Saging, Uyeno & Tang & Nagasawa, 2013

Uyeno, Daisuke, Tang, Danny & Nagasawa, Kazuya, 2013, Saging Cebuana, A New Genus And Species Of Taeniacanthid Copepod (Cyclopoida) Parasitic On A Filefish (Actinopterygii: Monacanthidae) Collected From Cebu Island, The Philippines, Raffles Bulletin of Zoology 61 (2), pp. 515-523 : 516

Taeniacanthidae C. B. Wilson, 1911 Saging , new genus

Type species. — Saging cebuana , new genus, new species, by present designation.

Etymology. — The generic name means “banana” in the Cebuano language. It alludes to the laterally compressed and slightly curved shape of the female body of the new genus. Gender feminine.

Diagnosis. — Adult female. Body laterally compressed. Cephalothorax composed of cephalosome and first pediger. Second to fourth pedigerous somites and urosomites free, decreasing in width posteriorly. Genital double-somite quadrangular, widest at mid-length. Abdomen composed of three free somites. Caudal ramus with six setae. Rostrum large, well developed.Antennule six-segmented, with pointed, outwardly curved process on anterior margin of proximalmost segment and armature formula 5, 15, 8, 4, 2 + 1 asethetasc, 7 + 1 aesthetasc. Postantennal process present, with additional spiniform process near its base. Antenna four-segmented, composed of coxobasis and three-segmented endopod; second endopodal segment bearing two pectinate processes and one medial claw; third endopodal segment with two terminal claws and three setae. Labrum broad, fringed with row of spinules. Mandible one-segmented, with one terminal and one subterminal blades. Paragnath triangular. Maxillule represented by simple lobe armed with four setae. Maxilla two-segmented, composed of syncoxa and basis; latter tapering into serrated process and bearing one subterminal seta. Maxilliped two-segmented, composed of unarmed syncoxa and basis with two elements. Leg 1 biramous and lamelliform, composed of coxa, basis, and two-segmented rami. Legs 2 to 4 biramous, each composed of coxa, basis, three-segmented exopod, and two-segmented endopod; both rami bearing stout, serrated spines; legs 2 and 3 with extremely elongated proximal endopodal segment. Leg 5 uniramous, two-segmented, composed of protopod and onesegmented exopod; exopod bearing four long naked setae. Leg 6 knob-like, bearing three setae in egg sac attachment area. Egg sac multiserate.

Adult male. Body with weak lateral compression. Cephalothorax composed of cephalosome and first pediger. Second to fourth pedigerous somites and urosomites free, decreasing in width posteriorly. Genital somite rectangular, with paired genital opercula located posteroventrally. Abdomen composed of three free somites. Caudal ramus with six setae. Rostrum large, well developed. Antennule as in female except proximalmost segment bearing smaller process than that of female. Antenna, postantennal process, mandible, paragnath, maxilllule, and maxilla as in female. Maxilliped highly developed as grasping organ, four-segmented. Leg 1 biramous, not lamelliform. Legs 2 and 3 similar to those of female except with patch of spinules on proximal endopodal segment and only three spines on distal endopodal segment, respectively. Legs 4 and 5 similar to those of female.

Remarks. — Saging , new genus, belongs to Taeniacanthidae because it possesses the following combination of characters: a postantennal process; two pectinate processes, plus clawlike spines and setae, on the endopod of the antenna; two subequal, spinulated blades on the mandible; a spinulated terminal process on the maxilla; and a modified, lamelliform leg 1. The new genus resembles Umazuracola in the presence of a spinulated terminal process and naked seta on the maxillary basis, a two-segmented endopod on legs 2 to 4, and strong, coarsely serrated spines on the rami of legs 2 and 3 and on the endopod of leg 4. Ho et al. (2006) described the female maxilliped of U. elongatus as being indistinctly three-segmented, with the basis bearing a rudimentary seta and the endopod drawn out into a slender terminal process. The latter is here re-interpreted as a basis element rather than a vestige of the endopod. While a remnant of the endopod on the female maxilliped may be represented by one or more apical setae in some taeniacanthids, such as Echinosocius gulicolus Dojiri & Humes, 1982 (see Dojiri & Humes, 1982: fig. 26c) and Irodes upenei ( Yamaguti, 1954) (see Dojiri & Cressey, 1987: fig. 125h) for example, two closely-set setae are also present on the maxilliped basis in virtually all taeniacanthids. The two elements on the maxilliped basis are typically situated proximally, but they may also originate near the apical margin as in U. elongatus , the new genus, and other taeniacanthids such as Anchistrotos gobii Brian, 1906 (Dojiri & Cressey, 1987: fig. 101g) and Taeniacanthodes haakeri Ho, 1972 (Dojiri & Cressey, 1987: fig. 150h). The morphological similarities between the new genus and Umazuracola provide further evidence that the latter is a derived member of Taeniacanthidae as proposed initially by Huys et al. (2012). The new genus can be distinguished from Umazuracola by the following combination of characters: 1) third and fourth pedigers separate (vs fused); 2) urosomites distinct (vs fused); 3) postantennal process present (vs absent); 4) leg 1 well-developed, lamelliform, with two-segmented rami (vs reduced, not lamelliform, with two-segmented exopod and one-segmented endopod); 5) first endopodal segment highly elongated on legs 2 and 3 (vs short); 6) leg 6 hidden in a recess on the genital double-somite (vs exposed on urosome); and 7) paired egg sacs multiseriate (vs uniseriate).