New host record of pea crab Arcotheres purpureus (Alcock, 1900) (Crustacea: Decapoda: Pinnotheridae) with first description of male
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Arcotheres purpureus, a species of pea crab has been reported from the Red Sea, Maldives and Andaman Sea with no description of the male. According to existing literature the single host for this species is Ostrea.
The specimens examined were obtained from the dredge hauls.
In the present study we report Arcotheres purpureus for the first time from the coastal waters of mainland India. The specimens have been observed within the mantle cavity of a venerid bivalve Protapes gallus a new host record for this species. A description of the male specimen is also communicated herein for the first time.
Bivalve fisheries is an alternative livelihood option for the fishermen of this region. In this context the manifestation of Arcotheres purpureus, from a commercially viable species of bivalve such as Protapes gallus as well as its incidence in waters of mainland, India is a cause for concern necessitating further investigations.
KeywordsArcotheres purpureus First male record Subsistence fisheries Devi estuary, Odisha, India
- Reg. No.
- RZEV CB-36
Ravenshaw Zoology Environmental Crab Brachyura 36
- RZEV CB-37
Ravenshaw Zoology Environmental Crab Brachyura 37
Members of family Pinnotheridae of the brachyuran infraorder are nearly all symbionts of invertebrates, some are parasitic and others are commensals. Most of these species live inside bivalve molluscs or in the tubes or burrows of polychaetes and other marine organisms (McDermott, 2009). As globally ubiquitous symbionts of the marine environment, these pea crabs cause serious economic impact in the aquaculture production of several major bivalve species (Trottier and Jeffs, 2015).
Female specimens of Arcotheres purpureus (Alcock, 1900) from a bivalve Ostrea sp. (family Ostreidae) were first reported and described from waters of the Andaman sea. Later on, the species was reported from Maldives (Borradaile, 1903) and the Red sea as Pinnotheres purporeus (Vine, 1986). A compilation of Pinnotheroidea species with their hosts and sex (Theil et al., 2016) updated (Ng et al., 2008) indicates the occurrence of only the female specimen of Arcotheres purpureus from species of Ostrea in the Red sea, Gulf of Aden, Andaman and Maldive Islands (Schmitt et al., 1973). Thereafter, there have been no reports of the mentioned species.
The occurrence of both the sexes particularly males for the first time, from the coastal waters of mainland peninsular India (19°58′27.62″N, 086°20′20.38″E), Astarang, Odisha in the present study, is of interest as well as concern for a region known for subsistence fisheries as a source of livelihood. The objective of this communication is to place on record a species of pea crab Arcotheres purpureus hitherto not reported earlier from a new host bivalve Protapes gallus (Gmelin, 1791), of the family Veneridae used extensively by fishers for their livelihood. A description of the male not specified by Alcock, 1900 in the original description of the species and subsequent authors is provided herein for the first time.
Family Pinnotheridae De Haan 1833.
Genus Arcotheres Manning, 1993
Species purpureus Alcock, 1900
Type species: Pinnotheres purpureus Alcock, 1900, type locality: Andaman sea.
Morphometric measurements of male and female Arcotheres purpureus (Alcock, 1900)
Dactylus of cheliped
Propodus of cheliped
Carpus of cheliped
Merus of cheliped
Dactylus of 3rd leg
Dactylus of 4th leg
Description and diagnosis
Female (Fig. 3 a-f)
Male (Fig. 4 a-f)
Male deep purple while female pale red in fresh conditions. Ovigerous female in the host appeared cream orange. Female specimen hyaline in contrast to opaque male.
Found in loamy fine sand (sand 85.12%, silt 14.83%, clay 0.06%, organic matter 0.52%), salinity 29 psu. Depth 25–30 m.
Andaman Sea, Maldives and Red Sea.
Presently observed for the first time from mainland India.
The family Pinnotheridae includes 57 genera and 461 species worldwide (Davie and Türkay, 2009). A review of Pinnotheridae from India records 23 species (Dev Roy, 2014) and an additional new species Afropinnotheres ratnakara (Ng and Kumar, 2015). In a reappraisal of the taxonomy of species under this family, based on the structure of MXPs, asymmetrical length of third walking legs and P2-P5, Ng and Kumar (op. cit) moved Pinnotheres purpureus Alcock, 1900 to the genus Arcotheres Manning, 1993. The specimens under consideration in this study reveal similar features (MXP3 with ischium and merus imprecisely fused, propodus exceeding carpus in length. Dactylus of MXP3 hinged with propodus along ventral margin, sub hexagonal shape of the carapace) hence assigned to the genus Arcotheres.
The presence of Arcotheres purpureus within the mantle cavity of bivalve Protapes gallus could be a case of kleptoparasitism. Protapes gallus serving as a host for Arcotheres purpureus is a suspension feeder. Pea crabs are known to filter fine organic particles from the water and feed on the mucus produced by host gills as well as food particles accumulated in mucus (Kruczynski, 1975). Whether, feeding by Arcotheres purpureus adversely impacts bivalve host gills, and other physiological aspects needs to be examined as such effects could affect the bivalve fisheries of the region. In the immediate environs of Devi estuary, Astarang, Odisha, bivalve species particularly Protapes gallus have been used as meat for consumption, poultry feed, in hatcheries, as fertilizers and largely for the extraction of lime, popularly incorporated into the formulation of betel (Piper betle) quid chewed by the local population for its assumed stimulant and psychoactive effects (Gupta and Ray 2004). It is also utilised in the preparation of various tobacco based products as reported from other coastal regions of Odisha (Panda and Misra, 2007).
Molluscan fisheries as the kind practised in Astarang (handpicking from the intertidal mud flats, indigenous fishing methods using small country boats) has been a sustainable alternative livelihood option particularly during the fishing ban periods observed in coastal India. Worldwide, informal small-scale fisheries and other fisheries related activities are recognised as significant contributors to nutrition, food security, sustainable livelihood and poverty alleviation of developing countries (Staples et al., 2004). In this context, the occurrence of pea crab, Arcotheres purpureus as a kleptoparasite in a bivalve species used as a source of sustainable livelihood for the coastal population is a matter of concern. Further studies on host pea crab infestation needs to be carried out and suitable measures taken to control such outbreaks if found deleterious, as pinnotherids could have a negative commercial implication on aquaculture and fisheries of bivalves (Narvarte and Saiz, 2004) as well as the livelihood of fishers.
The present finding assumes significance with the incidence of Arcotheres purpureus for the first time from a new host bivalve Protapes gallus of the family Veneridae. A description of the male specimen is provided for the first time.
We thank Mr. Jeet Mohanty, Artist for the figures and Dr. B. Charan Kumar, DST Young Scientist, Andhra University for the maps. Thanks to the Principal CCF (Wildlife) and Chief Wildlife Warden, Government of Odisha, India for necessary permission. Laboratory facilities and logistic support provided by the Department of Zoology, Ravenshaw University, Cuttack, Odisha are appreciated. Due thanks to the reviewers for their valuable comments.
The authors gratefully acknowledge the financial support in the form of a project grant (260/OBB, dated 06th September, 2014) by Odisha Biodiversity Board, Bhubaneshwar.
Availability of data and materials
All data generated during this study are included in this article and the specimens are deposited in the Ravenshaw Zoology Environmental Science Laboratory museum with their Registration numbers.
BM, AN, SSR and BD carried out the field study. MKD identified the specimen. DR, BM, MKD, AVR and LP drafted the manuscript. LP and BM photographed the specimens. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Consent for publication
The authors declare that they have no competing interests.
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