Abstract
The oegopsid squids Abraliopsis and Pterygioteuthis are abundant and diverse genera with taxonomic and distributional problems. Identification and distribution of species in the Mexican Pacific has been somewhat controversial. Here are provided a large series of new records for Abraliopsis affinis, Abraliopsis falco, Pterygioteuthis gemmata, Pterygioteuthis giardi and Pterygioteuthis hoylei from the Gulf of California and off the SW coast of Mexico. All five species were collected in the central or the southern Gulf of California, or in both. Abraliopsis affinis was found in seven samples with a total of 48 specimens, from 21°59' to 24°53'12"N. Abraliopsis falco was much less represented in the samples (14 specimens) but it was found in 10 localities, four of which correspond to the central-southern Gulf of California (north to 27°44'53"N) and six to SW Mexico (south to 16°49'18"N). In the case of Pterygioteuthis gemmata, only two records (three specimens) were obtained, both in the SW Gulf of California, while Pterygioteuthis giardi (nine specimens) records were all from the central Gulf of California (27°44'53” to 25°39'59"N). In the case of Pterygioteuthis hoylei (nine specimens), material was obtained in six localities, also in a restricted latitudinal range (24°23'48” to 25°56'56"N).
Highlights
Cephalopoda is a major group of marine mollusks with almost 1000 species worldwide (Roper et al 1995)
The two oegopsid species were very common in the samples obtained during the TALUD survey (Abraliopsis affinis, 46; A. falco, 18)
Two species of Abraliopsis were collected during the TALUD survey: A. affinis and A. falco
Summary
Cephalopoda is a major group of marine mollusks with almost 1000 species worldwide (Roper et al 1995). An important component of the natural communities, they are active predators mostly on invertebrates (e.g., mollusks, crustaceans) and fishes They are used as prey for many medium to large size marine species (e.g., fish, marine mammals, sea birds) and occupy an important position in the marine food web (Boyle and Rodhouse 2005). Pelagic cephalopods are fast-movinganimals and are able to detect the approach of sampling gears either by vision or d etection of vibrations (Boyle and Boletzky 1996) They are very effective at avoiding nets (Lansdell and Young 2007). The use of large sampling gear like the RTM8 deployed off the Brazilian coast (Vidal et al 2010) has proved very effective at capturing small cephalopods, increasing the potential for their study
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