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Journals / Turkish Journal of Zoology / 2012 / Cilt: 36 - Sayı: 1

Phylogeny of basal descendants of cocoon-forming annelids (Clitellata)

Martin Lindsey CHRISTOFFERSEN
Pages
95–119
Publication Date
2012-01-01
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Aphanoneura belong to Oligochaeta.

📌 3 Key Takeaways

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Objective & Hypothesis:Molecular analyses have been unsuccessful in placing the clitellates among annelids.
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Key Findings & Data:I propose the following phylogeny [number of apomorphies within brackets]: (Clitellata sensu lato [6] (Questidae [6] + Apodadrilida, new [2] (Parergodrilidae [3] (Stygocapitella [3] + Parergodrilus [4]) + Oligochaeta [7] (Aphanoneura [2] (Aeolosomatidae [2] + Potamodrilidae [3]) + Dorsopharyngea, new [7] (Hrabeiellidae, new [6] + Euclitellata [5])))).
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Conclusion & Impact:Aphanoneura belong to Oligochaeta.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Key words: Euclitellata · Questidae · phylogenetic systematics

Abstract

Molecular analyses have been unsuccessful in placing the clitellates among annelids. Available morphological characters are ordered into congruent transformation series according to Hennigian principles. Orbiniidae is chosen as the outgroup. I propose the following phylogeny [number of apomorphies within brackets]: (Clitellata sensu lato [6] (Questidae [6] + Apodadrilida, new [2] (Parergodrilidae [3] (Stygocapitella [3] + Parergodrilus [4]) + Oligochaeta [7] (Aphanoneura [2] (Aeolosomatidae [2] + Potamodrilidae [3]) + Dorsopharyngea, new [7] (Hrabeiellidae, new [6] + Euclitellata [5])))). Worms with ring-like clitella surrounding the body almost completely are herein renamed Euclitellata. Clitellata is expanded to include all annelids that, in addition to producing cocoons, have sperm receptacles and a restricted number of gonads. Oligochaeta is established as a valid clade for the hermaphroditic annelids bearing few or no chaetae. Questidae, Parergodrilidae, and Hrabeiella belong to Clitellata. Terrestrial "polychaetes", such as Parergodrilus and Hrabeiella, are actually clitellates. Hrabeiella is the sister group of Euclitellata, despite a secondary loss of spermathecae and clitellum. Aphanoneura belong to Oligochaeta.

Özet

Molecular analyses have been unsuccessful in placing the clitellates among annelids. Available morphological characters are ordered into congruent transformation series according to Hennigian principles. Orbiniidae is chosen as the outgroup. I propose the following phylogeny [number of apomorphies within brackets]: (Clitellata sensu lato [6] (Questidae [6] + Apodadrilida, new [2] (Parergodrilidae [3] (Stygocapitella [3] + Parergodrilus [4]) + Oligochaeta [7] (Aphanoneura [2] (Aeolosomatidae [2] + Potamodrilidae [3]) + Dorsopharyngea, new [7] (Hrabeiellidae, new [6] + Euclitellata [5])))). Worms with ring-like clitella surrounding the body almost completely are herein renamed Euclitellata. Clitellata is expanded to include all annelids that, in addition to producing cocoons, have sperm receptacles and a restricted number of gonads. Oligochaeta is established as a valid clade for the hermaphroditic annelids bearing few or no chaetae. Questidae, Parergodrilidae, and Hrabeiella belong to Clitellata. Terrestrial "polychaetes", such as Parergodrilus and Hrabeiella, are actually clitellates. Hrabeiella is the sister group of Euclitellata, despite a secondary loss of spermathecae and clitellum. Aphanoneura belong to Oligochaeta.

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Cite This Article

CHRISTOFFERSEN, M. L. (2012). Phylogeny of basal descendants of cocoon-forming annelids (Clitellata). Turkish Journal of Zoology, Cilt: 36 - Sayı: 1, 95–119. https://ajindex.com/articles/177100

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