Chromis degruyi
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BibTeX: @article{Richard2008Zootaxa1671, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Richard2008Zootaxa1671">{{Citation |
Ordo: Perciformes
Familia: Pomacentridae
Genus: Chromis
Name
Chromis degruyi Richard L. Pyle, 2008 – Wikispecies link – Pensoft Profile
- Chromis degruyi Richard L. Pyle, 2008, Zootaxa 1671: 18-21.
Description
(Figs. 4 a – 4 c; Table 5; Morphbank 122; DigiMorph 123; GenBank 124; Barcode 125)
Materials Examined
Holotype.BPBM40842 126 (81.0 mm SL), Belau (Palau) Islands; Kayangel Atoll, W side; on outer reef dropoff near tip of small reef extension (8 ° 4 ' 16.64 "N, 134 ° 40 ' 54.52 "E): rocky ledge with holes at base of steep sandy slope with many gorgonians, 85 m, hand net, R.L. Pyle, 22 April 2007 [PCMB3086 127]. Paratypes.BMNH2007.10. 31.4 128 (38.7 mm SL), Caroline Islands; Yap, S end; “Magic Kingdom” (9 ° 26 ' 3.41 "N, 138 ° 2 ' 5.96 "E): deep rubble on rocky slope, 85 m, quinaldine and hand net, R.L. Pyle, 20 April 2007 [PCMB3084 129]. CAS225758 130 (38.3 mm SL), Caroline Islands; Puluwat Atoll; Alet Islet, S side (7 ° 21 ' 15.44 "N, 149 ° 10 ' 47.03 "E): outer reef drop-off with small caves and holes, 100–103 m, quinaldine and hand net, R.L. Pyle and B.D. Greene, 11 April 2007 [PCMB3032 131]. USNM391139 132 (76.6 mm SL), Belau (Palau) Islands; off Ngemlis Island; below and slightly to the N of the Blue Holes cave system (7 ° 8 ' 16.49 "N, 134 ° 13 ' 18.5 "E): in coral and rubble at the base of a large boulder offset from the drop-off, 88 m, hand net, R.L. Pyle, 27 April 2007 [PCMB3114 133]. WAM P. 32901 -001 134 (82.4 mm SL), Belau (Palau) Islands; Ngaruangl Atoll, S end (8 ° 8 ' 50.39 "N, 134 ° 37 ' 3.47 "E), 115 m, hand net, R.L. Pyle, 23 April 2007 [PCMB3088 135].
Diagnosis
Diagnosis. Dorsal rays XIII–XIV, 11–12 (usually XIV, 12); anal rays II, 11–12 (usually 12); pectoral rays 18; spiniform caudal rays 3; tubed lateral-line scales 15–17; gill rakers 7 + 20–21 (total 27–28); body depth 1.84–1.99 in SL; color of adults when fresh dull brownish yellow with nine thin lavender-gray stripes on side of body, with a prominent black spot on dorsal half of pectoral-fin base.
Description
Description. Dorsal rays XIV, 12 (one paratype with XIII, another with 11); anal rays II, 12 (one paratype with 11); all dorsal and anal rays branched, the last to base in some specimens; pectoral rays 18, the upper 2 and lowermost unbranched; pelvic rays I, 5; principal caudal rays 8 + 7 = 15; upper and lower procurrent caudal rays 5, the anterior 3 spiniform, the posterior 2 segmented and unbranched; tubed lateral-line scales 16
Distribution
Distribution. Observed or collected throughout the Caroline Islands, from Puluwat to Palau. A Chromis resembling the juvenile of this species was observed in Fagatele Bay in May 2001 by the senior author.
Etymology
Etymology. Named degruyi to honor Michael V. DeGruy, in recognition of the sincere enthusiasm and determination he demonstrated while attempting to collect the first adult specimen of this species.
Discussion
Remarks. The habitat of this species is similar to that of other species described herein: deep outer-reef slopes at depths of 85–120 m, usually in the vicinity of rock outcrops with small holes and caves, and around limestone talus. It is generally not as abundant as other species of Chromis described here, usually found in small groups and observed feeding low in the water column. The species appears most similar to other deep-dwelling species of Chromis described previously (see Remarks section of C. abyssus). Juveniles superficially resemble C. opercularis136 (Günther in Playfair and Günther 1867) in color, but are easily distinguished from that species on several morphological characters (e.g., usually XIV dorsal-fin spines in C. degruyi, vs. XIII in C. opercularis; body depth 1.84–1.99 in SL vs. 2.1–2.3 in C. opercularis), as well as adult coloration. Some aspects of the adult coloration are similar to C. planesi Lecchini and Williams 2004, but C. degruyi differs from that species in many other aspects of adult coloration as well as number of pectoral-fin rays (20 in C. planesi vs. 18 in C. degruyi), dorsal-fin soft rays (usually 13vs. usually 12), and tubed lateral-line scales (17vs. usually 15–16).
Taxon Treatment
- Richard L. Pyle; John L. Earle; Brian D. Greene; 2008: Five new species of the damselfish genus Chromis (Perciformes: Labroidei: Pomacentridae) from deep coral reefs in the tropical western Pacific, Zootaxa 1671: 18-21. doi
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