COPEPODA H. Milne Edwards

Song, Sung Joon, Kangtia, Pawana, Khim, Jong Seong & Chullasorn, Supawadee, 2018, Two new Asian species of the genus Scottolana Huys, 2009 (Copepoda: Canuelloida: Canuellidae), Journal of Natural History 52 (7 - 8), pp. 377-403 : 379-392

publication ID	https://doi.org/ 10.1080/00222933.2018.1432777
publication LSID	lsid:zoobank.org:pub:33BFE1A2-8C95-4A9D-9E7A-B495CEEC3182
persistent identifier	https://treatment.plazi.org/id/03802D3E-FFED-FFBF-F0E3-67E7FB7CFA1C
treatment provided by	Felipe
scientific name	COPEPODA H. Milne Edwards
status

Treatment

Subclass COPEPODA H. Milne Edwards

Order CANUELLOIDA Khodami et al. 2017 Family CANUELLIDAE Lang

Genus Scottolana Huys, 2009

Scottolana jasani sp. nov.

( Figures 1–8 View Figure 1 View Figure 2 View Figure 3 View Figure 4 View Figure 5 View Figure 6 View Figure 7 View Figure 8 )

Type locality

Gusipo Beach , Jeollanam-do in Korea (35°26′36″N, 126°26′01″E), at 30 cm depth from muddy sand sediments; collected by Sung Joon Song GoogleMaps . GoogleMaps

Type material examined

Holotype female ( NIBRIV0000787895 ): dissected on 16 slides . Allotype male ( NIBRIV0000787896 ): dissected on 17 slides . Paratypes ( NIBRIV0000787897 ): two females and five males preserved in alcohol . All specimens are from the type locality collected by Dr Sung Joon Song on 5 May 2006.

Etymology

The species was named after Jung, Yakjeon’ s pen name, Jasan, who was a great scholar in the Joseon Dynasty, and recorded 155 marine species from the Heuksan Island, Korea in 1814.

Description of the adult female (holotype)

Habitus ( Figure 1 View Figure 1 (a)). Total body length 1.31 mm measured from anterior margin of rostrum to posterior margin of caudal ramus. Largest width at posterior border of cephalic shield. Body surface with long sensilla. All somites without distinct posterior hyaline frills, except for anal somite with smooth hyaline frill dorsally.

Urosome ( Figures 1 View Figure 1 (a), 2(a)) gradually tapering posteriorly, 4-segmented consisting of P5-bearing somite, genital double-somite, one free urosomite and anal somite. Genital double-somite slightly wider than long; original segmentation marked by paired dorsolateral and ventrolateral internal cuticular ribs ( Figure 2 View Figure 2 (a)). P6 ( Figure 2 View Figure 2 (c)) represented by 1 long outer seta and 2 internal projections (outer one very small). Anal operculum ( Figure 1 View Figure 1 (a)) weakly developed without ornamentation.

Caudal rami ( Figures 1 View Figure 1 (a), 1(b), 2(a), 2(d)) about twice as long as wide, with hook-like extension on inner margin proximally; outer margin and posteroventral surface with dense clusters of strong spinules of different lengths. Each ramus armed with 7 setae: seta I strong and with dull at tip, arising ventrally; seta II long, plumose, normal, located halfway the inner margin; seta III plumose, dorsally displaced, issuing halfway the caudal ramus; distal margin of ramus with 3 setae as follows: seta IV and seta V well-developed, strongly spinulose; seta V about 3 times as long as the former ( Figure 1 View Figure 1 (a)); seta VI small and bare; seta VII short and smooth, located on dorsal surface between setae II and VI.

Rostrum ( Figure 1 View Figure 1 (a)) very large, bell-shaped with peaked tip, about 1.4 times as long as wide.

Antennule ( Figure 3 View Figure 3 (a-c)) indistinctly 3-segmented. First segment longest and largest, showing 2 incomplete sutures in posterior margin, with 24 pinnate/smooth setae; second segment short, with 4 spinulose setae; distal segment with 14 setae. Armature formula: 1-(24 + 1ae), 2-(4), 3-(14).

Antenna ( Figure 3 View Figure 3 (d), 3(e)) biramous; coxo-basis short. Endopod 2-segmented; enp-1 with 1 minute and 1 long pinnate seta; enp-2 with several setules, with 4 lateral pinnate setae and 6 apical setae. Exopod 8-segmented; segments 1–7 with 1 plumose seta each; segment 8 ( Figure 3 View Figure 3 (e)) with 4 pinnate setae.

Mandible ( Figure 4 View Figure 4 (a)) well-developed gnathobase bearing a row of 5 strong multicuspidate teeth and 2 small setae distally; with additional tiny spinules on anterior surface subdistally. Basis with 2 plumose setae and spinular rows as shown. Endopod 2-segmented; enp-1 with 1 bare and 2 plumose setae; enp-2 with 4 subapical and 4 apical setae. Exopod 4- segmented; all setae plumose; each segment with 1, 1, 1, and 3 setae, respectively.

Maxillule ( Figure 4 View Figure 4 (b)). Praecoxal arthrite with 8 distal spines, 2 lateral setae, and 2 anterior surface setae; with 2 rows of spinules. Coxa with epipodite represented by 2 plumose setae; endite cylindrical, with 5 pinnate setae. Basis with 8 pinnate setae and posterior row of spinules. Endopod 2-segmented; enp-1 with 4 pinnate setae laterally; enp-2 with 2 subapical and 4 apical pinnate setae. Exopod rounded, 1-segmented, with longitudinal row of outer setules, with 11 long plumose setae.

Maxilla ( Figure 4 View Figure 4 (c), 4(d)) comprising praecoxa, coxa, allobasis and 3-segmented endopod. Praecoxa with several posterior spinules; with 2 endites; proximal endite with 1 smooth and 4 pinnate setae; distal endite with 2 pinnate setae. Coxa with 2 cylindrical endites, bearing 3 pinnate setae each. Allobasis with 3 strong pinnate spines and 4 pinnate setae. Endopod 3-segmented, all setae smooth; enp-1 and enp-2 with 3 setae each; enp-3 small, with 2 setae.

Maxilliped ( Figure 4 View Figure 4 (e)) phyllopodial, 2-segmented, comprising undivided protopod and 1-segmented endopod; incomplete suture indicating boundary between syncoxa and basis. Protopod with 12 setae/spines (1 praecoxal seta, 9 coxal setae, and 2 basal setae); with rows of surface spinules as illustrated; with outer longitudinal row of long setules subdistally. Endopod 1-segmented with 11 elements (7 inner pinnate setae and 4 outer plumose setae).

P1 ( Figure 5 View Figure 5 ) smaller than other swimming legs. Praecoxa without ornamentation. Coxa with inner longitudinal row of setules, and 6 medial spinules; inner coxal seta spinulose in anterior half and pinnate in posterior half. Basis with 1 pinnate inner spine and 1 spinulose long outer seta, with inner longitudinal row of setules. Exopod 3- segmented; exp-1 with 1 bipinnate outer spine, with outer strong spinules, inner longitudinal row of setules, and minute spinules distally; exp-2 with 1 bipinnate outer spine and 1 plumose inner seta, with setule line distally; exp-3 outwardly directed, with 3 bipinnate outer spines, distally with 1 long, spinulose spine and 1 bipinnate seta, and 2 inner plumose setae. Endopod 3-segmented, as long as exopod; enp-1 with 1 plumose inner seta, and longitudinal row of outer setules; enp-2 with 1 plumose inner seta and strong outer spinules; enp-3 with 2 bipinnate outer spines, 3 long setae, and 1 short spine on distal corner, with outer strong spinules as depicted.

P2 ( Figure 6 View Figure 6 (a)). Praecoxa without ornamentation. Coxa with medial rows of spinules on anterior surface, with 1 inner coxal seta. Basis with spinulose outer seta, inner margin with small sharp process distally. Exopod 3-segmented; exp-1 with bipinnate outer spine, with strong spinules; exp-2 with 1 serrate outer spine and 1 plumose inner seta; exp-3 with 3 outer spines, 1 apical spinulose spine, and 3 plumose inner setae. Endopod 3-segmented; enp-1 smallest, with 1 plumose inner seta, anterior surface produced into long mucroniform process, reaching distal margin of enp-2; enp-2 with 1 plumose inner seta and outer spinular rows as shown; enp-3 with 1 outer spine, 2 distal spines, and 1 inner seta.

P3 ( Figure 7 View Figure 7 (a)). Praecoxa without ornamentation. Coxa with strong outer spinules and with inner spinulose seta. Basis with 1 spinulose outer seta, with minute spinules distally. Exopod 3-segmented; exp-1 with 1 serrate outer spine and strong outer spinules; exp-2 with 1 serrate outer spine, 1 plumose inner seta, with strong outer spinules; exp-3 with 2 outer spines, 2 distal spines, and 1 inner seta. Endopod 3-segmented, much longer than exopod; enp-1 and enp-2 with 1 inner plumose seta, and strong outer spinules; enp-3 with 1 outer spine, 2 distal elements, and 1 inner seta.

P4 ( Figure 7 View Figure 7 (b)). Praecoxa without ornamentation. Coxa with 1 small inner bare seta and several outer spinules. Basis with outer spinulose seta, with minute spinules close to joint with endopod. Exopod 3-segmented; exp-1 with 1 outer pinnate seta and dense patch of outer spinules; exp-2 with 1 outer and 1 inner spinulose seta, with dense patch of spinules; exp-3 with 1 outer pinnate seta, 2 apical spinulose elements, and 1 inner spinulose seta, with spinules as shown. Endopod 3-segmented; enp-1 shortest, with 1 inner spinulose seta and some spinules as shown; enp-2 unarmed, with dense patch of spinules; enp-3 with 2 outer spines and 2 distal spinulose setae. Seta and spine formula of swimming legs of the new species as shown in Table 1.

P5 ( Figure 2 View Figure 2 (b)). Vestigial, incorporated into somite; with 2 pinnate and 2 setulose setae; innermost shortest, second innermost one longest, and outermost one separated from the others.

Description of the adult male (allotype)

Allotype ( Figure 1 View Figure 1 (b)) slightly smaller and slender than the female. Total body length 1.17 mm. Sexual dimorphism in the antennule, P4, P5, genital somite and caudal ramus. Urosome ( Figure 8 View Figure 8 (b)) 5-segmented, comprising P5-bearing somite (omitted in Figure 8 View Figure 8 (b)), genital somite, 3 free abdominal somites. Genital somite largest, with dense patch of tiny spinules as figured, with paired lateral, posteriorly directed pointed extensions.

Antennule ( Figure 3 View Figure 3 (f), 3(g)) short, 4-segmented. First segment longest and broadest, with posterior patch of setules, with 22 setae and 2 aesthetascs; second segment shortest with 3 setae; third segment with 8 setae; distal segment with 7 apical setae. Armature formula: 1-(22 + 2ae), 2-(3), 3-(8), 4-(7).

Antenna, mandible, maxillule, maxilla, maxilliped, P1, P2 and P4 as in female.

P3 as in female, except for inner border of enp-3, with small, transparent modified tube-pore on inner margin ( Figure 6 View Figure 6 (b)).

P5 ( Figure 8 View Figure 8 (c)) with armature as in female, except for longer outer basal seta.

P6 ( Figure 8 View Figure 8 (b), 8(d)) represented by 1 posteriorly directed pointed projection covered with tiny spinules, with 1 proximal long bare seta, and 1 subapical element ( Figure 8 View Figure 8 (d)).