Nodoscarus curvus, Kim & Boxshall, 2020

Kim, Il-Hoi & Boxshall, Geoff A., 2020, Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata), Megataxa 4 (1), pp. 1-6 : 635

publication ID

https://doi.org/ 10.11646/megataxa.4.1.1

DOI

https://doi.org/10.5281/zenodo.6422174

persistent identifier

https://treatment.plazi.org/id/03C487CB-ED2B-384E-FF4D-F94BFDF0FEEC

treatment provided by

Plazi

scientific name

Nodoscarus curvus
status

gen. et sp. nov.

Nodoscarus curvus gen. et sp. nov.

( Figs. 429 View FIGURE 429 , 430 View FIGURE 430 )

Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21452 ) , paratypes (2 intact ♀♀, MNHN-IU-2014-21453), anddissectedparatype (♀, figured) from Aplidium lobatum Savigny, 1816 , Mont Dore, New Caledonia, Monniot coll., 19 March 1987.

Etymology. The specific name refers to the curved body of the new species as usual for the genus.

Description of female. Body ( Fig. 429A, B View FIGURE 429 ) vermiform, cylindrical, unsegmented, curved, densely covered with numerous minute setules (setules not shown in Fig. 429 View FIGURE 429 A-C). Bodylength 3.64 mm; body width 0.51 mm at widest region in middle, slightly narrowing in anterior and posterior quarters. Cephalosome poorly defined from metasome ( Fig. 429C View FIGURE 429 ), with rounded anterior margin. Posterior part of body bearing horizontal sclerotization bar and weak cleft (as vestige of articulation between metasome and urosome) on dorsal surface ( Fig. 429E View FIGURE 429 ), copulatory pore on ventral surface ( Fig. 429F View FIGURE 429 ), and shallow posteromedian incision. Caudal rami absent (fully incorporated into posterior margin of abdomen), but 1 small caudal seta present on each side.

Rostrum ( Fig. 429D View FIGURE 429 ) large, longerthanwide, weakly tapering towards rounded apex; surface covered with numerous setules. Antennule ( Fig. 429G View FIGURE 429 ) as unsegmented lobe, much wider than long, densely setulose on ventral surface, armed with about 20 small setae. Antenna ( Fig. 429H View FIGURE 429 ) stout, 3-segmented; coxa and basis unarmed; endopod distinctly shorter than basis, about 1.8 times longerthanwide (44×25 μm); armedwith 6 smallsetae (arranged as 2, 2, and 2) plus stout terminal claw, about half as long as endopod.

Labrum ( Fig. 429D View FIGURE 429 ) broad with convex posterior margin. Mandible ( Fig. 430A View FIGURE 430 ) represented only by lobate palp bearing 7 setae distally (4 on outer side and 3 on slightly projecting inner side). Maxillule ( Fig. 430B View FIGURE 430 ) as lobe bearing 9 setae (3 on medial margin smaller than others). Maxilla ( Fig. 430C View FIGURE 430 ) distinctly 3-segmented, with 2, 1, and 4 setae on first to third segments, respectively; setae on first segment weakly pinnate, remaining setae naked. Maxillipeds and legs absent.

Male. Unknown.

Remarks. Three characteristic features of N. curvus gen. et sp. nov. serve to differentiate itfrom its congeners: (1) the mandibular palp is armed with 7 setae; (2) the maxilla is distinctly 3-segmented and (3) is armed with 2, 1, and 4 setae on first to third segments, respectively. The presence of a single small caudal seta on the tip of the paired posteriorabdominal lobes seems to be an additional differential feature of the new species.

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