A new species of Sturisoma (Loricariidae: Loricariinae) from the Madre de Dios River basin, Peru, with a key to all congeners and comments on the type series of Sturisoma rostratum
A. Londoño-Burbano
Abstract
A new species of the genus
Sturisoma from the Madre de Dios River, upper Madeira, Peru, is described. The new species can be differentiated from its congeners by the following characteristics: dorsolateral stripe reaching to less than half, or only half length of caudal peduncle (
v. absence of dorsolateral stripe or, if present, spanning more than half caudal-peduncle length); premaxillary teeth longer than dentary teeth (
v. dentary teeth longer); sexually mature adult males having well-developed odontodes on the sides of the head and a broader snout (
v. adult males lacking well-developed hypertrophied odontodes or, if present, rostrum is same width as females' or immature males'); by having the ventral portion of the rostrum conspicuously darker than ventral surface of the body (
v. rostrum light, with same colour as ventral portion of body, except in
Sturisoma barbatum); by lacking the lateral process of the sphenotic (
v. lateral process of sphenotic well-developed, except in
Sturisoma tenuirostre); a dark spot on the first three branched pectoral-fin rays (
v. brown spot absent, except in
S. barbatum); and the frontal bone contributing less than half of dorsal border of the orbital ridge (
v. extensive participation of the frontal, except in
Sturisoma guentheri). Furthermore, the new species has 18–20 plates in the median series, which differentiates it from
Sturisoma rostratum (21–22), and
Sturisoma monopelte (21); and 14–15 coalescent plates, which differentiates it from
S. tenuirostre (16–17). It is further differentiated from
Sturisoma brevirostre by presence of an enlarged rostrum (
v. rostrum not enlarged). A discussion regarding status of the type series and geographic distribution of
Sturisoma rostratum is offered, and an identification key for all
Sturisoma species is presented.
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Die neue Art heisst
Sturisoma graffini.
Das Paper ist leider zugngsbeschränkt.
Link zum Abstract.
Sobald ich's mir durchgelesen habe, kommt die Art auch in die DB.
Gruß,
Karsten