Five new coexisting species of copepod crustaceans of the genus Spaniomolgus (Poecilostomatoida: Rhynchomolgidae), symbionts of the stony coral Stylophorapistillata (Scleractinia) Conradi, Mercedes Bandera, Eugenia Mudrova, Sofya V. Viatcheslav N. Ivanenko, ZooKeys 2018 791 71 95 6Z88W http://zoobank.org/4A6D3CC9-2492-4092-82D8-38F95675696A Copepoda Rhynchomolgidae Spaniomolgus CoL Animalia Spaniomolgus dentatus Cyclopoida 5 76 Arthropoda species dentatus   Typelocality. Saudi Arabian Red Sea, reef near Thuwal, 22°03'48.5"N, 38°45'51.2"E.  Material examined. 1 ♀ holotype (ZMMU Me-1213) and 1 ♀ paratype (ZMMU Me-1214) from Stylophora pistillata(morphotype S. danae) (KAUST SA2013-31) collected at 28 m depth.  Etymology. The specific name from the Latin dentatus, refers to the denticulated margin of the maxillipedal claw.  Description. Adult female. Body cyclopiform, with oval cephalothorax and cylindrical urosome (Fig. 5a). Body length 750 µmand maximum width 390 µm. Prosome comprising cephalothorax and three free pedigerous somites. Second and third pedigerous somites with slightly rectangular epimeral areas. Fourth pedigerous somite smaller than preceding ones, its epimeral areas much less expanded.  Figure 5. Spaniomolgus dentatussp. n., female. a Habitus dorsal b Urosome dorsal (Leg 6 arrowed) c Antenna d Maxilliped e Leg 4. Scale bars: 300 µm(a); 100 µm(b); 50 µm( c-e). Urosome 5-segmented, comprising fifth pedigerous somite, genital double-somite and three free abdominal somites (Fig. 6b). Leg 5-bearing somite wider than long. Genitaldouble-somite (Fig. 5b) slightly longer than wide (95 x83 µm); lateral margins nearly parallel. Paired genital apertures bipartite, each comprising ventrolateral copulatory pore and dorsolateral gonopore (oviduct opening). Each genital area with two minute spiniform elements (Fig. 5b). Egg sac unknown. Three postgenital somites 55 x83, 53 x72 and 39 x67 μmfrom anterior to posterior. Caudal rami (Fig. 5b) elongated, 108 x25 µm, 4.3 times as long as wide. With six setae; all setae relatively short and naked. Outer lateral seta 44 µm, outermost terminal seta 41 µm, innermost terminal seta 33 µm. Two median terminal setae broadened, 72 µm(outer) and 66 µm(inner) in length. Dorsal seta 39 µm. Antennule, mandible, maxillule, maxilla and armature formula for legs 1-4 as for Spaniomolgus globussp. n. Antenna (Fig. 5c) 3-segmented; first segment 53 µmlong with small terminal hyaline seta; second segment 68 µmlong with seta medially; third segment 60 µmlong with three hyaline setae medially and two apical hyaline setae, small recurved terminal claw 24 µmlong. Second and third segments measured along inner margin subequal in length. Maxilliped (Fig. 5d) 3-segmented. First segment unarmed; second segment slightly elongated, with two naked inner setae; third segment claw-like, denticulate distally, with two setae medially. Leg 4 (Fig. 5e) with 3-segmented exopod and 2-segmented endopod. Inner coxal seta and outer basal seta naked. Endopod reaching beyond middle of third exopodal segment; second segment with two apical spines unequal in length, outer 30 µmlong, inner 50 µmlong, the latter spines with hyaline and weakly serrated margins. Outer spines of exopod with barbed lamellae. Fifth Sixth leg (Fig. 5b) with protopod incorporated into somite; outer basal seta not observed. Free segment long, slender and recurved, 4.2 times as long as wide, bearing two apical setae unequal in length, inner most about twice as long as outer one. Sixth leg (arrowed in Fig. 5b) represented by two very small articulated projections near attachment of eggs sacs. Male unknown.