Continuous and non-seasonal reproductive cycle of the alien species Diopatra neapolitana (Onuphidae, Annelida) in a tropical bay of SW Atlantic

Bergamo, Gilberto; Carrerette, Orlemir; Nogueira, João Miguel de Matos

doi:10.1016/j.ecss.2019.106479

Cited by 11 publications

(26 citation statements)

References 44 publications

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“…The species was originally described due to the presence of dorsal papillae, which were later shown to be sperm storage organs in simultaneous hermaphrodite individuals of D. neapolitana from the northern Spanish coast [427]. Similar papillae were later described in the Brazilian population of D. neapolitana [473].…”

Section: Distribution Patterns and Diversitymentioning

confidence: 84%

“…Most onuphid species are known to have rather restricted geographical ranges; however, several examples of widely distributed species confirmed with genetic data were reported recently. Diopatra neapolitana originally described from the Mediterranean and widespread in Iberian Atlantic was subsequently reported from the Suez Canal, Egypt, the Brazilian Atlantic, and India [473,474]. Its sister species, Diopatra aciculata Knox and Cameron, 1971, common in Australian east coastal waters, has been recently reported from the South Africa estuaries and also from Egypt.…”

Section: Distribution Patterns and Diversitymentioning

confidence: 99%

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The Current State of Eunicida (Annelida) Systematics and Biodiversity

et al. 2021

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In this study, we analyze the current state of knowledge on extant Eunicida systematics, morphology, feeding, life history, habitat, ecology, distribution patterns, local diversity and exploitation. Eunicida is an order of Errantia annelids characterized by the presence of ventral mandibles and dorsal maxillae in a ventral muscularized pharynx. The origin of Eunicida dates back to the late Cambrian, and the peaks of jaw morphology diversity and number of families are in the Ordovician. Species richness is heterogeneous among the seven recent families, with more than half of the valid species belonging to the Eunicidae + Onuphidae clade, one of the latest clades to diverge. Eunicidans inhabit soft and hard substrates from intertidal to deep waters in all oceans. The few freshwater species are restricted to Histriobdellidae, a family exclusively commensal/parasite of crustaceans. The reproductive biology, development and ecology of most families are poorly known and the information available suggests low dispersal ability. However, all families have records of widely distributed species. Scrutiny of these wide distributions has often revealed the presence of exotic species or more than one species. The exploration of the deep-sea and of new habitats has led to recent descriptions of new species. Furthermore, the revision of type specimens, the examination of new morphological features and the use of molecular data have revealed hidden biodiversity under unjustified synonyms, poor understanding of morphological features and incomplete descriptions. Molecular studies are still very few or nonexistent for the families Histriobdellidae, Hartmaniellidae, Lumbrineridae and Oenonidae. The integration of new methodologies for morphological and molecular study, along with information on biological and ecological traits appears to be the path to improve the knowledge on the diversity of Eunicida.

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Section: Distribution Patterns and Diversitymentioning

confidence: 84%

Section: Distribution Patterns and Diversitymentioning

confidence: 99%

The Current State of Eunicida (Annelida) Systematics and Biodiversity

et al. 2021

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“…Ventral parapodial lobes ( Figure 2 D,E) were only present in the 13 species constituting Clade 1, representing an exclusive synapomorphy for this clade. This character is not common outside Eastern Atlantic waters, only being reported in D. neapolitana , present in both Western South Atlantic and the Indian Ocean in addition to the East Atlantic, and in D. aciculata inhabiting Australian waters, South Africa, and the Red Sea [ 37 , 38 ]. All species in Clade 1 have low to moderate number of denticles on the pectinate chaetae (5–16) and possess ceratophores with numerous rings (in most species 15–20) ( Figure 2 ) with the exception of Dioptara sp.…”

Section: Discussionmentioning

confidence: 99%

“…Due to the historically poor understanding of Diopatra taxonomy, it is likely that these cosmopolitan records hide a significant undescribed diversity. Nonetheless, Diopatra neapolitana has recently been confirmed with molecular data to occur in the Southwest Atlantic [ 37 ], Egypt and Southeast India [ 38 ], but it is hypothesized that large species of Diopatra are often introduced by anthropogenic means, mostly due to their use as fish bait or aquaculture [ 37 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Phylogeny and Cryptic Diversity of Diopatra (Onuphidae, Annelida) in the East Atlantic

Hektoen

Willassen

Budaeva

2022

Biology

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Diopatra Audouin & Milne-Edwards, 1833 is a species rich genus that is common in tropical and subtropical regions. The genus is readily identified by its striking, spiral branchiae, but species identification has historically been challenging due to a high variation in diagnostic characters used. This study aims to reconstruct the phylogeny of Diopatra with molecular markers and assess the species diversity of West African Diopatra with the species delimitation programs bPTP and BPP. Specimens were collected from Morocco to Angola, and the markers COI, 16S and 28S were sequenced from 76 specimens. The constructed phylogeny retrieved Diopatra as monophyletic, as well as five well supported clades within the genus. All clades were defined by morphological characters, some of which have previously not been considered to have high phylogenetic or taxonomical value. Species delimitation analyses recovered 17 new species, several of which were not readily identified morphologically. One species complex comprising between one and 12 species was left unresolved due to incongruence between the species delimitation methods and challenging morphology. Our results indicate that the diversity of Diopatra is significantly underestimated, where this regional study near to doubled the number ofknown species from the East Atlantic.

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“…There is, however, no doubt that the species is undergoing range expansion in South Africa, but until the native range is elucidated, it is unclear if this expansion is extralimital or invasive (sensu Robinson et al, 2016). However, recent evidence confirms the alien presence of D. neapolitana in India (Parameswaran, 1973;Elgetany et al, 2020) and Brazil (Bergamo et al, 2019), thus other identifications outside the Mediterranean, such as in Vietnam (Tue et al, 2012) and Mozambique (MacNae & Kalk, 1958) may well be correct. Morphologically D. aciculata and D. neapolitana are very similar and exceedingly difficult to tell apart, although the longer dorsal cirri, wider bodies and longer antennae of D. aciculata (Elgetany et al, 2020) may be the best distinguishing characters in accordance with recent findings.…”

Section: Taxonomic and Distributional Implicationsmentioning

confidence: 99%

Moonshine worms (Diopatra aciculata: Onuphidae, Annelida) in the Knysna Estuary, South Africa; taxonomy and distribution

2020

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Moonshine worms are a popular bait species used for fishing. The taxon was not detected during surveys of the macrobenthos conducted in Knysna in the 1940s and 1990s, and was first reported as a harvested bait species in the mid-2000s, suggesting that it appeared for the first time in the estuary in the last three decades. A previous molecular analysis identified the worms as Diopatra aciculata, a species first described from Australia. This study provides an updated detailed morphological description of D. aciculata in South Africa to facilitate future identifications and also investigates the species' distribution and population size in the Knysna Estuary. Specimens were examined by scanning electron, stereo- and compound microscopes. Diopatra aciculata has tubes that protrude from the sediment in sandy areas, often decorated with algae and shell fragments; a large body size, up to 600 mm long and 11.5 mm wide. It has 10–18 rings on ceratophores; 5–10 teeth on pectinate chaetae; uni- and bidentate pseudo-compound falcigers and dorsal cirri approximately as long as branchiae. Diopatra aciculata was detected up to 12 km from the mouth of the Knysna Estuary with densities measured at 18 sampled sites. Statistical analysis retrieved high and low density groups that were significantly different from one another (Kruskal-Wallis H(14, 800) = 376.55; P = 0.01), but distribution of high density sites was patchy. We estimate that the population comprises 20–24 million individuals. Given the size of individual worms and the population estimate, this species can be expected to have significant ecological impacts in the estuary.

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Continuous and non-seasonal reproductive cycle of the alien species Diopatra neapolitana (Onuphidae, Annelida) in a tropical bay of SW Atlantic

Cited by 11 publications

References 44 publications

The Current State of Eunicida (Annelida) Systematics and Biodiversity

The Current State of Eunicida (Annelida) Systematics and Biodiversity

Phylogeny and Cryptic Diversity of Diopatra (Onuphidae, Annelida) in the East Atlantic

Moonshine worms (Diopatra aciculata: Onuphidae, Annelida) in the Knysna Estuary, South Africa; taxonomy and distribution

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