Balitoropsis ophiolepis ( Bleeker 1853 )

Randall, Zachary S. & Riggs, Patrick A., 2015, Revision of the hillstream lizard loaches, genus Balitoropsis (Cypriniformes: Balitoridae), Zootaxa 3962 (1), pp. 206-225 : 219-223

publication ID

https://dx.doi.org/10.11646/zootaxa.3962.1.13

publication LSID

lsid:zoobank.org:pub:FBCF7375-8ADD-4624-9DD8-1A5427B5FB9A

DOI

https://doi.org/10.5281/zenodo.5658191

persistent identifier

https://treatment.plazi.org/id/E858315A-B423-BB26-FF17-1918FE5144F8

treatment provided by

Plazi

scientific name

Balitoropsis ophiolepis ( Bleeker 1853 )
status

 

Balitoropsis ophiolepis ( Bleeker 1853)  

Slender Lizard Loach ( Figures 6 View FIGURE 6 B, 9 & 11)

Homaloptera ophiolepis Bleeker 1853: 160   (type locality: Indonesia: Java: Bandong [Bandung]; lectotype: RMNH 4986; designated by Alfred 1961: 35.

Balitoropsis ophiolepis   . — Kottelat 2012: 46.

Remarks. In the description of H. ophiolepis Bleeker 1853   , two individuals 100 and 83 mm in total length from the type locality (Bandung, Java) were examined. Gunther (1868) assumed that one of the specimens sent to him by Bleeker was the type ( Norman and Whitehead 1984: 305), and recognized it as the holotype (catalog number not listed, but it would correspond to BMNH 1866.5. 2.48 [1]). However, according to Alfred (1961), Bleeker, faced with a shortage of collecting jars, would at times place specimens from several localities (including type localities) into the same jar. The specimen assumed by Gunther to be the type ( BMNH 1866.5. 2.48 [1], 109 mm TL) is likely one of five specimens collected by Bleeker from Lahat, Sumatra ( Bleeker 1860). Alfred (1961) examined Bleeker’s specimens at BMNH and RMNH and assigned type status to specimens that closely matched the description of H. ophiolepis Bleeker 1853   . RMNH 4986 (98 mm TL) was designated lectotype ( Fig. 9 View FIGURE 9 A), and RMNH 1929 (82 mm TL) paralectotype. Both the lectotype and paralectotype are presumed to have been stored together with RMNH 4623, based on the label in Figure 9 View FIGURE 9 B, which was found in RMNH 4986. RMNH 4623 consists of three individuals examined by Bleeker from Lahat, Sumatra, and are not types.

The lateral view of B. ophiolepis   in Bleeker (1863 –1864, Tab 3) is labeled 4 instead of 3 ( Fig. 10 View FIGURE 10 ), identifying it as Homaloptera ocellata   van der Hoeven (1830) (see also Gunther 1868). Oijen and Loots (2012, figs. 13, 14) repeated the error made by Bleeker (1863 –1864) in reversing the figures of B. ophiolepis   and H. ocellata   .

Diagnosis. See B. zollingeri   diagnosis and Table 3.

Description. Dorsal, lateral, and ventral views of B. ophiolepis   are shown in Figure 11 View FIGURE 11 . Measurements and meristic counts are given in Table 4. Body long and compressed (body depth 9.2–11.9 % SL). Head with two rows of prominent tubercles longitudinally between nares. Eyes dorsolateral, shorter than interorbital width. Rostral cap large. Dorsal-fin origin anterior to pelvic-fin origin. Pectoral fin small reaching about midway to pelvic fin. Pelvic fin small reaching far past anus. Anus closer to pelvic-fin base than to anal-fin origin. Axillary pelvic lobe absent. Caudal fin forked with rounded lobes; lower lobe longer.

Dorsum with large keeled scales; up to 8 keels per scale. Larger individuals with hypertrophied keels ( Fig. 11 View FIGURE 11 ). Scales on ventral surface posterior to anus with keels, deeply embedded between pectoral and pelvic fins. Total lateral-line scales 48–55, predorsal scales 12–15, circumpeduncular scales 13–14. Scales above and below lateral line 6–7 / 4–6, respectively. Scales below lateral line to pelvic-fin origin 5–6. Modal fin-ray counts (variation given in Table 4): dorsal iii, 8 ½; anal ii, 5 ½; pectoral iv, 10, i; pelvic ii, 8; total caudal 17.

MORPHOMETRICS Lectotype Bleekerspecimen Non-types

n= 7

RMNH 4986 BMNH 1866.5. 2.48 USNM 230251 Adult Range Adult

Mean±%SD

Standard Length 79.4 93.6 34.7 60.5-101.2 Length n/a 109.4 43.2 78.2-127.4 of Standard Length

Lateral head length 18.8 19.7 21.2 17.7-20.4 19.3 ± 1.3 Body depth 9.2 10.2 9.7 10.5-11.9 11.2 ± 0.8 Body width 11.3 14.5 11.1 12.2-14.7 13.0± 1.2 Distance from pelvic fin to anal fin 29.6 29.8 29.3 29.5-31.2 30.3 ± 0.7 Dorsal-fin base length 13.9 13.4 14.8 13.2 -15.0 14.0± 0.7 Dorsa-fin length 17.8 19.8 23.5 19.9 -22.0 21.3 ± 1.2 Pectoral-fin length 19.4 19.3 19.6 18.6-20.2 19.4 ± 0.6 Pelvic-fin length 17.0 17.4 18.5 17.0- 18.4 17.8 ± 0.6 Anal-fin length n/a 12.2 13.4 12.0- 14.6 12.8 ± 0.9 Predorsal length 42.6 45.1 44.9 43.5-45.4 44.7 ± 0.7 Caudal-peduncle length 15.5 18.5 20.4 18.2-19.9 19.2 ± 0.9 Caudal-peducle depth 4.0 4.8 4.6 4.7-5.1 4.8 ± 0.2 of Head Length

width 67.8 65.8 67.9 70.7-76.5 72.3 ± 2.9 depth 33.6 43.4 40.8 43.8-49.5 45.1 ± 2.8 Snout length 56.4 54.9 59.9 55.7-58.2 57.6 ± 1.4 Length of orbit 20.8 16.5 21.7 15.7-19.5 18.1 ± 2.1 Interorbital width 34.2 33.7 35.3 33.0- 38.7 36.0± 1.8 Pectoral-fin length 103.4 98.3 92.4 92.9-112.8 101.3 ± 7.4 of Interorbital Width

Length of oribit 60.8 48.9 61.5 42.6-59.2 50.4 ± 7.2

…Continue on next page Mouth ( Fig. 6 View FIGURE 6 B) inferior, lips with tiny unculi, continuous around corners of mouth. Upper lip crenulated, distal-lateral extension of lower lip common. Fleshy pad present between lateral halves of lower lip. Rostral and post-labial grooves present. Two pairs of rostral barbels, one pair of maxillary barbels. Barbels with tiny unculi, rostral barbels in close proximity to each other.

The smallest individual of B. ophiolepis   ( Fig. 11 View FIGURE 11 B) differs in measurements and meristic counts from the larger individuals ( Table 4). Major differences are: 55 vs. 48–52 total lateral-line scales, scales on ventral surface anterior to pelvic fin absent vs. present, scales with 1 vs. up to 8 keels.

Color in 70 % ethanol ( Fig. 11 View FIGURE 11 ): Dorsally light cream-brown with dark brown stippling. Six dark brown saddles usually present. First saddle between supraoccipital and dorsal fin; 2 nd saddle at dorsal-fin origin; 3 rd saddle at end of dorsal fin; 4 th saddle anterior to anal-fin origin; 5 th saddle at end of anal-fin; 6 th saddle immediately anterior to caudal-fin base. One individual has an extra saddle between saddles 5 and 6. Light brown mid-dorsal stripe extends from supraocciptal to posterior saddles. Large blotches sometimes surround anterior saddles. Two large blotches extend posteriorly from each side of the supraoccipital and often join the post-orbital bar. Large blotch on head between post-orbital bars and nares, at the nares and opercle. Tip of snout with two lateral blotches divided by cream-colored bar.

Lateral-line covered with large blotches, usually positioned between saddles, decreasing in size posteriorly. Venter cream-colored and lightly stippled. Undersurface of head lightly stippled.

Number of dark brown bands on fins: dorsal 4–5; pectoral 4–5; pelvic 3–5; anal 2–3; caudal 4–6. Dark brown bands at upper lobe of caudal fin of some individuals faint. Dorsal, pectoral, and anal fins with black base. The smallest individual ( USNM 230251, 34.7 mm SL) differs slightly in color having a less pronounced 6 th dorsal saddle at caudal-fin base; 2 bands on dorsal, pectoral, pelvic, caudal (?) (lower lobe missing) fins; 1 band on anal fin.

Distribution and Ecological Notes. No recent collections are known from the type locality of Bandung, Java, and the species has likely been extirpated from this highly developed area. The species is known to occur in Java: West Java (Tjitaroem basin); Sumatra: Sumatera Selatan (Musi basin) and Lampung (Tulangbawang basin); Borneo: Kalimantan Barat (Kapuas basin) ( Fig. 8 View FIGURE 8 ). The species has been collected from rocky riffles with swift currents.

Material examined. Balitoropsis ophiolepis   : Java: RMNH 4986 (lectotype of Homaloptera ophiolepis   ); BMNH 1866.5. 2.48 (Bleeker specimen) (1). Sumatra: UF 166109 View Materials (3), 166103 (1), 166101 (1). Borneo: RMNH 28866 (1); USNM 230251 (1).

RMNH

National Museum of Natural History, Naturalis

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Cypriniformes

Family

Balitoridae

Genus

Balitoropsis

Loc

Balitoropsis ophiolepis ( Bleeker 1853 )

Randall, Zachary S. & Riggs, Patrick A. 2015
2015
Loc

Balitoropsis ophiolepis

Kottelat 2012: 46
2012
Loc

Homaloptera ophiolepis

Alfred 1961: 35
Bleeker 1853: 160
1853