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PROC. BIOL. SOC. WASH. 102(3), 1989, pp. 613-619 CANCER JOHNGARTHI, N. SP. AND CANCER PORTERI (BELL) (CRUSTACEA, DECAPODA): COMPARISONS AND HYPOTHESIS Alberto Carvacho Abstract. — Cancer johngarthi, long mistaken for C. porteri, is described. It is known in the eastern Pacific from Isla Guadalupe, Mexico (29°N), south to Panama (7°N), on soft bottoms at depths exceeding 90 m. Differences from C porteri are discussed with an emphasis on biological aspects: C johngarthi shows an isometric growth of chelipeds in relation to carapace width, while in C. porteri a strong positive allometry is evident after the puberal molt. These two conditions may reflect different mating systems. The species Cancer porteri, described by Bell (1835) as C longipes, was transferred to the genus Platycarcinus, synonym of Cancer, by H. Milne-Edwards & Lucas (1 844), and given its present name by Rath-bun (1930). Nations (1975) included it in the subgenus Cancer s.s. The holotype was collected in Valparaiso, Chile. Faxon (1895) recorded it from Panama Bay as deep as 523 m (Albatross). These two eastern Pacific localities, 33°S and 7°30'N, respectively, were long considered as the geographic dis-tributional limits of the species. Garth (1957) cited a continuous distri-bution "from Callao, Peru to Valparaiso, Chile, 0-24 fms" and an extralimital record from Panama. Nevertheless, he also includ-ed in the list of examined material one male collected by the Lund University Chile Ex-pedition at Talcahuano (36°4 1 'S), some 450 km south of Valparaiso. This latter record has been confirmed by Retamal & Yaiiez (1973). Garth (1961) recorded C porteri from the coast of Sinaloa in the Gulf of California, between 108 and 128 m, and mentioned that the species "may now be reported as a bi-temperate species that transgresses the tropics by submergence, being found in the Gulf of California, the Bay of Panama in 210 to 286 fathoms, and from Peru to Chile in the Sublittoral." Information gathered during almost 150 years supported the idea that C porteri was a eurybathic species with a wide geographic distribution. In fact, the case has been used as a paradigm of the peculiar tropical sub-mergence distribution pattern (Ekman 1953, Garth 1961). Careful study of several specimens re-cently collected off Baja California Sur and the reexamination of virtually all specimens identified with Cancer porteri from the Northern Hemisphere, along with several specimens from Chile and Peru, leads to the conclusion that they belong to two different species. The morphological differences, scarcely evident in young specimens, may express divergence in their mating systems. Cancer johngarthi, new species Figs. 1, 3 A, 4B Cancer longipes, Faxon, 1895:16; Rathbun, 1930:199 (in part). Cancer porteri Rathbun, 1 930: 1 99 (in part); Garth, 1957:50 (in part); 1961:122; Par-ker, 1964:173; Chirichigno, 1970:45 (in part); Retamal & Yanez, 1 973: 1 2 (in part);

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Cancer johngarthi, N-Sp And Cancer porteri (Bell) (Crustacea, Decapoda)

A Carvacho
Proceedings of The Biological Society of Washington 102: 613-619 (1989)

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