Agononida longipes (A. Milne-Edwards, 1880)

Vazquez-Bader, Ana Rosa & Gracia, Adolfo, 2016, Diversity and distribution of Chirostyloidea and Galatheoidea (Decapoda, Anomura) in the Southern Gulf of Mexico, ZooKeys 612, pp. 1-30 : 6-7

Taxon classification Animalia Decapoda Munididae

Agononida longipes (A. Milne-Edwards, 1880)

Material examined.

BATO stn. 24, 1 male, stn. 26, 1 ovigerous female, stn. 27, 2 females, 5 ovigerous females, stn. 29, 3 males, stn. 33, 2 males, 3 females, 1 ovigerous female; stn. 41, 5 males, 1 female, stn. 49, 1 male; stn. 54, 1 female. BIOREPES 1 stn. 12, 2 males, 3 females, 1 ovigerous female; stn. 26, 5 males; stn. 27, 7 males, 3 females; stn. 30, 62 males, 61 females; stn. 31, 5 males, 1 female, 10 ovigerous females. BIOREPES 2 stn. 2, 2 males, 2 females, 1 ovigerous female; stn. 4, 1 ovigerous female; stn. 14, 1 male; stn. 15, 7 males; stn. 18, 1 female, 5 ovigerous females; stn. 34, 1 male, 1 female, 1 ovigerous females. BIOREPES 3 stn. A2, 3 males, 3 females; stn. A10, 1 female; stn. A22, 1 male; stn. A23, 1 ovigerous female; stn. A24, 2 males, 1 female; stn. A25, 1 male; stn. B2, 1 male, 2 females, 1 ovigerous female; stn. B3, 1 male, 2 females; stn. B6, 1 male, 1 female, 1 ovigerous female 1; stn. B7, 5 males, 2 ovigerous females; stn. C2, 1 male, 3 females; stn. C5, 2 males, 4 females, 2 ovigerous females. COBERPES 1 stn. A9, 1 male, 1 female, 1 ovigerous female; stn. B9, 5 males, 4 females, 1 ovigerous female; stn. B14, 1 female, 1 ovigerous female; stn. Ω 2, 11 males, 8 females, 9 ovigerous females; stn. Ω 15, 2 males, 3 females; stn. E4, 1 female. COBERPES 2011 stn. E1, 2 ovigerous females; E7, 4 males. COBERPES 3 stn. α 5, 1female; stn. B10, 2 males, 1 female. COBERPES 4 stn. A1b, females 1; A3, 1 male; stn. B15b, 7 males, 5 females; stn. B26b, 7 males, 7 females; stn. B27, 1 male; stn.C33b, 7 females; stn. C34, 4 males, 2 females.

Additional material examined.

SIGSBEE 9 stn. A4, 8 males, 5 females, 1 ovigerous female, stn. A6, 15 males, 11 females, 5 ovigerous females, stn. A7, 11 males, 1 female, 1 ovigerous female, stn. A9, 11 males, 14 females, 4 ovigerous females. SIGSBEE 10 stn. C, 1 male, stn. D, 4 females, stn. E, 2 females, stn. F, 1 male, 1 ovigerous female.

Remarks.

This species presented a wide distribution in the southern Gulf of Mexico, in Yucatán, off Celestún; Tamaulipas, San Fernando River; Veracruz, Tamiahua Lagoon and Pánuco River; in Tabasco off Grijalva-Usumacinta Rivers; and Quintana Roo, off Holbox Island; from 110.5 to 1140.0 m depth. Agononida longipes was the most common and abundant species of squat lobsters throughout all cruises with 446 individuals. The overall sex ratio was 0.94 M: 1.0 F. The maximum abundance was observed in summer (77.8%; from 309.0 to 1140.0 m) and in the SSW sector (53.4%; 231.6-913.0 m). Ovigerous females (n = 58), exhibited larger mean CLx = 15.328 ± 2.148 (min. 10.7, max. 20.8 mm) than males (n = 216), CLx = 14.253 ± 6.583 (min. 2.0, max. 34.0 mm) and females (n = 172), CLx = 14.048 ± 3.025 (min. 7.61, max. 22.5 mm).

The ANOVA test showed that the mean CL in males, females, and ovigerous females were statistically different among seasons: F (2;207) = 8.48; p = 0.00; F (3;168) = 5.83; p = 0.00; F (2;55) = 6.94; p = 0.00, respectively. The largest sizes were present in spring, whereas the smallest were in summer (Figs 3b, d, e; Tukey Test). However, the mean CL among the depth strata were statistically different only in males and females: F (5;204) = 4.49; p = 0.00; F (3;168) = 5.83; p = 0.00, respectively. The largest males were collected in shallower depths (Fig. 3a), while the largest females were in deeper ones (Fig. 3c). The seasonal sex ratio approached the expected proportion (1 M: 1 F), except in autumn (0.68 M: 1 F), but it was not statistically different ( χ 2 = 1.524, p = 0.2170). Ovigerous females were present in spring, summer, and autumn, and the largest number was collected in summer between 269.0-913.0 m depth. The percentage of bopyrid infestation in each sex was relatively uniform (males = 5.8 and females 4.1). The CL size of parasitized individuals ranged from 1.9 to 15.2 mm in males and 11.1 to 15.4 mm in females.