Paracanthocobitis zonalternans ( Blyth, 1860 )

Page, Lawrence M., 2017, A revision of the Paracanthocobitis zonalternans (Cypriniformes: Nemacheilidae) species complex with descriptions of three new species, Zootaxa 4324 (1), pp. 85-107: 91-94

publication ID

https://doi.org/10.11646/zootaxa.4324.1.5

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lsid:zoobank.org:pub:101B3Cb2-7D7E-4232-A4E4-Fca46D90Fdbe

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http://treatment.plazi.org/id/03858783-FFE8-8E25-58BF-FD77918BFB8E

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scientific name

Paracanthocobitis zonalternans ( Blyth, 1860 )
status

 

Paracanthocobitis zonalternans ( Blyth, 1860) 

Dwarf Zipper Loach

Fig. 4View FIGURE 4

Cobitis zonalternans Blyth, 1860:172  . Type locality: Tenasserim provinces, Burma. Two syntypes ( Day, 1869:551; Day, 1872:186), presumed lost ( Hora, 1929:319). Neotype, ZSM 27468, designated by Kottelat, 1990:42, Huai Mae Charno, 4 km south Amphoe Mae Ramat on road 1085 [approximately 16.967N, 98.567E], Tak Province, Salween drainage, Thailand.

Nemacheilus zonalternans  .— Day, 1869:551.

Nemachilus zonalternans  .— Day, 1889:232.

Noemacheilus zonalternans  .— Sen, 1985:119, fig. 63.

Acanthocobitis zonalternans  .— Kottelat, 1990:13.

Acanthocobitis (Paracanthocobitis) zonalternans  .— Grant, 2007:3.

Paracanthocobitis zonalternans  .— Singer & Page, 2015:396.

Diagnosis. Paracanthocobitis zonalternans  is distinguished from all other species of Paracanthocobitis  by combination of incomplete lateral line ending near dorsal-fin insertion; 9½–10½ branched dorsal-fin rays; axillary pelvic lobe present; series of black blotches, usually without black stripe but with faint dusky stripe, along side of body, usually ending near dorsal-fin insertion; circular black spot on upper margin of caudal-fin base; black pigment extending from lateral stripe onto pectoral-fin base; no marmorated pattern anterior to dorsal-fin origin; dorsal saddles short, rarely connecting to lateral blotches; 8 (occasionally 7) branched upper caudal-fin rays.

Description. Meristic and morphometric data are in Tables 4 and 5. Body deepest just anterior to dorsal-fin origin; slightly compressed before dorsal fin, strongly compressed postdorsally. Head depressed, snout gently rounded to slightly pointed when viewed dorsally or laterally. Dorsal-fin origin far in front of pelvic-fin origin; distal margin convex. Pectoral fin 0.17–0.26 SL, not reaching pelvic fin; pelvic fin 0.16–0.22 SL, not reaching anal fin; caudal fin emarginate.

Lateral line incomplete, reaching at most to dorsal-fin insertion; 19–50 pores. Axillary pelvic lobe present. Mouth arched with heavily papillated lips; upper lip with 3–5 rows of papillae, continuous with large pads on lower lip. Three pairs of barbels; inner rostral barbel extends to or slightly past base of maxillary barbel, maxillary barbel and outer rostral barbel extend to or slightly past eye. Body covered with scales; 9½ (12 specimens)–10½ (43 specimens) branched dorsal-fin rays; 9–12, usually 10, pectoral-fin rays; 6 pelvic-fin rays; 5½ branched anal-fin rays; 8 (occasionally 7) branched upper caudal-fin rays; 8 branched lower caudal-fin rays. Suborbital flap in male. Maximum SL 41.8 mm female.

Body yellow-brown with 10–15 dark brown to black blotches along lateral line sometimes overlain with faint dusky stripe usually ending near dorsal-fin insertion; 14–18 small dark brown dorsal saddles. Dark spots and blotches on head; uninterrupted black bar from eye to tip of snout. Ocellus with black center near upper margin of caudal peduncle; 3–6 concentric rows of dark spots in dorsal fin, 2–3 rows of dark spots in anal fin, 4–6 dark bands on caudal fin. Dusky lateral stripe extending onto pectoral-fin origin.

pecies P. zonalternans  x¯± D P. phuketensis  x¯± D P. marmorata  x¯± D P. triangula  x¯± D P. nigrolineata  x¯± D

(n=55) (n=55) (n=4) (n=11) (n=79)

tanđarđ lenǥth 20.5,41.8 17.1,³³.³ 28.2,³³.9 24.6,29.2 21.5,42.4

L Comparisons. Paracanthocobitis zonalternans  differs from all other species of Paracanthocobitis  except P. phuketensis  , P. nigrolineata  , P. triangula  , and P. marmorata  in having an incomplete lateral line ending near the dorsal-fin insertion (vs. lateral line to the end of the caudal peduncle) and 9½–10½ (vs.>10½) branched dorsal-fin rays. Paracanthocobitis zonalternans  is most similar morphologically to P. nigrolineata  but differs in having a series of black blotches, usually black stripe along the side of the body absent or dusky and ending near the dorsalfin insertion (vs. having a series of black blotches overlain by a black stripe ending near the caudal fin), and sometimes having 7 (vs. always 8) upper branched caudal-fin rays. Paracanthocobitis zonalternans  differs from P. phuketensis  in having black pigment extending from a black lateral stripe onto the pectoral-fin base, an axillary pelvic lobe (vs. lobe usually absent, occasionally rudimentary) and in having short (not extending ventrally to dorsal stripe) dorsal saddles in the majority of specimens that rarely connect to lateral blotches (vs. dorsal saddles longer than interspaces, frequently connecting to lateral blotches). Paracanthocobitis zonalternans  differs from P. triangula  in having a circular (vs. triangular  ) black spot on the upper margin of the caudal-fin base and in having black pigment extending from the black blotches along the side of the body onto the pectoral-fin base. Paracanthocobitis zonalternans  differs from P. marmorata  in having an axillary pelvic lobe and a circular (vs. teardrop shaped) black spot on the upper margin of the caudal-fin base and in not having a marmorated pattern between the dorsal saddles and lateral blotches.

Distribution. Paracanthocobitis zonalternans  is known from the Salween River drainage in Thailand and Myanmar ( Fig. 5View FIGURE 5).

Material Examined. Thailand: Salween drainage: CAS 35775View Materials, 6, 23.5–42.6 mm, Nam Mesarieng, near Mesarieng (Mae Sariang), northern Thailand , 18.151N, 97.934EGoogleMaps  ; CAS 35776View Materials, 2, 41.3–41.8 mm, same locality as CASAbout CAS 35775View MaterialsGoogleMaps  ; CAS 36042View Materials, 2, 38.8–40.8 mm, same locality as CASAbout CAS 35775View MaterialsGoogleMaps  ; FMNH 124763, 4, 19.6–27.7 mm, Nam Mae Yuan River, rte. 108, 103 km N of Mae Sariang , 18.807N, 97.931EGoogleMaps  ; FMNH 124764View Materials, 1View Materials, 29.1View Materials mm, Mae Samat River , rte. 108, 15 km S of Mae Hong Son  , 19.189N, 97.984E; NIFIAbout NIFI 0 0 874, 14, 28.0– 32.5 mm, Tak ProvinceGoogleMaps  , Huai Mae Kamui, Amphoe Tha Song Yang, 17.230N, 98.229E; NIFI 6393View Materials, 1View Materials, 35.7View Materials mm, Mae Hong Son ProvinceGoogleMaps  , Mae Sanga River , 18.238N, 97.961E; ROM 51139View Materials, 5, 23–31.9 mm, Tak ProvinceGoogleMaps  , N of Mae Charao, 16.967N, 98.567E; UF 188197View Materials, 7, 20.5–29.5 mm, Mae Hong Son ProvinceGoogleMaps  , Khun Yuam County, Pai River near Surin River, approx  . 1.5 km N of Ban Mae Surin on rte. 108, 18.928N, 97.937EGoogleMaps  ; UF 188198View Materials, 12, 23.3–35.7 mm, Tak Province, Amphoe Tha Song Yang, Moei River at rte. 105, approx. 7 km SE of Nam Tha Song Yang , 17.516N, 97.966EGoogleMaps  ; USNM 288452View Materials, 26View Materials (10 ex.) 33.5–42.4 mm, Mae Hong Son Province, mountain stream, 5 km W of Mae Sariang , 18.191N, 97.878EGoogleMaps  ; ZRC 41258View Materials, 8, 26.5–36.6 mm, Tak Province, Mae Nam Moi, S of Phop Phra, 16.290N, 98.706EGoogleMaps  ; ZSMAbout ZSM 27468View Materials, neotype of Cobitis zonalternans  , 33.1 mm, Huay Me Charno, 4 km S of Amphoe Mae Romat on road 1085. 

CAS

California Academy of Sciences

NIFI

National Inland Fisheries Institute

ZSM

Bavarian State Collection of Zoology

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Cypriniformes

Family

Nemacheilidae

Genus

Paracanthocobitis

Loc

Paracanthocobitis zonalternans ( Blyth, 1860 )

Page, Lawrence M. 2017

2017
Loc

Paracanthocobitis zonalternans

Singer 2015: 396

2015
Loc

Acanthocobitis (Paracanthocobitis) zonalternans

Grant 2007: 3

2007
Loc

Acanthocobitis zonalternans

Kottelat 1990: 13

1990
Loc

Noemacheilus zonalternans

Sen 1985: 119

1985
Loc

Nemachilus zonalternans

Day 1889: 232

1889
Loc

Cobitis zonalternans

Kottelat 1990: 42
Day 1872: 186
Day 1869: 551Blyth 1860: 172

1869
Loc

Nemacheilus zonalternans

Day 1869: 551

1869