A comparative study of the gastric ossicles of Trichodactylidae crabs (Brachyura: Decapoda) with comments on the role of diet and phylogeny in shaping morphological traits

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Zoological Science

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Introduction

Materials and Methods

Species of trichodactylid crabs

Preparation of feeding structures for light and scanning microscope observation

Analysis of morphological traits

Results

General considerations of the gastric mill of Trichodactylidae

Similarities and differences of the gastric mill of Trichodactylidae

Lateral teeth

Medial tooth

Accessory teeth

Cardiopyloric valve

Morphological traits

Discussion

The gastric ossicles of Dilocarcininae: morphological considerations

The gastric ossicles of Trichodactylinae: morphological considerations

Comments on phylogenetic and functional aspects of gastric ossicles

Conclusions

Additional Information and Declarations

Competing Interests

The authors declare there are no competing interests.

Author Contributions

Débora A. Carvalho and Verónica Williner conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.

Pablo A. Collins analyzed the data, contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft.

Renata Lima-Gomes and Celio Magalhães contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft.

Maria Victoria Torres contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft, format review.

Data Availability

The following information was supplied regarding data availability:

The specimens described in the manuscript were stored at:

(1) Instituto Nacional de Limnología with the following ID numbers:

D. pagei DP-4

P. argentiniana PASJ-1

Z. collastinensis ZC-22

T. borellianus RTTB-1

T. kensleyi TKST-1.

(2) Instituto Nacional de Pesquisas da Amazônia with the following ID numbers:

D. septemdentatus INPA-800

S. australis SAB-19

S. devillei INPA-SD-03

T. fluviatilis INPA-TF-10.

Funding

This work was supported with three grants under the direction of Verónica Williner: Universidad Nacional del Litoral (CAI+D PI 119), CONICET (PIP 052 2011-2013), FONCYT (PICT Bicentenario 059 2010–2011); and the grants MinCyT-CAPES BR11/14 and CAPES-MinCyT 206/12 under the direction of Pablo Collins and Célio Magalhães. Célio Magalhães received a Research Fellowship (Proc. 303.837/2012-8) from Conselho Nacional de Desenvolvimento Científico e Tecnológico,—CNPq; Renata Lima-Gomes recieved a Doctoral Grant (Proc. 140191/2014-3) from CNPq. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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