Estimated Time: 30–40 minutes

Lesson Title: Taxonomic Resources & Research Tools for Myxomycete Systematics

Overview

Modern Myxomycetes taxonomy depends on a distributed ecosystem of databases, specimen collections, sequence repositories, and community-driven observation platforms.
No single resource is sufficient on its own—taxonomic work requires cross-referencing multiple systems to validate names, interpret literature, and confirm identifications.

This lesson provides a practical guide to the core tools used by researchers working in Myxogastria systematics.

Learning Objectives

• Identify major taxonomic databases used in Myxomycetes research
• Understand how type specimens anchor taxonomic names
• Use molecular databases to support phylogenetic interpretation
• Evaluate strengths and limitations of citizen science data

1. Taxonomic Databases (Name Authority Systems)

Eumycetozoa

This is THE authority on nomenclature for Myxomycetes, produced and maintained by Dr. Carlo Lado (see course references)

Index Fungorum

A global nomenclatural database that tracks published fungal and Myxomycetes names.
It is primarily used for confirming name validity, authorship, and publication history.

MycoBank

A parallel system that provides nomenclatural registration, descriptions, and associated metadata.
Often includes additional taxonomic commentary and links to publications.

What these systems do NOT do

• They do not confirm biological accuracy of species concepts
• They do not resolve phylogenetic relationships
• They may retain outdated classifications for nomenclatural stability

2. Type Specimens & Herbaria

Every valid taxonomic name is anchored to a type specimen, which serves as the definitive reference for that species concept.
In Myxomycetes, these are typically dried sporocarps preserved in herbarium collections.

Why type specimens matter:

• They define the application of a species name
• They allow reinterpretation under modern frameworks
• They serve as the final reference in taxonomic disputes

However, many historical types are incomplete or degraded, limiting their usefulness for molecular analysis.

3. Molecular Databases

GenBank

The primary global repository for DNA sequences.
Myxomycete researchers use GenBank to compare SSU, ITS, and LSU sequences across taxa.

Key limitation:

• Misidentified or low-quality sequences are common
• Metadata completeness varies widely

UNITE Database (ITS-focused)

Specialized database for fungal and protist ITS sequences, often used for species-level resolution.

4. Phylogenetic & Visualization Tools

• MEGA: Sequence alignment and tree construction
• RAxML / IQ-TREE: Maximum likelihood phylogenetic inference
• FigTree: Tree visualization and annotation

These tools are essential for translating raw sequence data into interpret-able evolutionary hypotheses.

5. Citizen Science Platforms

iNaturalist

A widely used platform for documenting biodiversity observations, including Myxomycetes.
It provides valuable distribution data but should be interpreted cautiously in taxonomic contexts.

Strengths:

• Large volume of observational data
• Geographic and ecological context
• Community identification feedback

Limitations:

• Miss identifications are common at species level
• Often lacks microscopic or molecular confirmation
• Taxonomic updates may lag behind current literature, but may be quickly updated if flagged appropriately

6. Integrating Multiple Data Sources

Modern taxonomic research requires synthesizing:

• Nomenclatural databases (what names exist)
• Specimen collections (what defines those names)
• Molecular data (how lineages are related)
• Field observations (where organisms occur)

No single source provides a complete picture—robust taxonomy emerges from integration.

7. Common Pitfalls in Taxonomic Research

• Assuming database names reflect current phylogeny
• Over-relying on sequence matches without voucher confirmation
• Using iNaturalist IDs as definitive species confirmations
• Ignoring type material when resolving nomenclatural conflicts

Key Takeaways

• Taxonomy relies on interconnected but imperfect systems
• Type specimens are the ultimate reference point for names
• Molecular databases are powerful but require critical evaluation
• Citizen science data is valuable but not taxonomically definitive

Course Completion Preview

This concludes the core instructional modules for Myxomycetes 401: Taxonomy & Systematics.
Next, we will build the final cumulative assessment (100-point quiz), designed to test conceptual understanding, applied reasoning, and taxonomic interpretation skills.