Cnemidocarpa verrucosa: Genetic and Morphological Evidence of a Cryptic Antarctic Species

Antarctic Peninsula and South American waters host fifteen populations of the ascidian Cnemidocarpa verrucosa sensu lato. Genetic data from mitochondrial COI and nuclear 18S genes suggest the nominal species comprises two distinct, sympatrically distributed species. This dataset provides molecular and morphological evidence for this cryptic diversity, offering tools for species identification and insights into polar speciation.

Use Cases

• Phylogeographic analysis of Antarctic marine invertebrates based on COI and 18S gene sequences.
• Testing species boundaries and sympatric speciation hypotheses using genetic distance distributions.
• Correlating genetic clades with morphological traits, such as the presence of a basal disc, for field identification.
• Studying patterns of endemism and genetic diversity in isolated Southern Ocean ecosystems.

Strengths

• Data is derived from fifteen distinct populations across a broad geographic range including the Antarctic Peninsula and South America.
• Combines molecular (mitochondrial and nuclear genes) and morphological evidence to address a taxonomic question.
• Dataset is associated with peer-reviewed, open-access research published on multiple academic platforms.

Limitations

• Specific column names, row counts, and file formats are not provided in the available metadata.
• The dataset's size and the exact date of its last update are unknown.
• Relies on inferred data types and structure from the description rather than explicit documentation.

Provenance

Source

Micaela Ruiz, Universidad Nacional de Córdoba

Collection Method

Genetic sequencing (COI and 18S genes) and morphological re-evaluation of ascidian samples.

Geography

Antarctic Peninsula and South America (Burdwood Bank/MPA Namuncurá)