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New Report of the Hermit Crabs Dardanus Lagopodes

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New Report of the Hermit Crabs Dardanus Lagopodes ISSN 0375-1511 Rec. zool. Surv. India: 113(Part-1): 197-201,2013 NEW REPORT OF THE HERMIT CRABS DARDANUS LAGOPODES (FORSKAL, 1775), PAGURISTES MIYAKEI FOREST & MCLAUGHLIN, 1998 AND ONCOPAGURUS MONSTROSUS (ALCOCK,1894) (CRUSTACEA: DECAPODA: ANOMURA) FROM THE INDIAN COAST R. RESHMI AND A. BIJUKUMAR * Department of Aquatic Biology & Fisheries, University of Kerala, Thiruvananthapuram 695581, Kerala, India *Email: [email protected] INTRODUCTION nonchelate 4th pereopods, unpaired pleopods 3-5 Anomuran crabs are best described by having on left side of abdomen (McLaughlin, 2002). Family an assortment of adult body shapes from lobster­ Parapaguridae is usually deep water hermit crabs. like to crab-like; markedly reduced fifth pereopods, Members of the Genus Oncopagurus is with ocular the articulated or missing eighth thoracic sternite acicles terminating in a single spine, ventral surface and the cephalothorax that is not fused to the of palm of right cheliped without prominently epistome as it is in brachyurans (McLaughlin et al., elevated tuberculate or spinose area medially, 2010). Anomura is represented by six carpus of left cheliped with only dorsodistal spine, superfamilies; Aegloidea, Hippoidea, Lithodoidea, merus of right third pereopod without several Lomisoidea, Paguroidea and Galatheoidea. Super spines on dorsal surface (McLaughlin et al., 2007). family Paguroidea includes hermit crabs and their This paper records the occurrence of three species relatives in the families: Coenobitidae, Diogenidae, of hermit crabs Dardanus lagopodes, Paguristes Paguridae, Parapaguridae, Pylochelidae and miyakei and Oncopagurus monstrosus, for the first Pylojacquesidae. Hermit crabs of the Family time from India. Diogenidae commonly called 'Left-handed SYSTEMATIC ACCOUNT hermits' are among the most diverse group Phylum ARTHROPODA represented by about 20 genera (McLaughlin et al., Subphylum CRUSTACEA 2010). They have antennules with upper rami of Class MALACOSTRACA flagellum terminating in tapered filaments and Order DECAPODA chelipeds equal, sub-equal or unequal with left Family DIOGENIDAE frequently largest (McLaughlin et al., 2007). Among 1. Dardanus Zagopodes (Forskal, 1775) Diogenidae, genus Dardanus has the largest and (Fig lA-lE) most widely distributed species of the marine hermit crabs in tropical waters, with rostrum 1775. Cancer lagopodes Forskal, Descriptiones broadly rounded, ocular acicles subtriangular or Animalium, Avium, Amphibiorum, Piscium, Insectorum, Vermium, p. 93. subquadrate and telson armed with spines or spinules. Dactyls and fixed finger of chelae 1824. Pagurus sanguinolentus Quoy & Gaimard, Voyage corneous tipped and opening obliquely aut~ur du monde, entrepris par ordre du roi, (McLaughlin et al., 2007). Genus Paguristes is with sous Ie ministere et conforment aux instructions 198 Rec. zool. Surv. India de S. Exc. M.le Viconote du Bouchage, secretaire maroon mottled with patches of pale violet; carpi d'etat au department de la marine, execute sur reddish-brown dorsally with purplish-blue patch corvettes de S.M. l'Uranie et la Physicieene, on segments. Setae red with cream tips (Fig lA). pendant Ie. 3, p. 532, pI. 79, fig. 2. Shield longer than broad with rostrum rounded 1836. Pagurus affinis H. Milne Edwards, Annales des and depressed carapace. Ocular peduncles long, Sciences Naturelle Zoologie, Paris. 2, p. 274. slender, sub-cylindrical and broadened distally, 1852. Pagurus euopsis Dana, United States Exploring overreaching both antennal and antennular Expedition, during the years 1838, 1839, 1840, peduncles. Ocular acicle subtriangular or 1841, 1842, under the command of Charles subquadrate with 3-4 spines at distal margin. Wilkes, U.5.N.13, p.452. Antennular peduncle longer than antennal 1861. Pagurus depressus Heller, TeiI. Sitzungs-Berichte peduncle. Antennal acicle overreaching the der Mathematisch-Physikisch Klasse der proximal margin of the ultimate peduncular Kaiserlichen Akademie der Wissenschafte, segment terminating in a single spine and with 3-4 Wien.,44, p. 248. spines mesially (Fig lB). Chelipeds subequal, left 1875. Dardanus hellrii Paul'son,. Izsledovaniya not appreciably longer than right. Upper and outer rakoobraznykh krasnago morya s zametkami surface of palm of left chelae with acute spines (Fig. otnositel'no rakoobraznykh drugikh morei. lC). Right cheliped also with tubercles on upper Chast' 1. Podophthalmata i Edriophthalmata surface of chela. Third pereopod with dactyls and (Cumacea), S.V. Kul'zhenko, Kiev., p. 90, pI. 12, propodus of nearly equal length, dorsal and ventral figs.4,4a-c. margin of each with row of strong corneous-tipped 1923. Dardanus euopsis Maki & Tsuchiya, Monograph spines or tubercles. Dactyls with a median of the decapod crustaceans from Formosa, Dept. longitudinal groove on the lateral face while that of Agriculture Government Research Institute, propodus is weakly concave (Fig ID). Carpi of both Formosa. 3, p. 98, pI. 8, fig. 4. pereopods with a strong dorsodistal spine. 1956. Dardanus sanguinolentus Forest, Bulletin du Chelipeds and ambulatory legs are usually covered Museum national d' Histoire naturelle, 2(25), p. 49 with long, stiff setae all over the segments. Telson 1969. Dardanus lagopodes - Lewinsohn, Zoologische asymmetrical left lobe larger, each lobe with Verhandelingen, 104, p. 32, pI. 2,figs.l, 2. corneous ventrally directed spines (Fig lE). Materials examined: one specimen, female (total Remarks: Dardanus lagopodes is widely 0 length 45.5 mm), collected from Vizhinjam Bay (08 distributed in intertidal to shallow subtidal 22'33" N Lat., 76°15'E long.) from a depth of about regions of East Africa, Seychelles, Mauritius, 15m. Thiruvananthapuram district, Kerala, India. Madagascar, Red Sea, Southern India, Thailand, The reference material is deposited at the Philippines, Malaysia, New Guinea, Australia, Zoological Survey of India (ZSIjWGRC/IR /2117) Taiwan, Japan, Samoa, French Polynesia and museum collections of Department of Aquatic (Gherardi & McLaughlin, 1994; McLaughlin et aI., Biology and Fisheries, University of Kerala (ARAN 2007). The present record of this species from the 9), India. The hermit was collected from the southwest coast of India shows its extended gastropod shell of Tibia insulaechorab curta. distribution in Indian subcontinent. Diagnosis: Carapace mottled with red and 2. Paguristes miyakei Forest & McLaughlin, 1998 white, anterior portion with purplish-red patch. (Fig 2A-2E) Ocular peduncles yellowish-brown with yellow band distally near corneas. Antennal and 1978. Paguristes setosus Miyake, The crustacean antennular peduncles light blue with antennular Anomura of Sagami Bay, p. 27, fig. 8. flagellum orange. Chelipeds mottled red, brown, 1978. Paguristes puniceus Miyake, The crustacean maroon and white; Chelae reddish to maroon on Anomura of Sagami Bay, p. 37, fig. 13. fingers and palm, Carpi red-brown with large 1998. Paguristes miyakei Forest & McLaughlin, Proc. BioI. purplish-blue patch dorsally, meri also red-brown Soc. Wash., 111, p.191,figs. 2,3. and white. Ambulatory legs reddish-brown to RESHMI AND BIJUKUMAR : New Report of the Hermit Crabs Dardanus /agopodes ... 199 Fig. 1A. Dardanus /agopodes (Forskal, 1775) - Entire Fig.1B. Shield and cephalic appendages Fig.1C Left cheliped Fig.1D. Left third pereopod Fig. IE. Telson Fig. 2A. Paguristes miyakei Forest & McLaughlin, 1998 - Entire Fig. 2B. Shield and cephalic appendages Fig. 2C Left cheliped Fig. 2D. Left second pereopod Fig. 2E. Telson Fig. 3A. Oncopagurus monstrosus (Alcock, 1894) - Entire Fig. 3B. Shield and cephalic appendages Fig. 3C Right cheliped Fig. 3D. Telson 200 Rec. zool. Surv. India Materials Examined: Seven specimens, 4 males faces unarmed, ventral margins each with row of (total length 83-86 mm) and 3 female (total length 22-26 small corneous spines; dorsal margins of 52-70 mm) collected from trawl by-catch at propodi and carpi each with 1 or 2 rows of Sakthikulangara harbour (08°30' N lat.; 76° 53.3' E prominent spines, irregular row of small spines long.), Kollam district, Kerala, India. Two on ventral margins (Fig 2D). Dactyls of third voucher specimens are deposited at the pereopod with a row of 24-26 spines on ventral Zoological Survey of India (ZSIjWGRCjIRj face; 7-8 spines on ventral margin of propodi; 2118) and museum collections of Department of carpi each with dorsodistal spine and 1 -2 Aquatic Biology and Fisheries, University of proximal spinules. Telson with a row of small Kerala (AR AN 10, AR AN 11), India. The spines on terminal margin (Fig 2E). specimens occupied the shells of Biplex bozetti, Remarks: Paguristes miyakei is widely Polin ices mamilla, Xenophora corrugata, and distributed in Japan, Taiwan, northern Western Xenophora solaris. Australia, (McLaughlin et aI., 2007). The present Diagnosis: Carapace and basal segment of record of this species from the southwest coast of pereopods dark orange brown; the distal portion India shows its extended distribution from North of pereopods light yellowish-brown. Antennae Pacific Ocean to Indian Ocean. and antennules reddish-brown, ocular peduncles Family PARAPAGURIDAE light yellowish (Fig 2A). Shield longer than broad; rostrum triangular (Fig 2B). Dorsal and anterior 3. Oncopagurus monstrosus (Alcock, 1894) (Fig 3A- 3D) margins of branchiostegites with spinules. Ocular peduncles short, slender; corneas not dilated. 1894. Parapagurus monstrosus Alcock, Annals and Ocular acicles each with simple terminal spine. Magazine ofNatural History, 6(13), p. 243. Corneas overreached by both antennal
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