Figure 016. Minuca longisignalis

Creator

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

Preview

Identifier

Figure 16

Medium

photograph

Date Created

5-2025

Keywords

Fiddler crabs;

Description

Alt Text: Composite photograph of the Minuca longisignails 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 16. Minuca longisignalis (Salmon and Atsaides, 1968). UNI 247. Collected: 20-Jun-2002, USA, Alabama, Baldwin Co., Mobile Bay, Tenesaw River at I-10 bridge (30.67395, -87.95417). Scale Bar = 10mm. (A) Dorsal view. (B) Front view. (C) Inner cheliped. (D) Ocular view. (E) Ambulatory. (F) Comparison of legs between M. minax and M. longisignalis. (G) Color Photo. (H) Distribution Map (Finke 2024).

Species Description: Large species < 25.6 mm. Carapace length about 67% width. Frontal region about 38% carapace width. Surface finely granular. H-depression shallow; cardiac-mesogastric region slightly swollen. Dactyl and pollex, wide; slight longer than manus. Gape wide; dactyl with four larger proximal tubercles; pollex with two large tubercle, on at mid-length the other near terminus. Outer manus with fine tubercles. No red pigment in articulations. On inner manus, oblique ridge highly developed near carpal cavity. Line of tubercles on inner pollex from distal tip to articulation. Line bifurcates at base of articulation. On walking legs, merus wide; width 43% of length. Ventral margin with a few long setae, marginal pile and pubescence. Species found only along the northern coast of the Gulf of Mexico between the Rio Grande in Texas and Cedar Key, Levi Co., Florida (Fig. 16H). This species is often confused with Minuca minax. A walking leg from M. longisignalis and are compared in Fig. 16F.

Comments

This composite image is of the Minuca longisignailis 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 247

Year Collected

2002

Collection Location

30.67395, -87.95417

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 016. Minuca longisignalis" (2025). Fiddler Crabs Image Gallery. 9.
https://scholarworks.uni.edu/fiddlercrabs/9