First record of Luidia atlantidea Madsen, 1950 (Echinodermata: Asteroidea Paxillosida: Luidiidae) in the Sidi-Medjdoub area-Mostaganem (West Algerian coast, Mediterranean Sea) Author Mezali, Karim Protection, Valorization of Coastal Marine Resources and Molecular Systematics Laboratory. Department of Marine Science and Aquaculture. Faculty of Natural Sciences and Life. Abdelhamid Ibn Badis University - Mostaganem, PO Box 227, Route nationale N ° 11, Kharrouba, 27000, Mostaganem, Algeria Author Khodja, Ihcene 0000-0003-3905-974X Protection, Valorization of Coastal Marine Resources and Molecular Systematics Laboratory. Department of Marine Science and Aquaculture. Faculty of Natural Sciences and Life. Abdelhamid Ibn Badis University - Mostaganem, PO Box 227, Route nationale N ° 11, Kharrouba, 27000, Mostaganem, Algeria & ihcene. khodja. etu @ univ-mosta. dz; https: // orcid. org / 0000 - 0003 - 3905 - 974 X ihcene.khodja.etu@univ-mosta.dz Author Benarous, Ahlam 0000-0001-5003-2041 Protection, Valorization of Coastal Marine Resources and Molecular Systematics Laboratory. Department of Marine Science and Aquaculture. Faculty of Natural Sciences and Life. Abdelhamid Ibn Badis University - Mostaganem, PO Box 227, Route nationale N ° 11, Kharrouba, 27000, Mostaganem, Algeria & ahlam. benarous @ univ-annaba. org; https: // orcid. org / 0000 - 0001 - 5003 - 2041 ahlam.benarous@univ-annaba.org Author Lebouazda, Zineb 0000-0001-5373-4532 Protection, Valorization of Coastal Marine Resources and Molecular Systematics Laboratory. Department of Marine Science and Aquaculture. Faculty of Natural Sciences and Life. Abdelhamid Ibn Badis University - Mostaganem, PO Box 227, Route nationale N ° 11, Kharrouba, 27000, Mostaganem, Algeria & zineb. lebouazda. etu @ univ-mosta. dz; https: // orcid. org / 0000 - 0001 - 5373 - 4532 zineb.lebouazda.etu@univ-mosta.dz Author Soualili, Dina Lila 0000-0002-9218-5182 Protection, Valorization of Coastal Marine Resources and Molecular Systematics Laboratory. Department of Marine Science and Aquaculture. Faculty of Natural Sciences and Life. Abdelhamid Ibn Badis University - Mostaganem, PO Box 227, Route nationale N ° 11, Kharrouba, 27000, Mostaganem, Algeria & dinalila. soualili @ univ-mosta. dz; https: // orcid. org / 0000 - 0002 - 9218 - 5182 dinalila.soualili@univ-mosta.dz text Zootaxa 2022 2022-03-31 5124 1 88 94 journal article 53157 10.11646/zootaxa.5124.1.7 93c38e0c-375a-47b4-a744-1ab8091e7418 1175-5326 6404820 011C45E8-8648-4D50-8547-39FD7E63D3BC

TABLE 1. Morphological comparison of species of the genus Luidia found in the Mediterranean Sea

	L. atlantidea	L. sarsii sarsii	L. ciliaris
Number of arms	5 (Clark & Downey 1992;	5 (Clark & Downey 1992)	7 (Koehler 1921)
	Present study)
Shape of	Small and rounded with 3 rows	Small and rounded (Clark &	Small and rounded (Clark &
abactinal paxillae	of short and thick spinelets.	Downey 1992)	Downey 1992)
	Central larger and shorter than
the peripheral ones (Clark &
Downey 1992; Present study)
Paxillar spinelets	Central markedly more coarse	Fine spinelets of fairly uni-	Variable in shape but fairly
	and squat than the slender pe-	form length, median paxil-	uniform in height, a large
	ripheral ones (Clark & Downey	lae mostly with only single	central spinelet and 10 or 12
	1992; Present study)	central spinelet, sometimes	smaller peripheral ones (Clark
		distinctly coarser and the	1982; Clark & Downey 1992)
		peripheral ones are also less
attenuated (Clark & Downey
1992)
Superomarginal	Slightly longer than broad but	Elongated (Clark & Downey	More or less elongated (Clark
paxillae	many (often alternate ones)	1992)	& Downey 1992)
almost square (Clark 1953; Clark
& Downey 1992; Present study)
Pedicellariae	Ventrolateral pedicellariae short	Elongated, narrow, and not tu-	Threevalved on some of the
	and truncated (Nataf & Cherbon-	mid, and have the outline of a	actinal plates but bivalved
	nier 1973; Present study)	somewhat produced isosceles	when on the inferomarginals
		triangle (Norman 1865)	(Clark & Downey 1992)
Inferomarginal	Uppermost inferomarginal	Uppermost inferomarginal	Uppermost inferomarginal
spine	spine usually of the same length	spine usually shorter than the	spine usually of the same
	or longer than the second one	second one (Clark 1953)	length or longer than the sec-
	(Clark 1953; Present study)		ond one (Clark 1953)