New species of Acoela (Acoelomorpha) from the Gulf of California

Hooge, Matthew D.; Eppinger, Neil

doi:10.11646/zootaxa.1009.1.1

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…Hooge & Eppinger (2005) recognized that some species of Haplogonaria have non-muscular, or weakly muscular seminal vesicles, while other species have thick musculature (Table 1). We agree with Hooge & Rocha (2006) that these differences likely indicate separate phylogenetic lineages within the genus.…”

Section: Family Proporidae Graff 1882mentioning

confidence: 99%

Two new acoels (Acoelomorpha) of the genus Haplogonaria from the northwest Atlantic

Hooge¹,

Tyler²

2015

Zootaxa

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Two previously unknown species of Haplogonaria (Acoela), H. schillingi sp. nov. and H. baki sp. nov., are described from the coastline of Maine, USA. The two species are morphologically similar to each other but H. schillingi can be distinguished from H. baki by its red pigmentation, its possession of a large genital atrium that branches posteriorly to the seminal vesicle and anteriorly to the vagina, a seminal vesicle that is more ellipsoid-shaped than spherical, and a well-defined wall in the seminal bursa.We provide a description of the new species using live observation, light microscopy of serial sagittal sections, and confocal microscopy imaging of F-actin. We compare the morphology of the new species with other members of the genus and discuss the phylogenetic position of H. schillingi in light of conflicting morphological and molecular data.

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Section: Family Proporidae Graff 1882mentioning

confidence: 99%

Two new acoels (Acoelomorpha) of the genus Haplogonaria from the northwest Atlantic

Hooge¹,

Tyler²

2015

Zootaxa

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How the Worm Got its Pharynx: Phylogeny, Classification and Bayesian Assessment of Character Evolution in Acoela

et al. 2011

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Acoela are marine microscopic worms currently thought to be the sister taxon of all other bilaterians. Acoels have long been used as models in evolutionary scenarios, and generalized conclusions about acoel and bilaterian ancestral features are frequently drawn from studies of single acoel species. There is no extensive phylogenetic study of Acoela and the taxonomy of the 380 species is chaotic. Here we use two nuclear ribosomal genes and one mitochondrial gene in combination with 37 morphological characters in an analysis of 126 acoel terminals (about one-third of the described species) to estimate the phylogeny and character evolution of Acoela. We present an estimate of posterior probabilities for ancestral character states at 31 control nodes in the phylogeny. The overall reconstruction signal based on the shape of the posterior distribution of character states was computed for all morphological characters and control nodes to assess how well these were reconstructed. The body-wall musculature appears more clearly reconstructed than the reproductive organs. Posterior similarity to the root was calculated by averaging the divergence between the posterior distributions at the nodes and the root over all morphological characters. Diopisthoporidae is the sister group to all other acoels and has the highest posterior similarity to the root. Convolutidae, including several "model" acoels, is most divergent. Finally, we present a phylogenetic classification of Acoela down to the family level where six previous family level taxa are synonymized.

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Phylogenetic assessment and systematic revision of the acoel family Isodiametridae

Atherton

Jondelius

2021

Zoological Journal of the Linnean Society

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Isodiametridae is a large family of Acoela with 22 nominal genera and nearly 100 species. Unfortunately, systematics of Isodiametridae, as it stands, is highly problematic. Genera frequently have been proposed without reference to an explicit phylogenetic hypothesis, such that the current classification system holds little or no predictive power. Many taxa do not fit with the family diagnosis, and it is increasingly difficult to determine in which taxon a new species should be described. Herein, we reconstruct the phylogenetic relationships of Acoela with a focus on Isodiametridae using both previously published and new ribosomal and mitochondrial sequence data. Our dataset comprises sequences from 45 species representing 16 of the 22 isodiametrid genera. Our results recovered a well-supported Isodiametridae, but provided further evidence that the family and several genera within require revision. We have updated the classification system of Isodiametridae to be consistent with its phylogeny, including the transference of Otocelis to Otocelididae, Postaphanostoma and Faerlea to Mecynostomidae and Alluna to Actinoposthiidae. Six other genera are placed in synonymy. We review the morphological taxonomy and provide an identification key of the genera in the revised family.

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New species of Acoela (Acoelomorpha) from the Gulf of California

Abstract: From a survey of interstitial acoel flatworms at San Felipe Bay, Baja California, Mexico, the new species Haplogonaria amarilla sp. nov. (Haploposthiidae), Isodiametra bajaensis sp. nov. (Isodiametridae), Praeaphanostoma gusana sp. nov. (Isodiametridae) are described.

Cited by 4 publications

References 9 publications

Two new acoels (Acoelomorpha) of the genus Haplogonaria from the northwest Atlantic

Two new acoels (Acoelomorpha) of the genus Haplogonaria from the northwest Atlantic

How the Worm Got its Pharynx: Phylogeny, Classification and Bayesian Assessment of Character Evolution in Acoela

Phylogenetic assessment and systematic revision of the acoel family Isodiametridae

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