Garthambrus stellatus (Rathbun, 1906)

Mclay, Colin L., 2009, Revision of the crab genus Garthambrus Ng, 1996, with the description of two new genera and discussion of the status of Tutankhamen Rathbun, 1925 (Crustacea: Brachyura: Parthenopidae), Zootaxa 2122, pp. 1-50 : 20-22

Garthambrus stellatus (Rathbun, 1906)

( Figs 7 C, D, 13B)

Parthenope (Platylambrus) stellata Rathbun, 1906: 884 (part), pl. 15, figs 1, 2. – Garth 1993: 786, figs 3, 4. Parthenope (Platylambrus) stellatus — Serène 1968: 60.

Parthenope stellata — Garth & Davie 1995: 225, fig. 2B.

Garthambrus stellata — Ng, 1996: 158. – Ng & Tan 1999: 122, figs 1A–D, 6A–C; Tan et al. 1999: 199, figs 5, 13d. Garthambrus stellatus — Ng et al., 2008: 130 (list).

Not Parthenope (Platylambrus) stellata Rathbun, 1906 — Edmondson 1951: 213, fig. 18 [= Pseudolambrus calappoides (Adams & White, 1849) ].

Type material. HOLOTYPE: 1 male 48.6 x 32.8 mm ( USNM 29839), Hawaiian Is, south coast of Oahu, 435–461 m, RV Albatross, stn 3811, 27 Mar 1902.

PARATYPE: male 32.9 x 23.1mm ( USNM 29840), Hawaiian Is, Albatross, stn 4045, Hawaii, Kawaihae, 20º01'45"N, 155º54'15"W, 269–362 m, 8 hemp tangles gear, 11 Jul 1902.

Material examined. Philippines. Bohol, Panglao I., off Panglao town, Balicasag I., 50–500 m, in tangle nets, 28 Nov 2001: 1 male 45.9 x 31.3 mm ( ZRC).

Taiwan. Nangfangau, Ilan County, 150 m, trawler, coll. J.-F. Huang, 17 Dec 1991: 1 ovig. female 29.8 x 20.3 mm ( NKIMT).

New Caledonia. BIOCAL: stn DW66, 24º5’S, 168º22’E, 505–515 m, 3 Sep 1985: 1 female 6.4 x 5.4 mm (MNHN).

MUSORSTOM IV: stn 215, 22º55.7’S, 167º17.0’E, 485–520 m, 29 Sep 1985: 1 male 14.5 x 10.7 mm (MNHN).

CHALCAL II: stn DW74, 24º40.36’S, 168º38.38’E, 450 m, 29 Oct 1986: 1 male 17.0 x 12.7 mm (MNHN). – Stn DW75, 24º39.31’S, 168º39.67’E, 600 m, 29 Oct 1986: 1 male 11.6 x 9.3 mm, 1 female 13.2 x 10.4 mm (MNHN).

SMIB 3: stn 13, 23º37.5’S, 167º41.6’E, 448 m, 25 May 1987: 1 male 21.6 x 16.0 mm (MNHN).

AZTEQUE: stn 6, 23º37950’S, 167º42.50’E, 425–470 m, 14 Feb 1990: 1 male 24.9 x 18.7 mm, 1 female 32.3 x 22.9 mm (MNHN).

BERYX 11: stn CP07, 24º55’S, 168º21’E, 510–550 m, 15 Oct 1992: 1 female 14.0 x 9.9 mm (MNHN).

SMIB 8: stn DW167, 23º38.1’S, 168º43.1’E, 430–452 m, 29 Jan 1993: 1 female 45.6 x 32.2 mm (MNHN). – Stn DW169, 23º37.7’S, 167º42.5’E, 447–450 m, 29 Jan 1993: 1 female 46.0 x 32.2 mm (MNHN). – Stn DW187, 23º17.7’S, 168º05.6’E, 390–540 m, 31 Jan 1993: 1 female 30.7 x 21.1 mm (MNHN).

BATHUS 3: stn CP811, 23º41.42’S, 168º15.50’E, 283–408 m, 28 Nov 1993: 1 female 51.8 x 35.1 mm (MNHN). – Stn DW830, 23º20’S, 168º01’E, 316–365 m, 29 Nov 1993: 1 female 9.2 x 7.3 mm (MNHN). – Stn DW 838, 23º01’S, 166º56’E, 400–402 m, 30 Nov 1993: 1 female, 20.7 x 14.0 mm.

BATHUS 4, stn CP928, 18º54.72’S, 163º23.73’E, 452– 420 m, 7 Aug 1994: 1 ovig. female 35.5 x 26.6 mm (MNHN). – Stn DW929, 18º51.55’S, 163º23.27’E, 502–516 m, 7 Aug 1994: 1 male 20.0 x 14.1 mm, 1 female 18.6 x 14.1 mm (MNHN).

MUSORSTOM 6: Loyalty Is, stn DW410, 20º38.50’S, 167º6.65’E, 490 m, 15 Feb 1989: 1 female 47.6 x 31.3 mm (MNHN).

Vanuatu. MUSORSTOM 8: stn DW 986, 19º20.57’S, 169º31.48’E, 602–648 m, 23 Sep 1994: 1 female 7.8 x 6.6 mm (MNHN-B31875).

French Polynesia. Tuamotu Archipelago. Mururoa: stn D14, 21º05.45’S, 139º02.50’W, 319 m, SMCB coll., 24 May 1990: 1 male 62.1 x 41.0 mm (MNHN MP B-22426).

Marquesas Islands. MUSORSTOM 9: Ua Pou, stn DW1148, 9º18.9’S, 140º06.3’W, 300 m, 22 Aug 1997: 1 female 9.8 x 7.9 mm (MNHN-B31876); Mutu One, Hatutaa, stn CP1282, 7º51.7’S, 140º30.6’W, 416–460 m, 7 Sep 1997: 1 female 52.6 x 35.7 mm (MNHN-B31877); Nuku Hiva I., stn CP1306, 8º55.2'S, 140º14.8'W, 283–448 m, 10 Sep 1997: 1 male 58.0 x 39.1 mm (MNHN-B31878).

Hawaiian Islands. Oahu, off Pearl Harbour, dredge spoil site, found on sediment bottom in vicinity of outcrop, Hurl Makalii Dive, stn 82–105, 200 fms (366 m), D. M. Devaney & B. Bartko coll., 1 Sep 1982: 1 male 69.2 x 45.6 mm (ZRC 1997.441).

Diagnosis. Carapace dorsal surface tuberculate, tubercles paxilliform to stellate, without lacunae; supraorbital region not spinose. Tubercles on protogastric, mesogastric, epibranchial, mesobranchial and cardiac regions not fusing together to form smooth ridges or plates. Frontal projection short, less than one quarter length of carapace. Epibranchial margin teeth with sharp tips. Mesobranchial margin without raised, smooth, triangular patch. Sub-orbital spine produced, spine tip extending beyond anterior outer corner of antennal article. 2 Sub-branchial region densely tuberculate. Cheliped merus and carpus outer margins dentate, teeth tips sharp. Upper margins of P5 merus, carpus and propodus spinose; posterior surface of merus, carpus and propodus spinose.

Distribution. French Polynesia, Hawaiian Is and for the first time Vanuatu, Philippines and Taiwan.

Remarks. The only species of Garthambrus that G. stellatus bears some resemblance to are G. poupini , G. allisoni and G. c i d a r i s but in these species the density of tubercles is much lower and their CW/CL ratio is smaller. G. stellatus is also similar to Hispidolambrus mironovi in having spinose ambulatory legs, a character which is not found in other Garthambrus species, but it can be differentiated from H. mironovi by not having a spinose carapace surface. In addition, G. stellatus is now known only from the western Pacific Ocean, whereas H. mironovi appears to be restricted to the eastern Pacific Ocean. Variation in G. stellatus has been discussed in some detail by Ng & Tan (1999).

Edmondson (1951) examined two specimens from the Hawaiian Is (BPBM S 5508) and identified them as belonging to this species, however, examination of these specimens shows that they belong instead to Pseudolambrus calappoides (Adams & White, 1849) . Their lateral teeth are placed much more posteriorly than G. s t e l l a t u s, about in the same line as the posterior margin and are more lobate. In addition, the teeth on the cheliped outer margins are less sharp than in G. stellatus . The spines on the ambulatory legs are finer, more numerous, and the base of the spines are also not as broad as those seen in G. stellatus . The group of ‘stellate tubercles’ depicted by Edmondson (1951: Fig. 18 b), is definitely not stellate but granular.

Figures

FIGURE 7. Gonopods. Garthambrus pteromerus (Ortmann, 1893): A, B, male 31.8 x 19.9 mm (USNM 120717), Japan, Buno Straits, Shikoku I. — Garthambrus stellatus (Rathbun, 1906): C, D, holotype, male 48.6 x 32.8 mm (USNM 29839), Hawaiian Is, south coast, Oahu. A, C, left G 1; B, D, left G 2. Scale bar = 1 mm.

FIGURE 18. Gonopods. Zarenkolambrus minutus sp. nov.: A, B, holotype male 6.2 x 5.1 mm (MNHN), French Polynesia, Austral Is, Raevavae, SMCB, stn D 66, 23 ° 50.54 ʹS 147 ° 42.73 ʹW, 400 m, 3 Dec. 1990 (scale bar = 1 mm). — Zarenkolambrus epibranchialis (Zarenkov, 1990): C, D, male CL 5.0 mm, eastern Pacific Ocean, near Sala y Gómez, Ignolnaya, RV Professor Stockman, stn 2007, 6 – 7 May 1987 (after Zarenkov 1990: fig. 10) (scale bar not available). A left G 1, B, left G 2; C, right G 1; D, right G 2.