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Six New Species of the Genus Trimma (Percomorpha; Gobiidae) from the Raja Ampat Islands, Indonesia, with Notes on Cephalic Sensory Papillae Nomenclature

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Six New Species of the Genus Trimma (Percomorpha; Gobiidae) from the Raja Ampat Islands, Indonesia, with Notes on Cephalic Sensory Papillae Nomenclature aqua, International Journal of Ichthyology Six new species of the genus Trimma (Percomorpha; Gobiidae) from the Raja Ampat Islands, Indonesia, with notes on cephalic sensory papillae nomenclature Richard Winterbottom Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario, M5S 2C6; and Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, M5S 3G5. Email: [email protected] Received: 30 December 2010 – Accepted: 01 April 2011 Abstract by a relatively deep body, numerous irregular scales with Recent (2010) fieldwork in the Raja Ampat Islands of about 30 lateral rows and over 15 scales in the anterior trans- Indonesia resulted in the collection of seven undescribed verse series, a fifth pelvic fin ray that branches twice dichoto- species of Trimma, six of which are described here. Two of mously, usually a somewhat elongate second dorsal spine, no these are currently only known from these islands, the others predorsal, cheek or opercular scales, a moderately wide bony are known from other parts of the western Pacific. Trimma interorbital with a fleshy median ridge between the eyes, and cheni n. sp. is distinguished from other species of Trimma in a dermal ridge anterior to the first dorsal spine. There is a red having 8-9 scales in the predorsal midline, 2-3 scales on the spot or elongate blotch above the opercle in live and fresh opercle, an elongate second dorsal spine reaching posteriorly material, and the dorsal surface of the snout has a reticulated to the bases of rays 1-4 of the second dorsal fin, middle pec- dark pattern, with dark transverse stripes over the dorsal mar- toral fin rays branched, fifth pelvic fin ray branched once, a gin of the orbit. The species is known from south-western dark basal stripe in the dorsal fins, scale pockets indistinctly Sulawesi north to Palawan and eastwards to the Solomon outlined with darker pigment, and, in life, two red to orange Islands. Trimma papayum n. sp. is unique among the bars across the cheek and three diffuse yellow stripes on the described species of the genus in having a one-third pupil body (most obvious along the caudal peduncle). It has been diameter black ocellated spot on and just behind the fourth recorded from Palau, the Philippines, and Sulawesi and Flo- dorsal fin spine. It has 9 dorsal and 8 anal fin rays, a single res in Indonesia. Trimma erdmanni n. sp. has a reddish- branch point in the fifth pelvic fin ray, 10-11 anterior and 8- orange body with a dark red lateral stripe with darker borders 9 posterior transverse scale rows, 5-10 scales in the predorsal on the body which extends anteriorly onto the head, where it midline, and a single row of 3 scales on the upper margin of bifurcates, and there is a thin longitudinal light stripe below the opercle. Freshly collected specimens are orange red in the eye. It usually lacks scales in the predorsal midline, the overall colouration, with scattered diffuse yellow spots. The second spine of the first dorsal is elongated, there are 9 dorsal species is known only from Indonesia, at Maumere, Flores and 8 anal rays, a single branch in the fifth pelvic fin ray, and and Kawe Island, Raja Ampat. Trimma xanthochrum n. sp. is 19-22 gill rakers on the first gill arch. The species is known characterized by a wide interorbital region (80-100% pupil from the Raja Ampat islands, the Hermit Islands and diameter), a second dorsal spine usually reaching posteriorly Madang (Papua New Guinea), and from photographs from to between the bases of the second to third dorsal fin rays, 15- El Nido, Palawan Island and Davao Gulf, Mindanoro, 16 pectoral rays usually with 7-8 branched rays, vertical rows Philippines. Trimma habrum n. sp. has a bony interorbital of sensory papillae below eye of 2-3 papillae in rows 1-4 and width equal to the pupil diameter, 8-9 scales in the predorsal 4-5 in row 5, a caudal blotch which has a lower half about midline, 14 unbranched pectoral fin rays, an unbranched two-thirds the width of the upper half, and usually an overall fifth pelvic fin ray, no basal membrane joining the fifth pelvic yellowish body with yellow at least proximally in the caudal fin rays across the midline, usually a single full row of cheek fin. It is currently known with certainty only from the Raja scales, and scales on the upper two-thirds of the opercle. The Ampat islands. fresh colouration is diagnostic: a pale translucent dorsum with light yellow blotches and the base of each element of the Zusammenfassung dorsal fin surrounded by a red spot, a thin red bar along the Bei einer neueren Forschungsreise zum Raja-Ampat-Archi- posterior margins of the hypurals, no dark pigment at all on pel Indonesiens (2010) wurden sieben unbeschriebene the hypural region of the peduncle, and a darkly pigmented Trimma-Arten entdeckt, von denen sechs hier beschrieben covering to the dorsal margins of the swim bladder, neural werden. Zwei der neuen Arten kommen nach heutiger sheath, and the brain. It is currently known only from a sin- Kenntnis nur an diesen Inseln vor, die anderen sind auch von gle collection made at Kerou Island, Fam Islands in Raja anderen Teilen des Westpazifiks bekannt. Trimma cheni n. sp. Ampat, Indonesia. Trimma haimassum n. sp. is characterized unterscheidet sich von den anderen Trimma-Arten durch fol- 127 aqua vol. 17 no. 3 - 10 July 2011 Six n. sp. of the genus Trimma (Percomorpha; Gobiidae) from the Raja Ampat Islands, Indonesia, with notes on cephalic sensory papillae nomenclature gende Merkmale: 8-9 Schuppen auf der prädorsalen Mittel- streifen über dem rückwärtigen Rand der Augenhöhle. Man linie, 2-3 Schuppen auf dem Kiemendeckel, einen verlänger- fand diese Art am südwestlichen Sulawesi nördlich von Pala- ten zweiten Rückenstachel, der nach hinten bis zur Basis der wan und nach Osten zu an den Salomoninseln. Trimma Flossenstrahlen 1-4 der zweiten Rückenflosse reicht, ver- papayum n. sp. zeichnet sich unter den beschriebenen Arten zweigte mittlere Strahlen der Brustflosse, einmal verzweigten dadurch aus, dass sich auf und direkt hinter dem vierten fünften Bauchflossenstrahl, einen dunklen Streifen am Rückenflossenstachel ein schwarzer Augenfleck mit dem Grund der Rückenflossen, undeutlich mit dunklerem Farb- Durchmesser eines Drittels der Pupille befindet. Außerdem stoff umrahmte Schuppentaschen, außerdem beim lebenden haben Vertreter dieser Art 9 Rückenflossen- und 8 Afterflos- Tier zwei rote bis orangefarbene Bänder über die Wange hin- senstrahlen, nur einen Verzweigungspunkt beim fünften weg und drei schwach gelbe Streifen auf dem Rumpf (am Bauchflossenstrahl, 10-11 vordere und 8-9 hintere quer lau- deutlichsten sichtbar auf dem Schwanzstiel). Diese Art fende Schuppenreihen, 5-10 Schuppen auf der prädorsalen konnte bei Palau, den Philippinen und Sulawesi und an der Mittellinie und eine einzelne Reihe von drei Schuppen am Insel Flores in Indonesien nachgewiesen werden. Trimma erd- oberen Rand des Kiemendeckels. Frisch gefangene Tiere sind manni n. sp. hat einen rötlich orangefarbenen Rumpf und insgesamt orangerot, mit unregelmäßig verteilten schwach einen dunkelroten Seitenstreifen mit dunkleren Rändern auf gelben Flecken. Bisher ist die Art nur von Indonesien dem Rumpf, der sich nach vorne bis zum Kopf erstreckt, wo bekannt, von der Gegend der Inseln Maumere, Flores und er sich gabelt, außerdem einen dünnen hellen Längsstreifen Kawe im Raja-Ampat-Archipel. Trimma xanthochrum n. sp. unter dem Auge. Normalerweise fehlen hier Schuppen auf ist durch folgende Merkmale gekennzeichnet: breite Interor- der prädorsalen Mittellinie, der zweite Stachel der ersten bitalregion (80-100% des Pupillendurchmessers), einen zwei- Rückenflosse ist verlängert, die Rückenflossen haben 9 Flos- ten Rückenstachel, der normalerweise nach hinten bis zwi- senstrahlen, die Afterflosse 8, der fünfte Bauchflossenstrahl schen die Ansätze des zweiten und dritten Rückenflos- verzweigt sich einmal, und der erste Kiemenbogen trägt 19- senstrahls reicht, 15-16 Brustflossenstrahlen, in der Regel mit 22 Kiemenreusen. Fundorte dieser Art sind die Inseln Raja 7-8 verzweigten Strahlen, senkrechte Reihen von Sinnespa- Ampat, die Hermit-Inseln und Madang (Papua-Neuguinea) pillen unterhalb vom Auge – mit jeweils 2-3 Papillen in den sowie, durch Fotos belegt, El Nido, Palawan-Insel und der Reihen 1 bis 4 und 4-5 Papillen in Reihe 5 –, einen Schwanz- Davao-Golf, Mindanoro, Philippinen. Bei Trimma habrum fleck, dessen untere Hälfte etwa zwei Drittel der Breite der n. sp. entspricht die Breite des Interorbitalknochens dem oberen Hälfte einnimmt, sowie normalerweise eine gelbliche Pupillendurchmesser, Vertreter dieser Art haben 8-9 Schup- Gesamtfärbung auf dem Rumpf, die sich mindestens proxi- pen auf der prädorsalen Mittellinie, 14 unverzweigte Brust- mal in einem Gelbton auf der Schwanzflosse fortsetzt. flossenstrahlen, einen unverzweigten fünften Bauchflos- Gegenwärtig kennt man diese Art mit Sicherheit nur vom senstrahl, keine Basalmembran am fünften Bauchflos- Raja-Ampat-Archipel. senstrahl über die Mittellinie hinweg, normalerweise eine ein- zelne volle Reihe von Wangenschuppen und Schuppen auf Résumé dem oberen Zweidrittel des Kiemendeckels. Außerdem ist die Une récente collecte (2010) sur les Îles Raja Ampat d’Indo - Färbung lebender oder frischtoter Exemplare artkennzeich- nésie a permis la capture de sept nouvelles espèces de Trimma, nend: der Rücken blass durchscheinend mit hellgelben dont six sont décrites ici. Deux d’entre elles sont pour l’heure Flecken, die Basis von jedem Element der Rückenflosse von connues exclusivement sur ces îles, tandis que les autres peu- einem roten Fleck umrahmt, ein dünner roter Streifen ent- vent être trouvées dans d’autres parties du Pacifique Ouest. lang den hinteren Rändern der Hypurale, überhaupt kein Trimma cheni n. sp. se distingue des autres espèces de Trimma dunkles Pigment in der hypuralen Gegend des Schwanzstiels par 8-9 écailles sur la ligne médiane prédorsale, 2-3 écailles sowie eine dunkel pigmentierte Bedeckung der dorsalen Rän- sur l’opercule, un deuxième rayon épineux étiré sur la pre- der der Schwimmblase, der Nervenscheide und des Gehirns.
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