Limnoria rhombipunctata Yoshino, Watabe & Ohsawa, 2017

Song, Ji-Hun, Park, Taeseo, Kim, Won & Min, Gi-Sik, 2017, Arcturina serrulatus sp. nov. and a new record of Limnoria rhombipunctata (Crustacea: Malacostraca: Isopoda) from South Korea, Zootaxa 4286 (3), pp. 411-424 : 418-421

publication ID

https://doi.org/ 10.11646/zootaxa.4286.3.8

publication LSID

lsid:zoobank.org:pub:90B41B38-7AAE-4F3E-818B-ED36A7CFF007

DOI

https://doi.org/10.5281/zenodo.3510416

persistent identifier

https://treatment.plazi.org/id/03DE87EF-9345-C141-3FC7-FDDBFE93F844

treatment provided by

Plazi

scientific name

Limnoria rhombipunctata Yoshino, Watabe & Ohsawa, 2017
status

 

Limnoria rhombipunctata Yoshino, Watabe & Ohsawa, 2017

Figs 6–10 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10

Limnoria rhombipunctata Yoshino, Watabe & Ohsawa, 2017: 251 View Cited Treatment –259, figs 1–3.

Material examined. 1 female (NIBRIV0000470351) ( Figs 6 View FIGURE 6 A–C & 7A, B), total length 6.8 mm, Goraebawi (Whale rock, Diving point), Oho-ri , Jugwang-myeon , Goseong-gun, Gangwon-do, South Korea, 38°19'39''N, 128°33'45''E, 10 m, SCUBA diving and rinsing Zostera sp., 28 November 2012, coll. T. Park & Y. Eun GoogleMaps . 1 female (NIBRIV0000470352), total length 4.5 mm, same location and collectors as above. GoogleMaps

Description. Female. Body ( Figs 6 View FIGURE 6 A–C & 7A, B) oblong, about 3.4 times as long as greatest width; surface covered with thin setae. Head globular, frontal margin slightly concave. Pereonite 1 longest; 2–5 similar length; 7 shortest. Coxae of pereonites 2–7 large, well visible dorsally. Pleonites 1–4 posterior margins with transverse ridges. Pleonite 5, 0.9 times as long as pleotelson dorsally, with anterior transverse carina and 3 distinctively large nodes, each node surrounded by thin setae. Pleotelson with 1 large median node, followed posteriorly by 2 pairs of carinae, and laterally with 1 more pair of short carinae; posterior margin of pleotelson fringed with stout setae between which are short scale spikes; lateral crests without tubercles. Colour ( Fig. 6 View FIGURE 6 A–C) dark yellow in ethanol.

Antennula ( Fig. 7 View FIGURE 7 C) with 3 flagellar articles; second articles with about 6 aesthetascs. Antenna ( Fig. 7 View FIGURE 7 D) with 4 flagellar articles. Right mandible ( Fig. 8 View FIGURE 8 A) palp with 3 articles; incisor beak-like; lacinia mobilis apically bifurcate. Maxillula ( Fig. 8 View FIGURE 8 B), outer lobe with 7 apical pectinate spines, lateral margin with simple setae; inner lobe with 3 stout pappose setae. Maxilla ( Fig. 8 View FIGURE 8 C) comprises 3 lobes. Maxilliped ( Fig. 8 View FIGURE 8 D) palp with 5 articles, distal article smallest; apex of endite with 5 pappose setae and 1 stout seta, inner margin with 1 coupling hook; epipod narrowed distally, triangular, reaching past palp articulation.

Pereopod 1 ( Fig. 9 View FIGURE 9 A) ischium without tubercles and ventral comb seta; merus with 5 tubercles, without ventral comb seta; carpus with 2 tubercles, without ventral comb seta; propodus inferodistal margin with 2 comb setae. Pereopod 2 ( Fig. 9 View FIGURE 9 B) ischium with 1 tubercle; merus and carpus with 2 tubercles, with 1 ventral comb seta, respectively; Pereopod 3 ( Fig. 9 View FIGURE 9 C) ischium with 2 tubercles; merus with 2 tubercles and 1 ventral comb seta; carpus with 2 tubercles, without ventral comb seta. Pereopod 4 ( Fig. 9 View FIGURE 9 D) smallest; ischium with 2 tubercles; merus and carpus with 2 tubercles and 1 ventral comb seta, respectively. Pereopod 5 ( Fig. 9 View FIGURE 9 E) ischium with 1 tubercle; merus and carpus with 2 tubercles and 1 ventral comb seta, respectively. Pereopod 6 ( Fig. 9 View FIGURE 9 F) ischium with 1 tubercle; merus with 2 tubercles and 7 ventral comb setae; carpus with 2 tubercles and 5 ventral comb setae. Pereopod 7 ( Fig. 9 View FIGURE 9 G) longest; merus with 15 ventral comb setae; carpus with 10 ventral comb setae. All pereopods with bifid secondary unguis.

Pleopod 1 ( Fig. 10 View FIGURE 10 A) peduncle with 3 coupling hooks on inner margin; both rami with numerous plumose setae. Pleopod 2 ( Fig. 10 View FIGURE 10 B) peduncle with 2 coupling hooks; both rami with plumose setae up to 0.4 times as long as exopod. Pleopods 3 and 4 ( Fig. 10 View FIGURE 10 C, D) peduncle with 2 coupling hooks. Pleopod 5 ( Fig. 10 View FIGURE 10 E) peduncle and both rami without seta. Uropod ( Fig. 10 View FIGURE 10 F) peduncle with 3 distolateral tubercles; endopod 0.6 times as long as peduncle; exopod short, 0.4 times as long as endopod, claw well developed.

Molecular data. The CO1 sequences obtained from the materials of L. rhombipunctata were deposited in GenBank (accession numbers: KX236457 View Materials and KX236458 View Materials ).

Habitat and ecology. Limnoria rhombipunctata , a seagrass borer, was collected from a seagrass-covered sea bottom, 10 m in depth.

Substrate. The rhizome of Phyllospadix iwatensis (type locality, Japan) and Zostera sp. ( South Korea ), respectively.

Distribution. Japan ( Yoshino et al. 2017), eastern coast of South Korea (this study).

Remarks. To date, Limnoria includes six seagrass-boring species, i.e. L. agrostisa Cookson, 1991 , L. mazzellae Cookson & Lorenti, 2001 , L. raruslima Cookson, 1991 , L. rhombipunctata , L. simulata Menzies, 1957 , and L. zinovae ( Kussakin, 1963) . Among them, L. rhombipunctata was described based on male specimens collected from the rhizomes of Phyllospadix iwatensis (seagrass) in Japan. Herein, this species is described based on female specimens collected from the rhizomes of Zostera sp. (seagrass) in South Korea. The morphology of the specimens of L. rhombipunctata collected from South Korea agrees well with the illustrations and description of Yoshino et al. (2017); however, we found some sexual dimorphisms in the Korean specimens as follows: (1) maxillipedal epipod with simple setae (vs. maxillipedal epipod without simple setae in the original description); and (2) more numerous setae on pereopods (vs. few setae on pereopods in the illustration of the original description).

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Isopoda

Family

Limnoriidae

Genus

Limnoria

Loc

Limnoria rhombipunctata Yoshino, Watabe & Ohsawa, 2017

Song, Ji-Hun, Park, Taeseo, Kim, Won & Min, Gi-Sik 2017
2017
Loc

Limnoria rhombipunctata

Yoshino 2017: 251
2017
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