Anuretes plectorhynchi Yamaguti 1936
Creators: name: Boxshall, Geoff
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Siphonostomatoida
Caligidae
Anuretes
Anuretes plectorhynchi

description: Anuretes plectorhynchi Yamaguti, 1936
(Fig. 9)
Material examined. 1♀, 3♂♂ from Diagramma labiosum MacLeay, 1883 (TC16955), 10 January 2016; 1♀, 1♂ QM Reg. No. W53047; 2♂♂ NHMUK Reg. Nos 2017.190–191.
Site on host. Unknown (in body wash).
Differential diagnosis. Cephalothorax dorsoventrally flattened with well-developed marginal membranes; about 1.17 times longer than wide; thoracic zone extending posteriorly to completely conceal short fourth pedigerous somite in dorsal view (Fig. 9A). Frontal plates lacking lunules. Genital complex broadest anteriorly, with convex lateral and posterior margins resulting in a semicircular outline in dorsal view; about 1.8 times wider than long; genital complex and abdomen less than 20% of length of cephalothorax; abdomen reduced, largely incorporated into genital complex; bearing paired caudal rami posteroventrally (Fig. 9B). Antenna (Fig. 9C) with acute posteriorly-directed process on proximal segment. Post-antennal process curved; associated papillae unisensillate. Tine of maxillule long and straight; post-oral process short, hook-like (Fig. 9C). Maxillary whip simple (not bifid). Sternal furca (Fig. 9D) with slightly-divergent tines. Pair of well-developed, hook-like processes present on ventral cephalothoracic surface posterior to intercoxal sclerite of leg 1 (Fig. 9D). Distal exopodal segment of leg 1 with 3 plumose setae on posterior margin; distal spines 2 and 3 each with accessory process; seta 4 offset, originating on ventral surface of segment, just longer than spine 1. Leg 2 with outer spine on first exopodal segment straight and elongate, lying obliquely across surface of ramus and extending almost to distal tip of ramus (Fig. 9E); outer spine on segment 2 similar in shape but smaller; proximal outer spine of segment 3 smaller than distal; distal outer spine with lateral membrane around tip. Leg 3 (Fig. 9F) with 2-segmented exopod; bearing large straight spine on proximal segment and 8 setal elements on compound distal segment: endopod 2-segmented; first segment unarmed, compound distal segment with 6 setae. Leg 4 uniramous, 3-segmented; exopodal segments with I; III spines. Leg 5 comprising outer protopodal seta isolated on surface of genital complex and well-defined exopodal lobe bearing 3 plumose setae and rudimentary spine (Fig. 9B). Body length of adult female 1.28 mm. Mean body length of adult male 0.82 mm, range 0.78 to 0.86 mm (based on 3 specimens).
Remarks. Yamaguti (1936) described A. plectorhynchi based on three females collected from Diagramma pictum (as Plectorhynchus pictus) caught in the “Pacific”, presumably close to Japan (from the title of the paper). The species recorded as A. plectorhynchi by Prabha & Pillai (1986) from Indian waters was clearly not conspecific with Yamaguti’s type material, and was recognized as a distinct species by Ho & Lin (2000) and renamed A. similis Ho & Lin, 2000. Anuretes plectorhynchi was recently reported from the Philippines on Platax orbicularis (Forsskål, 1775) (Venmathi Maran et al., 2016). This is the first record from Australian waters.
description: Published as part of Boxshall, Geoff, 2018, The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species, pp. 1-172 in Zootaxa 4398 (1) on page 26, DOI: 10.11646/zootaxa.4398.1.1, http://zenodo.org/record/1202953