlets in several planes (HEC 14690). (18) Caulerpa webbiana (HEC 14699). Scale bars: 1 cm.

FIGS 25–30. Phaeophyta. (25, 26) Cladosiphon mauritianus (HEC 14789b): (25) general morphology; (26) apical branches. (27, 28) Chnoospora implexa (HEC 14674b): (27) compact form; (28) thin, slender form. (29) Hydroclathrus tenuis (HEC 14756d). (30) Asteronema breviarticulatum, rope-like appearance of intertwined filaments (HEC 14884). Scale bars: 2 cm (25); 1 cm (26–30).

FIG. 1. Sampling stations. See table 1 for a list of the stations and their GPS coordinates. Map redrawn from Wells (1988). The outer grey line represents the fringing reef.