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Two Interesting Crabs from Hawaiii

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Two Interesting Crabs from Hawaiii Pacific Science (1977), Vol. 31, No.1, p. 31-38 Printed in Great Britain Two Interesting Crabs from Hawaii I MASATSUNE TAKEDA2 ABSTRACT: Crabs of the family Dynomenidae from precious coral beds off Oahu, Hawaiian Islands, are described as Dynomene devanryi sp. nov. The species is characterized by the velvetlike tomentum without long hairs, some transverse grooves on the dorsum and obtuse anterolateral teeth of the carapace, and the stout and nongranulated ambulatory legs. Another species from the same habitat is Cancer (Platepistoma) macrophthalmus (Rathbun, 1906) of the Cancridae. The recently erected subgenus Glebocarcinus is reduced to a synonym of Platepistoma, which hitherto has been known as a genus distinct from Cancer. By THE COURTESY ofDr. Dennis M. Devaney of Material Examined the Bernice P. Bishop Museum, Honolulu, I had Southeastern Oahu, off Makapuu Point, an opportunity to examine several specimens of Kaiwi Channel, 200 fm, collected by the sub­ crabs collected from coral beds off Oahu, mersible Star II from precious coral (Corallium) Hawaiian Islands, at a depth of about 200 fm. beds. One male (holotype, Figure 2), one female They were tentatively identified by Miss Janet (allotype, Figure 3A), BPBM 1974.04 (lot no. 3); Haig of the Allan Hancock Foundation, Uni­ breadth of carapace 21.3 and 15.7 mm, and versity of Southern California, as Dynomene and length of carapace in median line 20.2 and by Dr. Devaney as a cancroid crab, and a close 15.4 mm, respectively. One male (paratype), left examination revealed that these preliminary cheliped and first two ambulatory legs missing, identifications were correct. This Hawaiian BPBM 1974.04 (lot no. 4), NSMT Cr. 5075; breadth species of the family Dynomenidae is readily 21.0 mm, length 20.0 mm. One male (paratype, distinguishable from the known species of Figure 3B), BPBM 1975.77 (lot no. 2); abdomen Dynomene and is designated as Dynomene de­ somewhat damaged, and merus of left reduced vanryi. Another species that is referred in this leg broken; breadth 22.7 mm, length 21.6 mm. work to Cancer of the family Cancridae was of great significance in the consideration of the systematic status of Platepistoma based on'a Descr~ption young form from Hawaii. Entire surfaces of carapace, chelipeds, and The specimens dealt with here have been ambulatory legs thickly covered with velvetlike deposited in the Bernice P. Bishop Museum, tomentum except for distal parts of fingers; Honolulu, except for one ofthe paratypes ofthe sparse longish silky hairs restricted near new species, which is deposited in the National terminal claws of ambulatory legs; otherwise Science Museum, Tokyo. tomentum quite short and close-set. Carapace nearly as wide as long but seemingly rather FAMILY DYNOMENIDAE quadrate longitudinally. Dorsum flattish and only slightly declivous anteriorly and antero­ Genus Dynomene Desmarest, 1825 laterally, being marked with some prominent Dynomene devaneyi sp. nov. grooves and depressions as shown in photo­ graphs; these grooves and depressions give Figures 1-3 dorsum a wrinkled appearance. Front nearly triangular and medially interrupted by a shallow dorsal groove. Orbit deep with dorsal I Manuscript received 12 February 1976. Z National Science Museum, Department ofZoology, inclination; infraorbital region more or less Shinjuku, Tokyo 160, Japan. knobbed, being separated from first antero- 3 31 HPS 31 32 PACIFIC SCIENCE, Volume 31, January 1977 B s s A c FIGURE 1. Dynomene devaneyi sp. nov., holotype. A, left first pleopod in sternal view; B, left first pleopod in abdominal view; C, left second pleopod in abdominal view. lateral lobe and pterygostomial region by a grooves running inward; first lobe curved to­ shallow groove. ward infraorbital region, and second nearly Lateral border of carapace only weakly longitudinal and as long as first; last part arched and separated into three parts by two inclined, and posterior two-thirds weakly con­ distinct interruptions, from which transverse cave dorsally for reception of reduced last leg. FIGURE 2. Dynomene devaneyi sp. nov., holotype. FIGURE 3. Dynontene devane.J!i sp. nov. A, allotype; B, paratype. Two Interesting Crabs from Hawaii-TAKEDA 35 . Chelipeds massive and equal insize and shape; TABLE 1 tn smaller specimens upper border of merus more or less roughened by a series of micro­ DESCRIBED SPECIES AND SUBSPECIES OF Dynomene scopical granules; outer surface of carpus divided into three parts by a subdistal transverse D. hispida Desmarest, 1825 D. latreillii Eydoux & Souleyet, 1842 and a longitudinal groove; surface of inner (= D. hispida,jide A. Milne Edwards, 1879) part rather uneven; palm bulged strongly in D. ursula Stimpson, 1860 large specimens and weakly insmaller ones, with D. depressa (Brocchi, 1875) (as Platydromia, longish tomentum on inner surface; two or ? = D. hispida,jide Takeda, 1973) D. praedator A. Milne Edwards, 1879 three granules traceable on its upper border D. pugnatrix de Man, 1889 near articulation with carpus. Fingers nearly D. pilumnoides Alcock, 1899 meet along their whole length; only in largest D. spinosa Rathbun, 1911 specimen is a narrow gape formed at their bases. D. pugnatrix brevimana Rathbun, 1911 Ambulatory legs markedly stout; all three D. actaeiformis (Stebbing, 1921) (as Maxillothrix, = D. hispida orpilumnoides, jide Barnard, 1950) pairs nearly equal in shape, length, and thiclc­ D. tanensis Yokoya, 1933 ness; upper borders of meri, carpi, and propodi fringed with microscopical granules; surface of merus with a subterminal transverse furrow and carpus with longitudinal furrow no~ close to D. tanensis from southern Japan, which reaching its distal border. In natural position is known only by the poor figure and short reduced last leg not reached by subterminal description. This Japanese species is without furrow of merus of last ambulatory leg; doubt closely related to D. praedator, which is dactylus microscopic with a minute claw, being widely distributed in the Indo-West-Pacific entirely disguised by a longish tomentum. Male waters from the Ryukyu Islands through the abdomen widening distally, while female Micronesian and Polynesian islands to South abdomen with nearly parallel lateral borders; Africa. Though the type specimen of D. tanensis terminal segment large and slightly exceeding is not available, I believe that its carapace may be two times as long as penultimate segment. Male narrower, the regions of the dorsum marked by first pleopod bearing a spatulate distal out­ some transverse grooves, and the ambulatory growth and second pleopod with a probable legs not granulated. Due to these features, the vestige ofexopod. new species is also distinguished from D. prae­ dator, but the carapace is more narrow, the lateral borderofthe carapace is not at all dentate, and the ambulatory legs are much stouter. Remarks The new species is named after Dr. Dennis M. Devaney, to whom my cordial thanks must be The allotype and paratypes agree closely with tendered. the holotype, and the differences are found only in the comparative development of the palm. So far as I know, the following species and subspecies enumerated in chronological order FAMILY CANCRIDAE have been described to date. However, the Genus Cancer Linnaeus, 1758 validity and synonymity of some species must be confirmed byfurther studies on theadditional Subgenus Platepistoma Rathbun, 19°6, material, since most of the Dynomene species are stat. nov. rather poorly known, in spite of their long Cancer (Platepistoma) macrophthalmus history. Only Dynomene ursula is known from the (Rathbun, 19°6), comb. nov. East Pacific-from the west coast of Mexico to Figure 4B the Galapagos Islands; the others are the inhabitants of Indo-West-Pacific waters (Table Platepistoma macrophthalmum Rathbun, 1906, 1). p. 876, fig. 33; north coast ofMaui, Hawaiian The new species described in this paper is Islands, 238-253 fm. FIGURE 4. A, Cancer (Platepistoma) sakaii Takeda & Miyake; B, Cancer (P.) macrophthalmus (Rathbun). Two Interesting Crabs from Hawaii-TAKEDA 37 Material Examined spines that alternate with four small ones. Cancroid crabs, however, are generally variable Southeastern Oahu, off Makapuu Point, Kaiwi Channel, 200 fm, collected by the sub­ with growth, as Rathbun showed in 1930 when she made the keys both to the adult and the mersible Star II from precious coral (Corallium) young specimens of the American species. beds. One female, damaged, BPBM 1974.04 (lot no. 1); breadth with lateral teeth 24.7 mm. One The slender anterolateral spines with broad bases were considered to be one of the generic ovigerous female, with several barnacles on features in the establishment of Platepistoma, carapace, BPBM 1974.04 (lot no. 4); breadth but, as briefly mentioned above, they may be 43.4 mm, length in median line 33.0 mm. One characteristic of the young forms. The other female (Figure 4B), without abdomen; breadth features essential for the genus in question are 39.6 mm, length 30.0 mm, and one female, concerned with the formation of the frontal without carapace, BPBM 1975.77 (lot no. 2). region and buccal area. The front was originally described as being tridentate with the median Remarks tooth triangular and bent down to the inter­ At first sight, these specimens seem to be very antennular septum. It is true that in the adult at close to a Japanese species, originally described hand the median tooth is somewhat ventrally as Platepistoma anaglyptum, subsequently trans­ situated, and the ventral surface of each lateral ferred to Cancer by Sakai (1965), and renamed by tooth is deeply excavated to form the antennular Takeda and Miyake (1972) as Cancer sakaii. The fossa. In Cancer the frontal teeth are usually con­ Japanese species is known from Sagami Bay and fluent with each other from side to side and the Tosa Bay from 85 to 120 m; in the National antennular fossae are shallow, so that the inter­ Science Museum, Tokyo, are one dry male antennular septum is only poorly developed.
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