Phylogenetic Position of the Adeleorinid Coccidia (Myzozoa, Apicomplexa, Coccidia, Eucoccidiorida, Adeleorina) Inferred Using 18S <scp>rDNA</scp> Sequences
Bibliographic record
Abstract
Investigating the evolutionary relationships of the major groups of Apicomplexa remains an important area of study. Morphological features and host-parasite relationships continue to be important in the systematics of the adeleorinid coccidia (suborder Adeleorina), but the systematics of these parasites have not been well-supported or have been constrained by data that were lacking or difficult to interpret. Previous phylogenetic studies of the Adeleorina have been based on morphological and developmental characters of several well-described species or based on nuclear 18S ribosomal DNA (rDNA) sequences from taxa of limited taxonomic diversity. Twelve new 18S rDNA sequences from adeleorinid coccidia were combined with published sequences to study the molecular phylogeny of taxa within the Adeleorina and to investigate the evolutionary relationships of adeleorinid parasites within the Apicomplexa. Three phylogenetic methods supported strongly that the suborder Adeleorina formed a monophyletic clade within the Apicomplexa. Most widely recognized families within the Adeleorina were hypothesized to be monophyletic in all analyses, although the single Hemolivia species included in the analyses was the sister taxon to a Hepatozoon sp. within a larger clade that contained all other Hepatozoon spp. making the family Hepatozoidae paraphyletic. There was an apparent relationship between the various clades generated by the analyses and the definitive (invertebrate) host parasitized and, to lesser extent, the type of intermediate (vertebrate) host exploited by the adeleorinid parasites. We conclude that additional taxon sampling and use of other genetic markers apart from 18S rDNA will be required to better resolve relationships among these parasites.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".