Summary
The head, maxillo-sternal framework and endophragmal system ofNichollsia kashiense Chopra and Tiwari, are described and compared with those of other Isopods, especiallyLigia oceanica Linn.
The supra-antennal line is well developed and produced on each side into a triangular projection. Clypeus is assymmetrical and distinct from the frontal lamina. The occipital groove is incomplete and genal fossa is wanting. The presence of an incomplete maxillary sternite is an interesting feature of the maxillary somite. The tergal alæ are very vestigeal and the alar process and infero-lateral pterygoid process are wanting in the sternal alæ.
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Abbreviations
- al.b.:
-
alar bar
- ant. 1:
-
antennulary socket
- ant. 2:
-
antennary socket
- cl.:
-
clypeus
- dh.:
-
dorsal surface of head
- gn.:
-
articular surface of gnathopod
- gr. gen.:
-
genal groove
- lam. fr.:
-
frontal lamina
- lat. pr.:
-
lateral process of the supra antennary line
- lbr.:
-
labrum
- lin. ant.:
-
supra antennary line
- lin. ma.:
-
marginal line
- med. b.:
-
median bar
- mnd.:
-
mandible
- mx. 2:
-
articular socket of maxilla
- mxp.:
-
articular socket of maxilliped
- mxp. som.:
-
maxilliped somite
- occ. gr.:
-
occipital groove
- par.:
-
paragnath
- per. 1:
-
antero-ventral expansion of first peraeon segment
- plp.:
-
socket of mandibular palp
- po. mnd.:
-
post-mandibular region of head
- pr. ph.:
-
pharyngeal process
- pr. lat.:
-
lateral process of clypeus
- pty.:
-
maxillo-pterygoid process
- scl. mx. 1:
-
maxillulary sclerite
- scl. mx. 2:
-
maxillary sclerite
- sk. par.:
-
skeleton of paragnath
- st.:
-
sternite of maxilla
- st. al.:
-
sternal alæ
- st.ant.:
-
portion of the frontal lamina between the sockets of antennule and antenna
References
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Communicated by Dr. N. Kesava Panikkar,f.a.sc.
Published with the permission of the Director, Zoological Survey of India.
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Tiwari, K.K. The morphology ofNichollsia kashiense Chopra and Tiwari (Crustacea: Isopoda phreatoicoidea). Proc. Indian Acad. Sci. 35, 69–77 (1952). https://doi.org/10.1007/BF03050012
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DOI: https://doi.org/10.1007/BF03050012