I= SYSTEMATIC STUDY AND DISTRIBUTION OF PLANKTONIC SHRIMPS OF THE FAMILY SERGESTIDATE IN THE INDIAN OCEAN COLLECTED BY THE INTERNATIONAL INDIAN OCEAN EXPEDITION
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Title of Thesis
SYSTEMATIC STUDY AND DISTRIBUTION OF PLANKTONIC SHRIMPS OF THE FAMILY SERGESTIDATE IN THE INDIAN OCEAN COLLECTED BY THE INTERNATIONAL INDIAN OCEAN EXPEDITION

Author(s)
Farzana Yousuf
Institute/University/Department Details
Marine Reference Collection & Resource Centre/ University of Karachi
Session
2006
Subject
Zoology
Number of Pages
237
Keywords (Extracted from title, table of contents and abstract of thesis)
planktonic shrimps, family sergestidate, international indian ocean expedition, indian ocean, sergestes, sergia, decapoda, dendrobranchiata, sergestoidea dana, dendrobranchiata bate, sergestes h. milne edwards

Abstract
The present dissertation is based on the systematics and distribution of holopelagic shrimp belonging to the family Sergestidae and the genera Sergestes and Sergia studied from the International Indian Ocean Expedition (IIOE) material (1960-65) collected by research vessels of nine nations in the Indian Ocean. Twelve species assigned to the Sergestes and Sergia are identified, described in detail and illustrated. They are: Sergestes cf brevispinatus Judkins, 1978; S. curvatus Crosnier and Forest, 1973; S. cf edwardsii Kreyer,1855; S. hamifer Alcock and Anderson, 1894; 8.henseni (Ortmann, 1893); S. orientalis Hansen, 1919; S. paraseminudus Crosnier and Forest, 1973; S. semissis Burkenroad, 1940; S.stimulator Burkenroad, 1940; S. verpus Burkenroad, 1940 and Sergia potens Burkenroad, 1940 and S. umitakae Hashizume and Omori, 1995. Out of the twelve species Sergestes er. brevispinatus Judkins, 1978; S. et edwardsii krøyer, 1855 and S. orientalis Hansen, 1919 are reported new to the Indian Ocean. Further the presence of Sergestes hamifer Alcock and Anderson, 1894 and Sergia umitakae in the material at hand are first subsequent records of these species after their original descriptions from the Indian Ocean.

The higher systematics deals with the diagnosis of the Decapoda, Dendrobranchiata and Sergestidae. Keys are given to the genera and the species in IIOE material. Description of each genus includes literature review, list of the world species, synonymy, diagnosis and type species, while species description includes synonymy, material examined, diagnosis, description of adult male and female, juvenile male and female, size range, geographical distribution, and appropiate remarks where necessary .

In the distribution part of this study frequencies of occurrence and bathymetric distribution of Sergestes and Sergia in different regions of the Indian Ocean is attempted based on the samples captured during the International Indian Ocean Expedition (1960-1965). The total number of Sergestids specimens was collected' 2409 from 1071 stations by the following vessels; Anton Brunn (611),Argo (256), Conch(II), Discovery (270), Diamantina (188), Gascoyne (44), Kistna (361), Koyo Maru (46), Meteor ( 122), Natal (29), Oshoro Maru (177), Patanela (51), Pioneer (72), Varuna (122), Vitiaz (44), Zulun (70). Nine Sergestes species with a total number of 1827 were collected from 746 stations as follows: Anton Brunn (436), Argo (199), Conch (11), Discovery (190), Diamantina (121), Gascoyne (5), Kistna (358), Koyo Maru (6), Meteor ( 103), Natal (29), Oshoro Maru (107), Patanela (51), Pioneer (31), Varuna (89), Vitiaz (10) and Zulun (70).

Two Sergia species with a total numbers 636 specimens from 325 stations as follows: Anton Brunn (175), Argo (57), Conch (11), Diamantina (67), Discovery (80), Gascoyne (39), Kistna (3), Koyo Maru (40), Meteor (19), Oshoro Maru (70), Pioneer (41), Varuna (33) and Vitiaz (34).

The material has been further investigated to determine the average numbers of adult males, adult females, juvenile males and juvenile females (Figs. 86,87,88,89).

The numerical count shows that Sergestes semissis is the most abundant species. It comprised of653 adult males and females of the total 1827 Sergestes specimens. Sergestes verpus was the second most abundant species, comprising of 210 both adult males and females and juvenile males and females of the total 2463 sergestids. The population of Sergestes cf. edwardsii was sparse, only 2 specimens were present in samples. While Sergia potens comprises specimens of 257 adult males and females and juvenile males and females and S. umitakae 379 both adult males and females and juvenile males and females of total 636 specimens.

The prevalence of sergestids under study is discussed, using of maps, tables and histograms.

Besides the adults and juveniles three larval stages have also been identified in these samples: Protozoeae, Zoeae and Postlarvae. Their occurrence and abundance is traced at different 'depths and time of the day.

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S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
303.62 KB
2 1 Introduction 1-4
95.56 KB
3 2 Materials And Methods 5-10
644.48 KB
4 3 Systematic 11
5029.73 KB
  3.1 Diagnostic Characters Of The Suborder Dendrobranchiata Bate, 1888 11
  3.2 Diagnostic Characters Of The Superfamily Sergestoidea Dana, 1852 12
  3.3 Key To The Families Of The Sergestoidea Dana, 1852 13
  3.4 Diagnostic Characters Of The Family Sergestoidea Dana, 1852 14-15
  3.5 Key To The IIOE Genera Of The Family Sergestoidea Dana, 1852 16
  3.6 Review Of Literature On The IIOE Genera 17-28
  3.7 Diagnostic Characters Of The Genus Sergestes H. Milne Edwards, 1830 29-30
  3.8 List Of World Sergestes H. Milne Edwards, 1830 Species 31-33
  3.9 Key To The IIOE Species Of Genus Sergestes, H. Milne Edwards, 1983 34-36
  3.10 Description Of Sergestes Cf Brevispinatus Judkins, 1978 37-45
  3.11 Description Of Sergestes Curvatus Crosnier And Forest , 1973 46-52
  3.12 Description Of Sergestes Cf Edwardsii Krøyer, 1855 53-57
  3.13 Description Of Sergestes Hamifer Alcock And Anderson, 1894 58-62
  3.14 Description Of Sergestes Henseni (Ortmann, 1893) 63-71
  3.15 Description Of Sergestes Orientalis Hansen, 1919 72-81
  3.16 Description Of Sergestes Paraseminudus Crosnier And Forest , 1973 82-93
  3.17 Description Of Sergestes Semissis Burkenroad, 1940 94-118
  3.18 Description Of Sergestes Stimulator Burkenroad, 1940 119-126
  3.19 Description Of Sergestes Verpus Burkenroad, 1940 127-133
  3.20 Diagnostic Characters Of The Genus Sergia Stimpson, 1860 134-135
  3.21 List Of World Sergia Stimpson, 1860 Species 136-137
  3.22 Key To The IIOE Species Of Genus Sergia Stimpson, 1860 . 138
  3.23 Description Of Sergia Potens (Burkenroad, 1940) 139-152
  3.24 Description Of Umitakae Hashizume And Omori, 1995 153-168
5 4 Discussion 169-176
153.03 KB
6 5 Distributional Pattern Prevalence, % Abundance And Bathymetric 'Distribution Of Adults 177-185
1456.26 KB
  5.1 Geographical Distribution Of Individual Species In The Indian Ocean 186-193
7 6 Sergestid Larvae -Introduction, Distribution In IIOE
2018.85 KB
  6.1 Acknowledgements
  6.2 References