What is the current genus name for the saccharolytic group formerly placed within Bacteroides? (Recognize the reclassification of oral anaerobes.)

Introduction:
Black-pigmented oral anaerobes once grouped under “Bacteroides” were reclassified based on biochemical traits and genetics. This question examines knowledge of the modern names attached to saccharolytic taxa.

Given Data / Assumptions:

• “Saccharolytic” indicates carbohydrate-fermenting capability.
• We focus on oral anaerobic rods historically termed “Bacteroides.”

Concept / Approach:
Reclassification divided these organisms into Prevotella (saccharolytic) and Porphyromonas (asaccharolytic). Therefore, the saccharolytic group corresponds to Prevotella, while Porphyromonas rely on peptides rather than sugars.

Step-by-Step Solution:
Identify trait: saccharolysis implies sugar fermentation. Map trait to genus: saccharolytic → Prevotella; asaccharolytic → Porphyromonas. Select Prevotella as the correct current genus.

Verification / Alternative check:
Contemporary oral microbiology references use Prevotella for melaninogenic, sugar-fermenting species such as P. melaninogenica and P. intermedia.

Why Other Options Are Wrong:

• Porphyromonas: Asaccharolytic; not the saccharolytic group.
• Bacteroides: Historical umbrella; not the present correct genus for these oral species.
• None of these: Incorrect because Prevotella fits exactly.

Common Pitfalls:
Memorizing names without linking to metabolic traits leads to confusion; remember the saccharolytic vs asaccharolytic split.

Final Answer:
Prevotella is the current genus for the saccharolytic group.