On the taxonomic status of Holothuria (Holothuria) tubulosa (s. s.) from the Algerian coast with the description of a new Mediterranean species, Holothuria (Holothuria) algeriensis n. sp. (Echinodermata: Holothuroidea: Holothuriidae) 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 Thandar, Ahmed S. School of Life Sciences, University of KwaZulu-Natal, P / Bag X 54001, Durban 4000, South Africa. Author Khodja, Ihcene text Zootaxa 2021 2021-06-03 4981 1 89 106 journal article 5927 10.11646/zootaxa.4981.1.4 fcb42055-1ae9-4705-b471-a6b9ab150e33 1175-5326 4897620 C86B7AAB-F7D3-4ED0-9C81-F141416F6118

TABLE 4. Morphological characters of the species of the genus Holothuria of the Algerian coast. mL = mean length.

	Holothuria tubulosa (s.s.)		Holothuria algeriensis n. sp.		Holothuria poli	Holothuria arguinensis	Holothuria stellati
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Specimen code	LPVCMRMS 2020.201	LPVCMRMS 2020.202	LPVCMRMS 2020.203	LPVCMRMS 2020.204	LPVCMRMS 2020.205	LPVCMRMS 2020.207	LPVCMRMS 2020.208
External morphological characters
Body shape	Cylindrical	Cylindrical	Sub-cylindrical	Sub-cylindrical	Cylindrical	Sub-cylindrical	Sub-cylindrical
Contracted length (cm)	16.50	11	18.50	15.50	13	13.50	16.50
Contracted width (cm)	3.20	4.20	4.50	4	3	5	6
Consistency of integument after preservation	Smooth	Smooth	Smooth	Smooth	Rough	Smooth	Smooth
Body wall thickness (cm)	0.60	0.20	0.30	0.40	0.40	0.20	0.70
Shape of trivium	Rounded	Rounded	± flattened	± flattened	Rounded	± flattened	± flattened
Colouration of trivium	Brown	Brown	Light gray	Light gray	Dark brown with light podia	Light brown	Brown to yellowish green
Colouration of pedicels (trivium)	Margin dark, whitish in middle	Margin dark, whitish in middle	Dark gray	Dark gray	Margin dark, light brown in middle	Margin dark brown, lighter in middle	Margin dark brown, lighter in middle
Shape of bivium	Rounded	Rounded	Arched	Arched	Rounded	Arched	Arched
Colouration of bivium	Dark brown	Dark brown	Dark gray/ brown	Dark gray/ brown	Dark brown with light areas	Dark brown	Brown (darker than H. arguinensis)
Disposition of papillae	Scattered	Scattered	Scattered	Scattered	In rows	In rows	In rows
Size of conical verrucosities of bivium (cm)	0.60	0.50	0.30	0.30	0.20	0.30	0.70
Form of verrucosities of bivium	Large protuberances	Small protuberances	Small protuberances	Small protuberances	Large protuberances	Large protuberances in rows	Large protuberances in rows
Position of anus	Ventral	Ventral	Terminal	Terminal	Terminal	Terminal	Terminal
Anal papillae	5 in series of 3 podia each	5 in series of 3 podia each	5 in series of 4 podia each	5 in series of 4 podia each	5 in series of 4 podia each	5 in series of 4 podia each	5 in series of 4 podia each
Number of tentacles	20	20	20	20	20	20	20
Internal morphological characters
Tentacular ampullae length	-	0.80 cm	Longer than those of H. tubu- losa (s.s)	Longer than those of H. tubulosa (s.s)	Very small	1.20 cm	1.50 cm
Polian vesicles	4 (1 in the middle, 1.80 cm and 3 on the left mL: 0.40 cm)	1 (1 cm)	1 (2 cm)	1 (3 cm)	1 (0.80 cm)	1 (1 cm)	1 (3 cm)
Stone canals	2 (1cm long on each side)	1 right (1.40 cm)	5 right (mL: 0.55 cm) and 3 left (mL: 0.30 cm)	3 right (mL: 0.50 cm) and 4 left (mL: 0.60 cm)	1 right (1.30 cm)	3 right (mL: 0.53 cm) and 1 left (0.90 cm)	5 right (mL: 0.60 cm) and 1 left (0.70 cm)
Longitudinal muscles / thickness	Attached / 0.90 cm	Attached / 0.80 cm	Attached / 1.40 cm	Attached / 1 cm	Attached / 0.60 cm	Attached / 0.70 cm	Attached / 1.40 cm