Pheronous donghaiensis Chen and Guo, 2015
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publication ID |
https://doi.org/ 10.12651/JSR.2023.12.1.055 |
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DOI |
https://doi.org/10.5281/zenodo.12803020 |
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persistent identifier |
https://treatment.plazi.org/id/03EF9350-ED51-086A-FF69-F8BDBA6C9D9D |
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treatment provided by |
Felipe |
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scientific name |
Pheronous donghaiensis Chen and Guo, 2015 |
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Pheronous donghaiensis Chen and Guo, 2015 View in CoL
( Figs. 4-6 View Fig View Fig View Fig ; Tables 3 View Table 3 , 4 View Table 4 )
Pheronous donghaiensis Chen and Guo, 2015, p. 156 View in CoL View Cited Treatment , Figs. 4 View Fig , 5 View Fig .
Material examined. One male ( MABIK NA00157738 ), in glycerin on HS slide, was deposited in the nematode collection at the specimen conservation room of the Marine Biodiversity Institute of Korea ( MABIK), Seochun, Korea. Three males ( KIOST NEM - 1 - 2656, KIOST NEM - 1 - 2657, KIOST NEM - 1 - 2658) and three females ( KIOST NEM - 1 - 2659, KIOST NEM - 1 - 2660, KIOST NEM - 1 - 2661), in glycerin on HS slide, were deposited in the nematode collection at the specimen conservation room of the Bio-Resources Bank of Marine Nematodes ( BRBMN), East Sea Research Institute, Korea Institute of Ocean Science & Technology ( KIOST), Korea. All the specimens were collected from Mallipo Beach , Sowonmyeon , Taean-gun , Chungcheongnam-do, Korea, 22 June 2020 (leg. by HS Rho and H Lee) .
Habitat. Intertidal fine sand beach (36°47′15.00″N, 126° 08′29.00″E).
Measurements. See Table 3 View Table 3 for detailed measurements and morphometric ratios.
Description. Males. Body long and cylindrical (2,004 - 2,180 μm long), tapering sharply at posterior extremity ( Fig. 4A View Fig ). Maximum body diameter at mid body level 53 - 55 μm. Cuticle smooth. Head diameter 28 - 30 μm wide, distinctly separated from rest of body by a constriction behind cephalic sensilla. Lip region relatively flatted, with six-minute rounded inner labial papilla. Head sensilla papilliform, six outer labial sensilla (3 μm long) and four cephalic sensilla (3 μm long) arranged in one circle, stout and blunt ( Figs. 4C View Fig , 6A View Fig ). Buccal cavity divided into two parts: anterior one conical shaped and posterior one cylindrical tube-shaped with enfolded cuticularized wall. Four solid curved claw-like teeth present at margin of anterior conical section and inner wall of conical section covered minute denticles in rows ( Figs. 4C View Fig , 6A View Fig ). Amphideal fovea pocket-shaped, about 16 - 18 μm wide, situated at posterior edge of cephalic groove ( Fig. 6B View Fig ). Anterior pharynx region surrounding buccal cavity distinctly swollen; general cylindrical structure posteriorly slightly wider toward end portion. Pharynx cylindrical, 341 - 373 μm long, corresponding body diameter 47 - 50 μm. Nerve ring located on 142 - 149 μm from anterior end, corresponding body diameter 42 - 44 μm, situated at 40 - 42% of pharynx length ( Fig. 4B View Fig ). Tail significantly tapered toward posterior end; tip of tail with a sharp point. Tail with a series of three pairs of small curved tubular supplements situated at subventral post-cloacal region in two rows ( Figs. 4D View Fig , 6C, F View Fig ). Reproductive system diorchic with two opposed testes. Spicules paired, consist of thick and cuticularized walls, with central septum at proximal end. Gubernaculum relatively thinner at proximal end; distal end thick with hookshaped ( Figs. 4D View Fig , 6D View Fig ). Eight to nine precloacal supplements small, curved tubular-shaped, situated at subventral region in two rows ( Figs. 4E View Fig , 6E View Fig ).
Females. Similar to males in general appearance but differ in slightly longer tail length (c = 18 - 21 vs. c = 21 - 25) and sexual characteristics ( Figs. 5A, B View Fig , 6G View Fig ). Body 2,114 - 2,197 μm long; cylindrical body distinctly tapered toward posterior end. Maximum body diameter 57 - 60 μm. Amphideal fovea pocket-shaped, about 17 - 19 μm wide, 10 μm long, situated at cephalic papilla levels ( Figs. 5D View Fig , 6H View Fig ). Reproductive system didelphic; ovaries opposed and reflexed. Anterior ovary situated on right side of intestine, posterior one on right side of intestine ( Fig. 5C View Fig ). Vulva 1,196 - 1,269 μm from anterior end, situated at 57 - 58% of total body length ( Fig. 6I View Fig ). Tail 105 - 118 μm long, about 2.9 - 3.2 times of anal body diameter. Tail with several papillae randomly arranged and tip of tail sharp pointed ( Figs. 5E View Fig , 6J View Fig ).
Remarks. The genus Pheronous was established by Inglis in 1966 with the type species, P. ogdeni . It is distinguished from other genera of the family Ironidae by the presence of all papilliform anterior sensilla, relatively short spicules, conical tail with pointed tip, and the absence of caudal glands ( Inglis, 1966; Platt and Warwick, 1983; Chen and Guo, 2015) So far, only two species, P. ogdeni Inglis, 1966 and P. donghaiensis Chen and Guo, 2015 , have been described in this genus. Morphological and ecological characteristics of the genus Pheronous including the Korean P. donghaiensis are given in Table 4 View Table 4 .
Pheronous donghaiensis was firstly described from intertidal sandy sediments on the Huangcuo coast, Xiamen City and Dongshan Island of the East China Sea. Pheronous donghaiensis is characterized by a well-developed buccal cavity with four claw-like solid teeth and minute denticles, relatively short and thick spicules with central septum, the presence of 8 - 9 curved tubular-shaped precloacal supplements, tail tapers to a sharp point with three small tubular supplements arranged into two rows in males, and the absence of caudal glands.
The present Korean specimens of P. donghaiensis are clearly distinguished from P. ogdeni by the relatively long body length (2,004 - 2,180 μm vs. 1,490 - 1,980 μm in males; 2,114 - 2,197 μm vs. 1,430 - 1,770 μm in females), the number of precloacal supplements (8 - 9 vs. 4), the shape of pre- and postcloacal supplement (curved tubular-shaped vs. papilla-shaped), and the presence of central septum in spicules (absent in P. ogdeni ). The present Korean specimens are most like the original description by Chen and Guo (2015) in the following features, such as the shape of copulatory systems in males, the presence of 8 - 9 tubular precloacal and three postcloacal supplements, and the presence of thick spicules with central septum. However, the Korean specimens of P. donghaiensis are not in accord with the original description by the relatively longer spicules length (54 - 61 μm vs. 33 - 46 μm).
Distribution. China ( Chen and Guo, 2015) and Korea (Present study).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
