Carpilius convexus

{{Short description|Species of crab}}

{{Speciesbox

| image = Carpilius convexus.jpg

| genus = Carpilius

| species = convexus

| authority = (Forsskål, 1775)

| synonyms_ref =  {{cite journal|journal=Raffles Bulletin of Zoology |year=2008 |volume=17 |pages=1–286 |title=Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world |author=Peter K. L. Ng |author2=Danièle Guinot |author3=Peter J. F. Davie |name-list-style=amp |url=http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf |format=PDF |url-status=dead |archiveurl=https://web.archive.org/web/20110606061453/http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf |archivedate=2011-06-06 }}

| synonyms =

• Cancer convexus Forsskål, 1775
• Cancer adspersus Herbst, 1790
• Cancer petraeus Herbst, 1801

}}

Carpilius convexus, commonly known as the marbled stone crab,{{cite web|url= https://www.sealifebase.ca/summary/Carpilius-convexus.html|title= Carpilius convexus|author= |date= |website= SeaLifeBase|publisher= SeaLifeBase|access-date= 2023-03-14}} is a species of crab found in the Indo-Pacific, from Hawaii to the Red Sea and South Africa.{{cite journal |author=Regina Wetzer |author2=Joel W. Martin |author3=Sandra E. Trautwein |name-list-style=amp |year=2003 |title=Phylogenetic relationships within the coral crab genus Carpilius (Brachyura, Xanthoidea, Carpiliidae) and of the Carpiliidae to other xanthoid crab families based on molecular sequence data |journal=Molecular Phylogenetics and Evolution |volume=27 |issue=3 |pages=410–421 |url=http://atiniui.nhm.org/pdfs/11491/11491.pdf |format=PDF |doi=10.1016/S1055-7903(03)00021-6 |pmid=12742746 |access-date=2010-05-21 |archive-date=2016-02-22 |archive-url=https://web.archive.org/web/20160222231255/http://atiniui.nhm.org/pdfs/11491/11491.pdf |url-status=dead }} It was first described by Peter Forsskål in 1775 as "Cancer convexus", and has sometimes been treated as a variety of the larger species Carpilius maculatus. The biology of the genus Carpilius is poorly known.

The coloration of Carpilius convexus is a yellow-brown or red, with patches that are mainly brown, growing up to {{Cvt|25|cm}}. Despite us knowing their size, coloration, and habitat, little else is known about their biology.