J. J. Hoedeman’s scientific contributions

... The exclusive features observed in Corydoradinae are: (1) distal area of nasal organ lamellae detached from the nasal chamber floor; (2) telencephalon with straight edges and roughly rectangular; (3) increased size of the tectum mesencephali; (4) corpus cerebelli posterior to the tectum mesencephali; (5) decreased size of the corpus cerebelli; (6) lobus facialis ventral to corpus cerebelli; (7) lateral portion of lobus facialis angular, dorsal to the lobus vestibulolateralis; and (8) anterior margin of the lobus vagus above the posterior portion of the lobus facialis. The distributions of these character states support the groups originally proposed by Hoedeman (1952), which were supported by the morphology-based phylogenies proposed by Reis (1998) and Britto (2003) and the molecularbased phylogeny proposed by Shimabukuro-Dias et al. (2004) and Alexandrou et al. (2011). ...

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Comparative gross encephalon morphology in Callichthyidae (Teleostei: Ostariophysi: Siluriformes)

... Numbers of vertebrae were recorded only from cleared and stained (C&S) specimens, prepared according to Taylor and Van Dyke (1985). Frontal squamation nomenclature follows that described by Hoedeman (1958), and that of cephalic neuromast series follows Costa (2001). ...

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A new species of Melanorivulus (Cyprinodontiformes: Rivulidae) from headwaters of the Taquari River basin, Paraguay River basin, central Brazilian Cerrado

... The counts of fin-rays and vertebrae, taken from cleared and stained samples (c&s) prepared according to Taylor & van Dyke (1985) for bone only. Head scalation terminology follows Hoedeman (1959). Cephalic neuromast abbreviation follows Costa (2001). ...

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Rivulus foliiscola, (Cyprinodontiformes, Rivulidae,) a new species in the genus Rivulus, subgenus Owiyeye from the Alto Rio Negro, Guainía Department, South-Eastern Colombia

... Features of morphology and implantation patterning of jaw teeth have long been recognized as taxonomically and ontogenetically important features within Alestidae (Hoedeman, 1951;Poll, 1967;Paugy, 1986;Murray and Stewart, 2002;Murray, 2004;Zanata and Vari, 2005;Paugy and Schaefer, 2007). With the exceptions of Hydrocynus, Lepidarchus, and Clupeocharax where both upper and lower jaw teeth are unicuspid and arrayed in single rows, most alestids have pluricuspid teeth with two (or three in the case of Bryconaethiops) rows on each premaxilla, and one on each dentary (numerous taxa also have an inner row pair of conical teeth located either side of the dental symphysis). ...

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Systematic Review and Cranial Osteology of Petersius with Redescription of P. conserialis (Teleostei: Alestidae) from the Rufiji and Ruvu Rivers of Tanzania

... The species has an exoskeleton comprised of armored, ganoid scales with a microstructure characteristic of ancient palaeoniscoid fish [63][64]. Dermal fish armor first appeared in Ostracoderms in the Paleozoic era approximately 500 million years ago [65] in response to predatory threats [66][67]with multilayered structures and geometries [68][69]. The large, heavy dermal armor plates broke into several smaller plates during the Devonian period (approximately 400 million years ago) as fish became predators and required faster swimming agility with light-weight armor and greater flexibility [66, 70]. ...

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Biological and bio-inspired morphometry as a route to tunable and enhanced materials design

... Single hypaxial electric organ, extending along entire ventral margin of body with 3-4 rows of electroplates near caudal insertion of anal fin. Gymnotus (Gymnotus) chimarrao can be differentiated from all other members of the subgenus on the basis of the following characters: color pattern with singly-occurring dark pigment bands in juveniles (29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45) and faint or absent bands in mature specimens (vs. paired bands, rounded spots or irregularly-shaped blotches in all other Gymnotus). ...

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Phylogenetic revision of Gymnotidae (Teleostei: Gymnotiformes), with descriptions of six subgenera