New Sturisoma
Posted: 20 Oct 2022, 01:19
Londoño-Burbano, A & MR Britto, 2022. A new species of Sturisoma Swainson, 1838 (Loricariidae: Loricariinae) from the Madeira River basin, with a discussion of historical biogeography of western Amazonas and Paraguay River basins. Journal of Fish Biology doi:10.1111/jfb.15251.
Abstract
A new loricariin species of Sturisoma is described from the Cautário, Guaporé, Mamoré, Machado and Soteiro rivers, Madeira River basin, in Bolivia and Brazil. The new species is distinguished from its congeners by the presence of a middorsal longitudinal, thin dark brown stripe on caudal peduncle, extending from two or three plates posterior to dorsal-fin base, reaching origin of caudal fin, or one or two plates anterior to origin of caudal fin; small squarish anteriormost abdominal plates; and a middorsal longitudinal dark brown stripe from first pre-dorsal plate, to near the dorsal-fin origin. Furthermore, the new species is diagnosed from congeners by plate morphology, counts on the median series, coalescent plates, and ventrolateral thoracic plates, in addition to measurements related to body and head structures. An analysis of genetic distances using COI marker of the mitochondrial genome between the new species and several congeners is presented; in addition to a likelihood analysis to illustrate the position of the new taxon within Sturisoma. An identification key for species of the genus currently recorded at the upper Amazonas River basin is offered.
Abstract
A new loricariin species of Sturisoma is described from the Cautário, Guaporé, Mamoré, Machado and Soteiro rivers, Madeira River basin, in Bolivia and Brazil. The new species is distinguished from its congeners by the presence of a middorsal longitudinal, thin dark brown stripe on caudal peduncle, extending from two or three plates posterior to dorsal-fin base, reaching origin of caudal fin, or one or two plates anterior to origin of caudal fin; small squarish anteriormost abdominal plates; and a middorsal longitudinal dark brown stripe from first pre-dorsal plate, to near the dorsal-fin origin. Furthermore, the new species is diagnosed from congeners by plate morphology, counts on the median series, coalescent plates, and ventrolateral thoracic plates, in addition to measurements related to body and head structures. An analysis of genetic distances using COI marker of the mitochondrial genome between the new species and several congeners is presented; in addition to a likelihood analysis to illustrate the position of the new taxon within Sturisoma. An identification key for species of the genus currently recorded at the upper Amazonas River basin is offered.
