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Actinopterygii: Teleostei: Platycephalidae), with Title Comments on the Composition of the Type Series

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Actinopterygii: Teleostei: Platycephalidae), with Title Comments on the Composition of the Type Series Rediagnosis of the Marbled Flathead, Platycephalus marmoratus (Actinopterygii: Teleostei: Platycephalidae), with Title Comments on the Composition of the Type Series Author(s) Imamura, Hisashi Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history Citation research of animals, 11(4), 295-306 Issue Date 2006-11-30 Doc URL http://hdl.handle.net/2115/46801 Type article Fig. 1とFig. 2については，画像が不鮮明なため別ファイルをアップロードしています。適宜参照してくださ Note い。 Additional Information There are other files related to this item in HUSCAP. Check the above URL. File Information Imamura.2006.pdf Instructions for use Hokkaido University Collection of Scholarly and Academic Papers : HUSCAP Species Diversity, 2006, ll, 295-306 Rediagnosis of the Marbled Flathead, Platycephalus marmora- ius (Actinopterygii: Teleostei: Platycephalidae), With Comments on the Composition of仙e Type Series IIisashi Imamura The Hokkaido University Museum, Faculty of Fisheries, Hokkaido Um'uersity, 31111 MinatoICho, Hakodate, Hokkaido, 041-8611 Japan E-mail: imamura@museum. hokudai.ac.jp (Received 8 May 2006; Accepted 30 August 2006) The taxonomic characters of the marbled flathead, Platycephalus mar- moratus Stead, 1908, are described and evaluated. In addition to the marbled body and dark brown to black caudalBn, the following combination of char- acters separates it from the other 14 species of the genusPlalycephalus: 13 second dorsaland anal finrays; 63-70 scales in the lateral line, with all pored scales lacking spines; snout and interorbit naked; no strong canine teeth on the jaws, palatines, and vomer; interopercularflap absent; and skinny sen- Sory tubes on the suborbitals and preopercle partially covering the cheek re- gion. It has been con丘rmed that the type series of the species was composed of the holotype and one paratype,although the paratype is presumably no longer extant. Key Words: Actinopterygii, Platycephalidae, Platycephalus TnarmOratuS, taxonomic characters, diagnosis, redescription, paratype. In tro d uction Stead (1908) described a new species of flathead, Platycephalus marmoratus Stead, 1908, and proposed "marbledflathead" as its English name, in reference to the marbled markings on the body and head. No other species of Platycephalus Bloch, 1795 lsensu Imamura (1996), who synonymized Neoplatycephalus Castelnau, 1872 under the genus】 has a marbled pattem on the body and head. In alcohol, spec- imens of Platycephalus marmoratusalSo have a more extensive area of dark brown to black in the caudalfin than is present in other species of Platycephalus.Al- though P. marmoralus is easily distinguished from its congeners when coloration is reasonably well retained, these characters may not be available in long-pre- served specimens (for example, the holotype of this species is considerably faded) (Fig. 1). Although several authors have briefly described some or the morphologi- cal characters of P. marmoraius, e.g,, Knapp (1991) and Imamura (1996), who pro- vided selected meristic values, and osteological and mycological characters, re- spectively, no study has compared P. marmoratus with its congeners in detail. The purpose of this study is to redescribe Platycephalus marmoratus based on the holotype and other material, Compare its taxonomic characters (other than color) with other species of Platycephalus, and present an emended diagnosis. Also, the statusof the paratype ofP. marmoratus is clarified and a previous inter- 296 Hisashi lmamura pretation of composition of the type series is corrected. Materials and Methods Counts and measurements were made fわllowing Hubbs and Lagler (1958). Gill Takers were counted on the right side. Measurements were made with calipers to the nearest 0.1mm. Length of the arst dorsal an base excludes the isolated spine between the dorsalfins. Terminology of head spines follows Knapp et al. (2000). Institutional acronyms are from Leviton et al. (1985) except for SAIAB (South African Institute for Aquatic Biodiversity, formerly RUSI). Standard and head lengths are abbreviated as SL and HL, respectively. Taxonomic Account Platycephalus marmoratus Stead, 1908 (Figs l一端) Platycephalus marmoratus Stead, 1908: 9, pls 3-5 (type locality: Port Stephens, Aus- tralia); McCulloch 1929: 402; Coleman 1980: 109, an unnumbered color agure; Hutchins and Thompson 1983: 78, ag. 112; Hutchins and Swainston 1986: 127, fig. 204; Paxton et al. 1989: 469; Knapp 1991: 29; Kuiter 1993: 104, two unnum- bered color Bgures; Imamura 1996: 125; Hutchins 2001: 28; Grant 2004: 196, pl. 89, an unnumbered color plate. Material examined. Holotype: AMS I.15260, 310.4mm SL, Port Stephens, June 1904. 0ther material. Seven specimens, all collected from New South Wales, Aus- tralia: AMS I.15279, 471.6mm SL, data unknown, con. D. Stead; AMS I.20721-002, 270.9mm SL, Coffs Harbour, 30018'S, 153008'E, 80m depth, 13 August 1978, colt. I. Hooper; AMS I.20870-001, 151.8mm SL (dissected by lmamura 1996), Bondi Beach, Sydney, 33053'S, 151015'E, 30 0ctober 1977, coll. R. Kuiter; AMS I.22129-004, 309.5mm SL, North Coast, 1978, coll. J. Hooper; AMS I.25663-013, 169.5mm SL, southeast of Yamba, 29034'S, 153025'E, 49-53m depth, 24 March 1985, coil. FRV Ka- pala; AMS I.25665-026, 184.6mm SL, northeast of Yamba, 29021′S, 153029′E, 49-51 m depth, 21 May 1985, colt. FRV Kapala', AMS I.27322-006, 173.Omm SL, off Tuncurry, 32008'S-32006′S, 152031′E-152033′E, 26A7m depth, 1 October 1985, coll. FRV Kapala. Diagnosis (emended). A species of Platycephalus with 13 second dorsal and anal an rays; 63-70 pored scales in lateral line, each with one exterior opening pos- teriorly and lacking spine; 2+8-ll (7-ll in Knapp 1991) gill rakers; snout and in- terorbit naked; lower opercular spine slightly longer than upper one; no strong ca- nine teeth on Jaws, palatine, or vomer; interopercular nap absent; margln Of in- teropercle not scalloped; skinny sensory tubes from suborbitals and preopercle partially covering cheek region. Description. Data are presented丘rst for all specimens, then for the holotype (in parentheses). Counts: dorsal an spines I-ⅤⅠ-ⅤⅠH or ∫-ⅤⅠⅠ-ⅤⅠⅠⅠ (Ⅰ-ⅤⅠⅠ); second dorsal丘n rays 13 Taxonomic characters or a platycephalid 297 Fig. 1. Platycephalus marmoratus Stead, 1908, AMS I.15260, holotype, 310.4mm SL, Port Stephens, NSW, Australia, entire animal in dorsal vieⅥ∴ Fig. 2. Platycephalus marmoratus Stead, 1908, AMS I.256651026, 184.6mm SL, northeast of Yamba, NSW, Australia, entire animal in dorsal (upper), lateral (middle), and ventral (lower) VleWS. 298 Hisashi lmamura C二つ 3mm Fig. 3. Iris lappet (left eye) of Platycephalus marmoratus Stead, 1908, AMS I.25665-026, 184.6 mm SL, northeast or Yamba, NSW, Australia. (13); anal an rays 13 (13); pectoral an rays 1-2 (upper, unbranched)+ll-14 (middle, branched)+仁一8 (lower, unbranched)-20-22 (2+12+7-21); pelvicfin rays I, 5 (I, 5); branched caudalfin rays 5-渇(upper)+5-づ(lower)-1ト12 (6+6-12); pored scales in lateral line 63-70 (66), au scales without spines; Oblique body scale rows slanting downward and backward above lateral line 107-119 (108); gill rakers 2+8-ll-1仁一13 (2+8-10). Proportions as % SL: HL 28.1-29.7 (28.9); predorsal length 31.5133.6 (32.6); length offirst dorsalfin base 15.8120.4 (17.7); length of second dorsalfin base 34.91 36.5 (36.1); length of analfin base 38.3AO.8 (38.8); caudal peduncle length 6.9-10.6 (7.9); caudal peduncle depth 3.8A.4 (3.8); snout length 8.8-9.4 (9.2); orbital diameter 4.5-5.9 (4.9); upper jaw length ll.1-12.3 (ll.5); lower jaw length 15.4-16.2 (15.4); in- terorbital width 3.8J.3 (5.1); postorbital length 14.1-15.8 (15.2); suborbital width 2.5-3.0 (2.8); pectoralfin length 13.5-15.9 (14.2); pelvicfin length 21.9-24.1 (22.1); cau- dal丘n length 15.5-19.8 (17.5); length offirst spine offirst dorsalfin 0.6-3.2 (0.6); length of second spine offirst dorsal丘n 13.4-14.8 (14,8); length offirst ray of second dorsalfin 7.2-13.1 (10.7); length offirst analfin ray 6.8-10.1 (6.8). Proportions as % HL: snout length 29.8-32.3 (31.9); orbital diameter 15.2-20.1 (16.8); upper jaw length 38.1-42.1 (39.8); lower jaw length 53.3155.5 (53.3)･, interor- bital width 13.6-21.4 (17.6); postorbital length 50.1-53.4 (52.5); suborbital width 8.3- 10.2(9.7). Body greatly depressed, mostly covered with ctenoid scales, but some cycloid scales on undersurface. Head greatlyflattened, length 3.4-3.5 (3.5) in SL; snout and interorbit naked, occipital reglOn With or without several scales embedded under skin (without), nape mostly scaled. Snout robust, longer than eye diameter, length 3.113A (3.1) in HL. Upper surface of eye without papillae. Iris lappet usually broad, well expanded and simple dorsally, and broad, simple, and weakly convex ven- trally (Fig. 3), Weakly concave dorsally only in AMS I.22129-004. 1nterorbital width 4.7-7.4 (5.7) in HL, varying with growth, smaller than orbital diameter in smaller specimens, becoming larger than orbital diameter by 270mm SL Spines and ridges weakly developed on top and side of head (Fig. 4). Nasal lacking spines. Lachrymal with single antrorse splne. Single preocular spine present. Suborbital and supraor- bital ridges entirely smooth. Single postorbital splne With broad base present in Taxonomic characters of a platycephalid 299 Fig. 4. Dorsal view of head of Platycephalus marmoratus Stead, 1908, AMS I.25665-026, 184.6 mm SL, northeast of Yamba, NSW, Australia. Abbreviations: LAC, lachrymal; LO, lower oper- cular; NC, nuchal; PO, preopercular; PRO, preoc山ar; PSO, postocular; UO, upper opercular. smaller specimens, blunt, obscure, or absent in largest specimens (blunt). Pterotic, frontal, and supraoccipital with entirely smooth ridges.
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