Tetraclita reni Chan, Hsu & Tsai

Chan, Benny Kwok Kan, Hsu, Chih-Hsiung & Tsai, Pei-Chen, 2009, Morphology and distribution of the acorn barnacle Tetraclita reni nom. nov. (Crustacea: Cirripedia) in Madagascar and adjacent waters, Zootaxa 2019, pp. 57-68 : 59-60

publication ID	https://doi.org/ 10.5281/zenodo.186037
DOI	https://doi.org/10.5281/zenodo.6224764
persistent identifier	https://treatment.plazi.org/id/796FEF4F-0A79-A051-04B5-4ECD73B0CE4E
treatment provided by	Plazi
scientific name	Tetraclita reni Chan, Hsu & Tsai
status

Treatment

Tetraclita reni Chan, Hsu & Tsai nom. nov.

Figures 2 View FIGURE 2 A, 2D, 3A–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 View FIGURE 2 A); mean basi-scutal angle 140 ± 8.6o (n = 6, pooled specimens from Cape Diego, Fort Dauphin and Amobvombe; Fig. 2 View FIGURE 2 A); scutal margin long, lateral depressor muscle crests 6–8. Scutum triangular, large teeth on occludent margin ( Fig. 2 View FIGURE 2 A), tergal margin long; adductor muscle scar deep; depressor muscles crests well developed with 6–9 crests; adductor ridge short ( Fig. 2 View FIGURE 2 A). Rami of cirrus I unequal ( Fig. 3 View FIGURE 3 A, 4A); exopodite (18 segments, Mauritius sample) longer than endopodite (12 segments, Mauritius sample; Fig. 3 View FIGURE 3 A). Cirrus II shortest of cirri, rami approximately equal (exopodite 12 segments, endopodite 11 segments, Mauritius sample, Fig. 3 View FIGURE 3 B). Setae on rami of cirrus I and II serrulate with 3–4 rows of setules ( Fig. 4 View FIGURE 4 A, B, D–F); coxa and base of protopod of cirrus I bearing long, thin, serrulate setae with 5 short setules ( Fig. 3 View FIGURE 3 A, 4A, F), those of cirrus II bearing plumose setae with long feathery setules ( Fig. 3 View FIGURE 3 B, 4B, G); cirrus II additionally bearing flattened, blade-shaped, serrulate setae, each with single row of setules ( Fig. 4 View FIGURE 4 H). cirrus III with rami long,slender, somewhat antenniform ( Fig. 3 View FIGURE 3 C, 4C); exopodite (15 segments) shorter than endopodite (24 segments; Mauritius sample, Fig. 3 View FIGURE 3 C). Setae on rami of cirrus III similar to those on cirrus II ( Fig. 4 View FIGURE 4 C) plus additional dense, serrulate setae ( Fig. 4 View FIGURE 4 E), bidentate, serrate setae ( Fig. 2 View FIGURE 2 C, 4L), bladeshaped serrulate setae ( Fig. 4 View FIGURE 4 H) and large multicuspidate setae ( Fig. 2 View FIGURE 2 D, 4I); setules and inter-setule space of multicuspidate setae larger than those of bidentate serrate setae ( Fig. 2 View FIGURE 2 C, D, 4I, L). Cirri IV, V and VI similar, all bearing serrulate setae with 1 row of setules ( Fig. 4 View FIGURE 4 M, O); simple setae present on segment junctions of cirri IV–VI ( Fig. 4 View FIGURE 4 N, O).

Labrum notch slightly concave, with 4–5 teeth on each side ( Fig. 5 View FIGURE 5 A, B); posterior surface densely clothed in serrulate setae ( Fig. 5 View FIGURE 5 C). Mandible with four teeth, lower angle with ~ 10 small setae ( Fig. 5 View FIGURE 5 D–F). Maxillule notched, two large setae on upper notch, 16 on lower notch ( Fig. 5 View FIGURE 5 I). Mandibulatory palp oval, long serrulate setae distally ( Fig. 5 View FIGURE 5 K, L). Maxilla bi-lobed, covered with dense, serrulate setae, notch between the lobes non-setose ( Fig. 5 View FIGURE 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.