Spaniomolgus maculatus, Conradi, Mercedes, Bandera, Eugenia, Mudrova, Sofya V. & Viatcheslav N. Ivanenko,, 2018

Conradi, Mercedes, Bandera, Eugenia, Mudrova, Sofya V. & Viatcheslav N. Ivanenko,, 2018, Five new coexisting species of copepod crustaceans of the genus Spaniomolgus (Poecilostomatoida: Rhynchomolgidae), symbionts of the stony coral Stylophorapistillata (Scleractinia), ZooKeys 791, pp. 71-95 : 78-79

Spaniomolgus maculatus sp. n. Fig. 6

Type locality.

Saudi Arabian Red Sea, reef near Thuwal, 22°19'09.26"N, 38°51'15.78"E.

Material examined.

1 ♀ holotype (ZMMU Me-1215) and 1 ♀ paratype (ZMMU Me-1216) from Stylophora pistillata (morphotype S. subseriata ) (KAUST SA2013-25) collected at 10.4 m depth; 1 additional ♀ from Stylophora pistillata (morphotype S. danae ) (KAUST SA2013-31) (22°03'48.5"N, 38°45'51.2"E) collected at 28 m depth.

Etymology.

The specific Latin epithet maculatus refers to the maculate body surface, light brown when alive.

Description.

Adult female.

Body cyclopiform; oval cephalothorax slightly pointed on top and cylindrical urosome (Fig. 6a). Mean body length 710 µm (with range of 700 - 720 µm) and mean maximum width 315 µm (with range of 270 - 360 µm), based on two specimens. Prosome comprising cephalothorax and three free pedigerous somites. Second pedigerous somite with epimeral area slightly angular and third pedigerous somite with epimeral area rounded. Fourth pedigerous somite smaller than preceding ones, almost invisible in dorsal view.

Urosome s-shaped when alive, with the genital double-somite drawn forward under the metasome and the postgenital somites retained in line with the prosome. Urosome 5-segmented, comprising fifth pedigerous somite, genital double-somite and three free abdominal somites (Fig. 6b). In dorsal view, only the postgenital somites visible. Leg 5 -bearing somite slightly wider than long. Genital double-somite (Fig. 6b) narrow, slightly longer than wide (108 × 92 µm); lateral margins nearly parallel. Paired genital apertures bipartite, each comprising ventrolateral copulatory pore and dorsolateral gonopore (oviduct opening). Each genital area with two very small articulated projections (Fig. 6f). Egg sac unknown. Three postgenital somites 67 × 83, 50 × 63 and 42 × 54 μm from anterior to posterior.

Caudal rami (Fig. 6b) elongated, 125 × 21 µm, 5.0 times longer than wide. With six setae, all short and naked. Outer lateral seta 42 µm, outermost terminal seta 54 µm, inner lateral seta 33 µm, innermost terminal seta 37 µm, median terminal setae 71 µm in length. Dorsal seta 20 µm.

Antennule, mandible, maxillule, maxilla and armature formula for legs 1-4 as for Spaniomolgus globus sp. n.

Antenna (Fig. 6c) 3-segmented; first segment 45 µm long with small hyaline apical seta; second segment 87 µm long with one hyaline seta medially; third segment 55 µm long with two hyaline setae medially, and one apical hyaline seta, with small recurved terminal claw 22 µm long. Length ratio of second to third segments (measured along inner margin) 1.7:1.

Maxilliped (Fig. 6d) 3-segmented; first segment unarmed; second segment robust, with two naked inner setae; third segment claw-like, with two setae medially equal in length; apex with pore.

Leg 4 (Fig. 6e) with 3-segmented exopod and 2-segmented endopod. Inner coxal seta short and naked, outer basal seta short and plumose. Endopod reaching beyond middle of third exopodal segment; with two distal spines unequal in length, outer 30 µm long, inner 50 µm long, the latter spines with hyaline and weakly serrated margins. Outer spines of exopod with smooth lamellae.

Fifth Sixth leg (Fig. 6b) with protopod incorporated into somite; outer basal smooth seta short. Free segment long, slender and recurved, 7.6 times as long as wide, bearing two apical setae unequal in length, inner most about twice as long as outer one.

Male unknown.