Austinixa felipensis ( Glassell, 1935 )

Austinixa felipensis ( Glassell, 1935) View in CoL

Pinnixa felipensi s Glassell, 1935: 14. — Hendrickx, 1993: 314.

Pinnixa salvadorensis Bott, 1955: 48 View in CoL , 59, fig. 3 a–c, pl. 11a, b.

Austinixa felipensis View in CoL . — Palacios Theil et al. 2016: 4, figs. 1–4, tab. 2. — Palacios Theil and Felder 2020a: 126 View Cited Treatment , figs. 10, 11. — Palacios Theil and Felder, 2020b: 88 View Cited Treatment , fig. 1, tab. 1.

Material examined. Isla de la Piedra , Mazatlán, Sinaloa (23°11’12”N 106°24’35”W): 2 males, CW 11.0, CL 4.3 mm ( ICML-EMU 12534 ), intertidal, sand, in burrows of Callichirus seilacheri ( Bott,1955) , 25 February 2009, coll. E. Ríos-Jara and JSB GoogleMaps ; 1 male, CW 11.1, CL 4.3 mm, 1 female CW 11.0, CL 4.3 mm ( ICML-EMU 12535 -A), 19 April 2009, coll. JSB ; 2 males, CW 7.9–8.3, CL 3.0– 3.2 mm, 1 female CW8.0, CL 3.1 mm ( ICML-EMU 12535 -B), 12 August 2010, coll. L. Sauma and JSB ; 1 female, CW 8.4, CL 2.9 mm ( ICML-EMU 12535 - C), 9 September 2010, coll. L. Sauma and JSB ; 3 males CW 5.0–8.0, CL 2.3–3.2 mm, 4 females, CW 6.4–9.1, CL 2.5–3.4 mm, 3 juveniles CW 3.8–4.2, CL 1.6–2.2 mm ( ICML-EMU 12535 - D), 11 November 2018, coll. JSB and MAP . — Santa María - La Reforma , coastal lagoon, Sinaloa: Melendez Island, (24°48’09”N 108°03’26”W), 2 females, CW 15.5–17.3, CL 5.8–6.3 mm ( ICML-EMU 12536 - A), intertidal, sand, unknown host, 15 March 2013, coll. N. Arenas and JSB GoogleMaps ; 2 males, CW 7.8–11.7, CL 2.9–3.9 mm, 1 ovigerous female, CW 11.3, CL 4.2 mm ( ICML-EMU 12536 -B), unknown host, 18 January 2015, coll. N. Suárez and V . Papiol. — El Tambor , (24°44’44”N 107°59’42”W), 9 males CW 6.2–12.2, CL 2.7–4.0 mm, 8 ovigerous females, CW 9.8–12.4, CL 3.6–4.9 mm ( ICML-EMU 12536 -C), intertidal, fine sand, in Neotrypaea sp. burrows, 15 October 2014, coll. A. K. Barragán and N. Arenas. GoogleMaps — Saliaca Island , (25°08’54”N 108°16’14”W), 1 ovigerous female, CW 12.0, CL 4.3 mm ( ICML-EMU 12536 -D), intertidal, fine sand, 30 Mar 2015, coll. JSB GoogleMaps . Bahía Chamela , Jalisco: mouth of Estero de Pérula, (19°35’05”N 105°08’03”W), 1 male, CW 8.9, CL 2.9 mm (LEMA-CCR-187), 0.3 m, sand, 7 March 2013, coll. M.A.P GoogleMaps ; 1 male, CW 9.3, CL 3.0 mm, 1 female CW 6.5, CL 2.6 mm, 1 ovigerous female CW 9.2, CL 3.0 mm (LEMA-CCR-375A), Punta Pérula , (19°35’07”N 105°08’02”W), 0–0.3 m, sand, 28 November 2011, coll. M.A.P and JSB GoogleMaps ; 2 males, CW 9.2, CL 3.0 mm (LEMA-CCR-375B), same data, 29 November 2011, coll. MAP and JSB GoogleMaps . — La Cruz de Huanacaxtle , Nayarit, (20°45’03”N 105°22’38”W), 1 female, CW 5.5, CL 2.1 mm ( ICML-EMU 12891 ), intertidal, fine sand, 22 August 2020, coll. R GoogleMaps . García de Quevedo and ARH .

Distribution. San Felipe, Baja California, Gulf of

California, Mexico to Las Enramadas, Nicaragua

( Glassell, 1935; Boot, 1955; Palacios Theil et al. 2020b).

Remarks. The specimens were collected cohabiting the burrows of calliannassid shrimps, Callichirus seilacheri ( Bott, 1955) and Neotrypaea sp. Currently, the records of this species had been scarce and the known distribution was limited to San Felipe, Baja California, in the upper Gulf of California, Coral de Mulas, El Salvador and Las Enramadas, Nicaragua, in Central America. Austinixa felipensis seems to be a common species on sandy beaches, in the intertidal zone of coastal lagoons or open sea beaches not directly (or poorly) exposed to the waves from the eastern coast of the Gulf of California to the State of Jalisco; however, due to its infaunal habits and the fact that coring devices are not widely used to collect invertebrates, the records of its presence have been scarce. With the records of the presence of this species in four new locations in the Gulf of California and the central Mexican Pacific a continuity of the distribution of this species seems to be confirmed.