Oceanic boundaries in the western Atlantic delimitate novel lineages in the tanaidacean Chondrochelia dubia (Tanaidacea: Leptocheliidae) species complex

Author(s)

Iwasa-Arai, Tammy ; Siqueira, Silvana G. L. ; Sobral-Souza, Thadeu ; Andrade, Sonia C. S. ; Leite, Fosca P. P.

• Document type: Journal article
• Source: Hydrobiologia; v. N/A, p. 22-pg., 2024-10-30.

Abstract

Chondrochelia dubia is regarded as a cosmopolitan tanaidacean with tubicolous lifestyle that is commonly found in shallow waters. The lack of a dispersive larval stage, however, suggests that several endemic cryptic species might exist. Here, we studied C. dubia specimens collected from across 5000 km of distribution in the western Atlantic. We confirm its species complex status and identify five independent species, including C. brasiliensiscomb. nov. Using molecular analyses, we show that the genetic diversity and structure of C. dubia and C. brasiliensis strongly differ from one another, suggesting independent evolution of each lineage with a geographic separation at the Paragua & ccedil;u River mouth. The paleodistribution simulation suggests a considerable spatio-temporal expansion for C. dubia and C. brasiliensis since the Last Glacial Maximum (LGM), when the species was restricted to the submerged continental shelf. In summary, we observe that the simplified morphology of the Chondrochelia dubia complex hides a great diversity of species within the western Atlantic, approximately one per ecoregion. Combination of detailed morphological analyses with molecular and ecological data shall further elucidate the systematics of the Chondrochelia dubia complex worldwide. (AU)

• FAPESP's process: 18/00488-7 - Species delimitation, comparative phylogeography and conectivity of Peracarida (Crustacea: Eumalacostraca) associated with Sargassum in Brazil with emphasis on insular populations
• Grantee: Tammy Iwasa Arai
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/10313-0 - Build-up of scientific collections of marine invertebrates: strategies for biodiversity conservation
• Grantee: Antonia Cecília Zacagnini Amaral
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 15/20139-9 - Seascape genetics and evaluation of expression profiles on marine invertebrates on Brazilian Southeast coast
• Grantee: Sónia Cristina da Silva Andrade
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 17/16837-8 - Protection efficiency in coastal habitats: an integrated approach in the study of macrophyte and associated invertebrates diversity at areas under different conservation status
• Grantee: Fosca Pedini Pereira Leite
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants