Chromis Katoi, a New Species of Damselfish from the Izu Islands, Japan, with a Key to Species in the Chromis Notata Species Complex (Perciforms: Pomacentridae)

aqua, International Journal of Ichthyology

Chromis katoi, a new species of damselfish from the Izu Islands, Japan, with a key to species in the Chromis notata species complex (Perciforms: Pomacentridae)

Hiroki Iwatsubo1 and Hiroyuki Motomura2*

1) Kagoshima Museum of Aquatic Biodiversity, Kagoshima MS Building, 11-21 Nishisengoku, Kagoshima 892-0847, Japan 2) Kagoshima University Museum, 1-21-30 Korimoto, Kagoshima 890-0065, Japan *Corresponding author: E-mail: [email protected]

Received: 09 May 2018 – Accepted: 31 May 2018

Keywords Schwanzflosse bei erwachsenen Tieren (im Gegensatz zu Western Pacific Ocean, damselfishes, new species, einem breiten, waagerechten Band, das beide Lappen der Chromis kennensis, Chromis notata, Chromis pura, Chromis Schwanzflosse bei notata aufweisen), die gelbe Farbe des yamakawai, Chromis westaustralis ganzen Körpers bei Jungtieren (im Gegensatz zum gräulichen bis bräunlichen Farbton während des ganzen Abstract Lebens bei notata); außerdem hat die neue Art weniger we- Chromis katoi n. sp., a new damselfish (Pomacentridae) iche Rückenflossenstrahlen, mehr röhrenförmige Seiten- belonging to the Chromis notata species complex, is de- linien-Schuppen, Brustflossenstrahlen und Kiemen- scribed on the basis of 11 specimens collected at a depth of blättchen sowie eine größere Rumpftiefe und Prä- 18 m off Hachijo Island, Izu Islands, Japan. The new Analflossenlänge. Angefügt ist ein Bestimmungsschlüssel species is similar to C. notata in having an indistinct white für die Arten des C.-notata-Komplexes. blotch at the end of the dorsal-fin base, and 4 or 5 and 11 or 12 scale rows above and below the lateral line, respec- Sommario tively, but differs in having the spinous portion of the dor- Chromis katoi n. sp., una nuova specie di castagnola (Po- sal fin yellowish in adults (vs. entire dorsal fin brownish in macentridae) appartenente al complesso di specie Chromis the latter), the caudal fin dusky yellow in adults (vs. each notata, è descritta sulla base di 11 esemplari raccolti ad una caudal-fin lobe with a broad horizontal dark band), the profondità di 18 m al largo dell'isola di Hachijo, isole Izu, body entirely yellow in juveniles (vs. grayish to brownish Giappone. La nuova specie è simile a C. notata per avere throughout life), fewer dorsal-fin soft rays, more tubed lat- una macchia bianca indistinta all'estremità della base della eral-line scales, pectoral-fin rays and gill rakers, and greater pinna dorsale, e 4 o 5 e 11 o 12 file di scaglie sopra e sotto body depth and pre-anal-fin length. A key to species in the la linea laterale, rispettivamente, ma differisce nell'avere la C. notata species complex is provided. porzione spinosa della pinna dorsale giallastra negli adulti (rispetto a tutta la pinna dorsale brunastra nel secondo), la pinna caudale giallo scuro negli adulti (vs. ogni lobo della Zusammenfassung caudale con un'ampia fascia scura orizzontale), il corpo in- Beschrieben wird Chromis katoi n. sp., ein neuer Riff- teramente giallo nei giovani (vs. da grigiastro a brunastro barsch (Pomacentridae), der dem Chromis-notata-Arten- per tutta la vita), meno raggi molli nella pinna dorsale, più Komplex zuzuordnen ist, auf der Basis von 11 Exem- scaglie della linea laterale tubate, più raggi pettorali e ra - plaren, die in einer Tiefe von 18 m vor der Insel Hachijo, strelli branchiali e una maggiore profondità corporea e Inselgruppe Izu, Japan, gesammelt wurden. Die neue Art lunghezza pre-pinna anale. Viene fornita una chiave per le ähnelt C. notata durch einen undeutlichen weißen Fleck specie appartenenti al complesso di C. notata. an der Basis der Rückenflosse und durch 4 oder 5 Schup- penreihen oberhalb und 11 oder 12 unterhalb der Seiten- linie. Unterscheidungsmerkmale aber sind: die gelbliche INTRODUCTION Färbung des Strahlenanteils der Rückenflosse (bei notata The Chromis notata species complex is character- ist die ganze Rückenflosse bräunlich), das dunkle Gelb der ized by the following combination of characters:

27 aqua vol. 24 no. 1 - 05 June 2018 Chromis katoi, a n. sp. of damselfish from the Izu Islands, Japan, with a key to species in the Chromis notata species complex (Perciforms: Pomacentridae)

XIII (rarely XII or XIV), 11-14 (usually 12 or 13) paratype, 65.9 mm SL, west of Koks Island, Shark dorsal-fin rays; II, 10-12 (usually 11) anal-fin rays; Bay, 75 m; BMNH 1975.9.23.9, paratype, 60.7 15 principal caudal-fin rays; 2 spiniform caudal-fin mm SL, Mandurah (approximately 50 km south of rays; 3-5 scale rows above lateral line, 9-12 scale Fremantle); WAM P. 2789-001, paratype, 45.1 rows below; 15-21 tubed lateral-line scales; 6-10 + mm SL, Dirk Hartog Island; WAM P. 24853-001, 18-25 = 26-34 gill rakers; caudal-fin lobes not fila- paratype, 26.5 mm SL; WAM P. 25307-011, mentous; a prominent black blotch covering more paratype, 71.6 mm SL, Goss Passage, Beacon Is- than two-thirds of pectoral-fin base; caudal fin yel- land, Houtman Abrolhos, 2-3 m; WAM P. 25308- lowish or brownish (not white); and uniformly 006, 2 paratypes, 50.1-59.9 mm SL, Seal Island, brownish or grayish head in adults (Iwatsubo & Wallabi Group, Houtman Abrolhos, 12-16 m; Motomura 2013; this study). To date, the species WAM P. 25317-009, paratype, 81.9 mm SL, Long group includes five species: Chromis notata (Tem- Island, Wallabi Group, Houtman Abrolhos, 2-8 m; minck & Schlegel 1843) (distributed in Korea, WAM P. 25376-002, paratype, 50.0 mm SL, Japan, and Taiwan to Hong Kong); Chromis ken- Tantabiddi Creek, Northwest Cape, 16-18 m; nensis Whitley 1964 (eastern Australia, New Cale- WAM P. 25293-001, 72.2 mm SL, south side of donia and Tonga); Chromis westaustralis Allen 1976 Rottnest Island; WAM P. 25742-005, 78.1 mm SL, (western Australia); Chromis pura Allen & Randall Strickland Bay, Rottnest Island, 3-4 m; WAM P. 2004 (Lesser Sunda Islands, Indonesia); and 33182-018, 4 specimens, 57.3-78.1 mm SL, Hout- Chromis yamakawai Iwatsubo & Motomura 2013 man Abrolhos, 37-38 m; WAM P. 33193-004, 2 (southern Japan to the Philippines). The natural specimens, 78.8-89.7 mm SL, Rottnest Island, 35 integrity of this group is hypothetical and needs to m. Chromis yamakawai – KAUM-I. 200411, 80.8 be confirmed with molecular analysis. mm SL, same data as holotype of C. katoi. During ongoing taxonomic studies of Japanese damselfishes (e.g., Iwatsubo & Motomura 2010, Key to species in the Chromis notata species 2013, 2016; Nishiyama et al. 2012a,b; Wibowo et complex al. 2017; Motomura et al. 2017), 11 specimens of 1a. Four or five scale rows above lateral line and 11 an unidentified species of the C. notata species com- or 12 scale rows below; an indistinct white plex were collected at a depth of 18 m off Hachijo blotch at end of dorsal-fin base …………… 2 Island, Izu Islands. The specimens are herein de- 1b. Three scale rows above lateral line and 9 or 10 scribed as a new species of Chromis and a key to scale rows below; no white blotch at end of species of the C. notata species complex provided. dorsal-fin base ...... 3 2a. Body yellow in juveniles; 12 dorsal-fin soft MATERIALS AND METHODS rays; 17-19 (usually 18) tubed lateral-line Counts and measurements followed Hubbs & La- scales; usually 20 pectoral-fin rays ...... gler (1947) and Iwatsubo & Motomura (2013)...... Chromis katoi n. sp. (Izu Islands, Japan) Standard length is abbreviated as SL. Curatorial 2b. Body brownish in juveniles; 11-14 (usually 13) procedures for collected specimens followed Moto- dorsal-fin soft rays; 16-21 (usually 17) tubed mura & Ishikawa (2013). Institutional codes fol- lateral-line scales; usually 19 pectoral-fin rays . low Sabaj (2016). Comparative material was listed ...... Chromis notata (East Asia) in Iwatsubo & Motomura (2013) (including 195, 3a. Caudal peduncle yellowish; body depth > 50% 22 and 105 specimens of C. notata, C. kennensis of SL ...... Chromis pura (Indonesia) and C. yamakawai, respectively). Additional speci- 3b. Caudal peduncle brownish; body depth < 50% mens examined during this study included: of SL ...... 4 Chromis pura (all collected from Pura, Alor Islands, 4a. Prominent black blotch covering upper half of Indonesia, 18 m depth) – WAM P. 25317-008, pectoral-fin base in adults; 17-19 (usually 17) holotype, 67.6 mm SL; CAS 219160, 2 paratypes, tubed lateral-line scales ...... 55.3-66.3 mm SL; MNHN 2004-0558, paratype, ...... Chromis westaustralis (Western Australia) 70.9 mm SL; USNM 376247, paratype, 66.3 mm 4b. Prominent black blotch covering entire pec- SL. Chromis westaustralis (all collected from West- toral-fin base in adults; 15-21 (usually 18-19) ern Australia) – WAM P. 25317-008, holotype, tubed lateral-line scales ...... 5 85.2 mm SL, Long Island, Wallabi Group, Hout- 5a. Prominent black blotch covering entire pec- man Abrolhos, 2-8 m; AMS I. 18475-001, toral-fin base in juveniles; 15-19 (usually 18) aqua vol. 24 no. 1 - 05 June 2018 28 Hiroki Iwatsubo and Hiroyuki Motomura

tubed lateral-line scales; 29-34 total gill rakers; Chromis sp. 1: Kato 2011: 60, unnumbered figs. pelvic-fin axillary scale length 0.6-1.8% of SL; (Hachijo Island, Izu Islands, Japan, 15-35 m basal width of scale between pelvic-fins 2.0- depth). 2.8% of SL ...... ….... Chromis kennensis (southwestern Paci fic Holotype: KAUM-I. 200400, 98.0 mm SL, off Ei- Ocean) go, Hachijo Island, Izu Islands, Japan, 33°08 N, 5b. Prominent black blotch covering half of pec- 139°44 E, 18 m depth, 6 June 2016, SCUBA, S. toral-fin base in juveniles; 16-21 (usually 19) Kato. tubed lateral-line scales; 27-33 total gill rakers; Paratypes (all collected with holotype): KAUM-I. pelvic-fin axillary scale length 1.4-2.8% of SL; 200401, 105.4 mm SL, KAUM-I. 200402, 81.4 basal width of scale between pelvic-fins 22-3.9% mm SL, KAUM-I. 200403, 66.3 mm SL, KAUM- of SL ...... I. 200404, 80.9 mm SL, KAUM-I. 200405, 82.4 ...... Chromis yamakawai (Japan and Taiwan) mm SL, KAUM-I. 200406, 79.6 mm SL, KAUM- I. 200407, 83.8 mm SL, KAUM-I. 200408, 93.5 mm SL, KAUM-I. 200409, 83.1 mm SL, KAUM- Chromis katoi, n. sp. I. 200410, 93.7 mm SL. New English name: Kato’s Chromis; new Japanese Diagnosis: A species of Chromis with the follow- name: Nanohana-suzumedai ing combination of characters: dorsal-fin rays XIII, (Figs 1-2; Tables I-II) 12-13 (mode 12); anal-fin rays II, 11-12 (11); pec-

Figs 1A-D. Photographs of Chromis katoi n. sp. from Hachijo Island, Izu Islands, Japan. A. KAUM-I. 200403, paratype, 66.3 mm SL; B. KAUM-I. 200400, holotype, 98.0 mm SL; C. Juvenile. Photo by S. Kato; D. Adult. Photos by S. Kato.

29 aqua vol. 24 no. 1 - 05 June 2018 Chromis katoi, a n. sp. of damselfish from the Izu Islands, Japan, with a key to species in the Chromis notata species complex (Perciforms: Pomacentridae) toral-fin rays 19-20 (20); principal caudal-fin rays file of head slightly convex. Snout shorter than or- 15; spiniform caudal-fin rays 2; tubed lateral-line bit diameter. Mouth terminal, small, oblique; pos- scales 17-19 (18); scale rows above lateral line 4, terior margin of maxilla reaching to (or just short scale rows below 11; gill rakers 7-9 (8) + 18-20 of) vertical through anterior margin of pupil. Up- (19) = 26-29 (28); preopercular margin smooth; per jaw with outer row of canine teeth; 2 or 3 ir- caudal fin deeply forked, without prolonged fila- regular inner rows of conical teeth anteriorly, one ments; base width of pelvic-fin axillary scale 1.8- row posteriorly. Lower jaw with outer row of ca- 2.7% of SL; base width of scale between pelvic-fin nine teeth; inner row of small conical teeth anteri- bases 3.0-3.9% of SL; prominent black blotch cov- orly, absent posteriorly. No teeth on vomer and ering upper two-thirds of pectoral-fin base; spinous palatines. Tongue obtusely triangular. Gill rakers portion of dorsal fin yellowish; white blotch at end long, slender, longest on lower limb near angle, of dorsal-fin base; caudal peduncle without distinct about three-fourths length of longest gill filaments. markings; caudal fin yellowish without dark band Nostril with fleshy rim, more elevated on posterior along each fin lobe; body and fins yellow in juve- edge, located at level of middle of pupil (at variable niles. levels between upper and lower margins of pupil). Description: Proportional measurements as per- Preopercular margin smooth; upper end not reach- centages of SL given in Table I (holotype given ing level of upper margin of orbit. Suborbital with first, followed by paratype data in parentheses if free lower margin. Opercular margin with small different). Characters given in the diagnosis are not flat spine, projecting from beneath large scale. repeated here. Body scales finely ctenoid. Scales covering head, Body moderately deep, compressed. Dorsal pro- except for lips, tip of snout and a narrow zone from

Figs 2A-D. Underwater photographs of Chromis katoi n. sp. of Hachijo Island, Izu Islands, Japan. A. Mature male; B. Mature female; C. Spawning of C. katoi; D. Male protecting nest. Photos by S. Kato. aqua vol. 24 no. 1 - 05 June 2018 30 Hiroki Iwatsubo and Hiroyuki Motomura

Table I. Counts and measurements, expressed as percentages of standard length, of type specimens of Chromis katoi n. sp. (Modes and means in parentheses).

Holotype Paratypes KAUM-I. 200400 KAUM-I. 200401-200409 n Standard length (mm; SL) 98.0 66.3-105.4 10 Counts Dorsal-fin rays XIII, 12 XIII, 12-13 (13) 10 Anal-fin rays II, 11 II, 11-12 (II, 11) 10 Pectoral-fin rays 20 19-20 (20) 10 Pelvic-fin rays I, 5 I, 5 10 Spiniform caudal-fin rays 2 2 10 Principal caudal-fin rays 15 15 9 Tubed lateral-line scales 19 17-19 (18) 8 Pored scales on caudal peduncle 8 7-9 (8) 9 Scale rows above / below lateral line 4 / 11 4 / 11 10 Gill rakers 9 + 19 = 28 7-9 (8 or 9) + 18-20 (19) = 26-29 (28) 10 Measurements (% SL) Head length 31.3 30.1-32.3 (31.2) 10 Snout length 7.8 6.9-9.7 (7.8) 10 Body depth 50.7 49.9-55.3 (51.8) 10 Body width 20.7 19.0-20.9 (19.6) 10 Orbit diameter 10.5 10.4-11.9 (11.0) 10 Interorbital width 11.0 10.9-12.2 (11.4) 10 Caudal-peduncle depth 15.1 13.3-16.3 (15.3) 10 Caudal-peduncle length 13.9 12.5-15.1 (13.5) 10 Upper-jaw length 9.7 9.5-11.4 (10.1) 10 Pre-dorsal-fin length 39.1 39.1-41.4 (40.3) 10 Dorsal-fin base length 61.1 59.9-63.7 (61.5) 10 1st dorsal-fin spine length 6.6 7.3-8.9 (8.1) 10 2nd dorsal-fin spine length 9.4 10.9-14.2 (12.4) 10 3rd dorsal-fin spine length 12.9 14.3-16.5 (15.5) 10 5th dorsal-fin spine length 15.9 17.1-18.3 (17.7) 9 7th dorsal-fin spine length 16.0 16.8-18.3 (17.4) 10 Last dorsal-fin spine length 13.1 13.1-14.8 (14.2) 10 1st dorsal-fin soft ray length 16.7 16.3-19.2 (17.7) 10 Longest dorsal-fin soft ray length 19.2 21.7-26.7 (23.9) 10 Last dorsal-fin soft ray length 8.6 9.3-11.1 (10.1) 10 Pre-anal-fin length 71.7 69.2-74.5 (71.6) 10 Anal-fin base length 21.0 20.6-22.1 (21.3) 10 1st anal-fin spine length 6.2 6.6-7.5 (6.9) 10 2nd anal-fin spine length 17.9 18.8-22.6 (20.7) 10 1st anal-fin soft ray length 18.5 19.5-22.6 (20.8) 9 Longest anal-fin soft ray length 19.2 20.2-22.5 (21.5) 10 Last anal-fin soft ray length 9.1 8.2-9.9 (9.1) 10 Caudal-fin length 36.9 35.2-42.7 (37.9) 10 Caudal-fin concavity 14.7 14.1-17.5 (15.9) 10 Pectoral-fin length 30.3 29.4-33.8 (31.2) 10 Pre-pelvic-fin length 41.2 40.7-44.7 (42.3) 10 Pelvic-fin spine length 16.6 15.8-18.1 (17.0) 10 1st pelvic-fin soft ray length 27.6 26.3-33.1 (28.1) 10 Base width of pelvic-fin axillary scale 2.0 1.8-2.7 (2.2) 8 Base width of scale between pelvic-fin bases 3.5 3.0-3.9 (3.4) 10

31 aqua vol. 24 no. 1 - 05 June 2018 Chromis katoi, a n. sp. of damselfish from the Izu Islands, Japan, with a key to species in the Chromis notata species complex (Perciforms: Pomacentridae)

Table II. Frequency distributions of selected counts of Chromis katoi n. sp. and C. notata.

Dorsal-fin soft rays Anal-fin soft rays n 11 12 13 14 n 10 11 12 C. katoi n. sp. 11 — 10H 1 — 11 — 10H 2 C. notata 184 1 30 141L 12 186 17L 145 24

Pectoral-fin rays

n 16 17 18 19 20 C. katoi n. sp. 11 — — — 2 9H C. notata 183 2 4 24 146L 7

Tubed lateral-line scales

n 16 17 18 19 20 21 C. katoi n. sp. 9 — 3 4 2H — — C. notata 154 16 73 54L 9 1 1

Scale rows above lateral line Scale rows below lateral line

n 4 5 n 11 12 C. katoi n. sp. 11 11H — 11 11H — C. notata 145 141L 4 143 128 15L

Gill rakers on upper limb Gill rakers on lower limb

n 7 8 9 10 n 18 19 20 21 22 23 24 C. katoi n. sp. 11 1 5 5H — 11 1 8H 2 — — — — C. notata 131 26 56L 47 2 130 — 5 38 49 25 12L 1

Total gill rakers

n 26 27 28 29 30 31 32 33 C. katoi n. sp. 11 2 3 5H 1 — — — — C. notata 131 — 13 26 33 31 17L 8 3

H and L include holotype of Chromis katoi n. sp. and lectotype of C. notata respectively orbit to around nostrils. Anterior lateral line end- fin reaching to (or just short of) origin of anal fin. ing below soft-rayed portion of dorsal fin. Scaly Color when fresh [based on color pho- sheath at base of dorsal fin, about half pupil diam- tographs of holotype (KAUM-I. 200400; Fig. 1B) eter at base of middle of dorsal fin. Scales covering and paratype (KAUM-I. 200403; Fig. 1A)]: body dorsal, pectoral and anal fins basally. Small scales olive-brown with brown-margined body scales covering entire caudal fin, except for center and (body more yellowish in young). Upper head and posterior margin. Small scales on basal pectoral nape yellowish-brown; suborbital and opercular fins. A median scale process extending posteriorly scales sometimes bluish. Spinous portion of dorsal from between bases of pelvic fins, its length about fin yellowish; soft-rayed portion of dorsal fin half pelvic-fin spine. Axillary scale above base of blackish anteriorly, translucent posteriorly. Promi- pelvic spine more than one-third length of spine. nent black blotch covering upper two-thirds of Origin of dorsal fin above third (or fourth) tubed pectoral fin base. Indistinct white spot at end of lateral-line scale. Tip of pectoral fin not reaching dorsal fin base. Pectoral fin translucent. Pelvic fin vertical through origin of anal fin. Depressed pelvic white to brownish anteriorly, translucent posterior- aqua vol. 24 no. 1 - 05 June 2018 32 Hiroki Iwatsubo and Hiroyuki Motomura ly. Anterior two-thirds of anal fin blackish, remain- and higher numbers of tubed lateral-line scales [17- der translucent. Caudal fin lobes dark yellow, 19 (18) vs. 16-21 (17)], pectoral-fin rays [19-20 translucent centrally. (20) vs. 16-20 (19)] and gill rakers [18-20 (19) low- Color of preserved specimens similar to er rakers and 26-29 (28) total rakers vs. 19-24 (21) fresh, except for dusky brown spinous portion of and 28-33 (30) respectively] (Table II). The body dorsal and caudal fins. depth of C. katoi is 49.9-55.3% of SL (mean Distribution: Currently known only off Hachijo 51.8%), whereas that of C. notata is 37.8-52.3% Island, Izu Islands, Japan at depths of 15-35 m. (46.2%). In addition, the pre-anal-fin length in C. Ecological notes: Underwater observations off katoi (69.2-74.5% of SL, mean 71.6 %) tends to be Hachijo Island showed that C. katoi and C. ya- shorter than that in C. notata (58.0-74.8%, 64.0%) makawai sometimes co-occurred in the same (Table I; Iwatsubo & Motomura, 2013: Table II). school on rocky reefs (KAUM-I. 200411 being collected with the type specimens of C. katoi), al- ACKNOWLEDGEMENTS though C. katoi was usually observed in depths of We are especially grateful to S. Kato (Regulus 18-25 m, whereas C. yamakawai usually inhabited Diving), who collected all of the type specimens of shallower waters (6-12 m) (Kato, 2011; S. Kato, the new species and made them available to us, and pers. comm.). Reproductive behavior of C. katoi for kindly providing underwater photographs of C. has been observed between spring and summer off katoi from Hachijo Island. We thank M. Mc- Hachijo Island, the body of mature males becom- Grouther, A. Hay and S. Reader (AMS), A. Suzu- ing bluish-white (Fig. 2A) during the reproductive moto and L. O’Hara (BPBM), D. Catania (CAS), season. Although males secure nests on rocks in P. Pruvost, P. Béarez, R. Causse, Z. Gabsi and L.- depths of 25-35 m, they do not subsequently pre- M. Duque Vélez (MNHN), J. Williams and S. pare them in any way (S. Kato, pers. comm.). The Raredon (USNM), and G. Moore and M. Allen body of mature females becomes blackish (Fig. (WAM) for opportunities to examine specimens of 2B), females being led to the nest by the entice- Chromis. We also thank G. Hardy (Ngunguru, ment display of the male (spreading of all fins) and New Zealand) for reading the manuscript and pro- then spawning (Kato, 2011; Fig. 2C; S. Kato, pers. viding help with English, S. Tashiro, H. Hata and comm.). Males protect nests until the eggs hatch B. Jeong (KAUM) for examining the type speci- (Fig. 2D; S. Kato, pers. comm.). mens of Chromis, and Y. Haraguchi, volunteers and Etymology: Named in honor of Mr. Shoichi Kato students of KAUM for curatorial assistance. This (Hachijo Island, Japan), who collected all type spec- study was supported in part by JSPS KAKENHI imens of the species and made them available to us. Grant Numbers JP19770067, JP26241027, Remarks: Chromis katoi n. sp. is similar to C. nota- JP24370041, JP23580259 and JP26450265; the ta in sharing the following combination of charac- JSPS Core-to-Core Program: B Asia-Africa Science ters: an indistinct white blotch at the end of the dor- Platforms; the “Biological Properties of Biodiversi- sal-fin base (vs. white blotch absent in all other ty Hotspots in Japan” project of the National Mu- members of the C. notata species complex); and 4 or seum of Nature and Science, Tsukuba, Japan; “Es- 5 and 11 or 12 scale rows above and below the lat- tablishment of Research and Education Network eral line respectively (vs. 3 and 9 or 10, respectively) on Biodiversity and Its Conservation in the Sat- (Fig 1; Tables I-II). However, the former is easily dis- sunan Islands” project of Kagoshima University tinguished from C. notata by having the dorsal fin adopted by the Ministry of Education, Culture, spinous portion yellowish and the caudal fin dusky Sports, Science and Technology, Japan; and the “Is- yellow in adults (Figs 1A, B) (brownish dorsal fin land Research” project of Kagoshima University. and broad dark band along each caudal-fin lobe in C. notata; Iwatsubo & Motomura 2013: fig. 3). The body of C. katoi is entirely yellow in juveniles (Fig. REFERENCES 1C), becoming greenish to brownish with growth HUBBS, C. L. & LAGLER, K. F. 1947. Fishes of the Great (Figs 1A, B, D), whereas that of C. notata is grayish Lakes region. Cranbrook Institute of Science Bulletin 26: i- xi + 1-186. to brownish throughout life (Iwatsubo & Motomu- IWATSUBO, H. & MOTOMURA, H. 2010. Japanese records ra 2013: fig. 3). In addition, C. katoi differs slightly and standard Japanese names of Chromis analis and C. al- from C. notata in having a lower number of dorsal- bicauda (Perciformes: Pomacentridae). Bulletin of the Bio- fin soft rays [12 vs. 11-14 (mode 13) in C. notata], geographical Society of Japan 65: 57-64.

33 aqua vol. 24 no. 1 - 05 June 2018 Chromis katoi, a n. sp. of damselfish from the Izu Islands, Japan, with a key to species in the Chromis notata species complex (Perciforms: Pomacentridae)

IWATSUBO, H. & MOTOMURA, H. 2013. Redescriptions of NISHIYAMA, H., DEWA, S., CHIBA, S. N. & MOTOMURA, Chromis notata (Temminck and Schlegel, 1843) and C. H. 2012. First Japanese record of a damselfish, Chromis kennensis Whitley, 1964 with description of a new species earina (Perciformes, Pomacentridae), from Iou-jima Is- of Chromis (Perciformes: Pomacentridae). Species Diversi- land, Kagoshima Prefecture, Japan. Japanese Journal of ty 18: 175-182. Ichthyology 59: 61-67. IWATSUBO, H. & MOTOMURA, H. 2016. Japanese records NISHIYAMA, H., WATAI, M., SENOU, H. & MOTOMURA, and standard Japanese names of Chromis analis and C. H. 2012b. Records of Stegastes insularis (Perciformes, Po- xouthos (Perciformes: Pomacentridae). Taxa 41: 40-45. macentridae) from Yoron-jima Island, the Amami Is- KATO, S. 2011. Damsel Fishes Illustrated. Seibundo- lands, Kagoshima Prefecture, Japan, and notes on distri- Shinkosha, Tokyo, 239 pp. butional implications for the species. Japanese Journal of MOTOMURA, H. & ISHIKAWA, S. 2013. Fish Collection Ichthyology 59: 155-162. Building and Procedures Manual. English Edition. The SABAJ, M. H. 2016. Standard symbolic codes for institutional Kagoshima University Museum, Kagoshima and the Re- resource collections in herpetology and ichthyology: an online search Institute for Humanity and Nature, Kyoto, 70 pp. reference. Version 6.5 (16 August 2016). Electronically ac- Available at http://www.museum.kagoshima-u.ac.jp/ cesible at http://www.asih.org/, American Society of staff/motomura/dl_en.html Ichthyologists and Herpetologists, Washington, DC. MOTOMURA, H., NISHIYAMA, H. & CHIBA, S. N. 2017. WIBOWO, K., TODA, M. & MOTOMURA, H. 2017. Validity Review of the Chromis xanthura species group (Perci- of Abudefduf caudobimaculatus Okada and Ikeda 1939 formes: Pomacentridae), with description of a new and synonymies of Abudefduf vaigiensis (Quoy and species. Ichthyological Research, doi 10.1007/s10228-017- Gaimard 1824) (Perciformes: Pomacentridae). Ichthy- 0601-8 (also printed as 65 (2): 177-191 on 17 Mar. ological Research, doi 10.1007/s10228-017-0594-3 (also 2018). printed as 65 (1): 78-91 on 14 Jan. 2018).

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