Accepted by J. Mendoza: 1 Aug. 2018; published: 4 Sept. 2018 195 ZOOTAXA ISSN 1175-5326 (print edition) ISSN 1175-5334 (online edition) Copyright © 2018 Magnolia Press Zootaxa 4471 (1): 195–200 http://www.mapress.com/j/zt/ Correspondence https://doi.org/10.11646/zootaxa.4471.1.13 http://zoobank.org/urn:lsid:zoobank.org:pub:BD993B31-CE89-434F-AB55-D76ACF112927 Notes on Chasmocarcinus latipes Rathbun, 1898 (Brachyura, Goneplacoidea, Chasmocarcinidae) from the Gulf of California, Mexico MICHEL E. HENDRICKX 1,3 & MARGARITA HERMOSO-SALAZAR 2 1 Laboratorio de Invertebrados Bentónicos, Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, PO Box 811, Mazatlán, 82000 Sinaloa, Mexico 2 Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO), Liga Periferico-Insurgentes Sur, 4903, Tlalpan, 14010 Mexico, D.F., México. 3 Corresponding author. E-mail: michel@ola.icmyl.unam.mx Brachyuran crabs from the Mexican Pacific and surrounding areas are well known and have been treated in several monographs (e.g., Garth 1958; Hendrickx 1997, 1999). Checklists of species occurring off western Mexico and the eastern tropical Pacific are also available (e.g., Hendrickx 1993, 1995, 2005). In many cases, particularly in species inhabiting the continental shelf or deeper waters, however, there is a significant lack of records due to sampling difficulty and cost. A recent review of Chasmocarcinidae by Ng & Castro (2016) set the number of species of this family to 51 in 16 genera and 3 subfamilies. As revised by Ng & Castro (op. cit.), the genus Chasmocarcinus now contains 11 species, and is the only genus of Chasmocarnidae occurring in the eastern Tropical Pacific where it is represented by three species: C. gemmatus Ng & Castro, 2016 (Costa Rica); C. latipes Rathbun, 1898 (west coast of Baja California and Gulf of California, Mexico, to Peru); and C. longipes Garth, 1940 (Costa Rica to Ecuador). Chasmocarcinus ferrugineus Glassell, 1936 and C. panamensis Serène, 1964, are now considered junior subjective synonyms of C. latipes and C. longipes, respectively (Garth 1940, Ng & Castro 2016). During sampling operations in the Gulf of California, Mexico, a series of specimens of C. latipes was collected and is reported herein, and additional notes on their habitat are documented. The specimens were collected during several research cruises (SIPCO I, April 1981; CORTES 2 and 3, March and August 1985; WAGNER-02, July-August 2010) aboard the R/V El Puma, of the Universidad Nacional Autónoma de México, in the Gulf of California. Environmental data were taken from Hendrickx & Salgado-Barragán (1991) and Hendrickx (1997). Illustrations of specimens or part of the specimens were drawn (Camera Lucida) or photographed with a digital camera or with a scanning electron microscope. Most of the material is kept in the "Regional Collection of Marine Invertebrates" (ICML-EMU), in Mazatlán, Mexico. Abbreviations used are: St., sampling station; M, male; F, female; FF, ovigerous female; CW, carapace width. Taxonomy Chasmocarcinidae Serène, 1964 Chasmocarcininae Serène, 1964 Chasmocarcinus Rathbun, 1898 Chasmocarcinus latipes Rathbun, 1898 (Figs. 2‒4) Chasmocarcinus latipes Rathbun, 1898: 602, pl. 42, fig. 5; 1918: 57, textfigs. 25 and 26.—Crane, 1937: 75.—Garth, 1948: 52; 1960: 118; 1961: 156.—Hendrickx, 1992: 9, table 9; 1993: 314, table 18; 1995: 139 (list); 2005: 187 (list).—Ng et al., 2008: 76 (list).— Ng & Castro, 2016: 12 (key), 22, figs. 1E, 4A–E, 5D, 22A, 29C–E, 36E–H, 50A, C, D, 57A, 65A–D, 84A, 89E, F. Chasmocarcinus ferrugineus Glassell, 1936: 216.—Crane, 1937: 75, pl. 7, fig. 24.—Garth, 1940: 92.—Ng et al., 2008: 76 (list). Material examined. SIPCO I, St. B1 (23º08'48"N, 106º25'24"W), 25/IV/81, 1 F (CW 12.1 mm), 27 m, oyster dredge. CORTES 2, St. 49A (26º58'30"N, 111º50'48"W), 19/III/85, 1 F (CW 8.3 mm), between 98 and 114 m, Otter trawl net (ICML-EMU-3474A); St. 49B (26º58'46"N, 111º53'24"W), 19/III/85, 8 M (CW 9.7–12.6 mm) and 5 F (CW 8.2–11.8 mm), 68 m, Otter trawl net (ICML-EMU-3474B); same station, 2 M (CW 13.4 and 13.6 mm) (ICML-EMU-3916). CORTES 3, St. 44 (29º58'42"N, 112º53'36"W), 5/VIII/85, 1 FF (CW 9.4 mm), 111 m, Van Veen dredge (ICML- EMU-3920); St. 49B (26º59'12"N, 111º53'24"W), 7/VIII/85, 1 M (CW 4.4 mm), 68 m, Otter trawl net (ICML-EMU-