Phylogeny and taxonomy of the enigmatic genus Petalidium (Decapoda, Sergestidae), with biological remarks

Petalidium (Decapoda: Dendrobranchiata: Sergestidae) is one of the least known genera of pelagic decapods. On the basis of collections taken during Dana Expedition 1920–22 and 1928–30, we revise the morphology of the genus. To understand the taxonomic status and position of Petalidium within other s...

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Bibliographic Details
Published in:Zoological journal of the Linnean Society 2015-07, Vol.174 (3), p.459-472
Main Authors: Vereshchaka, Alexander L., Lunina, Anastasia A.
Format: Article
Language:English
Subjects:
Acetes
Aristeidae
Aristeomorpha foliacea
cladistic analysis
Decapoda
Dendrobranchiata
Lucifer typus
Luciferidae
morphological characters
pelagic decapods
Penaeoidea
Petalidium
Sergestes
Sergestidae
Sergestoidea
Sergia
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Summary:Petalidium (Decapoda: Dendrobranchiata: Sergestidae) is one of the least known genera of pelagic decapods. On the basis of collections taken during Dana Expedition 1920–22 and 1928–30, we revise the morphology of the genus. To understand the taxonomic status and position of Petalidium within other sergestid genera, we used 150 morphological characters (127 binary, 23 multistate). Three recognized species of Petalidium and eighteen type species representing all other genera of Sergestidae were included as terminals. Characters were polarized using Lucifer typus (Luciferidae: Sergestoidea) and Aristeomorpha foliacea (Aristeidae: Penaeoidea) as the outgroups. Phylogenetic analysis revealed monophyly of Petalidium comprising three species: Petalidium foliaceum Bate, 1881; Petalidium obesum (Krøyer, 1859); and Petalidium suspiriosum Burkenroad, 1937. Phylogenetic analyses also revealed possible monophyly of the clade including 15 new genera of the former Sergia and Sergestes and the position of Lucifer (family Luciferidae) within the clade Sergestidae. These results highlight necessity of future phylogenetic analyses of the remaining genera Lucifer, Acetes, Peisos, and Sicyonella involving all species of these genera and promise interesting changes for the classification of Sergestoidea. Morphological trends within Sergestoidea are discussed, and an emended diagnosis of Petalidium and diagnoses of the species it includes are given. All species are illustrated and biology of the genus is discussed. Keys to species of Petalidium based upon new information are presented. © 2015 The Linnean Society of London
ISSN:0024-4082
1096-3642
DOI:10.1111/zoj.12243