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- Title
Hidden diversity and cryptic speciation refute cosmopolitan distribution in Caprella penantis ( Crustacea: Amphipoda: Caprellidae).
- Authors
Pilar Cabezas, María; Cabezas, Patricia; Machordom, Annie; Guerra‐García, José M.
- Abstract
Caprella penantis is considered a cosmopolitan species and one of the most challenging caprellids in taxonomic terms because of its remarkable intraspecific morphological variation. This study examined DNA sequences from mitochondrial ( COI) and nuclear ( 18 S) markers together with morphological data from 25 localities of C. penantis, and closely related species Caprella dilatata and Caprella andreae, all traditionally considered part of the old ' acutifrons' complex. The large genetic divergence and reciprocally allopatric distributions point to the existence of a species complex of at least four species, of which one is reported as a cryptic species. This study provides the first evidence of cryptic speciation in the family Caprellidae, and questions the validity of some traditional morphological characters used to delimit species in the genus Caprella. Our results are consistent with the idea that main factors were probably isolation by distance and ecological traits, promoting diversification in C. penantis. The strong genetic structure reported for this species in the Iberian Peninsula and Moroccan coasts also suggests restriction to dispersal as well as the presence of refugial areas. These results highlight the utility of the COI and 18 S genes in combination with morphological characters for shedding light on systematic questions in caprellids, and patterns of genetic connectivity.
- Subjects
IBERIAN Peninsula; CRUSTACEAN morphology; AMPHIPODA; CRUSTACEAN populations; BIOLOGICAL divergence; ANIMAL genetics; MOROCCANS
- Publication
Journal of Zoological Systematics & Evolutionary Research, 2013, Vol 51, Issue 2, p85
- ISSN
0947-5745
- Publication type
Article
- DOI
10.1111/jzs.12010