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Simplification of a species complex: Two new species of Leucothoidae (Crustacea: Amphipoda) previously attributed to Leucothoe spinicarpa (Abildgaard, 1789) in Florida, U.S.A.
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Abstract
Leucothoe spinicarpa (Abildgaard, 1789) has long been thought of as a cosmopolitan species; however, relatively recent morphological studies have discovered a species complex previously attributed to L. spinicarpa. Despite this, several species remain hardly distinguishable from the general leucothoid form of L. spinicarpa. Morphological analyses reveal two distinct species in Tampa Bay, Florida, USA, which is supported by molecular mitochondrial COI and nuclear 18S ribosomal DNA data. Leucothoe tunicasp. nov. and L. machidaisp. nov. are described herein. Analyses of DNA sequences from specimens from Tampa Bay, FL, Big Pine Key, FL, and Belize of L. tunicasp. nov. demonstrate intraspecific genetic structure in morphologically identical populations. Therefore, the geographically distant populations of L. tunicasp. nov. thus represent one species with a wide distribution, whereas L. machidaisp. nov. has so far been collected only in Tampa Bay.
Title: Simplification of a species complex: Two new species of Leucothoidae (Crustacea: Amphipoda) previously attributed to Leucothoe spinicarpa (Abildgaard, 1789) in Florida, U.S.A.
Description:
Abstract
Leucothoe spinicarpa (Abildgaard, 1789) has long been thought of as a cosmopolitan species; however, relatively recent morphological studies have discovered a species complex previously attributed to L.
spinicarpa.
Despite this, several species remain hardly distinguishable from the general leucothoid form of L.
spinicarpa.
Morphological analyses reveal two distinct species in Tampa Bay, Florida, USA, which is supported by molecular mitochondrial COI and nuclear 18S ribosomal DNA data.
Leucothoe tunicasp.
nov.
and L.
machidaisp.
nov.
are described herein.
Analyses of DNA sequences from specimens from Tampa Bay, FL, Big Pine Key, FL, and Belize of L.
tunicasp.
nov.
demonstrate intraspecific genetic structure in morphologically identical populations.
Therefore, the geographically distant populations of L.
tunicasp.
nov.
thus represent one species with a wide distribution, whereas L.
machidaisp.
nov.
has so far been collected only in Tampa Bay.
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