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Issue: Vol. 5497 No. 2: 23 Aug. 2024
Type: Article
Published: 2024-08-23
DOI: 10.11646/zootaxa.5497.2.2
Page range: 194-208
Abstract views: 343
PDF downloaded: 24

A critical update of Mediterranean chitons (Mollusca: Polyplacophora) with the description of new taxa

Independent Researcher; via Briscata 16/6; 16154 Genova; Italy
Independent Researcher; via Bengasi 4; 16153 Genova; Italy
Istituto di Scienze Marine (ISMAR-CNR); via Gobetti 101; 40129 Bologna; Italy; Stazione Zoologica Anton Dohrn; Villa Comunale; 80121 Napoli; Italy
Mollusca Mediterranean Sea Polyplacophora new species Recent Pleistocene

Abstract

The Mediterranean Sea houses a rather diverse chiton fauna (Mollusca: Polyplacophora). Four are here described as new, all based upon loose valves recovered from biogenic sediments: Leptochiton freiwaldi sp. nov., Hanleya schwabei sp. nov., “Ischnochiton” luquei sp. nov., Acanthochitona barbarae sp. nov. The updated Mediterranean Sea chiton fauna comprehends as many as 47 species, distributed in the families Leptochitonidae (15 species), Hanleyidae (3 species), Ischnochitonidae (7 species), Callistoplacidae (1 species), Chaetopleuridae (1 species), Callochitonidae (3 species), Chitonidae (5 species), Lepidochitonidae (6 species), Tonicellidae (1 species), Acanthochitonidae (5 species). Seven taxa are only known from loose valves: Leptochiton antondohrni, L. freiwaldi sp. nov., Hanleya schwabei sp. nov., “Ischnochiton” luquei sp. nov., Lepidochitona marcoi, Boreochiton ruber and Acanthochitona barbarae sp. nov. Similarly to other deep-sea mollusks described from the Mediterranean basin, some of them could possibly belong to last glacial Pleistocene submerged assemblages. On the contrary, Hanleya schwabei sp. nov. and Acanthochitona barbarae sp. nov. occur also at shallower depths, and are assigned to the modern Mediterranean fauna. The presence of the Atlantic taxon Chaetopleura angulata could be an accidental introduction into the Mediterranean. The species Tegulaplax hululensis, considered a Lessepsian immigrant, is a potentially forerunner of a more massive introduction of tropical Polyplacophora via the Red Sea. This study set a baseline for a better understanding of the evolutionary and biogeographic patterns of the Mediterranean Polyplacophora.

 

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