<i>Arabella aracaensis</i>, a new species with growth rings on its mandibles, and some remarks on the endoparasitic<i>Labrorostratus prolificus</i>(Polychaeta: Oenonidae) from southeast Brazil

Steiner, Tatiana Menchini; Amaral, A. Cecília Z.

doi:10.1080/00222930903219988

Cited by 9 publications

(9 citation statements)

References 8 publications

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“…In contrast, other species have the left maxilla I falcate with a denticulated base and the right maxilla I as a denticulated rectangular plate much shorter than maxillae II [14,364]. The mandibles of oenonids are not fused, and without calcified distal plates, lacking growth lines [13], except for Oligognathus (whose mandibles are fused in a single horseshoe-shaped piece), Drilonereis (where the mandibles may be absent in some species), or Arabella aracaensis Steiner and Amaral, 2009 (with growth lines on its mandibles).…”

Section: Morphologymentioning

confidence: 99%

“…Most of the studied species are gonochoric without sexual dimorphism. Amaral [371] and Steiner and Amaral [51] reported adult individuals of the parasitic species Labrorotratus prolificus Amaral, 1977 reproducing asexually by stolons. The study of the reproductive biology of Halla parthenopeia (delle Chiaje, 1828) showed that the appearance of mature sperm occurs in two periods, during late April and in late December; while spawning occurs in May and January [372].…”

Section: Feeding and Life Historymentioning

confidence: 99%

“…Oenonidae includes free-living species, endoparasitic species, and species that, during their ontogenetic development, have an endoparasitic phase but are free-living as adults [51,371,373,374].…”

Section: Habitats and Ecologymentioning

confidence: 99%

“…However, even in the latter the planktonic life span is expected to be relatively short, since all known eunicidan larvae are lecitotrophic [50]. Asexual reproduction happens at least by scissiparity (Oenonidae, [51]) and architomy (Dorvilleidae, [52]).…”

Section: Introductionmentioning

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: Morphologymentioning

confidence: 99%

Section: Feeding and Life Historymentioning

confidence: 99%

Section: Habitats and Ecologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Current State of Eunicida (Annelida) Systematics and Biodiversity

et al. 2021

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“…This species has been described with worldwide distribution and is probably a complex of species (Colbath 1989; Zanol and Ruta 2015). Studies on the variation of the symmetry in maxillae and modified ventral chaetae should be conducted to know the polymorphism in species of the genus Arabella (Steiner and Amaral 2009). That would be a challenge to species identification and new descriptions, once Oenonidae species are usually collected in low densities (Zanol 2010, Zanol and Ruta 2015).…”

Section: Taxonomymentioning

confidence: 99%

A new species of Paraonis and an annotated checklist of polychaetes from mangroves of the Brazilian Amazon Coast (Annelida, Paraonidae)

Ribeiro¹,

Alves²,

Almeida³

et al. 2018

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The polychaete fauna from the mangroves of the Amazon Coast in Maranhão state, Brazil, is reported in this study. Fourteen species are listed, namely Alitta succinea (Leuckart, 1847); Arabella (Arabella) iricolor Montagu, 1804; Capitella capitata (Fabricius, 1780) complex; Exogone (Exogone) breviantennata Hartmann-Schröder, 1959; Heteromastus filiformis (Claparède, 1864); Isolda pulchella Müller, 1858; Mediomastus californiensis Hartman, 1944; Namalycastis fauveli Nageswara Rao, 1981; Namalycastis geayi (Gravier, 1901); Namalycastis senegalensis (Saint-Joseph, 1901); Nephtys simoni Perkins, 1980; Paraonis amazonica sp. n.; Sigambra bassi (Hartman, 1945); and Sigambra grubii Müller, 1858. Among them, Namalycastis fauveli and Namalycastis geayi are recorded for the first time in Brazil. Paraonis amazonica sp. n. is a new species for science, characterized by a rounded prostomium, 4–8 pairs of foliaceous branchiae, absent eyes, and two types of modified neurochaetae, acicular and hook-shaped.

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Jaw morphology and function in Drilonereis cf. filum (Oenonidae, Annelida)

Tzetlin

Vortsepneva

Zhadan

2023

Journal of Morphology

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Representatives of the extant family Oenonidae (Annelida, Eunicida) have a prionognath jaw apparatus, with maxillae having forceps-like elements, a number of asymmetrical dentate plates and long slender carriers, which is characteristic of some fossil forms known from the Paleozoic epoch. Therefore, data on the fine structure and functional morphology of Oenonidae jaws are helpful for the interpretation of fossil materials. The fine structure of the jaw apparatus and the ventral pharyngeal organ is studied in one species of the Oenonidae (Annelida)-Drilonereis cf. filum. The material was collected in the soft bottom of Marseille Bay (Mediterranean) and examined with the help of TEM and histological techniques. A three-dimensional (3D) reconstruction was made from a complete series of semithin sections. The entire jaw apparatus is about 500 µm in length; it includes ventral mandibles and four pairs of maxillae, connected with long paired dorsal carriers and an unpaired ventral carrier. While retracted, it reaches the VIII−XI chaetigers.The most solid part of the maxillary apparatus, that is, maxillae I and II, are 2.5−5 µm thick.The plate consists of a monolithic array of merged scleroprotein granules in which perforations, that is, spaces remaining from microvilli, are visible; the basal part of the maxillary plate is a layer of loosely arranged collagen fibers penetrated with microvilli and has no signs of sclerotization. A study of the jaws of Drilonereis cf. filum showed the presence of common jaw patterns in Eunicida order. Like the jaws of Dorvilleidae, Eunicidae, Onuphidae, and Lumbrineridae, the jaws of Drilonereis are formed at the basis of a typical annelid cuticle's transformation with epi-and basicuticular layers, and its impregnation by merging scleroprotein granules. Through the nature of sclerotization, the jaws of D. cf. filum are similar to those of Dorvilleidae, Histriobdellidae, and the juvenile jaws of Mooreonuphis stigmatis (Onuphidae). Analysis of the 3D-reconstructions of the D.cf. filum jaw apparatus shows that the MxI of this species, and probably of other Oenonidae with dorsal and ventral carriers, can make grasping motions by fixing the joint of the right and left MxI in the two-door hinge type. In general, the overall structure of the jaw apparatus of D. cf. filum and the mechanics of its work shows greater similarity with that of Dorvilleidae than with the jaw apparatus of extant Labidognatha and Simmetrognatha (Onuphidae, Eunicidae, Lumbrineridae). The need for compactization of the jaw apparatus when moving in dense sediment or in the burrows is probably one of the factors determining its structure.

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Arabella aracaensis, a new species with growth rings on its mandibles, and some remarks on the endoparasiticLabrorostratus prolificus(Polychaeta: Oenonidae) from southeast Brazil

Cited by 9 publications

References 8 publications

The Current State of Eunicida (Annelida) Systematics and Biodiversity

The Current State of Eunicida (Annelida) Systematics and Biodiversity

A new species of Paraonis and an annotated checklist of polychaetes from mangroves of the Brazilian Amazon Coast (Annelida, Paraonidae)

Jaw morphology and function in Drilonereis cf. filum (Oenonidae, Annelida)

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