Tanystylum geminum Stock, 1954
publication ID |
https://doi.org/ 10.11646/zootaxa.2319.1.1 |
DOI |
https://doi.org/10.5281/zenodo.5327914 |
persistent identifier |
https://treatment.plazi.org/id/03E687F8-296E-FF98-7ADC-17C89EE6FEC1 |
treatment provided by |
Felipe |
scientific name |
Tanystylum geminum Stock, 1954 |
status |
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Tanystylum geminum Stock, 1954 View in CoL
Fig. 18–19 View FIGURE 18 View FIGURE 19
Tanystylum geminum Stock, 1954: 120 View in CoL .— Child 1979: 28. Stock: 13. Stock, 1982: 187. Stock 1986: 400. Müller 1990: 279. Müller 1992:45
Material. 19.— 2 fem. (gravid) ( SMF 1404 About SMF ), Thalassia , 5 l of substratum, 0.5–4 m, 27.VI.1985 . 1 fem. (gravid) ( SMF 1405 About SMF ), Thalassia , 5 l of substratum, 5.VII.1985 . 1 fem. (gravid) ( SMF 1406 About SMF ), Thalassia , 5 l of substratum, 9.IX.1985 . 1 male ( SMF 1407 About SMF ), Thalassia , 5 l of substratum, 8.XI.1985 . 2 males, 1 fem., 2 juv. ( SMF 1408 About SMF ), Thalassia , 5 l of substratum, 7.XII.1985 . 1 juv. ( SMF 1410 About SMF ), Thalassia , 5 l of substratum, 12.II.1986 .
24.— 2 males, 1 fem., 2 juv. ( ZMA 3387 View Materials ), Thalassia , 0.5–1 m, 8.XI.1985 . 1 juv. ( SMF 1411 About SMF ), Thalassia with corallinacean algae, 1 m, 21.I.1986 .
32.— 1 male ( SMF 1412 About SMF ), on brown algae (mainly Sargassum ) on rock, mesolittoral, 3.VIII.1985 .
34.— 1 fem. ( SMF 1413 About SMF ), on brown algae, Thalassia and hydroids, 0.5–2 m, 30.VII.1985 .
40.— 1 male (ov.), 5 fem. (gravid) ( SMF 1414 About SMF ), Thalassia , 1–3.5 m, 8.VIII.1985 .
43.— 1 male ( SMF 1415 About SMF ), Thalassia , 1–1.5 m, 25.II.1986 .
Description of male: Dorsal trunk outline circular, crurigers touching along their entire length, smooth and without any setae; all segments fused. Cephalon with two short antero-lateral setae above palp origin. Ocular process broader than high, eyes relatively large and distinctly pigmented. Abdomen relatively short, directed obliquely to the rear, with 4 short setae in its distal part; abdomen surpassing the 4 th crurigers by about 1/4–1/2 of its length. Proboscis relatively long, strongly narrowing in its distal third.
Cheliphores about 1/3 length of proboscis, fused in their median line, distally rounded and bearing 3–4 short setae. Palpus 4-articled, 2 nd article elongated; 4 th article two times as long as 5 th, bearing 6 ventral and 3 terminal spines. Oviger 10-articled; articles 4 and 5 elongated, of nearly equal length and bearing some short spines; articles 6–10 shortened, bearing some short spines.
Legs robust, all articles bearing conspicuously few short spines and setae; coxae 1 of all legs distallydorso-laterally with a few irregularly shaped (partly branched) tubercles with short spines; coxa 2 with some short lateral spines, some mounted on tiny tubercles; coxae 1–3 subequal in length; dorso-distal cement gland on femur forming short and distally narrowing tube; tibia1 and 2 subequal in length, with 2 flat roundish dorsal tubercles; tarsus as long as broad, 4 ventral spines; propodus moderately curved, with indistinct heel; proximal third of sole with 3 strong short spines; sole distally with 3 small spines and about 4 short setae; main claw feebly curved, half as long as propodus; auxiliaries nearly straight, 2/3 length of main claw.
In contrast to the brownish colouration of most other species in this genus, T. geminum in our samples is whitish-yellow.
Measurements: Trunk length 0.47; width (across 2 nd crurigers) 0.50; length of abdomen 0.13; proboscis length 0.34. Leg 3: coxa 1, 0.12; coxa 2, 0.13; coxa 3, 0.13; femur 0.34; tibia 1, 0.28; tibia 2, 0.30; tarsus 0.06; propodus 0.28; main claw 0.14; auxiliary 0.09.
Female: In habitus like male, coxae 1 and 2 of all legs with some short setae distally. Oviger distinctly shorter than in male, in total more sparsely spinose and articles 4–5 more shortened.
Remarks: T. geminum is easily recognizable by its well-developed cheliphores, lack of tubercles and setae on the crurigers, and light colouration in the samples. This species is strikingly similar to Tanystylum bredini Child, 1970 , which is widely distributed in the Indo-Pacific. Distinctly differentiating characters are the shape of the proboscis, which is more robust in T. bredini and distally not so strongly narrowing, and shorter than the palps. Stock’s (1982: 187) material from Somalia, which he considered with some reservation as T. geminum , is comparable to the T. bredini which Müller (1990c: 68, Figs. 7–10 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10 ) reported and figured from Kenya.
T. geminum predominantly colonized Thalassia stands in the research area, although to a lesser degree it was found also in association with algae. The depth range was from the mesolittoral to about 4 m. A single ovigerous female was found in VII only. Mature specimens were found during the course of the entire year except in the months III and X–XI.
Distribution: Atlantic coast of Mexico and Panamá ( Child 1979: 28), Florida and Puerto Rico (Stock 1975a: 983), Barbados ( Müller, 1992), Martinique (Bourdillon 1955: 587; Müller 1990d: 279), Bonaire, Isla Margarita, St. Martin and Jamaica ( Stock 1979: 13).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Tanystylum geminum Stock, 1954
Müller, Hans-Georg & Krapp, Franz 2009 |
Tanystylum geminum
Muller, H. - G. 1992: 45 |
Stock, J. H. 1986: 400 |
Stock, J. H. 1982: 187 |
Child, C. A. 1979: 28 |