Chthamalus moro Pilsbry, 1916

Pitriana, Pipit, Valente, Luis, von Rintelen, Thomas, Jones, Diana S., Prabowo, Romanus E. & von Rintelen, Kristina, 2020, An annotated checklist and integrative biodiversity discovery of barnacles (Crustacea, Cirripedia) from the Moluccas, East Indonesia, ZooKeys 945, pp. 17-83 : 17

Chthamalus moro Pilsbry, 1916 Figure 12a, b , Table 1: species no. 57

Chthamalus malayensis : Utinomi 1954: 18-21 (part.); Karande and Palekar 1963 (part.); Pope 1965 (part.); Newman and Ross 1976 (part.).

Chthamalus moro Pilsbry, 1916: 311; Nilsson-Cantell 1921: 277; Broch 1922: 307 (part.); Hiro 1937b: 49; Rosell 1972: 178; Dong et al. 1980: 125; Ren 1984: 153; Southward and Newman 2003: 798, fig. 2B; Chan et al. 2009a: 165, fig.141.

non Chthamalus moro Broch, 1922: 307 (part.); Broch 1931: 56 (includes a euraphiid).

non Chthamalus moro Nilsson-Cantell, 1934: 50 (a euraphiid).

non Chthamalus moro Poltarukha, 2001b: 160 (= C. malayensis ).

Material examined.

Ambon Island: 2 specimens, MZB Cru Cir 036, Alang, 3°45'11.0"S, 128°01'23.1"E, coll. Adin, 20 Sep 2017; 2 specimens, MZB Cru Cir 037, Asilulu, 3°40'50.4"S, 127°55'27.6"E, coll. Adin, 20 Sep 2017; 10 specimens, MZB Cru Cir 038, Hila, 3°34'57.5"S, 128°05'31.9"E, coll. Adin, 20 Sep 2017; 7 specimens, MZB Cru Cir 039, Hatu, 3°43'52.7"S, 128°02'51.4"E, coll. Adin, 20 Sep 2017; 44 specimens, MZB Cru Cir 040, Mamala, 3°33'20.5"S, 128°11'32.8"E, coll. Adin, 20 Sep 2017; 38 specimens, MZB Cru Cir 041, Morella, 3°31'06.5"S, 128°13'18.0"E, coll. Adin, 20 Sep 2017; 25 specimens, MZB Cru Cir 042, Wakasihu, 3°46'27.6"S, 127°56'36.6"E, coll. Adin, 20 Sep 2017. Pombo Island: 4 specimens, MZB Cru Cir 043, Pombo, 3°31'55.5"S, 128°22'28.8"E, coll. P. Pitriana & D. Tala, 8 Sep 2016. Saparua Island: 32 specimens, MZB Cru Cir 044, Dermaga Ihamahu, 3°31'13.0"S, 128°41'14.9"E, coll. P. Pitriana & D. Tala, 11 Apr 2016; 31 specimens, MZB Cru Cir 045, Kulur, 3°29'48.5"S, 128°36'10.7"E, coll. P. Pitriana & D. Tala, 20 Sep 2016; 40 specimens, MZB Cru Cir 046, Waisisil, 3°34'48.6"S, 128°39'04.8"E, coll. P. Pitriana & D. Tala, 8 Apr 2016. Seram Island: 15 specimens, MZB Cru Cir 047, Desa Murnaten, 2°51'48.8"S, 128°20'32.3"E, coll. P. Pitriana & D. Tala, 19 Sep 2017.

GenBank accession numbers.

COI gene (MK995377-MK995388), 18S (MK981391-MK981400).

Diagnosis.

Shell with six plates; rostrum and carina with radii; rostral lateral lacking radii; carinal lateral absent; base membranous; conical spines on cirrus I absent; basal guard on apex setae of cirrus II absent.

Description.

Shell white to grey, surface with strong, radiating lines, orifice elliptical (Fig. 12a ); parietes solid (Fig. 12b ); scutum triangular, tergal margin straight; tergum triangular, scutal margin curved; conical spines on dorsal side of cirrus I absent, cirrus II with multi-cuspidate setae without basal guard. Basal length 2.4-5.1 mm, basal width 1.4-4.1 mm and height 0.8-1.7 mm. Orifice length 1.0-3.4 mm and orifice width 0.7-1.7 mm (measurements for 25 specimens are presented in Suppl. material 1: Table S11).

Distribution.

Chthamalus moro is widely distributed in the Indo-Pacific-Indonesia, Philippines, Taiwan, Xisha Islands, Ryukyu Islands, Palau, Mariana Islands, Caroline Islands, Fiji, and Samoa ( Southward and Newman 2003). In this study, C. moro was found on the islands of Ambon (at Hatu, Mamala, Alang, Asilulu, Hila, Morella, Wakasihu), Pombo, Seram (at Murnaten), and Saparua (at Ihamahu, Kulur, and Waisisil) on mangroves, stone, port pole, mollusd shell, shells of Tetraclita squamosa , Tesseropora rosea and Capitulum mitella (a map with the occurrence of Chthamalus moro in the Moluccas is shown in Suppl. material 1: Fig. S3).

Remarks.

Species of the genus Chthamalus are very difficult to distinguish in the field. Chthamalus moro has a stellate appearance and is smaller than C. malayensis ( Southward and Newman 2003). In addition, conical spines on the dorsal side of cirrus I are absent and setae on cirrus II are without basal guards in C. moro .

Figures

Figure 12. Chthamalus moro Pilsbry, 1916 (MZB Cru Cir 042 - 1) a upper view b lower view. Scale bar: 1 mm.