Urothoe platydactyla   Rabindranath,  1971 (Amphipod)
Organism information awaits expert curation
Class: Malacostraca

Size: Length - 2 .3 mm

Cephalon longer than the combined length of first 2 peraeon segments ; ocular lobes rounded in front, eyes rounded and dorsally contiguous . Telson cleft nearly to base, lobes triangular, apically rounded, each with 2outer distal setules. Antenna 1 much shorter than antenna 2, sparsely setose, 1st peduncular segment shorter but nearly twice as wide as the 2nd, ventral margin fringed with fine hairs, dorsal border carrying 2 setae . 2nd Segment almost cylindrical, with tufts of setules on the outer surface, 3rd segment shorter than 1st and more slender than 2nd, flagellum 5-segmented and subequal in length to the 3rd peduncular segment . Accessory flagellum 3-segmented, about as long as the combined length of the first 2 segments of the primary flagellum . 2nd Antenna longer than the body, ultimate segment of the peduncle shorter than the penultimate, carrying a row of slender setae along the ventral margin, 4th segment with a few fascicles of strong spines dorsally . Flagellum very long, 24-segmented, distal segments longer . 1st Gnathopod stouter than 2nd, basis having the inner margin armed with a few long setae, ischium very small, merus roughly triangular, carpus very long, internally expanded, the expansion fringed with fine setules, distal half of inner border oblique, nearly unarmed and straight. Propodus more than half length of carpus, distal outer border with a few long setae, palm oblique, shorter than inner border, defined by a distinct spine, dactylus only a little shorter than propodus, slender, very slightly curved and with a tooth near the tip on the inside . Basis of 2nd gnathopod as long as the next 3 segments combined, carrying a large number of plumose setae along the inner border, outer border unarmed, carpus not as much expanded as in gnathopod 1, otherwise subsimilar, propodus slender three fourth shorter than carpus, palm transverse,minutely crenulate, with 2 setules at the defining angle and a short submarginal spine near the finger hinge . Dactylus feeble, nearly one third as long as propodus and gently curved . First 2 peraeopods subsimilar, coxa of 1st oblong, with a few setules at the lower hind corner, basis rather short, inner distal end with a plumose seta, ischium broader than long, also with a few plumose setae at the inner distal part, merus a little shorter than basis, setose along inner border, carpus rectangular, half as long as merus, inner margin with 3 spines and a few setae, propodus club-shaped, more than half as long as merus, distal expanded part with 7 flat spines, dactylus spine-like, a little shorter than propodus, inner margin denticulate . Basis of peraeopod 3 nearly as long as broad, externally bulged, ischium very small, merus twice as broad as long, carpus highly expanded, with 2 inner and 2 outer transverse rows of spines, propodus, subtriangular narrower than carpus, with 3 inner transverse rows of spines, outer part irregularly spiny, dactylus expanded and laminate, elliptic and apically pointed, with microscopic denticulation on the inner distal end. Peraeopods 4 and 5 with expanded basis, 4th a little larger than 5th, outer margin of its basis carrying a submarginal row of long, flat plumose setae, inner with a few pectinate spines, merus and carpus subequal in length, former stouter and with plumose setae on outer border, propodus slender and shorter than carpus, outer distal part produced and spine-like, distal border with a row of fine setules and a few stout spines . Dactylus as in peraeopod 1 . Basis of peraeopod 5 nearly naked, merus and carpus slender and shorter than in the 4th peraeopod, propodus subequal to carpus in length, inner border more spiny than in peraeopod 4, distal part of outer border serrate. Dactylus as in peraeopod 1 . Uropods 1 and 2 subsimilar ; 1st larger and more spiny, its peduncle shorter than the rami, upper margin serrate . Rami slender, unarmed, outer longer than the inner . Peduncle of 2nd uropod serrate only at the distal end of upper margin and with only one spine, outer ramus much longer than the inner . 3rd Uropod peduncle squarish, slightly more than I the length of the shorter inner ramus, distally with a few spines, rami foliaceous, inner shorter than basal segment of outer, distal part of outer margin of outer ramus with 2 spines . Apical segment of outer ramus about - as long as the basal segment.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Coastal


• Tamil Nadu, Thondi INDIA (Record: 06/2005-05/2006)
• Kerala, Kollam Port INDIA
• Tamil Nadu, Thondi INDIA (Record: 07/2005-06/2006)

Literature Source(s)
  • Serebiah, JS; Stella, C and Kadhar, AA (2008) Assessment of benthos in the subtidal area of Thondi (Palk Bay), southeast Tamilnadu- GIS based explication Proceedings of the national symposium on marine and coastal ecosystems 27-29, August 2007 Seaweed Research and Utilisation Seaweed Research and Utilisation Association, Marine Fisheries- 623 520, Tamilnadu, India 30 279-296 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Rabindranath, P (1971) Haustoriid Amphipods (Crustacea) from India Hydrobiologia Springer 38 521-539 Available at - http://dx.doi.org/10.1007/BF00036557
  • Anbuchezhian, R; Ravichandran, S; Serebiah, JS and Nobi, EP (2010) Geographic information system based assessment of benthic macrofauna in Thondi coastal area, south east coast of India World Journal of Zoology International Digital Organization for Scientific Information 5 (3) 172-182 Available at - www.idosi.org/wjz/wjz5(3)10/6.pdf

Page last updated on:2011-07-25

Back to Search