Osteobrama tikarpadaensis, Shangningam & Rath & Tudu & Kosygin, 2020

Shangningam, Bungdon, Rath, Shibananda, Tudu, Asha Kiran & Kosygin, Laishram, 2020, A new species of Osteobrama (Teleostei: Cyprinidae) from the Mahanadi River, India with a note on the validity of O. dayi, Zootaxa 4722 (1), pp. 68-76 : 68-76

Osteobrama tikarpadaensis , new species

( Figure 1 )

Holotype. ZSI FF 7494, 129.0 mm SL; India: Odisha, Angul District, Mahanadi River at Marada , 3 km from Tikarpada , 20°35ʹN 84°47ʹE, L. Kosygin Singh, 8 June 2016.

Paratypes. ZSI FF 7495, 5, 90.3–129.0 mm SL, same data as holotype.

Diagnosis. Osteobrama tikarpadaensis , new species, can be distinguished from its congeners by the combination of the following characters: two pairs of minute barbels; dorsal fin with iii–iv simple and 8 branched rays, last unbranched ray stiff, serrated, with 25–33 serrae; pectoral fin with 15–16 branched rays; anal fin long, with 25–27 branched rays; predorsal scales 29–32, lateral line complete, with 59–71 scales; and an oblique black streak on anterior body immediately posterior to opercle, parallel to upper opercular margin.

Description. Morphometric data are presented in Table 1 . Body deep, laterally compressed. Dorsal profile sloping upward linearly to nape, then in a broad curve to dorsal-fin origin, forming a distinct hump, then sloping gradually downward towards caudal peduncle. Ventral profile strongly curved from tip of snout to origin of anal fin. Head compressed, longer than deep. Eyes large, slightly bulging, situated anteriorly on head, visible from dorsal and ventral sides. Interorbital space slightly arched. Mouth terminal, obliquely directed upwards. Gape of mouth almost reaching anterior margin of orbit. Barbels in two pairs (rostral and maxillary), minute ( Fig. 2 ). Nostrils almost at level of upper margin of eye, distinctly nearer to anterior margin of eye than to tip of snout.

Dorsal fin with iii (2) or iv (4) unbranched and 8 (6) branched rays, its base with 9 (1), 10 (3), 11(1) or 12(1) scales, slightly closer to tip of snout than to caudal-fin base; last unbranched ray stiff, serrated with 25 (2), 26 (1), 27 (1), 29 (1) or 33 (1) serrae; tip of first branched ray, when adpressed, nearly reaching level of posterior end of anal fin. Pectoral fin with 1 unbranched and 15(4)–16(2) branched rays, shorter than head length; first branched ray longest, extending past pelvic-fin base. Pelvic fin with 1 (6) unbranched and 9 (6) branched rays, closer to pectoral-fin origin than to anal-fin origin, shorter than head length; pelvic fin extending past anus, reaching one scale anterior to anal-fin origin when adpressed. Anal fin long, with iii (6) unbranched and 25 (2), 26 (3) or 27 (1) branched rays, its base with 23 (1), 26 (1), 27 (3) or 28 (1) scales, almost reaching caudal peduncle when adpressed. Anus located immediately anterior to anal-fin origin. Caudal fin deeply forked, with 9+8 branched rays.

.

Scales small. Circumpeduncular scales 26 (1), 27 (4) or 28 (1). Pre-dorsal scales 29 (1), 30 (1), 31 (3) or 32 (1). Pre-anal scales 33 (1), 36 (2), 37 (2) or 38 (1). Lateral transverse scale rows between dorsal-fin origin to lateral line 14 (2) or 15 (4); and transverse scale rows between lateral-line to pelvic fin 13 (1) or 14 (5). Lateral line complete with 59 (1), 60 (1), 64 (2) or 71 (2) scales. Total vertebrae 36–37, comprised of 18 (1) or 19 (1) abdominal and 18 (2) caudal vertebrae ( Fig. 3 ).

Coloration. In preserved specimens, dorsal and dorsolateral surfaces of head and body faint brown, lateral surfaces of body below lateral line greyish become lighter ventrally. Dorsal, pectoral and caudal fins light greyish. Pelvic and anal fins pale white. Upper margin of eye black; an oblique black streak on anterior body immediately posterior to opercle, parallel to upper opercular margin.

Etymology. The species is named after its type locality, Tikarpada, Odisha State, India.

Distribution. Osteobrama tikarpadaensis is presently known only from the type locality Mahanadi River at Marada, 3 km from Tikarpada, Odisha state, India ( Figs. 4–5 ).

Figures

FIGURE 1. Osteobrama tikarpadaensis, holotype, ZSI FF 7494, 129 mm SL; India; Angul District; Mahanadi River at Marada, 3 km from Tikarpada.

FIGURE 2. Osteobrama tikarpadaensis, holotype, ZSI FF 7494, 129 mm SL, laterally inverted, showing presence of barbels (RB, rostral barbel; MB, maxillary barbel).

FIGURE 3. Radiograph of Osteobrama tikarpadaensis, paratype, ZSI FF 7495, 119 mm SL.

FIGURE 4. Map of Odisha, indicating the type locality of Osteobrama tikarpadaensis.

FIGURE 5. Mahanadi River, type locality of Osteobrama tikarpadaensis.

Tables

TABLE 1. Morphometric data of holotype and 5 paratypes of Osteobrama tikarpadaensis. Ranges include values of holotype (N = 6). SD, standard deviation

	Holotype	Range	Mean	SD
	ZSI FF 7494
Standard Length (mm)	129	90.3–129
In % of Standard length
Body depth	39.5	34.5–39.5	36.3	1.8
Head length	25.7	24.5–28.8	26.0	1.8
Head depth	18.6	16.4–18.6	17.6	0.9
Snout length	8.0	7.1–8.3	7.6	0.5
Eye diameter	6.7	6.7–8.3	7.3	0.6
Inter-orbital width	10.0	8.7–10.0	9.3	0.5
Head width	14.2	13.2–14.4	13.7	0.5
Mouth width	5.7	5.6–7.1	6.4	0.6
Inter-narial space	6.0	5.0–6.0	5.4	0.3
Body width at anal-fin origin	10.4	9.3–11.7	9.9	0.9
Body width at dorsal-fin origin	12.0	10.6–12.0	11.4	0.6
Caudal-peduncle length	14.8	14.5–15.6	14.9	0.4
Caudal-peduncle depth	11.8	10.3–12.2	11.2	0.7
Dorsal-fin base length	13.0	13.0–14.2	13.6	0.5
Dorsal-fin length	29.4	24.6–29.4	27.6	1.8
Pectoral-fin length	20.6	19.2–21.2	20.5	0.7
Pelvic-fin length	18.2	17.6–18.9	18.4	0.5
Anal-fin base length	31.2	29.5–32.0	30.9	0.9
Anal-fin length	31.1	29.7–31.7	30.7	0.8
Caudal-fin length	29.8	29.2–33.4	31.5	1.7
Median caudal-fin length	9.1	8.0–10.5	9.1	0.9
Pre-dorsal length	38.1	37.8–40.4	39.3	1.1
Pre-pectoral length	26.3	24.7–26.6	25.7	0.8
Pre-pelvic length	42.2	39.9–43.1	41.8	1.2
Pre-anal length	60.8	60.0–61.7	60.6	0.8
Pelvic-anal distance	19.7	19.7–21.3	20.4	0.6
Meristic Counts
Dorsal-fin rays	iii, 8	iii–iv, 8
Pectoral-fin rays	i, 15	i, 15–16
Pelvic-fin rays	i,9	i, 9
Anal-fin rays	iii, 26	iii, 25–27
Lateral-line scales	71	59–71
Pre-dorsal scales	32	29–32
Pre-anal scales	37	33–38
Transverse-scale rows	15/1/14	14–15/1/13 ̶14
No. of serrae on last unbranched dorsal-fin ray	27	23–27
Circumpeduncular scales	28	26–28