Tanystylum duospinum Hilton 1939

Tanystylum tubirostrum Stock

Tanystylum tubirostre Stock, 1954a:117–120, figs. 24, 25.—Bourdillon, 1955:600, pl. 3: figs. 2–4.

Tanystylum tubirostrum.—Stock, 1975a:984.—Child, in prep.

MATERIAL EXAMINED.—Mexico Pacific: Gulf of Tehuantepec, Velero III 260–34 (1 with eggs, 1y).

Panama Pacific: Archipiélago de las Perlas, NMNH Sta. 38–1 (1 with eggs). Panama City, NMNH Sta. 25–1 (1 , 3y); STRI Abiėtinaria 1 (1 ovig., 1 ), 3 (1 , 4 , 1y), 4 (1 with eggs), 8 (1 with eggs).

MATERIAL EXAMINED.—Panama Pacific: Canal Zone, NMNH Sta. 28–2 (1 larva). Archipiélago de las Perlas, NMNH Sta. 32 (1 larva).

Panama Caribbean: Galeta Island, Barnard PAN–18 (1y).

Tanystylum mexicanum

MATERIAL EXAMINED.—Mexico Pacific: Gulf of California, coll. Dawson, 18 Feb 1946 (1 , holotype, USNM 170650). Baja California, Velero III Sta. 279–34 (1 , paratype, USNM 170651). Guerrero, Velero III Sta. 264–34 (1y, paratype, USNM 170652).

DESCRIPTION.—Trunk circular, robust, unsegmented. Ocular segment extending beyond circular outline of trunk, armed with dorsolateral setae. Lateral processes crowded, armed with low dorsodistal tubercles with setae on anterior and posterior corners except for 1st lateral processes which have them only on posterior corners. Ocular tubercle a tall cone with a small tubercle about halfway along its posterior surface. Eyes moderately large, unpigmented, near base of ocular tubercle. Abdomen long, reaching distal end of 1st coxa of 4th legs, carried almost horizontally except for upcurved distal 3rd, armed with many short setae. Proboscis broadly egg-shaped in proximal two-thirds, tapering abruptly to tubular tip in distal 3rd. Tip curves ventrally.

Chelifore stumps extremely short, mostly hidden by anterior overhang of cephalic segment, armed with 2 or 3 short setae.

Palps 5-segmented. Third segment longest, armed with several proximal setae and distal fringe of lateral and ventral setae. Fourth segment shortest, with a small ventrodistal elongation bearing a fringe of setae. Terminal segment oval, armed with many ventral and distal setae, none longer than segment diameter.

Oviger (female) typical of genus. Fourth and 5th segments longest, 5th slightly longer than 4th. Terminal 3 segments each armed with 2 large fully denticulate spines having 5 or 6 serrations per side.

Legs robust, armed with groups of short setae on bosses and laterally. First coxa with bulbous dorsodistal tubercle bearing 3 short setae and small anterior and posterior tubercles with setae. Second and 3rd coxae inflated, without tubercles. Femur with a low boss dorsally and ventrally and a bulbous dorsodistal tubercle armed with 6 or 7 distal setae. Femur and tibia 1 equal in length, tibia 2 very slightly longer. Tarsus with single ventral spine surrounded by field of short setae. Propodus well curved, armed with 3 robust heel spines and a field of many short sole setae. Claw well curved, half as long as propodus. Auxiliary claws less than half main claw length.

MEASUREMENTS OF HOLOTYPE (mm).—Trunk length (chelifores to tip of 4th lateral processes), 1.2; trunk width (across 2nd lateral processes), 1.07; proboscis length, 0.89; abdomen length, 0.5; third leg, coxa 1, 0.25; coxa 2, 0.39; coxa 3, 0.39; femur, 1.03; tibia 1, 1.03; tibia 2, 1.07; tarsus, 0.17; propodus, 0.71; claw, 0.36.

DISTRIBUTION.—Known from the type-locality, Isla Patos, Sonora, in the Gulf of California, and from Bahia Santa Maria, Baja California, and Bahía Petatlán, Guerrero, Mexico. The holotype's collecting depth is unknown, but probably subtidal. The other recorded depths are 18 and 46 meters, respectively.

ETYMOLOGY.—The species is named for its country of origin.

Tanystylum oculospinosum Hilton

Tanystylum oculospinosum Hilton, 1942e:70.—Child and Hedgpeth, 1971:619–623, fig. 5

Tanystylum oculospinum [sic].—Stock, 1954a:122 [text]; 1955:248–249 [text]; 1966:390 [text].

MATERIAL EXAMINED.—Mexico Pacific: Baja California, Misc. Sta., 2 Sep 1938 (1 , Hilton's holotype, USNM 81518); Barnard PAZ–18 (1 , 1 ), PAZ–21 (1 ), PAZ–22 (1 , 1y).

Tanystylum oculospinosum Hilton

Tanystylum oculospinosum Hilton, 1942:70.—Child, 1979:34 [literature].

Tanystylum tubirostre Stock, 1954:117–120, figs. 24, 25.

Tanystylum tubirostrum.—Stock, 1975:984.—Child, 1979:34–35 [literature]; 1982:363. [New synonymy.]

?Tanystylum mexicanum Child, 1979:32–34, fig. 11. [New synonymy.]

MATERIAL EXAMINED.—ECUADOR. Bahia de Santa Elena, 02°13′09″S, 80°54′38″W, 3 m, sta 16–6671, 8 May 1966, 200+ specimens.

GALAPAGOS ISLANDS. Isla Wenman: 01°22′S, 91°49′W, intertidal rocks, coll. Velero III, sta 144-34, 11 Jan 1934, 2, 2 juv. Isla Baltra: W side, 00°25′55″S, 90°17′25″W, sta unknown, 14 May 1966, 1, 1. Isla Santa Cruz: Bahia Academy, 00°45′11″S, 90°18′15″W, 8–10 m, sta 16-66112, 19 May 1966, 2, 6, 2 juv. Isla Isabela: Point 3 km NW of Tagus Cove, 00°14′27″S, 91°23′22″W, 0–7 m, sta 16-66134, 24 May 1966, 1 with eggs, 1 [returned to Museum of Comparative Zoology, Harvard University]; Canal Bolivar, Punta Tortuga, intertidal rocks, sta 16-66137, 24 May 1966, 1 juv [returned to M.C.Z.]; Tagus Cove, intertidal algal mat, 00°12′S, 91°23′W, coll. D. Hope, sta 9, Feb 1978, 1, 1 juv; Caleta Iguana, 00°57′S, 91°28′W, 6 m, coll. D. Hope, sta 13, Feb 1978, 1 with eggs, 2. Isla Fernandina: 00°15′43″S, 91°26′38″W, intertidal, sta 16-66141, 25 May 1966, 1, 1; same locality and date, depth unknown, sta 16-66142, 3, 1, 2 juv. Nameless small island near Isla Santa Cruz, intertidal rocks, coll. D. Hope, sta 26A, 22 Feb 1978, 1, 1, 1 juv.

PERU. ISLAS LOBOS DE AFUERA: Main isle W of light, shore rocks, 06°57′S, 80°42′W, coll. Velero III, sta 391-35, 17 Jan 1935, 1, 1, 1 juv.

DISTRIBUTION.—This species (as T. oculospinosum) has been recorded in several places in Baja California, Mexico, and the Galapagos Islands, and (as T. tubirostrum) on the Pacific coast of Mexico and Panama, and from Stock's type specimens in the Netherlands West Indies, and finally from Bermuda, all in shallow and littoral depths.

If this species includes T. mexicanum, as suspected, then it is also known from several localities along the Pacific coast of middle Mexico in subtidal depths.

Its distribution is extended by these collections to the Peru and Ecuador coasts to as far as almost 07°S with depths recorded of 0–10 meters.

coastal