Huntemannia doheoni, Song, Sung Joon, Rho, Hyun Soo & Kim, Won, 2007

Song, Sung Joon, Rho, Hyun Soo & Kim, Won, 2007, A new species of Huntemannia (Copepoda: Harpacticoida: Huntemanniidae) from the Yellow Sea, Korea, Zootaxa 1616, pp. 37-48 : 38-44

publication ID	https://doi.org/ 10.5281/zenodo.179114
DOI	https://doi.org/10.5281/zenodo.5698285
persistent identifier	https://treatment.plazi.org/id/03C6C114-FFFC-3C21-FF79-FC46FBA2F979
treatment provided by	Plazi
scientific name	Huntemannia doheoni
status	sp. nov.

Treatment

Huntemannia doheoni , new species

( Figs 1–6 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 )

Material examined. Holotype, ovigerous female in alcohol (reg. No. NMNH 1080685) coll. Sung Joon Song, 24 May 2001. Allotype, one male dissected on 15 slides (reg. no. IRBKR 003494). Paratypes, 7 females (4 ovigerous) and 10 males preserved in alcohol (reg. No. NMNH 1080686); 1 female dissected on 15 slides (reg. no. IRBKR 003481); 5 females and 6 males on a SEM stub (reg. no. IRBKR 003495); collection data as for holotype.

Other material. 6 females (1 ovigerous), 4 males and 6 juveniles collected from a sandy beach at Daecheon, Chungchungnam-do coll. Sung Joon Song, 20 May 2004; 4 females, 10 males and 12 juveniles collected from a sandy bottom at Baeal Island (Estuary of Seomjin River), Kwangyang City, coll. Sung Joon Song, 9 May 2006.

Type locality. Seungbong Island (371008N, 1261735E), the Yellow Sea of Korea; muddy sand flat in seagrass bed ( Zostera japonica ).

Description of female. Total body length 684 m, measured from anterior margin of rostrum to posterior margin of caudal rami. Largest width measured at posterior margin of cephalic shield: 205.4 m. All prosomites and urosomites with crenulated posterior margin ( Fig. 1 View FIGURE 1 A), except for anal somite with smooth margin. Urosome gradually tapering posteriorly, with 2 egg sacs attached. Cephalothorax ornamented with a few integumental sensilla and pores as figured ( Fig. 1 View FIGURE 1 A). Many depressions present on mid-surface. Pleural areas well developed and rounded without lobate posteolateral angles. Rostrum ( Fig. 1 View FIGURE 1 B) large, triangular and directed downward, with middorsal paired sensilla and numerous setules located near apex. Pedigerous somites and urosomites ( Figs 1 View FIGURE 1 A, 2A) covered with tiny spinules. Body constricted between individual somites.

Urosome ( Figs 1 View FIGURE 1 A, 2A) 5-segmented, comprising P5-bearing somite, genital double-somite and 3 free abdominal somites. Genital double-somite ( Figs 1 View FIGURE 1 A, 2A) wider than long, with transverse surface ridge dorsally and laterally, indicating original segmentation; completely fused ventrally. Genital field ( Fig. 3 View FIGURE 3 E) positioned anteriorly with very small copulatory pore located in median depression. P6 ( Fig. 3 View FIGURE 3 E) with seta on small protuberance. Anal somite ( Fig. 1 View FIGURE 1 A) with pair of dorsal sensilla anterior to operculum. Caudal rami ( Figs 1 View FIGURE 1 A, 2A) longer than wide; whole surface covered with tiny spinules, each ramus with 7 setae; setae I and II bare and subequal in length, setae III, IV and VI bare, seta V fused basally and directed outward, distal half of seta V pinnate along inner margin, and largest, seta VII tri-articulate at base.

Antennule ( Fig. 1 View FIGURE 1 C) 5-segmented; segment 1 longest with small, bare seta at distal anterior margin; segment 3 with aesthetasc fused basally to bare seta on pedestal at distal end; segment 4 shortest. Armature formula: 1-[1], 2-[2 bare + 3 spinulose + 4 pinnate], 3-[5 spinulose + 1 pinnate + (1 bare + ae)], 4-[1 spinulose], 5-[2 bare + 3 spinulose + 2 pinnate + trithek].

Antenna ( Figs 1 View FIGURE 1 D–E, 6A) with allobasis and free 1-segmented endopod. Allobasis elongate with spinular row and bipinnate abexopodal seta in distal quater. Endopod slightly shorter than allobasis, ornamented with spinules along outer margin and 2 transverse hyaline frills subapically. Lateral armature consisting of 2 spines. Distal armature consisting of 3 spines and 1 serrated seta. Exopod 1-segmented, bearing 4 long setae.

Labrum with elaborate spinular ornamentation and paragnaths well developed lobes; with ornamentation pattern in Fig. 5 View FIGURE 5 B.

Mandible ( Fig. 2 View FIGURE 2 B) with well-developed gnathobase bearing several multicuspidate teeth on distal margin and unipinnate seta on distal corner; 3 spinular rows on surface. Palp small, exopod and endopod fused to basis, bearing 1 long, bare seta and 1 small seta on outer peduncle and 2 plumose setae on distal peduncle respectively.

Maxillule ( Fig. 2 View FIGURE 2 C). Praecoxa with few spinules around inner and outer margins. Arthrite strongly developed, with pinnate seta on inner margin, 2 naked setae on anterior surface, and 7 spines/setae around distal margin. One row of spinules on posterior surface. Coxa with cylindrical process bearing 2 long, pinnate setae. Exopod and endopod fused to basis, with 3 naked setae on outer margin and 4 setae on distal margin.

Maxilla ( Fig. 2 View FIGURE 2 D). Syncoxa fused to allobasis, with row of spinules on inner surface, cluster of spinules midlength, and 2 endites on syncoxa. Two endites each with 3 ornamented spines (innermost 1 fused to base). Proximal endite with few spinules on surface. Allobasis drawn out into unipinnate claw; accessory armature consisting of bare seta and 3 spinules on posterior surface. Endopod represented by small protuberance bearing 2 long, bare setae.

Maxilliped ( Fig. 2 View FIGURE 2 E) with pinnate seta and 3 rows of setules and row of spinules on syncoxa. Basis with 2 rows of setules along outer and anterior surface, and row of setules apically. Endopod drawn out into long, unipinnate claw, with 2 long, bare setae.

P1 ( Fig. 5 View FIGURE 5 A). Coxa with 2 rows of spinules on anterior surface and strongly developed, hook-like process on outer distal corner. Basis broad oval form with 3 spinular rows of spinules on anterior surface of protuberances; outer spine stout and inner spine represented by small protuberances bearing 3 or 4 spinules apically. Exopod 3-segmented; exp-1 and exp-2 with 2 spinular rows on subdistal surface and stout spine respectively; exp-3 with spinular row on anterior surface and with stout spine, bipinnate spine, bare seta and long seta ornamented with hairs distally, as shown in Fig. 5 View FIGURE 5 A. Endopod 1-segmented and widened distally, with many spinules on anterior surface and 2 stout spines apically.

P2–P4 ( Fig. 3 View FIGURE 3 A–C) with wide intercoxal sclerites lacking ornamentation. Praecoxae weakly developed. Coxae with several spinules on outer distal corner. Bases transversely elongated; with anterior pore in proximal third; with fine setules on anterior surface; outer distal setae bipinnate (P2, P4) or bare (P3). Exopod 1- segmented and bilobed; with vestigial suture line as junction of 2 segments; with 3 bipinnate setae. Endopod small and slightly tapering, with setules on anterior surface; with bipinnate seta (P2 with bare seta).

P5 ( Fig. 3 View FIGURE 3 D) not fused to supporting somite; rami separate and scattered tiny setules on the whole anterior surfaces as figured. Baseoendopod transversely elongated, with setule line along inner margin. Endopodal lobe extending to distal third of exopod, with 3 semiplumose setae and 1 plumose seta. Exopod longer than wide, with setules along inner and outer margins; with 3 plumose setae, 1 bipinnate and 1 bare seta, and each seta arising from distinct cylindrical process.

Description of male. Total body length 1146 m measured from anterior margin of rostrum to posterior margin of caudal rami. Largest width measured at middle margin of cephalic shield: 372.3 m. Prosome 4-segmented, comprising cephalothorax and 3 free pedigerous somites. Cephalothorax ( Figs 4 View FIGURE 4 A, 6A) with smooth posterior margin; swollen middle area, ornamented with a few integumental sensillae and pores as figured. Pleural areas and rostrum as in female. Pedigerous somites ornamented with sensillae and a few pores; P4- bearing somite with crenulated posterior margin.

Urosome ( Fig. 4 View FIGURE 4 A–B) 6-segmented, comprising P5-bearing somite, genital somite and 4 abdominal somites. All somites ornamented with small spinules dorsally and ventrally, with crenulated posterior margin except anal somite. Spermatophore small, as long as P5-bearing somite. Caudal rami ( Fig. 4 View FIGURE 4 A–B) similar to female in appearance; whole surface covered with tiny spinules, each ramus with 7 setae; setae I and II bare and subequal in length, setae III bipinnate, seta IV fused basally and directed inwardly, seta V long bipinnate, seta VI bare and longest, seta VII tri-articulate at base.

Antennule ( Figs 4 View FIGURE 4 C–E, 6B) 6-segmented; subchirocer, with geniculation between segment 4 and 5. Segment 1 longest, with small, bare seta and spinular row at distal anterior margin. Segment 4 smallest and represented by small sclerite. Segment 5 swollen. Segment 6 with triangular distal half. Armature formula: 1-[1], 2- [1 spinulose + 2 bare + 6 pinnate], 3-[1 spinulose + 2 pinnate + 4 bare], 4-[2 bare], 5-[1 pinnate + 10 bare + (1 bare + ae)], 6-[5 bare + trithek].

Antenna, mouth appendages, P1 and P2 as for female.

P3 ( Fig. 5 View FIGURE 5 C) with wide intercoxal sclerites, without ornamentation. Praecoxa small, lacking setules or spinules. Coxa with spinular row posteriorly. Basis widened, with spinules on inner lobe; with anterior tubepore midlength outer distal seta bipinnate. Exopod 2-segmented; exp-1 shorter than exp-2; with lines of tiny spinules along outer margin and bare seta on distal corner; exp-2 slightly widened distally ornamented with spinules on outer margin, bearing modified spine distally and 2 bipinnate setae subdistally. Endopod 1-segmented and narrow, with 2 bipinnate setae.

P4 ( Fig. 5 View FIGURE 5 D) with wide intercoxal sclerites, without ornamentation. Praecoxa small. Coxa transversely elongated with spinules on outer and inner distal surface. Basis widened with spinules on inner lobe; with anterior tube-pore near middle; outer distal seta bipinnate. Exopod 2-segmented; exp-1 with tiny spinules on outer surface and on inner distal lobe; and bearing long, bare seta; exp-2 as long as exp-1, with modified strong spine distally four-tipped. Endopod 1-segmented and narrow distally, without ornamentation on surface, with bipinnate seta.

P5 ( Figs 5 View FIGURE 5 E, 6D) confluent exopod and baseoendopod, with tiny spinules on surface; represented by 3 lobes; exopodal lobe with 4 bipinnate setae, second outermost one is longest; baseoendopodal lobe with 4 setae.

P6 ( Figs 5 View FIGURE 5 F, 6D) represented by well-developed lobe bearing 2 plumose setae, distalmost longest, and 1 spine.

Variability. Female: 583.4–758.9 m (mean=651.4 m; n=21), Male 643.5–1173.0 m (mean=842.0 m; n=19).

P3 endopod of male usually possesses two distal setae as in all species of Huntemannia , but one male among 25 males studied have only one seta distally. A non-modified, outer distal seta on P4 exopod fused to two segments has also been observed in male. No variability was observed in females.

Etymology. The species is named in honour of Dr. Do Heon Kwon, Inje University of South Korea who made outstanding systematic contributions in the field of terrestrial Isopoda.