An annotated checklist and integrative biodiversity discovery of barnacles (Crustacea, Cirripedia) from the Moluccas, East Indonesia Author Pitriana, Pipit Museum fuer Naturkunde- Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany & Research Centre for Deep-sea, Indonesian Institute of Science (LIPI), Jl. Y. Syaranamual, Poka, Tlk. Ambon, Kota Ambon, Maluku, Indonesia & Institute of Geological Sciences, Freie Universitaet Berlin, Malteserstrasse 74 - 100 Building C and D, 12249 Berlin, Germany pipit.pitriana@mfn.berlin Author Valente, Luis Museum fuer Naturkunde- Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany & Naturalis Biodiversity Center, Understanding Evolution Group, Postbus 9517, 2300 RA Leiden, the Netherlands Author von Rintelen, Thomas Museum fuer Naturkunde- Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany https://orcid.org/0000-0002-6253-3078 Author Jones, Diana S. The Western Australian Museum, 49 Kew Street, Welshpool WA 6106, Locked Bag 49, Welshpool DC WA 6986, Australia Author Prabowo, Romanus E. Faculty of Biology, Universitas Jenderal Soedirman, Purwokerto, 53122, Indonesia https://orcid.org/0000-0003-0632-7461 Author von Rintelen, Kristina Museum fuer Naturkunde- Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany https://orcid.org/0000-0003-4167-3570 text ZooKeys 2020 945 17 83 http://dx.doi.org/10.3897/zookeys.945.39044 journal article http://dx.doi.org/10.3897/zookeys.945.39044 1313-2970-945-17 A91BFE95C9534B86871074871CDFAC94 5720B610AE6F502EBE10B09F42EDF080 Microeuraphia sp. Figure 11a-o , Table 1: species no. 55 Material examined. Seram Island : 2 specimens, MZB Cru Cir 138, Pantai Waimeteng-Piru, 3°04'15.3"S , 128°11'45.8"E , coll. P. Pitriana & D. Tala, 21 Sep 2017. GenBank accession numbers. COI gene (MK995389, MK995390), 18S (MK981401, MK981402). Diagnosis. Shell small with six thin plates; basis membranous; scutum and tergum remain articulated, scutum higher than wide; mandible tridentate; caudal appendage absent; one individual with two penises. Description. Shell brownish (Fig. 11a, b ), depressed (Fig. 11c ); orifice diamond shaped (Fig. 11a, b ); overlap of 'rostrolateral' forming T junction (Fig. 11b ); scutum and tergum triangular, tergal margins straight (Fig. 11d, e ); cirrus I with anterior ramus longer than posterior (Fig. 11f ); mandible with smooth tridentate teeth (11o). Ranges of basal length 3.6-9.9 mm, basal width 3.0-9.1 mm, height 1.2-2.2 mm. Orifice of diamond shape with orifice length 1.5-4.5 mm, orifice width 0.7-3.6 mm (measurements for two specimens are presented in Suppl. material 1: Table S10). Figure 11. Microeuraphia sp. (MZB Cru Cir 136-1) a upper view b lower view c side view d external view of scutum and tergum e internal view of scutum and tergum f cirrus I g cirrus II h cirrus III i cirrus IV j cirrus V k cirrus VI l penis m maxilla n maxillule o mandible. Scale bars: 3 mm ( a-c ); 0.5 mm ( d-l ); 0.25 mm ( m-o ). Distribution. In this study, Microeuraphia sp. was found on Seram Island (at Pantai Waimeteng, Piru) (a map with the occurrence of Microeuraphia sp. in the Moluccas is shown in Suppl. material 1: Fig. S5). Remarks. Microeuraphia sp. clustered as a unit, forming a well-supported clade in the COI tree (Fig. 29 ). Morphologically, one individual of this species exhibited two penises.