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Chromis iomelas

Half-and-half Chromis

Multimedia & Additional Resources

Type	Description	Download
Image:	Adult (sw. Pacific)	16KB
Video:	Suwarrow (© G.Wragg)	574KB

General Information

COMMON NAMES: Half-and-half Chromis, Black-and-white Chromis; German Pazifischer Trauermantel; French Chromis Divisé

TRADITIONAL NAMES: Katoti (TS TW)

GLOBAL DISTRIBUTION: NATIVE GBR - Societies; n. to PNG; s. to New Caledonia

COOK ISLANDS STATUS: Native; PLUS: N.Group. Uncommon (2+); Marine, near-shore, outer reef-slope

SIMILAR SPECIES: Bicolor Chromis (Chromis margaritifer) has white tail and tailbase and rear margin of Dorsal (vs. whole hindbody white, including Anal and 50% Dorsal); Black Chromis (Chromis xanthura) adult has white tail and tailbase but not extending onto Dorsal rear-margin (vs. white extending onto rear of Dorsal); adult is to 15cmSL (vs. 7cmSL, and Bicolor Chromis to 9cmSL).

Cook Islands Distribution

View Distribution Map

Southern Group: Present Makatea:
RR	MG	AT	MK	MT	AK	PL	TK	MN

Northern Group: Present
TN	MH	RK	PK	NS	SW
					P

Key to Symbols

blank	no data
-	absent	L	localised
X	extinct 'naturally'	W	widespread
XQi	quarantine intercepted	R	recent
XQe	eradicated	?	query preceding category
P	present	T?	taxonomic query
S	seasonal	nn	present, said to have no name
O	occasional	?1	present, name not investigated
++++	very common	?2	presence not verified, no name recorded
+++	common	N/A	absent, name not expected
++	uncommon
+	rare
Cook Islands islands: RR =Rarotonga, MG = Mangaia, AT =‘Ātiu, MK=Ma‘uke, MT=Miti‘āro, AK=Aitutaki, PL=Palmerston, PN=Penrhyn, MN=Manuae, TK=Takūtea, TN=Tongareva (TS=Tongaleva Spoken, TW=Tongareva Written, they say "el" but write "r"), MH=Manihiki, RK=Rakahanga, PK=Pukapuka, NS=Nassau, SW=Suwarrow. After a Polynesian name: ^=orthography query. Countries and other: FIJ=Fiji, WT=Wallis & Futuna, SAM=Samoa, TON=Tonga, NIU=Niue, CK=Cook Islands, CKM=Cook Islands Māori, FP=French Polynesia, AUS=Australs, SOC=Societies, TAH=Tahiti, TUA=Tuamotus, MQS=Marquesas, MNG=Mangareva, PIT=Pitcain group, EAS=Easter Island, HAW=Hawai‘i, NZ=New Zealand, NZM=New Zealand Māori

Scientific Taxonomy

Chromis iomelas Jordan & Seale, 1906
TAXONOMY: ANIMALIA; CHORDATA; GNATHOSTOMATA (Jawed Vertebrates); PISCES; OSTEICHTHYES; Perciformes; Labroidei; POMACENTRIDAE, Chrominae

Vouchers & References

Vouchers:
Suwarrow: Photos lagoon N.Sims, ID J.E.Randall (Sims88 & EIA99).

References:
p.259 Randall et al. (1990) Fishes of the Great Barrier Reef....
p.387 Burgess et al. (1988) Atlas of Marine Aquarium Fishes (TFH)
plate 79-06 Lieske & Myers (1996) Coral Reef Fishes
plate 65-07 Allen (1997) Marine Fishes of Tropical Australia....

Data Update History (information):
zTX, zB02, zM02, zupM06a

Web Resources

Citation Information

McCormack, Gerald (2007) Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga. Online at http://cookislands.bishopmuseum.org.
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