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Three New Species of the Shrimp-Associated Goby Genus Vanderhorstia (Perciformes: Gobiidae: Gobiinae) from Japan, with Re-Descriptions of Two Related Congeners

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Three New Species of the Shrimp-Associated Goby Genus Vanderhorstia (Perciformes: Gobiidae: Gobiinae) from Japan, with Re-Descriptions of Two Related Congeners Bull. Natl. Mus. Nat. Sci., Ser. A, Suppl. 1, pp. 185–205, March 22, 2007 Three New Species of the Shrimp-associated Goby Genus Vanderhorstia (Perciformes: Gobiidae: Gobiinae) from Japan, with Re-descriptions of Two Related Congeners Akihisa Iwata1, Koichi Shibukawa2 and Nobuhiro Ohnishi3 1 Division of Southeast Asian Area Studies, Kyoto University, 46 Shimoadachi-cho, Yoshida, Sakyo-ku, Kyoto 606–8501, Japan E-mail: [email protected] 2 Department of Zoology, National Museum of Nature and Science, 3–23–1 Hyakunin-cho, Shinjuku-ku, Tokyo 169–0073, Japan E-mail: [email protected] 3 Department of Bioenvironmental Design, Faculty of Bioenvironmental Science, Kyoto Gakuen University, 1–1 Nanjyo Otani, Sogabe-cho, Kameoka City, Kyoto 621–8555, Japan Abstract Three new species of the shrimp-associated goby genus Vanderhorstia are described based on the specimens collected from the southwest coast of Kochi Prefecture, Shikoku, Japan. Within the genus, these 3 species are assigned to the phenetically close-knit subgroup (named “large-scale group”), characterized by having the combination of 11 or 12 segmented rays on sec- ond dorsal fin and 26–45 longitudinal scale count, as well as relatively reduced sensory-papillae rows below eye. Vanderhorstia hiramatsui sp. nov. (2 specimens, 62.9–65.1 mm SL) differs from the other species of this subgroup in having 12 dorsal-fin soft rays (vs. almost always 11 in the lat- ter). Vanderhorstia kizakura sp. nov. (single specimen, 34.9 mm SL) is readily distinguished from the other congeners in having separated pelvic fins (i.e., connecting membrane between innermost pelvic-fin soft rays greatly reduced). Vanderhorstia rapa sp. nov. (single specimen, 50.3 mm SL) closely resembles V. auropunctata in squamation (e.g., entirely or almost naked predorsal midline, and naked pectoral-fin base) and meristic counts (33–35 longitudinal scale count, 11–12 transverse scale count from origin of second dorsal fin backward and downward to anal-fin base), but differs from the latter in having a deep trough along posterior margin of eye (vs. undeveloped in the lat- ter), larger jaws (jaw length 50.8% of head length vs. 43.9–44.1%), and first dorsal fin with minute yellow spots only (vs. narrow yellow lines on distal half). The large-scale group of Vanderhorstia is re-defined, 2 poorly-known congeners (i.e., V. longimanus and V. puncticeps) are re-described, and a key to all-known species of this subgroup is also provided. Key words : Vanderhorstia, new species, Gobiidae, shrimp-associated goby. Fishes of the Indo-Pacific gobiid genus Van- fin pterygiophores anterior to first haemal spine, derhorstia Smith, 1959 are small- to moderate- and single epural; wide gill opening, extending sized marine gobies, symbiotically associated anteriorly to well beyond a vertical line through with alpheid shrimps (snapping shrimps or pistol posterior preopercular margin; branchiostegal shrimps). The genus currently recognized is char- membranes narrowly attached to isthmus (not acterized by having the following combination of forming free rear margin across isthmus); first characters (Shibukawa and Suzuki, 2004; present gill slit moderately broad, i.e., ventral one-third study): typical “Priolepis Group” type of axial or less of lower arch closed by membrane; no skeletal features (Birdsong et al., 1988), i.e., scales on cheek and operculum; relatively long 10ϩ16ϭ26 vertebrae, P-V 3/II II I I 0/9, 2 anal- caudal fin, longer than head; pelvic fins united 186 A. Iwata, K. Shibukawa and N. Ohnishi medially by well developed frenum (between peared to be not placed in the genus; these 2 spines) and interradial connecting membrane species should be assigned to the other shrimp- (between innermost rays) [note. —one of the associated goby genus Flabelligobius Smith, new species herein described has almost separat- 1956 or Tomiyamichthys Smith, 1956 (Shibukawa ed pelvic fin]; vomer and palatine edentate; lon- and Iwata, 2005, in prep.). gitudinal pattern of sensory-papillae rows on Shibukawa and Suzuki (2004) described the cheek; sensory-papillae row c oblique and mod- new species Vanderhorstia papilio based on a erately long, its terminus close to rows a and b single specimen collected from the Ryukyu Is- (row a apparently continuous with row c in some lands, Japan, and indicated that it was closed to species); row cp comprising a single papilla; a two Japan-endemic congeners, V. macropteryx pair of sensory papillae just behind chin (ϭrow and V. auropunctata, as well as a single unidenti- f ); cephalic sensory canals well developed, with fied species from Japan. These 4 species form a pores BЈ, C (unpaired), D (unpaired), E, F, G, HЈ, phenetically close-knit assemblage, sharing rela- KЈ, LЈ, MЈ, N and OЈ. The other shrimp-goby tively low number of longitudinal scale count genus Ctenogobiops Smith, 1959 resembles Van- (i.e., less than 40) and dorsal- and anal-fin seg- derhorstia in sharing most of these features, but mented rays (i.e., usually 11 or 12) and reduced the former is chiefly distinguished from the latter sensory-papillae rows below eye; this subgroup in having relatively shorter caudal fin (subequal was called as “large-scale group.” Shibukawa and or shorter than head in many species) and charac- Suzuki (2004) have overlooked another congener, teristic bright white spot on pectoral fin [recently V. longimanus, known from Indonesia and Aus- Randall et al. (2003) re-diagnosed Ctenogobiops, tralia, which also belongs to this subgroup. but we could not well separate Ctenogobiops More recently, Winterbottom et al. (2005) de- from Vanderhorstia based only on the characters scribed Vanderhorstia nannai as a new species they provided]. Also, Amblyeleotris Bleeker, from Palau and the Philippines. This species 1874, another Indo-Pacific shrimp-goby genus could be assigned to the large-scale group by with a pair of sensory papillae just behind chin having 11 dorsal/anal segmented rays and char- (Satapoomin and Winterbottom, 2002), differs acteristic configuration of sensory-papillae rows from Vanderhorstia and Ctenogobiops in having on cheek (e.g., row a comprising 3 or 4 widely- several transverse rows of sensory papillae on separated papillae), although it has slightly more cheek. The following 12 described species are longitudinal scale count (41–45) than the other currently assigned to Vanderhorstia (Shibukawa congeners assigned to this subgroup. and Suzuki, 2004; Winterbottom et al., 2005; Early in 2006, we had an opportunity to exam- Allen and Randall, 2006): V. ambanoro (Four- ine 2 specimens of a goby from Tosa Bay, off Pa- manoir, 1957); V. auropunctata (Tomiyama, cific coast of Shikoku, Japan, as well as the color 1955); V. bella Greenfield and Longenecker, photographs of one of them. Judging from its 2005; V. delagoae (Barnard, 1937) (ϭtype species characteristic coloration and the other general of Vanderhorstia); V. flavilineata Allen and Mun- physiognomy, the species was identified as Van- day, 1995; V. longimanus (Weber, 1909); V. derhorstia puncticeps (Deng and Xiong in Xu macropteryx (Franz, 1910); V. mertensi Klause- et al., 1980) that had been hitherto recognized as witz, 1974; V. nannai Winterbottom, Iwata and a species of Ctenogobius (Xu et al., 1980; Cheng Kozawa, 2005; V. nobilis Allen and Randall, and Zheng, 1987). These newly-obtained speci- 2006; V. ornatissima Smith, 1959; V. papilio mens also revealed that the unidentified species Shibukawa and Suzuki, 2004. Shibukawa and reported by Shibukawa and Suzuki (2004) was Suzuki (2004) suggested that Vanderhorstia conspecific with V. puncticeps. praealta Lachner and McKinney, 1981 and Van- In this paper, we describe 3 new species of the derhorstia lanceolata Yanagisawa, 1978 ap- large-scale group of Vanderhorstia from the New Species of Vanderhorstia 187 Japanese waters, re-describe 2 poorly-known fin; pectoral-fin length is the length of the longest congeners, i.e. V. longimanus and V. puncticeps, ray; pelvic-fin length is the distance between the and provided a key to all known species of the base of pelvic-fin spine and the distal tip of the large-scale group. All new species described in longest segmented ray; heights of pelvic-fin this paper were already reported by Senou et al. frenum and connecting membrane are least (2004) as 3 of 8 unidentified species of Vander- heights; lengths of fin spines and rays are the dis- horstia found in Japanese waters; the remaining tances between the base to distal tip of each ray. 5 do not belong to the large-scale group, and, Methods for counts follow Akihito (1984), ex- therefore, are not treated here. cept for the following: longitudinal scale count is the number of oblique (anterodorsal to pos- teroventral) scale rows and is taken from just dor- Materials and Methods sal to the upper attachment of the opercular Institutional abbreviations for materials exam- membrane posteriorly to the mid-base of caudal ined follow Leviton et al. (1985), except for the fin; 3 methods of transverse scale count were Kanagawa Prefectural Museum, Japan (KPM). taken (see descriptive accounts); circumpeduncu- Comparative materials of the species of Vander- lar scale count is the number of scales along a horstia are listed in Shibukawa and Suzuki zigzag vertical line through the narrowest point (2004), except as follows. Vanderhorstia aurop- of the caudal peduncle; gill rakers were counted unctata: KPM-NI 2791, 1 specimen, female, on the outer side of first arch, including all rudi- 58.7 mm SL, Suruga Bay, Ose-zaki, Shizuoka ments; count of pseudobranchial filaments in- Prefecture, Japan, 53 m depth, 8 Sept. 1996, col- cludes all rudiments. Pectoral- and branched cau- lected by H. Senou, M. Yanagita and A. Mishiku. dal-fin rays were counted and numbered from Vanderhorstia nannai: ROM 76552, holotype of dorsal to ventral. Scales (except for predorsal and Vanderhorstia nannai, 29.5 mm SL, west coast of circumpeduncular scales), paired-fin rays, gill Babeldaob, Aimeliik, Palau (7°72.3ЈN, 134°26.0Ј rakers and pseudobranchial filaments were count- E), 9.1–15.2 m depth, 19 May 2004, collected by ed bilaterally.
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