Compsaraia iara
Compsaraia iara Bernt & Albert, 2017
First described in: Bernt, M. J.; Albert, J. S. (2017). A New Species of Deep-channel Electric Knifefish Compsaraia(Apteronotidae, Gymnotiformes) from the Amazon River. <em>Copeia.</em> 105(2): 211-219.
Descriptions from checklists and floras indexed by GBIF
biology_ecology
Ecology. — Specimens of C. iara examined in this study were collected from white waters at depths ranging from two to 30 meters. Gut contents of several specimens collected in the Amazon River near the mouth of the Rio Xingu were exclusively composed of dipteran (Ceratopogonidae) larvae mixed with very fine sand, suggesting this species is a benthic forager. No secondary sexual dimorphism has been observed in this species, although the closely related C. samueli is known to have pronounced sexual dimorphism of the snout and jaws (Albert and Crampton, 2009). Considering that mature male specimens of C. samueli are rarely captured using conventional sampling methods, a more extensive examination of the gonads of C. iara or collection of reproductive specimens during high water will be needed to confirm the absence of dimorphism.
A New Species of Deep-channel Electric Knifefish Compsaraia (Apteronotidae, Gymnotiformes) from the Amazon River
description
Description. — Body elongate and laterally compressed (Figs. 1, 3). Morphometric and meristic data summarized in Table 1. Largest recorded size 235 mm TL. Body strongly compressed laterally. Scales absent from nape (above lateral line to about fifth lateral-line pore) and along entire dorsal midline. Scales ovoid, oriented in 6 – 8 rows above lateral line at midbody. Eyes small and subdermal. Head short, dorsal profile convex, snout rounded. Mouth small and subterminal. Gape extending to vertical with posterior nares. Ventrally rounded lips covering most of lower jaw. Electroreceptive dorsal organ originating at about midbody. Nasal capsule elongate. Posterior nares about equidistant from eye and anterior nares. Premaxillae crescent-shaped in ventral view and lacking teeth (Fig. 4 B). Maxillae with anteroventral shelf and anterior hook. Descending blade evenly tapered with slight dorsal curve. Mesethmoid strongly decurved (Fig. 4 A). Ventral ethmoid robust with short, posteriorly angled lateral processes contacting lateral ethmoid cartilage. Width of lateral process at base roughly equal to width at distal end. Lateral ethmoid robust in adults with dorsal articulating surface expan
A New Species of Deep-channel Electric Knifefish Compsaraia (Apteronotidae, Gymnotiformes) from the Amazon River
description
urn: lsid: zoobank. org: act: 089 E 738 D- 0 D 2 D- 4 C 35 - B 3 B 2 - 6518 CB 675 C 26 Figures 1, 3, 4, 5 B; Table 1
A New Species of Deep-channel Electric Knifefish Compsaraia (Apteronotidae, Gymnotiformes) from the Amazon River
diagnosis
Diagnosis. — Compsaraia iara can be unambiguously distinguished from all congeners by the following characters: forehead strongly rounded with dorsal margin of frontals and parasphenoid convex (vs. straight or concave in adult C. compsa and C. samueli; Figs. 2, 3 A, 5 A). Mouth small, gape not reaching vertical with eye in adults (Fig. 3 C), vs. reaching or exceeding vertical with eye in adult C. compsa and C. samueli. Teeth absent from premaxilla, vs. 8 – 16 teeth on the premaxilla in C. compsa and 4 – 10 in C. samueli.
A New Species of Deep-channel Electric Knifefish Compsaraia (Apteronotidae, Gymnotiformes) from the Amazon River
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Every page naming Compsaraia iara in the Biodiversity Heritage Library →
From the GBIF Backbone Taxonomy and occurrence records (GBIF.org), with Wikipedia and the Source Library. GBIF species 9464257.