Sains Malaysiana 38(3): 333-339(2009)

Morphological Characteristics of Pinna bicolor Gmelin and Pinna deltodes Menke

from the Seagrass Bed of Sungai Pulai, Johor, Peninsular Malaysia

(Ciri-ciri Morfologi Pinna bicolor Gmelin dan Pinna deltodes Menke di kawasan

Rumput Laut, Sungai Pulai, Johor, Semenanjung Malaysia)

Mohd Hanafi Idris¹*,  Aziz Arshad ², Japar Sidik Bujang¹, Mazlan Abd. Ghaffar³ & Siti Khalijah Daud¹

¹Faculty of Science, Universiti Putra Malaysia

43400 Serdang, Selangor, D.E. Malaysia

  ²Faculty of Agriculture, Universiti Putra Malaysia

43400 Serdang, Selangor, D.E. Malaysia

  ³Faculty of Science and Technology

Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, D.E. Malaysia

Received: 13 June 2008 / Accepted:25 September 2008

Abstract

Samples of Pinna bicolor Gmelin and Pinna deltodes Menke were collected from the seagrass bed of Sungai Pulai, covering Merambong shoal, Tanjung Adang shoal and Merambong Island of south western coast of Johor, Malaysia for morphological study from August 2005 to June 2006. It was observed that P. deltodes is associated with hard substratum and P. bicolor is associated with soft substratum in the study area. Physically there was no difference between P. bicolor and P. deltodes. The species were  identified on the basis of nine internal and external characteristics of the valves. The two species were found to be morphologically different on the basis of width of sulcus, distance between posterior adductor muscle to posterior dorsal nacreous layer, dorsal posterior margin length and shell width.

Keywords: Distribution; morphometric analysis; Pinna spp.; taxonomy

ABSTRAK

Sampel Pinna bicolor Gmelin dan Pinna deltodes Menke telah dipungut di kawasan rumput laut Sungai Pulai yang merangkumi Beting Merambong, Beting Tanjung Adang dan Pulau Merambong di perairan barat daya Johor, Malaysia bagi kajian morfologi bermula pada Ogos 2005 sehingga Jun 2006. Di kawasan kajian didapati P. deltodes hidup di kawasan yang berstruktur keras dan P. bicolor hidup di kawasan berstruktur lembut. Secara fizikal tidak terdapat perbezaan nyata di antara P. bicolor dan P. deltodes. Spesies ini dapat dikenal pasti melalui sembilan ciri-ciri luaran dan dalaman yang ada pada setiap cengkerang. Kedua-dua species ini dapat dibezakan secara morfologi melalui kelebaran alur tengah, jarak di antara otot pengatup posterior dengan penghujung belakang lapisan mutiara, panjang sisi posterior belakang dan kelebaran cengkerang.

Kata kunci: Analisis morphometrik; Pinna spp.; taburan;  taksonomi

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*Corresponding author; email: mhanafi@putra.upm.edu.my