Lentipes ikeae, Keith & Hadiaty & Hubert & Busson & Lord, 2014

Keith, Philippe, Hadiaty, Renny K., Hubert, Nicolas, Busson, Frédéric & Lord, Clara, 2014, Three new species of Lentipes from Indonesia (Gobiidae), Cybium 38 (2), pp. 133-146 : 143-145

Lentipes ikeae , n. sp. Keith, Hubert, Busson & Hadiaty

( Figs 7-9 , Tabs V-VII)

Comparative material

The new species is compared with Lentipes species having no enlarged lobes associated with the urogenital papillae or elongate finger like projections in males, having a urogenital papilla in both sexes that is retractable into a sheath-like groove, and having 15-17 pectoral rays. These species are Lentipes dimetrodon , Lentipes watsoni , and L. argenteus n. sp. in this paper.

Material examined

Eleven specimens from Java, totalling 6 males, 5 females; size range 29.7-38.0 mm SL [34.5-44.8 mm, total length (TL)], largest male 32.5 mm SL, largest female 38.0 mm SL.

Holotype. - MZB 21477, male (32.4 mm SL), Cisolok, Kab Sukabumi , Java, 13 Dec. 2013, Hubert et al. coll; BIF 1792.

Paratypes. - MZB 21387, 2 males (29.7-32.5 mm SL), Cisukawayana, Kab Sukabumi, Java, 12 Dec. 2013, Hubert et al. coll; BIF 1730, 1732. MZB 21388, 3 females (36.9- 37.6 mm SL), same data as holotype; BIF 1796, 1801, 1802. MNHN 2013-073, 2 males (31.3-32.5 mm SL), Cisukawayana , Kab Sukabumi , Java, 12 Dec. 2013; Hubert et al. coll; BIF 1731, 1733. MNHN 2013-650, 1 male and 2 females (32.0- 37.8 mm SL), same data as holotype; BIF 1793, 1794, 1795 .

Diagnosis

The new species has 16-17 pectoral rays, a second dorsal and anal fins with I,9, and 23-35 lateral scales. The urogenital papilla is retractable into a sheath-like groove and is without lobes or other expanded tissue. The base of the first dorsal fin is not reaching (or slightly reaching) the base of the second dorsal fin origin in both sexes. The male has a specific body colour, with a blue belly, a second dorsal fin with one or two black spots, and a more or less visible bright red band on caudal peduncle.

Description

The number of pectoral rays in Lentipes species are given in table I, the number of upper jaw teeth in table V, meristic counts in table VI, and morphometrics expressed to the nearest whole percent of standard length in table VII. Below, the holotype counts are given first, followed in brackets if different, by paratype counts.

First dorsal fin (D1) with 6 flexible spines, second dorsal fin (D2) with one flexible spine and 9 segmented rays (D VI-I,9). Anal fin with one flexible spine and 9 segmented rays (A I,9) and directly opposite to second dorsal fin. Base of first dorsal fin not reaching (or slightly reaching) base of second dorsal fin origin in both sexes; spines not filamentous in both sexes. 5 th ray of first dorsal fin the longest in males. Pelvic fins constitute a strong adhesive disc adherent to abdomen between all five rays. Pectoral fin with 16-17 rays, ventralmost 1 st or 2 nd rays simple; posterior margin slightly straight. Caudal fin (C) with 13 branched rays.

Lateral scales (LS) 30(23-35). They are lightly embedded and mainly cycloid in female. Generally not limited to caudal peduncle, many extend anteriorly along midline between second dorsal and anal fins; some ctenoid scales are on the anteriormost part of the flanks. Males have some ctenoid scales, not strongly developed, along midline and beyond the base of pectoral fins. Cycloid scales on caudal peduncle. Scales in transverse backwards (TRB) series 4 (4-8) and in transverse forward series (TRF) 2 (0-7). Zigzag scales (ZZ) 9 (8-10). Head, breast, nape and belly without scales. Upper jaw teeth distinctly tricuspid anteriorly, males 13 (11-22), females (27-35). Premaxilla in males with 3 (3-6) recurved canines posterior to tricuspid teeth; females without teeth posterior to tricuspid teeth. Teeth in lower jaw recurved and canine in males 2 (2-5), no teeth in females. Cephalic sensory pore system A, B, C, D, F, H, K, L, N and O; pore D singular with all others paired ( Fig. 8 ); oculoscapular canal divided into anterior and posterior canal between pores H and K. Sensory papillae well developed on head and body.

Sexual dimorphism well developed. Second dorsal and anal fin lengths, jaw length, predorsal length, head length and caudal peduncle depth greater in males. Urogenital papilla in males slender and pointed distally without associated lobes or expanded tissue ( Fig. 9A ), urogenital papilla retractable into a sheath-like groove; female urogenital papilla rectangular in appearance ( Fig. 9B ) and also retractable into a sheath-like groove.

Colour in preservation

Male. - Background of body greyish. Background of head greyish to whitish. Head ventrally greyish, isthmus whitish. Flanks greyish on anterior and middle part; caudal peduncle pinkish. Top of head greyish. Nape greyish. Caudal fin rays greyish to blackish. Dorsal and anal fins blackish. Pelvic disk without pigment. Pectoral rays greyish. Pectoral fin base greyish.

Female. - Mostly greyish. Head and body greyish to whitish. Belly greyish. More or less lateral midline with a black subcutaneous band. Caudal fin rays greyish. Dorsal rays and spines blackish, membrane and rays distally with pigment. Caudal fin rays whitish. Anal fin without pigmentation at base of rays and spine. Pelvic disc not pigmented. Pectoral rays and membrane greyish. Pectoral base greyish.

Colour in life ( Fig. 7 )

Male. - Background of body greyish. Background of head and snout greyish. Dorsal and ventral margin of head greyish; opercula dark greyish. Lateral midline greyish. Dorsal fins black with a white margin. Belly bright blue. A yellow to green patch at pectoral base. The second black dorsal fin with one or two black spots rounded with a white margin. A more or less visible vertical bright red band on caudal peduncle. Caudal and pectoral fins translucent. Anal fin greyish.

Female. - Greyish with markings appearing similar to that in preservation.

Distribution Currently known from Java and Bali ( Indonesia).

Ecology

Lentipes ikeae was collected in small and rapid mountain stream with a rocky bottom and boulder-strewn at an altitude ranging between 310 and 488 above sea level. It is presumed to be amphidromous as the other members of the subfamily ( Keith and Lord, 2011b).

Comparison

Lentipes ikeae differs from L. kaaea , L. rubrofasciatus , L. solomonensis and L. whittenorum in not having enlarged lobes associated with the urogenital papilla in males. It differs from L. adelphizonus in not having elongate finger like projections anterior to the urogenital papillae in males. It differs from L. armatus , L. venustus , L. multiradiatus in having 16-17 pectoral fin rays vs. 17-20 and a second dorsal fin I,9 vs. I,10.

Lentipes ikeae differs from L. dimetrodon in having more scales in lateral series (23-35 vs. 14-20), generally the 4 th and 5 th spines of D2 longer vs. the 5 th and 6 th spines of D2 longer, and the coloration in males. Furthermore, it differs from L. watsoni in having D2 I9 and A I9 vs. D2 I10 and A I10, fewer teeth in upper jaw in females (27-35 vs. more than 39), fewer scales in lateral scales (23-35 vs. 35-39), in transverse backwards (TRB) series (4-8 vs. 11-13) and in transverse forward series (TRF) (0-7 vs. 8-10). It differs from L. argenteus n. sp. (this paper) in having fewer scales in lateral series (23-35 vs. 35-49), a smaller distance between the bases of D1 and D 2 in males [nearly touching vs. about half (or more) the eye diameter]; a greater peduncle depth in both males and females (10-12 vs. 7-9/ 9-11 vs. 7% SL, respectively), a smaller caudal peduncle length in males (13-17 vs. 17-21), and the coloration in male.

Etymology

The new species is named for Miss Ike Rachmatika, the late staff of Ichthyology lab in MZB, to honour her work and passion for the freshwater fish of Indonesia.

Acknowledgements. – We wish to thank Laurent Pouyaud, Jean-Paul Toutain and Domenico Caruso for their support. We also thank Sopian Sauri , Aditya Hutama and Sumanta for their help during field sampling in Java, M. Negrini for the samples of Sumatra. Part of the present study was funded by the MNHN (UMR 7208 BOREA), the ‘ Institut de Recherche pour le Développement’ (UMR ISEM), the Indonesian Institute of Sciences ( LIPI) , the French Ichtyological Society ( SFI) and the Fondation de France. This study has been approved by the Indonesian Ministry of Research and field sampling has been conducted according to the research permits 440/SIP/FRP/SM/ XI/2013 for Philippe Keith and Frédéric Busson , and the research permit 68/EXT/SIP/FRP/SM/ VIII/2013 for Nicolas Hubert. For fish collected under the ICBG Indonesia project, we thank the coordinators Rosichon Ubaidillah , Elizabeth Wijaya , Alan Hitch and Andy Engilis for the nicely coordination of the field trip in Sulawesi. Thanks also to Adri from Forestry Dept in Kendari for the nice field trip in Mekongga. We wish to thank RISTEK and LIPI for the research permits and supporting letter, and Daisy and Sopian. Finally , we thank for the loan of specimens: S. Morrison ( WAM) ; P. Pruvost, R. Causse, Z. Gabsi, C. Ferrara, and for X-rays, M. Hautecoeur ( MNHN) . The number ISEM 2014-058 is associated to this publication.

Figures

Figure 7. - Lentipes ikeae. A: Male (picture by F. Busson); B:Above, male, Paratype MZB 21387 (picture by N. Hubert; BIF 1730); Below, female (picture by N. Hubert; BIF 1747).

Figure 8. - Diagrammatic illustration of head in Lentipes ikeae (male) showing head pores and sensory papillae. A: Dorsal view; B: Lateral view.

Figure 9. - Diagrammatic illustration of urogenital papilla in Lentipes ikeae. A: Male; B: Female. 1: anus; 2: urogenital papilla; 3: anal fin.