Cardiodectes bellwoodi Uyeno, 2013, n. sp.
Creators: name: Uyeno, Daisuke
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Siphonostomatoida
Pennellidae
Cardiodectes
Cardiodectes bellwoodi

description: Cardiodectes bellwoodi n. sp.
(Figs 1 A, B, 2–3)
Type material. Holotype female (AMP.90285) and 1 paratype female (AMP.90286), ex Istigobius nigroocellatus (Günther) (Perciformes: Gobiidae), Pioneer Bay, Orpheus Island (18°35’S, 146°20’E), Great Barrier Reef, Australia, 4-6 m depth, 12-17 April, 2011, reg. D. Bellwood.
Description of postmetamorphic adult female. Body (Fig. 2 A) 4170 long, comprising large cephalothorax, neck region and trunk. Cephalothorax (Fig. 2 B, C, D) wider than long 1032 × 1565, bearing paired anterior lobes forming branching processes and expanded laterally forming paired, rounded lobes. Neck region (Fig. 2 B, C, D) narrow. Trunk (Fig. 2 A, E) broad bean shaped, less than twice as long as wide 2460 × 1360, with posterior margin straight. Egg sac spiral (Fig. 2 A) uniseriate, originating at posterolateral genital apertures.
Rostrum, antennules, and antennae situated closely to each other on anterodorsal surface of cephalothorax (Fig. 3 A). Rostrum convex with rounded free margin (Fig. 3 A). Antennule (Fig. 3 A, B) unsegmented, bearing 8 setae mainly on anterior margin; distal tip bearing 8 setae, 2 bifurcate setae, and 1 aesthetasc. Antenna (Fig. 3 A, C) 3-segmented, chelate, typical pennellid in form; proximal segment unarmed; middle segment bearing pointed projection on inner medial margin and pocket; terminal claw with 1 small basal seta on posterior surface. Mouth tube, maxillule, and maxilla located on anterior part of ventral surface of cephalothorax. Maxillule (Fig. 3 D) rodlike, situated to side of mouth tube, armed with bifid process at distal tip and simple process at base; processes elongate tapering towards tip. Maxilla (Fig. 3 E) 2-segmented, located closely behind maxillule; proximal segment unarmed; terminal segment incompletely 2-segmented, with rounded distal part bearing pointed process, covered with small spinules. Maxilliped absent.
Legs 1 and 2 (Fig. 3 F, G) biramous, situated on posterior half of cephalothorax (Fig. 2 D). Leg 3 (Fig. 3 H, I) uniramous, situated behind lobe on neck. Armature formula of all three legs as follows:
Protopod of legs 1 to 3 (Fig. 3 F, G, H, I) separated from respective intercoxal sclerites by long gaps. Variability of female morphology. The morphology of the female paratype is as in the holotype. The measurements of the paratype are as follows: body length 3809; cephalothorax length 1024; cephalothorax width 1180; trunk length 2717; trunk width 1507.
Attachment site. The cephalothorax and neck of the copepod were embedded in the musculature of the host’s trunk at the base of the pectoral fin and penetrated the cardiac region, while its trunk and egg sacs remain outside the fish’s body wall (Fig. 1 A, B).
Remarks. The fourteen nominal species of the genus Cardiodectes are separated into two groups, the ‘ medusaeus ’ group and the ‘ rubosus ’ group by the presence or absence of a defined abdomen (Izawa 1970; Bellwood 1981). Since C. bellwoodi n. sp. has a trunk without an abdomen, it belongs to ‘ rubosus ’ group which contains 8 species, C. asper, C. bertrandi, C. boxshalli, C. hardenbergi, C. krishnai, C. rotundicaudatus, C. rubosus, and C. spiralis. The four species, C. hardenbergi, C. krishnai, C. rotundicaudatus and C. rubosus, differ from C. bellwoodi n. sp. by having a trunk more than twice as long as wide. The trunk of the new species is less than twice its width. The short trunk is also shared with C. asper, C. bertrandi, C. boxshalli, and C. spiralis, but the new species is distinguished from these species by having a pair of large anterior lobes forming branched processes (vs. anterior lobes absent or present but without branched processes) (Bellwood 1981; Uyeno & Nagasawa 2010).
Etymology. The specific name of the new species, bellwoodi, honors Dr. David Bellwood who has greatly contributed to the taxonomy of the genus Cardiodectes. He collected the gobies infected by the new species.
description: Published as part of Uyeno, Daisuke, 2013, Two new species of Cardiodectes Wilson, 1917 (Copepoda: Siphonostomatoida: Pennellidae) from gobiid fishes (Actinopterygii: Perciformes) in the western Pacific Ocean, pp. 301-311 in Zootaxa 3664 (3) on pages 302-306, DOI: 10.11646/zootaxa.3664.3.1, http://zenodo.org/record/217551