Open Access

Porcelain crabs (Crustacea: Decapoda: Anomura) of western coast of India

Marine Biodiversity Records20169:43

https://doi.org/10.1186/s41200-016-0057-y

Received: 4 May 2016

Accepted: 6 June 2016

Published: 22 July 2016

Abstract

Background

Significant works have been done on the diversity and distribution of porcellanids crabs in Indian coasts. The present work reports and describe porcelain crabs from the western coast of India.

Result

Five species of porcelain crabs in three genera are reported from the western coast of India. Morphological descriptions with measurement of the reported species with key characters and distribution status are given.

Conclusion

Petrolisthes boscii (Audouin, 1826), P. lamarckii (Leach, 1820), and P. rufescens (Heller, 1861) are commonly distributed along the studied coast. Enosteoides ornatus (Stimpson, 1858) and Pachycheles tomentosus (Henderson, 1893) sparsely occur and are firstly reported from the Gujarat coast.

Keywords

Crustacea Porcelain crabs Distribution New records West coast India

Background

The anomuran crustacean family Porcellanidae (porcelain crabs or false crabs) can be easily distinguished from brachyura (true crabs) by having the fifth pereopod which is reduced in size and often hidden beneath the carapace, the antennae with an elongate flagellum and the abdomen which does not fit closely to the underside of the cephalothorax (Poore and Ahyong 2004; Osawa and Chan, 2010). The family includes approximately 280 species in 30 genera from tropical to temperate waters of the world (e.g., Osawa and McLaughlin, 2010; Osawa and Uyeno, 2013; Dolorosa and Werding, 2014). Porcelain crabs are mainly inhabitants of intertidal coasts, found beneath humid rocks, dead corals and in muddy bottoms (Werding and Hiller, 2004), while, in sub-tidal region, they occasionally live in association with other invertebrates such as sea urchin, soft corals, worm tubes, sponges and hydrozoans (Werding, 1983; Hiller et al. 2004; Hiller et al. 2006; Osawa and Chan, 2010). These crabs are also well known for their escape tactics in response to the potential predators by voluntary shedding of limbs (Wasson et al. 2002). Significant works have been done on the diversity and distribution of porcellanids in Indian coasts (e.g. Heller 1862, 1865; Henderson 1893; Southwell 1906; Gravely 1927; Sankarankutty 1961a, b, 1963; Sankolli 1966; Mustaquim 1972; Ahmed and Mustaquim 1974; Poupin et al. 2013; Prakash et al. 2013a). Recently, Prakash et al. (2013b) provided an updated checklist of porcellanids with their distribution and ecology in Indian waters, including 30 species in 11 genera. Kumaralingam et al. (2015) subsequently reported one more species Neopetrolisthes spinatus Osawa and Fujita, 2001 from the Andaman Islands as new to the Indian fauna. Additionally, porcelain crabs in the western Indian coast have been also studied by Southwell (1909); Siddiqui and Kazmi (2003); Kazmi and Siddiqui (2006); Hiller et al. (2010); Trivedi and Vachhrajani (2013) and Beleem et al. (2014). In this short report, we report five porcellanid species from Gujarat in the western coast of India. Among them, Enosteoides ornatus (Stimpson, 1858) and Pachycheles tomentosus (Henderson, 1893) are first records for this region.

Methods

Gujarat is situated on the western extreme of Indian subcontinent. The coastline of Gujarat is generally divided into the Gulf of Kutch, Saurahstra coast and the Gulf of Khambhat. In the present study, intertidal zones of eight different locations on Gujarat coast were surveyed for the diversity of porcellanid fauna (Fig. 1). These locations are Diu (20°42'11.52"N, 70°58'34.30"E), Veraval (20°54'48.33"N, 70°20'55.48"E), Chorwad (21°0'5.65"N, 70°13'28.94"E), Mangrol (21°6'54.14"N, 70°5'24.91"E), Dwarka (22°14'32.41"N, 68°57'20.81"E), Mithapur (22°25'11.86"N, 68°59'28.52"E), Okha (22°28'42.60"N, 69° 4'7.55"E) and Narara (22°28'22.20"N, 69°43'21.90"E). Crabs were handpicked and preserved in 10 % formalin. Collected specimens were brought to the laboratory and identified using the identification keys of Henderson (1893); Osawa (2007); Werding and Hiller (2007) and Hiller et al. (2010). Standard vernier callipers and stereo zoom microscope (Carl Zeiss Primo Star) were used to measure the morphometric of specimens. Synonymy of five species treated in this study follows that of Osawa and McLaughlin (2010).
Fig. 1

Map of Studied area

Results and discussions

Five species belonging to three genera were identified and their location sites are shown in Table 1. Three species were previously reported from Saurashtra and Kutch coasts. Other two species are firstly recorded from Gujarat coastline.
Table 1

Occurrence of porcelain crabs along Gujarat coast, India

No.

Scientific name

1

2

3

4

5

6

7

8

1

Enosteoides ornatus

-

-

-

-

-

+

-

+

2

Pachycheles tomentosus

-

+

-

-

-

-

-

-

3

Petrolisthes boscii

+

+

+

-

-

+

+

+

4

Petrolisthes lamarckii

+

+

-

+

+

+

+

+

5

Petrolisthes rufescens

-

-

-

-

-

+

+

+

(First row indicates places: 1-Diu, 2-Veraval, 3-Chorwad, 4-Mangarol, 5-Dwarka, 6-Mithapur, 7-Okha, and 8-Narara)

Systematics

Order DECAPODA Latreille, 1802

Infraorder ANOMURA MacLeay, 1838

Family PORCELLANIDAE Haworth, 1825

Genus Enosteoides Johnson, 1970

  1. 1.
    Enosteoides ornatus (Stimpson, 1858) (Fig. 2a)
    Fig. 2

    Entire animal dorsal view (a) Enosteoides ornatus, female, CL: 06 mm, CW: 5.6 mm. b Pachycheles tomentosus, male, CL: 8.2 mm, CW: 7.5 mm. c Petrolisthes boscii, male, CL: 7.1 mm, CW: 6.9 mm (d) Petrolisthes lamarckii, ovigerous female, CL: 18.3 mm, CW: 15.2 mm (d1) same, carapace branchial region showing epibranchial spine (e) Petrolisthes rufescens, male, CL: 11.2 mm, CW: 9.0 mm (e1) same, carapace branchial region

     

Synonymy

Porcellana ornata Stimpson, 1858; Porcellana corallicola Haswell, 1882.

Material examined

2♀, (1) CL: 6.0 mm, CW: 5.6 mm; (2) CL: 5.3 mm, CW: 4.8 mm.

Description

Carapace as long as broad, front with indistinct lateral lobes and distinct groove on dorsal midline, epibranchial margin unevenly convex, dorsal surface uneven, regions well marked. Chelipeds nearly identical in shape and armature, flattish; merus denticulate with rounded projection at antero-distal edge; carpus denticulate on dorso-anterior margin, dorsal surface with three longitudinal crests, posterior margin with sharp spine at distal end; palm with two rows of tubercles on dorsal surface, anterior margin covered with feathery setae. Ambulatory legs covered with feathery setae; merus unarmed; carpus with one spine at postero-distal end; propodus with one spine at distal end on posterior margin; dactylus with five movable spines on posterior margin.

Colour

In fresh specimens, entirely grey.

Habitat

Found beneath the dead coral rock in lower intertidal zone.

Distribution

Southern India, Mergui Archipelago, Australia, South China Sea, Korea and Japan (Komai, 2000), Goa (Hiller et al. 2010). Presently, it is reported from the Gulf of Kutch, Gujarat (Table 1).

Remarks

This species was previously reported as Porcellana ornata by Gravely (1927) from Krusadai Island in the Gulf of Mannar and by Sankolli (1968) from Ratnagiri coast of India. Recently, Hiller et al. (2010) reported E. ornatus from Goa. This is the first report of E. ornatus from Gujarat coastline.

Genus Pachycheles Stimpson, 1858

  1. 2.

    Pachycheles tomentosus Henderson, 1893 (Fig. 2b)

     

Synonymy

Pachycheles tomentosus Henderson, 1893.

Material examined

1♂, CL: 8.2 mm, CW: 7.5 mm.

Description

Carapace as long as broad; front depressed, covered with setae. Chelipeds unequal in shape but similar in armature; merus with rounded projection on anterodistal edge; carpus convex, densely hairy, and with three longitudinal rows of four or five tubercles on dorsal surface, anterior margin serrated with three blunt teeth; palm flattened on dorsal surface, tuberculate and densely tomentose anteriorly, setae arranged in short tufts; fingers with wide gap when closed, tip of movable finger bent underside tip of immovable finger. Ambulatory legs covered with feathery setae; merus and carpus unarmed; propodus with two small spines at distal end of posterior margin; dactylus with three small spines on posterior margin.

Colour

In fresh specimen, entirely light brown.

Habitat

Mostly seen in lower intertidal zone; preferred rocky substratum with large boulders and small crevices.

Distribution

Western Indian Ocean, Persian Gulf, Gulf of Oman and Pakistan (Siddiqui and Kazmi 2003; Kazmi and Siddiqui, 2006; Naderloo and Türkay, 2012; Naderloo et al. 2013). Presently it is reported from Veraval coast, Gujarat, India.

Remarks

This species was originally described by Henderson (1893) from Karachi, Pakistan, and then has been recorded from different regions in Indian Ocean. We firstly report Pachycheles tomentosus from Gujarat coast.

Genus Petrolisthes Stimpson, 1858

  1. 3.

    Petrolisthes boscii (Audouin, 1826) (Fig. 2c)

     

Synonymy

? Porcellana rugosa White, 1847; Porcellana boscii Audouin, 1826; Petrolisthes rugosus Miers, 1884; Petrolisthes amakusensis Miyake and Nakasone, 1966.

Material examined

1♀, CL: 9.0 mm, CW: 8.3 mm; 2♂, (1) CL: 12.0 mm, CW: 11.9 mm; (2) CL: 7.1 mm, CW: 6.9 mm.

Description

Carapace slightly longer than broad, entirely covered with transverse striae, front slightly depressed, triangular with distinct median groove on dorsal surface; small acute epibranchial spine present at anterior end of cervical groove. Chelipeds almost equal in size and armature, entirely covered with striations; merus with rounded projection at anterodistal edge; carpus with four sharply tipped, broad teeth on anterior margin and with two sharp spines at posterodistal end. Ambulatory legs covered with feathery setae; merus with one spine at posterodistal end in second and third pereopods while unarmed in fourth pereopod carpus of second pereopod with one spine at anterodistal end; propodus with two spines on distal end of posterior margin; dactylus with three movable spines on posterior margin.

Colour

In fresh specimens, generally pinkish red with white striation. This white striation is also observed in preserved specimens.

Habitat

Mostly found in upper intertidal zone; sandy-muddy substratum or under large steady boulders.

Distribution

Indian Ocean, from Red Sea to Mergui Archipelago; Western Pacific from Japan to Malay Archipelago and Australia (Komai, 2000). Presently, reported from different coastal areas of Gujarat, India (Table 1).
  1. 4.

    Petrolisthes lamarckii (Leach, 1820) (Fig. 2d)

     

Synonymy

Pisidia lamarckii Leach, 1820; Porcellana bellis Heller, 1865; Porcellana dentata H. Milne Edwards, 1837; Porcellana pulchripes White, 1847; Porcellana speciosa Dana, 1852.

Material examined

1♀, CL: 18.3 mm, CW: 15.2 mm; 1♂, CL: 14.2 mm, CW: 13.0 mm.

Description

Carapace as long as broad; front slightly depressed, triangular, with distinct groove on dorsal midline; small sharp epibranchial spine present at anterior end of cervical groove (Fig. 2d1). Chelipeds nearly identical in shape and armature, with weak striation on dorsal surface; merus with rounded projection at anterodistal edge; carpus serrated with four to five unequal-sized teeth on dorso-anterior margin; posterior margin terminating in bifid spine; palm broad, anterior margin convex, unarmed. Ambulatory legs covered with feathery setae; merus with one spine at posterodistal end in second and third pereopods, unarmed in fourth pereopods carpus with one spine at anterodistal end in second pereopod but unarmed in third and fourth pereopods; propodus with two spines on distal end of posterior margin; dactylus with three or four movable spines on posterior margin.

Colour

In fresh specimens, generally light brown, carapace with red patches and two orange spots on branchial region, ambulatory legs with distinct white bands on propodi.

Habitat

Mostly found in upper intertidal zone; sandy-muddy substratum with small pebbles or under large steady boulders.

Distribution

Indo-West Pacific, west to eastern African coast (Osawa and Chan 2010), In India, Goa (Hiller et al. 2010), Saurashtra coast (Trivedi and Vachhrajani 2013) and Gulf of Kutch (Beleem et al. 2014). Presently, reported from different coastal areas of Gujarat, India (Table 1).

Remarks

This species is similar to P. rufescens, but immediately distinguished by having an epibranchial spine at the anterior end of the cervical groove (Kropp, 1984; Osawa, 2007; Hiller et al. 2010). Numbers of teeth on the anterior margin of the cheliped carpus are known to vary in P. lamarckii (e.g., Osawa, 2007 and Poupin et al. 2013), while Osawa and Chan (2010) described two morphologically distinct forms based on the armature of the pereopods and shape of rostrum. In view of that our specimens are resemble to the second form of P. lamarckii shown by Osawa and Chan (2010: Fig. 113D-F). Taxonomy of this species also remains complicated (Osawa, 2007; Osawa and Chan, 2010; Poupin et al. 2013).
  1. 5.

    Petrolisthes rufescens (Heller, 1861) (Fig. 2e)

     

Synonymy

Porcellana rufescens Heller, 1861.

Material examined

2♀, (1) CL: 7.7 mm, CW: 6.4 mm; (2) CL: 11.2 mm, CW: 9.0 mm; 2♂, (1) CL: 7.3 mm CW: 6.2 mm; (2) CL: 6.3 mm, CW: 5.8 mm.

Description

Carapace longer than broad; front slightly depressed; no spine at anterior end of the cervical groove (Fig. 2e1). Chelipeds nearly identical in size and armature; merus with rounded projection at anterodistal edge; carpus serrated with three blunt teeth on dorso-anterior margin and small sharp spine at posterodistal end. Ambulatory legs covered with feathery setae; meri and carpi without spines; propodus with four or five spines on posterior margin; dactylus with three movable spine on posterior margin.

Colour

Body entirely dark green or light brown with red patches, chela red with black tips.

Habitat

Lower intertidal zone; beneath rocks, preferred porous rocks.

Distribution

Zanzibar, Mozambique, Red Sea, Persian Gulf (Haig, 1964), Iran (Naderloo and Türkay, 2012), Pakistan and Nicobar Island (Apel, 2001). In India, this species has been recorded only from the Gulf of Kutch by Haig (1964) and Mustaquim (1972), but they gave no descriptions. Presently, reported from Gulf of Kutch, India (Table 1).

Remarks

Petrolisthes rufescens closely resembles P. borradailei Kropp, 1984, but differs in having only a smooth distal projection instead of two sharp spines on the posterior margin of the cheliped carpus (Kropp, 1984). Petrolisthes rufescens is also allied to P. tuerkayi Naderloo and Apel, 2014 in the absence of epibranchial spine, but distinguished by having only a distal spine instead of three or four spines on the posterior margin of the cheliped carpus (Naderloo and Apel, 2014).

Abbreviations

CL, The sizes of specimens are indicated as carapace length; CW, carapace width, in mm

Declarations

Acknowledgement

We are very much thankful to the head, of the Department of Life Sciences, Maharaja Krishnakumarsinhji (Bhavnagar University, Bhavnagar). Authors are also grateful to Dr R S Kundu, (Department of Biosciences, Saurashtra University, Rajkot), for directing research pathway. First author (IB) is thankful to the University Grant Commission for providing financial support as Maulana Azad National Fellowship (MANF scheme). Second Author (PP) is thankful to the University Grant Commission for providing financial support as Basic Science Research fellowship. Authors are thankful to Dr. Masayuki Osawa (Shimane University, Japan), Drs. Alireza Sari and Reza Naderloo (University of Tehran, Iran) for their help and suggestions in identification of porcelain crabs.

Authors’ contributions

IB did the taxonomy of porcelain crabs, IB and PP wrote the manuscript, and BG scrutinized and finalized the manuscript. All authors read and approved the final manuscript.

Authors’ information

IB: M.Sc. Marine Science, Ph.D. Research Scholar (Zoology) at Department of Life Science, MK Bhavnagar University, Bhavnagar, India. PP: M.Sc. Zoology, M.Phil. Zoology, Ph.D. Zoology (Marine Ecology). Teaching Assistant at Department of Marine Science, MK Bhavnagar University, Bhavnagar, India. BG: M.Sc. Zoology, Ph.D. Zoology (Marine Ecology), Assistant Professor at Department of Life Science, MK Bhavnagar University, Bhavnagar, India.

Competing interests

The authors declare that they have no competing interests.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Department of Life Sciences, Maharaja Krishnakumarsinhji Bhavnagar University
(2)
Department of Biosciences, Saurashtra University

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Copyright

© Beleem et al. 2016

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