Pycnocaris chagoae Bruce, 1972
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https://doi.org/ 10.5281/zenodo.205342 |
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https://doi.org/10.5281/zenodo.6185149 |
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https://treatment.plazi.org/id/03AB4256-E210-FFF7-D687-FA538EE4FB3E |
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Plazi |
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Pycnocaris chagoae Bruce, 1972 |
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Pycnocaris chagoae Bruce, 1972
( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 )
Pycnocaris chagoae Bruce, 1972: 50 –64, Figs. 1 View FIGURE 1 –7; Bruce, 1973: 108; Bruce, 1983: 107, Fig. 1 View FIGURE 1 .
Material examined. 1 ovigerous female (tl 8.3 mm, cl 4.2 mm, partly dissected), 1 subadult female (tl 6.2 mm, cl 2.6 mm) India, Lakshadweep, east side of Agatti Island, 10o50’39.75”N 72o11’16.23”E, rocky intertidal, on Labidodemas sp. leg. S. Prakash & M. Gopi, 1 February 2011 ( MBRC /ZSI M1-08).
Diagnosis. Small sized gnathophyllid shrimp, body stout, glabrous, slightly depressed, dorsally convex and ventrally flattened. Rostrum short, stout, without dentition, extending almost to the frontal margin of the second article of antennal peduncle ( Fig. 2 View FIGURE 2 A). Carapace broadened posteriorly; hepatic and supra-orbital spines absent; antennal spine small, acute, submarginal. Abdominal somites broad, flattened; pleura of the first three somites well developed. Eyes well developed, each with a small accessory pigment spot. Antennular peduncles stout, exceeding the rostrum by the two distal articles. Third maxilliped with an operculiform endopod; medial margin with dense overlapping setae ( Fig. 2 View FIGURE 2 B). First pereiopod moderately slender, palm of the chela stout, slightly compressed, tapering distally, fingers strongly compressed ( Fig. 2 View FIGURE 2 C); second pereiopods subequal, chela robust, smooth, palm slightly compressed ( Fig. 2 View FIGURE 2 D). Ambulatory legs robust; dactylus of third pereiopods stout, strongly compressed, biunguiculate; propodus somewhat compressed ( Fig. 2 View FIGURE 2 E). Telson narrow, tapering distally, with straight lateral margins; two pairs of marginal spines present on distal half; posterior margin with two pairs of spines, mesial spines stouter and longer ( Fig. 2 View FIGURE 2 F). Uropods without disterolateral spine and diaeresis ( Fig. 2 View FIGURE 2 G).
Color pattern. Creamy white or pale yellow, with bright red markings on the chelipeds and ambulatory pereiopods ( Figs. 1 View FIGURE 1 A–C), similar to the description in Bruce (1973).
Host. The Lakshadweep specimens were associated with Labidodemas sp., an individual of 19.3 cm total length, of whitish colour with brown podia tips ventrally ( Fig. 1 View FIGURE 1 A).
Distribution. Presently known only from the Indian Ocean: Chagos Archipelago; Diego Garcia Island; India: Lakshadweep ( Laccadive Archipelago).
Remarks. The discovery of Pycnocaris chagoae in Lakshadweep constitutes the first record of this species in India, and also the first record outside its type locality in the Chagos Archipelago. The present material agrees well with the description of Bruce (1972), except for the presence of two pairs of marginal spines on the distal half of the telson versus four pairs in the type material (cf. Bruce 1972, fig. 4e). The non-ovigerous specimen from Lakshadweep is tentatively considered as a subadult female because of the absence of an appendix masculina on the second pleopod (but see Bruce 1983 for alternative explanation).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Pycnocaris chagoae Bruce, 1972
| Prakash, Sanjeevi, Babu, Idrees, Gopi, Mohan, Kumar, Thipparamalai Thangappanpillai Ajith & Balasubramanian, Thangavel 2011 |
Pycnocaris chagoae
| Bruce 1983: 107 |
| Bruce 1973: 108 |
| Bruce 1972: 50 |