Polyankylis bogilensis, Lee & Chang & Kim, 2022

Lee, Jimin, Chang, Cheon Young & Kim, Il-Hoi, 2022, Symbiotic copepods (Cyclopoida and Siphonostomatoida) collected by light trap from Korea, ZooKeys 1115, pp. 1-71 : 1

publication ID

https://dx.doi.org/10.3897/zookeys.1115.83266

publication LSID

lsid:zoobank.org:pub:C3E233F1-0EF7-4D2D-BD4A-A32AE7C4DF5E

persistent identifier

https://treatment.plazi.org/id/DCF49374-198A-4824-910A-45D3C72A4C81

taxon LSID

lsid:zoobank.org:act:DCF49374-198A-4824-910A-45D3C72A4C81

treatment provided by

ZooKeys by Pensoft

scientific name

Polyankylis bogilensis
status

sp. nov.

Polyankylis bogilensis sp. nov.

Figs 18 View Figure 18 , 19 View Figure 19

Material examined.

Holotype ♀ (MABIK CR00250129) dissected and mounted on a slide, Site 22 (Yesong, Bogil Island, south coast, 34°08'11"N, 126°33'49"E), 31 May 2021, leg. J. Lee. GoogleMaps

Description.

Female. Body (Fig. 18A View Figure 18 ) dorsoventrally flattened. Body length 1.10 mm. Prosome 1.54 × longer than wide (570 × 370 μm). Cephalothorax with faint dorsal suture line between cephalosome and first pedigerous somite, with rounded posterolateral corners. Second to fourth pedigerous somites with rounded anterolateral and posterolateral corners. Urosome (Fig. 18B View Figure 18 ) six-segmented. Fifth pedigerous somite 155 μm wide, slightly wider than genital double-somite. Genital double-somite 1.15 × longer than wide (170 × 148 μm), widest at proximal third of double-somite; posterior two-thirds gradually narrowing posteriorly; genital apertures positioned dorsolaterally at widest region of double-somite. Three free abdominal somites 70 × 93 μm, 56 × 86 μm, and 90 × 90 μm, respectively. All urosomal somites smooth, unornamented. Caudal rami straight backwards, rectangular, isolated from each other; each ramus (Fig. 18C View Figure 18 ) 2.96 × longer than wide (80 × 27 μm), armed with six setae (seta II-VII); seta II positioned dorsally at 45% region of ramus length; seta V much longer than other caudal setae; seta III feebly pinnate, other five setae naked.

Rostrum (Fig. 18A, D View Figure 18 ) as broad, spatulate anterior prominence of cephalothorax. Antennule (Fig. 18E View Figure 18 ) 295 μm long, six-segmented, gradually narrowed distally; armature formula 2, 7, 6 (or 2. 6, 7), 4+aesthetasc, 2+aesthetasc, and 7+aesthetasc; all setae naked. Antenna (Fig. 18F View Figure 18 ) four-segmented; first segment (coxobasis) with one seta at inner distal corner; second segment (first endopodal segment) longest, armed with one seta on inner margin and ornamented with setules on outer margin; short third segment with one small claw and two very unequal setae; terminal segment 1.28 × longer than wide (23 × 18 μm), distally armed with three claws of different lengths and three unequal setae, including minute outermost seta, and ornamented with minute spinules on subdistal outer margin.

Labrum (Fig. 18G View Figure 18 ) bilobed, with deep median incision and proximal sclerotization band; each lobe distinctly longer than wide (~ 41 × 25 μm), divided from proximal part by weak suture line, with uneven outer margin. Mandible (Fig. 18H View Figure 18 ) with two very unequal outer scales (spiniform proximal one and large, plate-like distal one) followed by stout tubercle; inner margin short, with circular row of spinules at junction between distal lash and inner margin; distal lash short, denticulate along outer margin, with fine denticle along inner margin; terminal part of lash not flexible. Maxillule (Fig. 18I View Figure 18 ) lobate, armed with four setae; larger distal three setae pectinate along their inner margin; smaller inner margin seta naked, not articulated at base. Maxilla (Fig. 18J View Figure 18 ) two-segmented; proximal segment (syncoxa) broad, with one claw-like cusp on proximal part of posterior surface; distal segment (basis) armed with two spiniform setae (setae I and II), terminating in short, spiniform distal lash bearing four spines followed by one or two denticles along outer margin; seta I (inner seta) large, spinulose, proximal six spinules markedly larger than other spinules on seta; seta II (anterior seta) distally unequally bifurcate, with row of spinules, proximal four or five of these spinules much larger than distal spinules. Maxilliped (Fig. 19A View Figure 19 ) three-segmented; first segment (syncoxa) unarmed; second segment (basis) broadened, armed with two large setae distantly isolated from each other: proximal seta spiniform, curved, extending to distal tip of maxilliped, ornamented with three kinds of spinules, eight extremely long spinules on proximal part of inner margin followed distally by minute spinules and row of several small spinules along outer margin; distal seta straight, less than half as long as proximal seta, feebly spinulose along both margins; terminal segment (endopod) distally forming spinulose claw, proximally with one spine, one dentiform process and one small seta.

Leg 1-3 (Fig. 19B-D View Figure 19 ) biramous, each with three-segmented exopod and two-segmented endopod; coxa with minute spinules at outer distal corner and large, pinnate inner seta; outer seta on basis naked. Leg 3 dissimilar to leg 2 in having three inner setae (instead of four) on distal endopodal segment. Leg 4 (Fig. 19E View Figure 19 ) uniramous, with distinctly two-segmented exopod; endopod absent; coxa lacking inner seta; spines on exopod elongate. Armature formula for legs 1-4 as follows:

Leg 5 (Fig. 19F View Figure 19 ) consisting of one dorsolateral seta on fifth pedigerous somite and free exopod; exopodal segment 1.72 × longer than wide (31 × 18 μm) armed with one spine (45 μm long) one naked seta (91 μm long). Leg 6 unarmed (Fig. 19F View Figure 19 ).

Male. Unknown.

Etymology.

The name of the new species is taken from the type locality, Bogil Island.

Remarks.

The genus Polyankylis currently consists of three known species: P. orientalis Ho & Kim, 1997, P. australis Karanovic, 2008, and P. ovilaxa . Polyankylis australis is known from Australia ( Karanovic 2008) and the other two from Korea ( Ho and Kim 1997; Kim 2014). These three species are distinguished from P. bogilensis sp. nov. by different features, as follows: P. orientalis has a claw-like distal process on the coxobasis of the antenna (cf. this process absent in P. bogilensis sp. nov.) and a single-segmented exopod of leg 4 (cf. two-segmented in P. bogilensis sp. nov.); P. australis has an aesthetasc on the second endopodal segment of the antenna (cf. this aesthetasc absent in P. bogilensis sp. nov.), the terminal antennal segment is 3.5 × longer than wide (cf. 1.28 × longer than wide in P. bogilensis sp. nov.), and the maxillary syncoxa lacks a claw-like process (cf. this process present in P. bogilensis sp. nov.); and P. ovilaxa has caudal rami which are 4.40 × longer than wide (cf. 2.96 × in P. bogilensis sp. nov.), the terminal antennal segment is 2.5 × longer than wide, and the maxillary syncoxa lacks the claw-like process.