Redescription of the shallow water calappid <i>Mursia spiridonovi</i> Karasawa, 2018 (Brachyura: Calappidae) from India

Mursia spiridonovi Karasawa, 2018 known only from the western Indian Ocean, is the smallest species of the genus, measuring only 18 mm in carapace length. The species is redescribed from fresh material collected in Tamil Nadu in southern India. It is compared with similarly sized specimens of M. bicristimana Alcock and Anderson, 1894, all of which are immature. Mursia spiridonovi is characterised not only by its occurrence in shallow waters (less than 300 m depth) and small adult size but also by the prominently granular carapace and structure of the cheliped merus, male pleonal somites and gonopods.

Keywords:
Taxonomy; India; Lakshadweep; Gulf of Aden; Indian Ocean; Calappidae; redescription

Authorship

Suvarna S. Devi

Department of Aquatic Biology & Fisheries, University of Kerala. Kariavattom, Thiruvananthapuram - 695581, Kerala, India. University of KeralaIndiaThiruvananthapuram, Kerala, IndiaDepartment of Aquatic Biology & Fisheries, University of Kerala. Kariavattom, Thiruvananthapuram - 695581, Kerala, India.

http://orcid.org/0000-0001-9794-737X

Appukuttannair Biju Kumar

http://orcid.org/0000-0001-5477-2119

Peter K. L. Ng

Lee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore. 2 Conservatory Drive, Singapore 117377, Republic of Singapore.National University of SingaporeRepublic of SingaporeSingapore, Republic of SingaporeLee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore. 2 Conservatory Drive, Singapore 117377, Republic of Singapore.

http://orcid.org/0000-0001-5946-0608

Corresponding author:
Suvarna S. Devi Suvarnaraja1995@gmail.com

SSD
E-mail: Suvarnaraja1995@gmail.com

ABK
E-mail: bijupuzhayoram@gmail.com

PKLN

E-mail: peterng@nus.edu.sg

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (4)

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Figure 1.
Mursia spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., color in life. A-E, male (23.9 ( 14.6 mm) (ZRC 2019.0492); F, ovigerous female (28.4 x 18.1 mm) (DABFUK). A, overall dorsal view; B, F, thoracic sternum and pleon; C, frontal view of cephalothorax and chelae; D, outer view of chelae; E, inner surface of right chela. Photographs: Chan T.-Y., P. K. L. Ng, Suvarna S. Devi.

Thumbnail

Figure 2.
A-D, Mursia bicristimanaAlcock and Anderson, 1894Alcock, A. and Anderson, A.R.S. 1894. An account of a recent collection of deep sea Crustacea from the Bay of Bengal and Laccadive Sea. Natural history notes from H.M. Indian Marine Survey Steamer “Investigator”. Series II, No. 14. Journal of the Asiatic Society of Bengal, 63: 141-185., young male (37.2 ( 19.6 mm) (ZRC 2017.0134), E-H, M. spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., male (23.9 ( 14.6 mm) (ZRC 2019.0492). A, E, overall dorsal view; B, F, dorsal view of carapace; C, G, dorsal view of right distal margin of merus of right cheliped; D, H, posterior carapace margin and right fourth ambulatory leg.

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Figure 3.
A-D, Mursia bicristimanaAlcock and Anderson, 1894Alcock, A. and Anderson, A.R.S. 1894. An account of a recent collection of deep sea Crustacea from the Bay of Bengal and Laccadive Sea. Natural history notes from H.M. Indian Marine Survey Steamer “Investigator”. Series II, No. 14. Journal of the Asiatic Society of Bengal, 63: 141-185., young male (37.2 ( 19.6 mm) (ZRC 2017.0134); E-H, M. spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., male (23.9 ( 14.6 mm) (ZRC 2019.0492). A, E, outer view of left chela; B, F, subventral view of left chela; C, G, pleon; D, H, pleonal somites 2 and 3.

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Figure 4.
A-G, Mursia bicristimanaAlcock and Anderson, 1894Alcock, A. and Anderson, A.R.S. 1894. An account of a recent collection of deep sea Crustacea from the Bay of Bengal and Laccadive Sea. Natural history notes from H.M. Indian Marine Survey Steamer “Investigator”. Series II, No. 14. Journal of the Asiatic Society of Bengal, 63: 141-185., young male (37.2 ( 19.6 mm) (ZRC 2017.0134); H-N, M. spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., male (23.9 ( 14.6 mm) (ZRC 2019.0492). A, H, left G1 (ventral view); B, I, distal part of left G1 (ventral view); C, J, distal part of left G1 (dorsal view); D, K, left G2 (ventral view); E, L, distal part of left G2 (ventral view); E, M, left G2 (dorsal view); F, N, distal part of left G2 (dorsal view); G, distal part of left G2 (dorsomesial view). Scales = 0.5 mm.

Figure 1. Mursia spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., color in life. A-E, male (23.9 ( 14.6 mm) (ZRC 2019.0492); F, ovigerous female (28.4 x 18.1 mm) (DABFUK). A, overall dorsal view; B, F, thoracic sternum and pleon; C, frontal view of cephalothorax and chelae; D, outer view of chelae; E, inner surface of right chela. Photographs: Chan T.-Y., P. K. L. Ng, Suvarna S. Devi.

Figure 2. A-D, Mursia bicristimanaAlcock and Anderson, 1894Alcock, A. and Anderson, A.R.S. 1894. An account of a recent collection of deep sea Crustacea from the Bay of Bengal and Laccadive Sea. Natural history notes from H.M. Indian Marine Survey Steamer “Investigator”. Series II, No. 14. Journal of the Asiatic Society of Bengal, 63: 141-185., young male (37.2 ( 19.6 mm) (ZRC 2017.0134), E-H, M. spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., male (23.9 ( 14.6 mm) (ZRC 2019.0492). A, E, overall dorsal view; B, F, dorsal view of carapace; C, G, dorsal view of right distal margin of merus of right cheliped; D, H, posterior carapace margin and right fourth ambulatory leg.

Figure 3. A-D, Mursia bicristimanaAlcock and Anderson, 1894Alcock, A. and Anderson, A.R.S. 1894. An account of a recent collection of deep sea Crustacea from the Bay of Bengal and Laccadive Sea. Natural history notes from H.M. Indian Marine Survey Steamer “Investigator”. Series II, No. 14. Journal of the Asiatic Society of Bengal, 63: 141-185., young male (37.2 ( 19.6 mm) (ZRC 2017.0134); E-H, M. spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., male (23.9 ( 14.6 mm) (ZRC 2019.0492). A, E, outer view of left chela; B, F, subventral view of left chela; C, G, pleon; D, H, pleonal somites 2 and 3.

Figure 4. A-G, Mursia bicristimanaAlcock and Anderson, 1894Alcock, A. and Anderson, A.R.S. 1894. An account of a recent collection of deep sea Crustacea from the Bay of Bengal and Laccadive Sea. Natural history notes from H.M. Indian Marine Survey Steamer “Investigator”. Series II, No. 14. Journal of the Asiatic Society of Bengal, 63: 141-185., young male (37.2 ( 19.6 mm) (ZRC 2017.0134); H-N, M. spiridonoviKarasawa, 2018Karasawa, H. 2018. Mursia spiridonovi, new name for Mursia minuta Spiridonov & Apel, 2007 preoccupied by Mursia minuta Karasawa, 1993 (Decapoda: Brachyura: Calappidae). Zootaxa, 4375: 587., male (23.9 ( 14.6 mm) (ZRC 2019.0492). A, H, left G1 (ventral view); B, I, distal part of left G1 (ventral view); C, J, distal part of left G1 (dorsal view); D, K, left G2 (ventral view); E, L, distal part of left G2 (ventral view); E, M, left G2 (dorsal view); F, N, distal part of left G2 (dorsal view); G, distal part of left G2 (dorsomesial view). Scales = 0.5 mm.

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Redescription of the shallow water calappid <i>Mursia spiridonovi</i> Karasawa, 2018 (Brachyura: Calappidae) from India

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[1] Corresponding author:
Suvarna S. Devi Suvarnaraja1995@gmail.com