Cynopoecilus intimus, M., 2002

M., Wilson J. E., 2002, The annual fish genus Cynopoecilus (Cyprinodontiformes: Rivulidae): taxonomic revision, with descriptions of four new species, Ichthyol Explor. Freshwaters 13, No. 1, pp. 11-24 : 18-20

Cynopoecilus intimus , new species

(Fig- 4)

Holotype. MCP 20816 , 25.8 mm SL; Brazil: Rio Grande do Sul: temporary swamp close to a stream tributary to rio Vacacai, rio Jacut basin, road BR-392,6 km NW of Vila Block (about 29°55’S 53°50'W); W. JEM. Costa, D. Belote, R. D'Arrigo, 13 Sept 1997 .

Paratypes. MCP 20817 , 2 males, 23.9-25.5 mm SL, 6 females, 19.5-19.8 mm SL ; MZUSP 52911 , 1 male, 25.3 mm SL, 7 females, 19.1-20.6 mm SL ; UMMZ 234239 , 1 male, 28.1 mm SL, 9 females, 19.6-21.0 mm SL ; USNM 349455 , 1 male, 25.3 mm SL, 5 females, 18.2-20.2 mm SL ; NRM 42501 , 1 male, 26.1 mm SL, 5 females, 19.2-19.9 mm SL ; UFRJ 4489 , 4 males, 24.9-26.6 mm SL, 9 females, 18.8-21.6 mm SL ; UFRJ 4490 , 4 males, 25.9- 28.8 mm SL, 2 females 20.7 and 23.1 mm SL (c&s); collected with holotype .

Diagnosis. Differs from all its congeners and species of closely related genera ( Campellolebias , Leptolebias ) by' the smaller pelvic fin, its tip reaching anus, and its length 4.7-5.6 % SL in male and 4.1 -5.3 in female (vs. tip reaching urogenital bulb, length 5.6-8.3 in male, 5.6-7.4 in female in other 'species of Cynopoecilus , or reaching anal-fin base in other genera), and dorsum of male below dorsal fin with rounded blotches (vs. small irregular marks or no marks). It is also distinguished from all other species of the genus by the combination of the following characters: the whole caudal fin of male with dark botches (vs. faint spots restrict ­ ed to the dorsal portion of the fin or caudal spots absent in C. melanotaenia ), pectoral-fin length of male 19.1 -22.2 % SL (vs. 16.1-18.5 in C. fulgens ), longitudinal rows of spots on body of male pale golden to greenish golden anteriorly and light blue posteriorly (vs. all spots bright golden in C. fulgens ), dorsal profile of head of adult male slightly concave (vs. strongly concave in C. nigrovittatus ), lateral body stripes of male dark reddish brown (vs. black in C. nigrovittatus ), caudal fin of male without a bright blue zone along posterior margin of the fin (vs. present in C. nigrovittatus ), 11-13 supraorbital neuromasts (vs. 17-20 C. multipapillatus ), and one to three neuromasts per scale of the lateral line (vs. five to nine in C. multipapillatus )

Description. Morphometric data are given in Table 4 . Body slender, slightly compressed, body width approximately 1.5 in body depth in larger males. Longest body depth on a vertical through pelvic-fin base. Dorsal profile nearly straight to slightly concave on head, convex between nape and posterior end of dorsal-fin base, approximately straight on caudal peduncle; ventral ofile between lower jaw and end of anal-fin base smoothly convex to approximately straight in male, convex in female, and approximately straight on caudal peduncle of both sexes.

Tip of dorsal and anal fins pointed and long in male, rounded and short in female. Caudal fin rounded to subtruncate. Pectoral fin elliptical. Posterior margin of pectoral fin just posterior to a vertical through pelvic-fin base in male, and just anterior to that vertical in female. Tip of pelvic fin slightly posterior to anus. Pelvic fins medially separated by a small interspace. Dorsal-fin origin in a vertical through genital bulb in male, and through anus in female. Anal-fin origin in a vertical through base of 2nd or 3rd dorsal-fin ray in male, and base of 4th or 5th in female. Dorsal-fin rays 17-18; anal-fin rays 23-25; caudal-fin rays 26-29; pectoral-fin rays 13-14; pelvic-fin rays 5-6. Longitudinal series of scales 25-26, transverse series of scales 8-9, and scale rows around caudal peduncle 12. Ctenii-like contact organs on caudal peduncle side of male. No contact organs on pectoral-fin of male. Supraorbital neuromasts 11-13. One to three neuromasts per scale of lateral line. Gill-rakers on first branchial arch 2 + 9. Total vertebrae 28-29.

Coloration. Male; side of body light yellowish brown; a broad, dark reddish brown horizontal stripe on midline of body and head, between lower jaw and caudal-fin base; on body side and opercular region stripe overlapped by longitudinal series of spots, pale golden anteriorly and light blue posteriorly, each spot on center of each scale; a narrower reddish brown stripe, slightly lighter and ventral to median stripe, between pectoral-fin base and end of anal-fin base, anteriorly overlapped by small pale golden spots; a dorsolateral row of rounded brown blotches below dorsal fin. Dorsum light brown with small rounded dark reddish brown spots. Venter white. Suborbital bar dark reddish brown, usually posteriorly followed by similar, lighter marks. Iris yellow, with a vertical dark brownish red bar; dark reddish brown pigment concentrated on posterior portion of iris. Unpaired fins greenish hyaline; rounded dark brown blotches on dorsal and caudal fins; faint gray spots on posterobasal portion of anal fin. Pectoral fin hyaline. Pelvic fin brownish gray.

Female: color pattern as in male, but lateral longitudinal stripes pale brown, not overlapped by longitudinal rows of bright spots.

Distribution. Upper rio Jacui basin, rio Vacacai drainage, southern Brazil ( Fig. 1 ).

Etymology. From the Latin intimus (very inside), a reference to the type locality distantly situated from the sea, contrasting with the coastal distributton of all other members of the Cynopoeciliidi. An adjective.

Figures

Fig. 1. Geographic distribution of Cynopoecilus: C. melanotaenia (*), C.fulgens (■), C. infimus (*), C. nigrovittatus (♦), and C multipapillatus (*}. Arrows indicate type localities; symbols may represent more than one locality. Scale bar 70 km.

Tables

Table 4. Morphometric data for holotype (H) and nine paratypes of Cynopoecilus intimus.

		males				females
	H	paratypes
	MCP 20816	UFRJ 4489	UFRJ 4489	UFRJ 4489	UFRJ 4489	UFRJ 4489	UFRJ 4489	UFRJ 4489	UFRJ 4489	UFRJ 4489
SL [mm]	25.8	26.6	26.0	25.6	24.9	21.6	21.5	20.1	20.1	20.0
In percents of standard length
Body depth	28.7	28.0	27.3	27.9	28.2	26.0	27.5	28.1	29.1	28.4
Caudal peduncle depth	14.2	13.1	14.0	13.7	14.4	13.6	14.4	13.6	14.1	13.5
Predorsal length	57.1	57.7	56.0	58.7	57.7	60.5	62.1	63.7	62.2	63.4
Prepelvic length	49.9	48.9	51.5	51.5	52.2	53.4	53.9	56.2	55.8	58.2
Length of dorsal-fin base	32.2	30.5	29.7	29.7	30.5	25.5	24.4	24.0	26.4	25.0
Length of anal-fin base	26.7	25.5	24.0	25.4	25.9	20.7	21.9	20.3	22.1	20.6
Caudal-fin length	32.7	28.8	32.6	31.1	32.0	28.9	36.0	34.6	34.1	31.1
Pectoral-fin length	21.7	20.7	20.9	19.1	22.2	18.8	20.0	19.4	19.1	19.5
Pelvic-fin length	5.0	5.5	5.0	5.6	4.7	4.1	5.1	4.4	5.3	5.2
Head length	30.9	30.7	28.6	29.6	30.1	27.4	29.8	29.4	30.0	29.9
In percents of head length
Head depth	67.8	66.5	69.4	69.5	70.6	78.5	72.7	75.2	77.3	74.9
Head width	67.3	66.7	69.3	66.6	69.1	76.2	69.5	74.5	75.0	70.9
Snout length	13.1	13.1	12.9	14.0	14.6	14.7	13.8	14.2	13.9	11.7
Lower jaw length	26.1	27.8	25.2	26.1	28.5	23.8	22.5	21.8	23.1	22.2
Eye diameter	32.9	32.2	36.9	35.2	36.1	36.5	35.8	37.3	35.2	36.8