Tetraclita reni Chan, Hsu & Tsai

Tetraclita reni Chan, Hsu & Tsai nom. nov. Figures 2 A, 2 D, 3 A–C, 4, 5 Tetraclita squamosa rufotincta Utinomi, 1968: 180 (Cape Diego, Madagascar) Tetraclita africana Ren, 1989: 452, 453, fig. 12 (Sainte Luce, Madagascar, type locality) Material examined. Cape Diego, Madagascar (Galathea stn. 223), ZMUC CRU- 9881, Tetraclita squamosa rufotincta (3 specimens), 03-March- 1951, det. Utinomi 1967; Connoniers Point, Mauritius, ZMUC CRU- 9882, Tetraclita squamosa rufotincta (2 specimens), 30 -April- 1929, coll. Th. Mortensen; Ambovombe, Madagascar, MNHN Entrée no. 7, Tetraclita (1 specimen), 1931, coll. D. de M. R. Decary; Sarodrano, Madagascar, MNHN C.l. 664, Tetraclita porosa rufotincta (2 specimens), 1906, coll. F. Geay; Fort Dauphin, Madagascar, MNHN, Tetraclita porosa (1 specimen), 1901, coll. Ferlus. Description. Parietes pink, surfaces of some older specimens with white patches due to erosion. Posterior side of scutum and tergum varying from pink to white. Terga from majority of samples with wide base, rounded spur (Fig. 2 A); mean basi-scutal angle 140 ± 8.6 o (n = 6, pooled specimens from Cape Diego, Fort Dauphin and Amobvombe; Fig. 2 A); scutal margin long, lateral depressor muscle crests 6–8. Scutum triangular, large teeth on occludent margin (Fig. 2 A), tergal margin long; adductor muscle scar deep; depressor muscles crests well developed with 6–9 crests; adductor ridge short (Fig. 2 A). Rami of cirrus I unequal (Fig. 3 A, 4 A); exopodite (18 segments, Mauritius sample) longer than endopodite (12 segments, Mauritius sample; Fig. 3 A). Cirrus II shortest of cirri, rami approximately equal (exopodite 12 segments, endopodite 11 segments, Mauritius sample, Fig. 3 B). Setae on rami of cirrus I and II serrulate with 3–4 rows of setules (Fig. 4 A, B, D–F); coxa and base of protopod of cirrus I bearing long, thin, serrulate setae with 5 short setules (Fig. 3 A, 4 A, F), those of cirrus II bearing plumose setae with long feathery setules (Fig. 3 B, 4 B, G); cirrus II additionally bearing flattened, blade-shaped, serrulate setae, each with single row of setules (Fig. 4 H). cirrus III with rami long,slender, somewhat antenniform (Fig. 3 C, 4 C); exopodite (15 segments) shorter than endopodite (24 segments; Mauritius sample, Fig. 3 C). Setae on rami of cirrus III similar to those on cirrus II (Fig. 4 C) plus additional dense, serrulate setae (Fig. 4 E), bidentate, serrate setae (Fig. 2 C, 4 L), bladeshaped serrulate setae (Fig. 4 H) and large multicuspidate setae (Fig. 2 D, 4 I); setules and inter-setule space of multicuspidate setae larger than those of bidentate serrate setae (Fig. 2 C, D, 4 I, L). Cirri IV, V and VI similar, all bearing serrulate setae with 1 row of setules (Fig. 4 M, O); simple setae present on segment junctions of cirri IV–VI (Fig. 4 N, O). Labrum notch slightly concave, with 4–5 teeth on each side (Fig. 5 A, B); posterior surface densely clothed in serrulate setae (Fig. 5 C). Mandible with four teeth, lower angle with ~ 10 small setae (Fig. 5 D–F). Maxillule notched, two large setae on upper notch, 16 on lower notch (Fig. 5 I). Mandibulatory palp oval, long serrulate setae distally (Fig. 5 K, L). Maxilla bi-lobed, covered with dense, serrulate setae, notch between the lobes non-setose (Fig. 5 G, H). Diagnosis. Tetraclita reni nom. nov. is characterized by the multicuspidate setae on cirrus III, which are not seen in other species of Tetraclita except T. japonica Pilsbry 1916, a Pacific species (Ren 1989; Chan 2001). Distribution. Northeastern and southern Madagascar and Mauritius. Remarks. Ren (1989) described a new species of Tetraclita from Madagascar with the epithet africana, which was preoccupied by Tetraclita wireni africana (Nilsson-Cantell 1932). Tetraclita wireni was later assigned to Tesseropora (see Newman & Ross 1976). As Tetraclita africana Ren 1989 is a junior homonym of Tetraclita wireni africana Nilsson-Cantell 1932, Tetraclita reni nom. nov. is erected for the species described by Ren (1989). The present study provides new records of T. reni nom. nov. in southern and northeastern Madagascan waters and Mauritius. Etymology. Tetraclita reni nom. nov. is named in honour of Professor Xianqiu Ren, Institute of Oceanology, Chinese Academy of Science, in recognition of his discovery of this new species (= T. africana) and for his contributions in the field of Chinese barnacle taxonomy.