Cocconeis vaiamanuensis sp. nov. (Bacillariophyceae) từ Raivavae (Nam Thái Bình Dương) và các loài liên quan: các đặc điểm siêu cấu trúc và nhận xét về chi Cocconeis Ehrenberg đa nguồn gốc

Marine Biodiversity - Tập 51 - Trang 1-23 - 2021
Catherine Riaux-Gobin1,2, Pablo Saenz-Agudelo3, Ewa Górecka4, Andrzej Witkowski4, Genowefa Daniszewska-Kowalczyk4, Luc Ector5
1PSL Research University: CNRS-UPVD-EPHE, USR3278 CRIOBE, University of Perpignan, Perpignan, France
2Laboratoire d’Excellence ‘CORAIL’, University of Perpignan, Perpignan, France
3Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia, Chile
4Institute of Marine and Environmental Sciences, University of Szczecin, Szczecin, Poland
5Environmental Research and Innovation Department (ERIN), Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg

Tóm tắt

Một loài tảo silic đơn bào thuộc nhóm monoraphid nhỏ với hình dạng hình trục-elliptic và các đầu raphe đơn giản đã được phát hiện tại Raivavae (Nam Thái Bình Dương). Đặc biệt, do cấu trúc stria khác nhau trên cả hai vỏ, taxa này được phân loại tại đây là Cocconeis. Loài mới này được tìm thấy trên bờ đá ngầm của lagune rạn san hô, dưới dạng một epiphyte trên lớp rong. Cocconeis vaiamanuensis sp. nov. có thể so sánh với một số loài monoraphid khác có hệ thống raphe đơn giản và hình dạng như que. Taxon mới này có các quá trình nhỏ ở rìa trên vỏ van xương (SV), như đã được báo cáo trước đó cho Cocconeis peltoides. Các quá trình như vậy cũng đã được quan sát trước đây ở Platessa và Psammothidium. Một phân tích cladistic dựa trên siêu cấu trúc cho thấy sự liên hệ giữa một số taxa gần nhau. Cocconeis của phần C. peltoides gần với Psammothidium, trong khi những Cocconeis khác không có quá trình gần hơn với Platessa và Achnanthidium. Một dòng Cocconeis cf. sigillata (SZCZCH1200) đã cho phép tái tạo hệ phả sinh học phân tử. Chữ ký phân tử của Cocconeis cf. sigillata gần với của Lemnicola hungarica. Cocconeis là một chi với các hình thái khác nhau và phức tạp có thể được chia thành các nhánh độc lập (chi). Các quá trình SV có thể là một đặc trưng vestigial gợi nhớ đến một trạng thái tổ tiên.

Từ khóa

#Cocconeis #Bacillariophyceae #Raivavae #siêu cấu trúc #phân loại

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