Figure 006. Leptuca cumulanta

Creator

Abby Hutchins, University of Northern IowaFollow
Amber Finke, University of Northern IowaFollow
Carl L. Thurman, University of Northern IowaFollow

Preview

Identifier

Figure 6

Medium

photograph

Date Created

5-2025

Keywords

Fiddler crabs;

Description

Alt Text: Composite photograph of the Leptuca cumulanta fiddler crab which includes several black & white images of different views of the crab, a color photograph, and a distribution map.

Composite Image Description: Figure 6. Leptuca cumulanta (Crane, 1943). UNI 732. Collected: 30 July 2018, North Atlantic Ocean, Guyana, East Demerara, Pigeon Island (LBI), mud on canal and mangroves (6.81521, -58.06480). Space bar = 10mm. (A) Dorsal view. (B) Front view. (C) Inner cheliped. (D) Ocular view. (E) Ambulatory. (F) Color Photo. (G) Distribution Map (Finke 2024).

Species Description: Small species (width < 16 mm). Carapace shiny, smooth and strongly convex but not cylindrical (Fig. 6A). Carapace length 64% width. Frontal region 26% carapace width (Fig. A,D). Eyestalks short and thick. Anterior lateral margins straight and parallel (Fig. 6A). Dactyl and pollex of cheliped about same length as manus (Fig. 6 B, C). Tubercles line gap, pollex lined fully with tubercles, serrate elevation near distal end. Fused tubercles forming larger tooth near mid-line of pollex. Proximal edge of dactyl with large tubercles. Tip of dactyl pointed down and over hanging pollex, gap large (Fig. 6B,C). Oblique ridge on inner cheliped for tubercle carina following front edge of carpal cavity (Fig. 6C). Walking legs without many setae (Fig. 6E). Merus width averages 43% length: female 49%, male 40%. Found in southern Caribbean and coast on South American south to the states of Rio de Janeiro and Sao Paulo (Fig. 6G). This may be an invasive species moving southward.

Comments

This composite image is of the Leptuca cumulanta fiddler crab. It is a part of the parent Fiddler Crabs Image Gallery collection at the University of Northern Iowa, which has images of Fiddler Crabs located in the Atlantic Ocean and the Gulf of Mexico from the following genera: Afruca, Leptuca, Minuca, and Uca.

Object Description

1 PNG file

UNI Specimen Number

UNI 732

Year Collected

2018

Collection Location

6.81521, -58.06480

Gender

male

Copyright

©2025 Abby Hutchins, Amber Finke, and Carl L. Thurman

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License

Type

Image

Language

en

File Format

image/png

Recommended Citation

Hutchins, Abby; Finke, Amber; and Thurman, Carl L., "Figure 006. Leptuca cumulanta" (2025). Fiddler Crabs Image Gallery. 2.
https://scholarworks.uni.edu/fiddlercrabs/2