Taxonomic review of dwarf species of Eumicrotremus (Actinopterygii: Cottoidei: Cyclopteridae) with descriptions of two new species from the western North Pacific Author Lee, Soo Jeong Author Kim, Jin-Koo Author Kai, Yoshiaki Author Ikeguchi, Shin’Ichiro Author Nakabo, Tetsuji text Zootaxa 2017 4282 2 337 349 journal article 28724 10.11646/zootaxa.4282.2.7 d6db56eb-3ad0-47bb-8e1c-583f7d5b648e 1175-5326 818722 F7A67B55-5541-436C-BA0B-7ECA581B3791 Eumicrotremus jindoensis Lee and Kim , new species http://zoobank.org/urn:lsid:zoobank.org:act:03B6D01F-9690-4C95-A117-33E0B8D22BD7 [New Korean name: Gin-kko-ri-eom-ji-do-chi] ( Figs. 1 E, F, 2C, 3C; Table 1 ) Lethotremus awae (not of Jordan and Snyder, 1902 ): Ding, 1987 : 408 , Liaoning ; Jin, 2006 : 619 , fig. 277, Liaoning, Shandong , northern East China Sea. Holotype. PKU 10232* (mtDNA only), 19.7 mm SL, Jin-do, southwestern coast of Korean Peninsula, 18 April 2013 , bag net , 20–30 m depth, coll by Jin-Koo Kim. Paratype . PKU 10233* (mtDNA only), 24.8mm SL, collection data as for holotype. Diagnosis. A species of Eumicrotremus with the following combination of characters: no spiny tubercles or fleshy papillae on body; anterior one to three mandibular pores each with a short barbel-like tube; interorbital pore absent; suborbital pore present; opercular flap triangular; papillae on ventral disk absent; caudal-fin long, 32.7–42.1% of SL. Description. Counts and proportional measurements are shown in Table 1 . Body globose, completely naked without spiny tubercles or fleshy papillae; caudal part of body compressed. Interorbital space broad, flat. Eye moderately large, located much closer to snout than to gill opening. Mouth large, somewhat oblique; upper jaw projecting slightly beyond lower jaw; posterior margin of maxilla reaching below level of center of orbit. Jaws with conical teeth irregularly arranged in two or three rows; teeth on innermost row somewhat larger. Teeth on vomer and palatine absent. Gill slit short, its length much shorter than orbit diameter, located below origin of first dorsal fin and not reaching upper pectoral origin. Opercular flap triangular, directed posterodorsally, Cephalic pores small or indiscernible ( Fig. 2 B). Nasal canal with no visible pores; interorbital canal without pores; postorbital canal with postbranchial pore; infraorbital canal without pores; operculomandibular canal with four mandibular pores along lower jaw, posterior three (third only in paratype ) with a short barbel-like tube; anteriormost pore below tip of mandibular, second below posterior part of lower jaw, third below center of orbit; fourth at posteroventral margin of preopercle. Free neuromasts reduced or indiscernible. Two dorsal fins, first dorsal fin somewhat shorter than second; first dorsal fin without spiny tubercles; second dorsal fin located slightly anterior to opposite anal fin, length and height almost equal, without spiny tubercles. Second dorsal and anal fins extending beyond caudal fin base when depressed. Caudal fin long, rounded, its length greater than pelvic disc length. Pectoral fins short, posterior tips not reaching level of posterior margin of pelvic disk; pectoral-fin base long, lowermost point below posterior margin of orbit. Pelvic disc large, somewhat elliptical, without papillae ( Fig. 3 ). Anus located much closer to ventral disk than to anal fin origin. TABLE 1. Counts anđ measurements of three species of Eumicrotremus (Means in parentheses). Eumicrotremus awae Eumicrotremus uenoi Eumicrotremus jindoensis Non-type Holotype Paratypes Other materials Holotype Paratype Color in preservative ( Fig. 1 C, D). In 70% ethanol, head and body pale with numerous melanophores, except around anus. First dorsal fin dark; second dorsal, anal, caudal and pectoral fins translucent. Ventral disc white, with dark margin.

n = 30	FAKU 136008	n = 26	n = 5*	PKU 10232	PKU 10233
Stanđarđ length (mm)	8.6­24.1	14.2	3.9­19.9	8.2­17.9	19.7	24.8
Counts
First đorsal fin	VI­VIII	VI	V­VII	VI-VII	VI	VI
Seconđ đorsal fin	7­9	8	7­9	8­9	9	9
Anal fin	6­8	7	6­8	7­9	8	8
Pectoral fin	19­23	21	20­24	-	21	21
Vertebrae (precauđal + cauđal)	9­11+12­14	10+13	10­11+12­14	-	21	24
Measurements (in % of stanđarđ length) Heađ length Bođy đepth Bođy wiđth Cauđal peđuncle đepth Snout length Orbital điameter Interorbital wiđth Postorbital length Upper jaw length	42.0­53.9 (48.7) 32.9­54.6 (47.6) 25.7­51.7 (38.9) 9.0­14.2 (11.4) 8.4­17.8 (14.4) 11.1­17.8 (14.8) 14.4­25.1 (20.0) 21.3­27.7 (24.0) 14.8­26.2 (19.8)	50.7 51.5 48.0 13.1 17.6 12.4 23.5 23.4 23.8	45.5­54.3 (51.0) 41.8­52.3 (47.0) 35.5­49.0 (43.0) 9.5­14.1 (11.4) 12.6­20.1 (15.4) 12.6­17.8 (14.8) 15.2­21.8 (19.2) 19.7­27.9 (24.1) 14.7­24.5 (20.4)	44.8­51.0 (46.4) 41.4­47.1 (45.3) 24.4­42.3 (34.6) 11.0­14.6 (12.3) 6.1­13.3 (8.7) 10.3­16.9 (13.7) 19.0­27.3 (24.4) 20.9­26.4 (24.0) 13.4­20.4 (16.6)	50.3 46.2 37.1 11.7 8.1 14.1 21.4 19.8 20.6	41.9 42.3 38.7 14.9 9.1 17.3 24.4 24.4 18.3
Gill slit length Preanal-fin length Preanus length Pectoral fin length Inner đisc length Inner đisc wiđth Disc length Disc wiđth Length of first đorsal-fin base Length of seconđ đorsal-fin base Length of anal fin base Cauđal fin length Upper peđuncle length Lower peđuncle length * Except for NIBR-P 4830	6.1­12.5 (9.1) 68.3­89.2 (77.6) 53.9­71.2 (62.8) 20.0­28.8 (24.0) 11.9­19.8 (16.3) 13.8­20.7 (17.0) 29.3­39.6 (34.6) 26.7­35.2 (31.1) 17.2­36.6 (29.5) 12.2­23.4 (18.6) 9.0­18.5 (14.3) 21.0­30.5 (25.3) 11.9­17.4 (14.8) 11.6­16.7 (14.3)	8.9 77.7 63.6 18.0 14.5 16.6 29.6 29.4 23.2 23.7 9.2 23.9 15.0 19.7	6.6­11.3 (8.5) 68.6­83.5 (77.4) 59.4­75.5 (64.5) 21.8­29.5 (25.1) 12.0­18.5 (15.0) 14.2­18.8 (16.1) 28.3­35.4 (31.7) 24.7­32.9 (28.9) 18.0­30.5 (24.5) 17.4­26.2 (20.4) 12.3­19.4 (15.6) 23.7­31.4 (27.1) 9.7­17.7 (13.9) 11.5­19.8 (14.4)	- 67.8­88.0 (78.5) 58.6­67.6 (62.6) 17.6­25.0 (20.3) 16.3­17.5 (16.9) 15.1­18.3 (16.7) 26.7­34.3 (31.4) 22.7­31.0 (26.5) 17.1­23.9 (20.4) 17.4­21.8 (19.8) - 19.5­23.3 (21.9) 13.4­16.8 (15.1) 14.5­19.5 (16.8)	- 78.1 58.3 - - 17.3 17.3 32.0 25.4 18.8 20.8 21.3 42.1 13.7 15.2	- 79.4 58.0 20.2 11.3 11.7 22.6 18.1 19.4 20.2 11.7 32.7 8.1 14.9

Distribution. In addition to the type locality, literature records ( Ding, 1987 ; Jin, 2006 ) suggest that the species is distributed in the Yellow Sea ( Fig. 4 ; see below Remarks). Etymology. The specific name “ jindoensis ” is derived from the type locality, Jin-do Island. Remarks. Li’s (1955) description of “ L. awae ” on the basis of specimens collected from the Bohai Sea, China , included barbel-like tubes under the mandible, a triangular opercular flap, and a pale body with numerous melanophores. Those characters closely matched the present specimens of E. jindoensis . Although Li (1955) noted that the specimens lacked sensory pores, this may have simply reflected the difficulty of discerning them. However, the caudal fin length (27.5% SL) closely matched those of E. awae and E. uenoi , making the identification of Li’s (1955) species somewhat equivocal. The descriptions of L. awae given by Ding (1987) and Jin (2006) agreed with the present specimens of E. jindoensis in having barbel-like tubes under the mandible, a triangular opercular flap, a pale body with numerous melanophores, and no (= indiscernible) sensory pores. Jin (2006) also noted a long caudal fin (32.1% SL), similar to the present specimens of E. jindoensis .