Fig. 1
Hyphessobrycon compressus , holotype, FMNH 4641, 31.2 mm SL, male, río Papaloapan, Oaxaca, Mexico. (c) FMNH Division of Fishes.
Fig. 2
Hyphessobrycon compressus, paratypes: (a) BMNH 1905.12.6.4-5, male, 31.5 mm SL; (b) MHNG 2181.076, male, 29.2 mm SL; (c) USNM 204387, male, 31.3 mm SL. Photos by James Maclaine (BMNH), Phillipe Wagneur (MHNG), and Sandra Raredon (USNM).
Fig. 3
Hyphessobrycon compressus , UFRGS 9683, female, 32.2 mm SL, right lateral view of (a) maxilla, (b) premaxilla, and (c) dentary. AAR = anguloarticular; DEN = dentary; MAX = maxilla; PMX = premaxilla; RAR = retroarticular. Scale bars of (a, c) = 0.5 mm and (b) = 0.2 mm.
Fig. 4
Hyphessobrycon compressus , UFRGS 9683, female, 30.9 mm SL, ventrolateral view of premaxillary teeth in left premaxilla. (a) inner and outer row of premaxillary teeth, (b) detail of tooth form and alignment. Scale bars of (a) = 0.2 mm and (b) = 0.1 mm.
Fig. 5
Hyphessobrycon compressus just after collection, not preserved, left view: (a) nuptial male individual displaying darker color pattern, collected in drainage of río Coatzacoalcos basin, Veracruz Province, Mexico; (b) female from río Usumacinta basin, Chiapas Province, southern Mexico. (c) female from river near Teapa, Tabasco, Mexico. Background of images were edited and differences in fins color are due to back ground color of original images, normally made on hand. (c) Photos (a-b) by Marco Endruweit and (c) by Michael Tobler.
Fig. 6
Hyphessobrycon compressus , UFRGS 9683, male, 31.2 mm SL, anal fin and detail of bony hooks, left lateral view. DRA = distal radial; MRA = medial radial, and PRA = proximal radial. Scale bar = 1 mm.
Fig. 7
Geographic distribution of Hyphessobrycon compressus . Green light square represent approximate locality of Hemigrammus compressus holotype and dark green triangle represent approximate locality of Hyphessobrycon compressus milleri holotype. Some symbols can represent more than one lot or locality. 1) Mexico, 2) Belize, 3) Guatemala, 4) Nicaragua, and 5) El Salvador.
Fig. 8
Hyphessobrycon compressus milleri , holotype, CAS 70115, 31.3 mm SL, male, Los Amates, Guatemala. Views (a) left lateral, (b) dorsal, (c) ventral, and (d) radiograph of holotype. Photos by (c) California Academy of Sciences.
Fig. 9
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, neurocranium in dorsal view, anterior to left. EPO = epioccipital; EXO = exoccipital; FRF = frontal fontanel; FRO = frontal; LET = lateral ethmoid; MES = mesethmoid; NAS = nasal; PAR = parietal; PTF = posttemporal fossa; PTO = pterotic; SOC = supraoccipital; SPH = sphenotic. Scale bar = 1 mm.
Fig. 10
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, neurocranium in left lateral view, anterior to left. AUF = auditory foramen; BOC = basioccipital; EPO = epioccipital; EXO = exoccipital; FRO = frontal; LET = lateral ethmoid; MES = mesethmoid; OSP = orbitosphenoid; PAR = parietal; PRO = prootic; PSP = parasphenoid; PTF = posttemporal fossa; PTO = pterotic; PTS = pterosphenoid; RSP = rhinosphenoid; SOC = supraoccipital; SPH = sphenotic; VOM = vomer. Scale bar = 1 mm.
Fig. 11
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, neurocranium in ventral view, anterior to left. BOC = basioccipital; EXO = exoccipital; FRO = frontal; INC = intercalar; LET = lateral ethmoid; MES = mesethmoid; OSP = orbitosphenoid; PRO = prootic; PSP = parasphenoid; PTO = pterotic; PTS = pterosphenoid; SPH = sphenotic; VOM = vomer. Scale bar = 1 mm.
Fig. 12
Hyphessobrycon compressus , UFRGS 9683, 30.7 mm SL, female, asteriscus otolith, (a) left, ventral view and (b) right, dorsal view. Scale bar = 0.5 mm.
Fig. 13
Hyphessobrycon compressus , UFRGS 9683, 31.1 mm SL, female, antorbital and infraorbital series, left lateral view, anterior to left. AOR = antorbital; IO (1 to 6) = infraorbitals. Scale bar = 1 mm.
Fig. 14
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, suspensorium in left lateral view, anterior to left. APL = autopalatine; ECP = ectopterygoid; HYO = hyomandibula; IHY = interhyal; IOP = interopercle; OPE = opercle; POP = preopercle; QUA = quadrate; SOP = subopercle; SYM = symplectic; MSP = mesopterygoid; MTP = metapterygoid. Scale bar = 1 mm.
Fig. 15
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, (a) left hyoid skeleton in dorsal view, and (b) left lateral and dorsal views of urohyal. ACH = anterior ceratohyal; BRR = branchiostegal ray; DHY = dorsal hypohyal; IHY = interhyal; PCH = posterior ceratohyal; URY = urohyal; VHY = ventral hypohyal. Scale bar = 1 mm.
Fig. 16
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, (a) branchial skeleton in dorsal view, and (b) detail of second branchial raker of epibranchial 1. BB1-4 = basibranchials 1-4; BHY = basihyal; CBR = ceratobranchial (1-5); EBR = epibranchials (1-4); HBR = hypobranchials; PBR = pharyngobranchials (1-4). Scale bar = 1 mm.
Fig. 17
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, Weberian apparatus in left lateral view, anterior to left. CLT = claustrum; ITL = intercalarium; NAR = neural arch; NCO = neural complex of Weberian apparatus; NSP = neural spine of fourth and fifth vertebrae; PRB = pleural rib; SCP = scaphium; TP3 = transverse process of third vertebra; TRP = tripus; VCN = vertebral centrum. Scale bar = 1 mm.
Fig. 18
Hyphessobrycon compressus , UFRGS 9683, 31.1 mm SL, female, posterior precaudal and anterior caudal vertebrae in left lateral view, (a) precaudal vertebrae and (b) caudal vertebrae.; EPN = epineural; EPP = epipleural; HPZ = haemal postzygapophysis; HSP = haemal spine; NPZ = neural postzygapophysis; NSP = neural spine; PRB = pleural rib; VCN = vertebral centrum. Scale bar = 1 mm.
Fig. 19
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, pectoral girdle in (a) medial view, anterior to right, and (b) lateral view, anterior to left. CLE = cleithrum; COR = coracoid; EXP = extrascapular; MCO = mesocoracoid; PC1 = postcleithrum 1; PC2 = postcleithrum 2; PC3 = postcleithrum 3; SCA = scapulum; SCL = supracleithrum; PRA = proximal radial; PTR = pectoral-fin rays; PTT = posttemporal. Scale bar = 1 mm.
Fig. 20
Hyphessobrycon compressus, UFRGS 9683, 31.1 mm SL, female, pelvic girdle in (a) ventral view of right pelvic fin and (b) dorsal view of left pelvic fin, anterior to left. ISP = ischiatic process; PVB = pelvic bone; PVR = pelvic-fin rays. Scale bar = 1 mm.
Fig. 21
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, dorsal fin in left lateral view. DOR = dorsal-fin rays; DRA = distal radial; MRA = medial radial; PRA = proximal radial. Scale bar = 1 mm.
Fig. 22
Hyphessobrycon compressus , UFRGS 9683, 31.2 mm SL, male, caudal skeleton in left lateral view. EPU = epurals; CRA = caudal-fin rays; DPR = dorsal procurrent caudal-fin rays; HSP = haemal spine; HYP = hypurals; NSP = neural spine; PAP = parhypural; SNP = specialized neural process; URN = uroneural; URT = urostyle; VPR = ventral procurrent caudal-fin rays. Scale bar = 1 mm.
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