Anoplodactylus guachaquitae, Müller & Krapp, 2009

Müller, Hans-Georg & Krapp, Franz, 2009, The pycnogonid fauna (Pycnogonida, Arthropoda) of the Tayrona National Park and adjoining areas on the Caribbean coast of Colombia 2319, Zootaxa 2319 (1), pp. 1-138 : 97-99

Anoplodactylus guachaquitae n.sp.

Figs. 51–52

Material: Holotype: 42.—Male ( SMF 1158 ), coral rubble, 13 m, 28.II.1986.

Paratypes: 1 male without legs, 1 fem. ( SMF 1159 ), together with holotype .

Etymology: After the type locality, Bahía Guachaquita in Tayrona National Park.

Description of male holotype: Trunk rather robust, in dorsal view oval, segments 3 and 4 fused. Crurigers separated by about 1/2 of their diameter, with lappet-shaped dorso-median tubercles and 1–2 short setae. Ocular process coniform with a short distal tip and distinctly pigmented eyes. Abdomen erect, higher than ocular process, distally with 4 short setae. Proboscis robust, cylindrical, 2.5 times as long as diameter.

Cheliphore slender; scape with scattered short setae, barely longer than proboscis; chela slender, with slender, moderately curved and untoothed fingers; 2 short setae at base of immovable finger and on basal half of movable finger. Oviger 6-articled, slender except for proximal two; third article by far the longest, 1.4 times as long as first and second together; 4 th article almost double length of fifth and sixth together; terminal article oval, armed with 3 setae directed proximally; fifth article with about 9 setae which are also curved proximally.

Legs moderately robust and with scattered setae; coxae 1 of all legs with 2 paired dorso-lateral tubercles, each with distal seta, the distal tubercle larger; coxa 2 longer than coxae 1 or 3, on leg 3 and 4 with a slender ventro-distal genital process; coxa 3 slightly longer than coxa 1; femur the longest and most robust article, dorso-distally with an oval tubercle with a slender spine on top, this tubercle is accompanied on both sides by a tiny tubercle with a seta on top; cement gland duct in dorsomedian position on proximal half of femur, robust, distally smoothly rising and ending in relatively broad pore; tibae 1 and 2 of equal length, slightly more setose than femur, with a longer dorso-distal seta, on tibia 2 slightly more proximally positioned; tarsus as long as broad, with 6 ventral setae; propodus rather slender, bearing two robust and 3 more slender spines on distinct heel; sole nearly straight, 6 spines curved distally and some short setae; distal cutting lamella of ca. 1/7 propodus length; terminal claw robust and feebly curved, its tip reaching to proximal spine on sole; auxiliary claw extremely small, 1/7 length of main claw.

Measurements: Trunk length 1.15; width 0.78 (across first crurigers); length of abdomen 0.27; length of proboscis 0.46, length of cheliphore scape 0.43; length of chela 0.18. Lengths of articles of leg 3: coxa 1— 0.18; coxa 2—0.45; coxa 3—0.24; femur 0.78; tibia 1, 0.73; tibia 2, 0.73; tarsus 0.09; propodus 0.38; main claw 0.23; auxiliary claw 0.03.

Female: The single female specimen of 0.76 total length is much smaller than male. Humps on coxa 1 of legs not developed; femur enlarged to hold ova; tibia 1 slightly longer than tibia 2; sole of propodus without spines, with a long cutting lamella, flanked on both sides with several setae.

Remarks: A. guachaquitae n.sp. and A.reimerae Child, 1979 from the Pacific coast of Panamá are sibling species. We presume that the speciation happened through isolation after the rise of the Panamanian ishthmus in Pliocene. A. reimerae is distinct from the new species by a combination of the following characters: ocular process nearly conical, without a constricted tip; chela distinctly more setose; distal article of oviger more robust; of the dorsal tubercles on coxae 1 the distal one shorter than in A. guachaquitae ; cement gland ducts clearly different, originating obliquely on the femur, its anterior margin not dorsally bent (compare Fig. 51 with Child 1979: 59, Fig. 20 ).

Distribution: Caribbean coast of Colombia.

Figures

FIGURE 20. Tanystylum hummelincki Stock, 1954: A male dorsal, B male lateral, C female dorsal, D male palp, E female oviger, F male oviger.

FIGURE 51. Anoplodactylus guachaquitae n. sp., male: A trunk dorsal, B trunk lateral, C chela, D distal three articles of oviger, E leg 3, F propodus and tarsus of leg 3, G cement gland duct. Anoplodactylus reimerae Child, 1979: H, cement gland duct for comparison.

FIGURE 52. Anoplodactylus guachaquitae n. sp., female: A leg 3, B propodus and tarsus.