Porirualia ngankeeae Ma, Wu & Li, 2024, sp. nov.
Creators: name: Ma, Lin
name: Wu, Yihong
name: Li, Xin Zheng
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Copepoda
Harpacticoida
Parastenheliidae
Porirualia
Porirualia ngankeeae

description: Porirualia ngankeeae sp. nov.
(Figs. 1–7)
Type material. Holotype: MBM189275, female dissected on three slides, China, the Yellow Sea, Qingdao, No. 1 Bathing Beach, 36°3’18”N, 120°20’20”E, intertidal zone, fine sand, 15 September 2021. Allotype: MBM189276, male dissected on three slides, collected with holotype. Paratypes: MBM189277, 1 female dissected on five slides, collected with holotype; MBM189278, 1 female dissected on three slides, collected with holotype; MBM189279, 1 female (DNA amplification successful) dissected on three slides, collected with holotype; MBM189280, 1 female dissected on three slides, collected with holotype; MBM189281, 1 male dissected on three slides; MBM189282, 1 male dissected on two slides, collected with holotype.
Other material examined. MBM189283, 3 females and 1 male, collected from type locality and preserved in 75 % ethanol.
Etymology. The species is named in honour of our very good and kind friend and colleague, the late Singapore carcinologist, Dr. Ngan Kee NG, for her great works in brachyuran crustacean taxonomy and systematics.
Description of female. Total body length, measured from anterior margin of rostrum to posterior margin of caudal rami, ranging from 542 to 587 μm (mean = 563 μm; n = 5).
Habitus (Figs. 1B, 2A–B). Fusiform, urosome usually curved to prosome dorsally. All prosomites with sensillae as illustrated. Somites with conspicuous pores as figured. Rostrum (Fig. 1A) defined at base, elongated and rounded apically, directed downward, with paired sensillae located near apex. Urosomites with obvious hyaline frills all around posterior margin. Genital somite ornamented with spinule rows on posterior margin dorsally; genital field with large copulatory pore and several spinule rows; genital apertures covered by vestigial P6 bearing three setae, inner two short, outer one long and plumose.Anal operculum semicircular, bordered with fine spinules. Caudal ramus wider than long, with conspicuous spinular ornamentation; bearing seven setae, setae I and II naked, positioned ventrally near outer margin, seta III slender, longer than seta VI, originating from pedestal at outer distal corner, setae IV–V longest and bipinnate, seta VI slender and naked, issued at inner distal corner, seta VII triarticulated at base, arising from dorsal surface.
Antennule (Fig. 1A). Nine-segmented; segment 1 longest, surface of all segments smooth; with aesthetascs on fourth and distal segment. Armature formula: 1-[1], 2-[7], 3-[9], 4-[1 + (2 + aes)], 5-[2], 6-[3], 7-[2], 8-[1], 9-[3 + (3 + aes)].
Antenna (Fig. 3A).Allobasis with three spinules along outer margin; with one subdistal abexopodal seta. Exopod two-segmented; first segment with two setae, one subdistal and one distal; second segment with two lateral setae and three apical setae. Endopod one-segmented, with two transversal rows of spinules on anterior and posterior surface respectively, three inner spinules along inner margin and some outer spinules subdistally; bearing nine elements: two small naked and one large unipinnate spines subdistally, two slender and naked setae distally, two geniculate apical setae, one spinose and one naked apical setae fused at base.
Labrum (Fig. 3B). Almost triangular, with many spinules around pointed apex.
Mandible (Fig. 3C). Gnathobase well developed, bearing several multicuspidate teeth along distal margin and one seta at dorsal corner. Basis elongated, carrying two plumose setae and bulbous seta distally. Endopod one-segmented, bearing seven setae as figured. Exopod much smaller than endopod, bearing three plumose setae.
Maxillule (Fig. 3D). Arthrite with two lateral setae, seven apical teeth, and two setae on anterior surface. Coxal endite with six setae and epipodite represented by one plumose seta. Basis with five apical setae. Endopod and exopod one-segmented, bearing three and two setae respectively.
Maxilla (Fig. 3E). Syncoxa ornamented with several setules along outer margin; with three endites, proximal endite bilobate with one naked setae on inner cusp and one plumose seta on outer cusp, middle endite with three setae, and outer endite with two pinnate setae. Allobasis with one strong claw bearing two naked setae. Endopod one-segmented, with two slender setae.
Maxilliped (Fig. 3F). Syncoxa with two rows of spinules on surface and three setae subdistally. Basis with three spinule rows on palmar surface and one seta on medial margin. Endopod represented by one strong and unipinnate claw; bearing two accessory, naked setae.
P1 (Fig. 4A). Intercoxal sclerites smooth. Praecoxa narrow, with two rows of spinules subdistally. Coxa with several rows of spinules as figured. Basis almost trapezoidal, with one pinnate outer spine, one unipinnate inner spine, few spinules on surface, distal and inner margins. Exopod three-segmented, first segment with one spine and many spinules along outer margin; second segment slightly longer than first, with one tiny seta on inner distal corner (see arrow in Fig. 4A); distal segment with two outer spines, one geniculate seta and one plumose seta apically. Endopod two-segmented; proximal segment strikingly elongated, about 4.8 times as long as greatest width, overreaching apex of exopod, with one pinnate inner seta inserted proximally 1/4; distal segment slightly longer than wide, bearing one bare seta and two pinnate spines.
P2 (Fig. 4B). Intercoxal sclerite unornamented, almost trapezoidal. Praecoxa triangular, with one row of spinules distally. Coxa almost rectangular, with one row of spinules on anterior surface close to outer margin. Basis with naked outer seta, few spinules on subdistal margin, row of long spinules close to proximal inner margin. Exopod three-segmented, all segments with few spinules along outer margin, one outer unipinnate spine and one inner seta, respectively; second segment about equal to first; distal segment about 1.3 times as long as second. Endopod three-segmented; proximal segment short, with one weak seta (see arrow in Fig. 4B) on inner margin; second segment about 1.4 times as long as proximal, with one inner plumose seta; distal segment about 1.6 times as long as proximal, with one inner plumose seta, one plumose seta and one spine distally, one outer spine; all segments with few setules on inner margin, several spinules along outer margin.
P3 (Fig. 5A). Intercoxal sclerites smooth, with two distal blunt projections. Praecoxa narrow, with one row of spinules distally. Coxa with two rows of spinules on outer margin. Basis with naked outer seta, row of spinules on inner, subdistal and outer margins, respectively. Exopod three-segmented; first segment with few setules and one naked seta on inner margin, few large spinules and one unipinnate spine on outer margin; second segment similar as first, except inner seta plumose; distal segment about 1.5 times as long as second, with two plumose and one small inner setae, one plumose seta and one unipinnate spine apically, three unipinnate spines and several spinules along outer margin. Endopod three-segmented; proximal segment short, with one plumose seta and several setules on inner margin; second segment longer than first, with one long plumose seta and several setules on inner margin; distal segment about 1.6 times as long as second, with one pore on anterior middle surface close to distal margin, bearing two plumose inner setae, one plumose seta and one spinulose spine apically, one unipinnate outer spine; all segments with few spinules on outer margin.
P4 (Fig. 5B) Intercoxal sclerites smooth, with two distal blunt projections. Praecoxa narrow, with one row of spinules on anterior surface. Coxa slightly broader than long, with two rows of spinules on anterior surface and one row of spinules on posterior surface. Basis with one row of subdistal spinules and long, naked, outer seta. Exopod three-segmented; first segment with few small spinules and one naked seta on inner margin, few large spinules and one unipinnate spine on outer margin; second segment as long as first, with one plumose seta and few setules along inner margin, one unipinnate spine and few spinules on outer margin; distal segment about 1.4 times as long as second, with two plumose and one small inner setae, one plumose seta and one unipinnate spine apically, three unipinnate spines and several spinules along outer margin. Endopod three-segmented; proximal segment short, with one plumose seta and several setules on inner margin; second segment longer than first, with one long plumose seta and several setules on inner margin; distal segment about 1.6 times as long as second, with one pore on anterior middle surface close to distal margin, bearing two plumose inner setae, one plumose seta and one spinulose spine apically, one unipinnate outer spine; all segments with few spinules on outer margin.
P5 (Fig. 7A–B). Baseoendopods not fused medially. Baseoendopodal lobe extending to almost a proximal quarter of exopod, with five elements (two strong unipinnate spines, two pinnate setae, one slender and naked seta). Exopod elongated, about 3.83 times as long as greatest width, with two outer bipinnate, two subdistal (one bipinnate, one small and naked) and two distal setae (one bipinnate, one slender and naked).
Description of male. Total body length, measured from anterior margin of rostrum to posterior margin of caudal rami, ranging from 420 to 461 μm (mean = 446 μm; n = 3).
Habitus (Figs. 1C, 6A–B). Smaller than female; generally as in female, except third and fourth prosomites bearing spinules along distal margin, second urosomite with continuous distal hyaline frills on dorsal surface and less spinules on ventral surface.
Antennule (Fig. 7F). Haplocer, 11-segmented, fifth segment slightly swollen; surface of all segments smooth; with aesthetasc on fifth and apical segments. Armature formula: 1-[1], 2-[3], 3-[5], 4-[4], 5-[3 + (1 + aes)], 6-[2], 7-[0], 8-[1], 9-[4], 10-[5], 11-[3 + aes].
Antenna, mandible, maxillule, maxilla, maxilliped, P1 and P4 as in female.
P2 (Fig. 7C). Exopod as in female. Endopod two-segmented, first segment with one minute inner seta; second segment with two inner setae (one naked and one plumose), one plumose seta and one bipinnate spine apically, one outer spine; all segments with few spinules along outer margin.
P3 (Fig. 7D). Exopod as in female. Endopod two-segmented, first segment with one inner seta; second segment with two inner setae, one plumose seta and one bipinnate spine apically, one outer spine; all segments with few spinules along outer margin.
P5 (Fig. 7E). Baseoendopodal lobe extending to almost proximal 3/4 of exopod, confluent on middle of its inner portion, with one spinulose seta and one dwarf seta. Exopod rectangular, bearing five elements (two apical bipinnate spines, one slender and bare seta, two bipinnate outer spines).
P6 (Fig. 6B). Bearing three setae, of which inner one shorter, middle one and outer one almost equal.
description: Published as part of Ma, Lin, Wu, Yihong & Li, Xin Zheng, 2024, A new species of the genus Porirualia Huys & Mu, 2021 (Copepoda, Harpacticoida, Parastenheliidae) from the intertidal zone of Qingdao, China, with a key to species of the genus, pp. 241-252 in Zootaxa 5476 (1) on pages 242-248, DOI: 10.11646/zootaxa.5476.1.21, http://zenodo.org/record/12726987