Scanning electron microscopic studies (SEM) revealed that the radula of Muricanthus kuesterianusresembled that of M. virgineusin most details. But there were some apparent differences. In M.kuesterianus rachidian tooth have a broad base than that of Muricanthus virgineus. The base of the median cusp was broad, short, stout and pointed straight towards the anterior end.The left lateral cusp elongated, sharp, slightly bent and pointed outwards and the right lateral cusp dorso ventrally flattened and the anterior end small, slightly pointed. In between the median and left lateral cusps, a sharp and pointed denticle is present where as the right laterals and median cups there is no denticle. The lateral teeth which are two in numbers flanked median rachidian.Keywords: Scanning Electron Microscope, Radula, Gastropoda, Muricidae, Muricanthus kuesteianus.
ResumenLos estudios de miscroscopía electrónica de transmisión (SEM) revelaron que la rádula de Muricanthus kuesterianus se asemejan a M. virgineus en varios detalles. Pero hubo algunas diferencias aparentes. En el diente raquídeo de M. kuesterianus se encontró una base más ancha que M. virgineus. La base de la cúspide media fue ancha, corta, robusta y punteada y apuntado directamente hacia el extremo anterior. La cúspide lateral izquierda, alargada, ligeramente doblada y punteada hacia el exterior, la cúspide lateral derecha es aplastada Sustainability, Agri, Food and Environmental Research, 2015, 3(1): 26-33.
The new occurrence of Three species of bivalves from Pinnidae family is recorded for the first time from Palk Bay area based on a live and dead shells collected from the Intertidal area . All the three species are under the family of Pinnidae, Pinna bicolor, Pinna deltodes and Pinna incurva . In seagrass bed of Thondi Coast, all the species of Pen shells Pinna bicolor, Pinna deltodes and Pinna incurva were embedded in muddy sand and found associated with seagrasses at inter-tidal area. It was also found buried in hard substratum associated with living zoanthids and soft coral. The collected specimens were identified as, (1) Pinna bicolor, (2) Pinna deltodes and (3) Pinna Incurva by using both morphometric and meristic characters. The paper described the taxonomic status and the description of the three species of bivalves collected from Palk Bay areas.
The present note consists of a single key for larval crustacean identification. Their classification is presented below following the classification of Edmondson (1959), Davis (1955) and Omeri and Ikeda (1984). Key to the copepods given here are modified from Kasturirangan (1963) and Newell
The species of Pugilina cochlidium (Linnaeus, 1758) and P. erecta (Vermeij & Raben, 2009) has been studied in the present study. The female can be differentiated from the male by the absence of the cephalic penis and a complicated genital aparatus visible through the mantle skirt in both the sexes. In other aspects of the external features of female are quite to males. In both species the digestive system was similar with few differences in structure between each other. It consists of buccal mass, proboscis, salivary glands, accessory salivary glands, oesophagus, stomach, intestine, rectum and anus. The nervous system in both P. cochlidium and P. erecta is constituted by six ganglia which forms the circumoesophgeal ganglionic ring. Among the neogastropods there is a similarity in the organization of the reproductive systems. The female reproductive system is more complicated than that of male. The sexes are separated in these two species. The gross morphology of the reproductive system of P. cochlidium and P. erecta was almost similar. The present study aims to describe the digestive system, nervous system and reproductive system of two gastropods species P. cochlidium and P. erecta.
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