Lamontichthys Miranda Ribeiro, 1939

Raphael Covain & Sonia Fisch-Muller, 2007, The genera of the Neotropical armored catfish subfamily Loricariinae (Siluriformes: Loricariidae): a practical key and synopsis., Zootaxa 1462, pp. 1-40 : 31

publication ID

z01462p001

publication LSID

lsid:zoobank.org:pub:D1F13841-BD7B-4D00-B57D-9CBEC187B83C

DOI

https://doi.org/10.5281/zenodo.6236657

persistent identifier

https://treatment.plazi.org/id/995066D5-F094-AD37-B5B8-C369F0E8B134

treatment provided by

Thomas

scientific name

Lamontichthys Miranda Ribeiro, 1939
status

 

Lamontichthys Miranda Ribeiro, 1939 View in CoL View at ENA   ZBK .

Type species: Harttia filamentosa La Monte, 1935   ZBK .

Holotype: AMNH 12616 , Brazil, Rio Jurua drainage, Rio Embira .

Gender: masculine.

Lamontichthys   ZBK is distributed in the northwestern part of South America in the upper Amazon and Orinoco River drainages, and in the Lake Maracaibo region. Species in this genus occupy the same ecological niche as those of Harttia   ZBK . They mainly live in the mainstream of rivers, on rocky and sandy bottoms (Taphorn & Lilyestrom 1984). Sexual dimorphism includes hypertrophied odontodes on the pectoral spines in mature males. Lamontichthys   ZBK is an open brooder. Eggs are laid on an open surface such as rocks, submerged wood or plants, and are generally exposed to the current. Females lay a few large-sized (1.4 to 1.8 mm in diameter) yellowish eggs during each spawning event (Taphorn & Lilyestrom 1984). These authors expressed doubts concerning the value of the character given by Isbrücker & Nijssen (1978) to diagnose Lamontichthys   ZBK (i. e. the number of pectoral fin rays i -7 versus i -6 for all other Loricariinae ). However, this feature is present in all species assigned to this genus, suggesting a common origin. Isbrücker & Nijssen (1976a) demonstrated that fin ray numbers, with few exceptions, were particularly conservative among members of Loricariinae . The phylogenetic position of Lamontichthys   ZBK remains uncertain. Rapp Py-Daniel (1997) considers it to be sister to Harttia   ZBK , whereas Lamontichthys   ZBK shows much more similarities with Pterosturisoma   ZBK , a monotypic genus which only differs from Lamontichthys   ZBK by the number of pectoral fin rays. Nevertheless, Rapp Py-Daniel (1997) tentavely placed Pterosturisoma   ZBK within Harttiina because of its similarity with Lamontichthys   ZBK , but did not provide any hypotheses on the phylogenetic relationships between these genera. Lamontichthys   ZBK includes four valid species, and a key to their identification is available in Taphorn & Lilyestrom (1984).

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