A new species of Metaphrixus Nierstrasz & Brender à Brandis, 1931 (Isopoda: Bopyridae: Hemiarthrinae) associated with an Hippolytidae shrimp from Costa Rica Author Ribeiro, Felipe Bezerra Programa de Pós-Graduação em Ciências-Área Biologia Comparada, FFCLRP / USP. Author Horch, Amanda Porciuncula Author Terossi, Mariana Author Mantelatto, Fernando Luis Laboratório de Bioecologia e Sistemática de Crustáceos (LBSC), Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP), Universidade de São Paulo (USP), Ribeirão Preto, São Paulo, Brazil. & Programa de Pós-Graduação em Ciências-Área Biologia Comparada, FFCLRP / USP. text Zootaxa 2024 2024-09-02 5501 3 458 466 http://dx.doi.org/10.11646/zootaxa.5501.3.4 journal article 302300 10.11646/zootaxa.5501.3.4 9834d087-70df-4361-9923-230b06ee7501 1175-5326 13628210 94B987FA-60DB-46A4-A9FB-CFD74CD06334

TABLE 1. Comparison of taxonomically important morphological characters of the described species of Metaphrixus infesting caridean shrimps.

Character			Species
......continued on the next page
	Metaphrixus carolii	Metaphrixus intutus	Metaphrixus	Metaphrixus	Metaphrixus
	Nierstrasz & Brender	Bruce, 1966	rastriferis	setouchiensis	wehrtmanni sp. nov.
	à Brandis, 1931		Markham, 1990	Shimomura, Ohtsuka
				& Sakakihara, 2006
Eyes	present	present	present	absent	present
Head	nearly rectangular,	mushroom-shaped	quadrangular,	indistinctly separated	subquadrangular,
	longer than broad	and deeply set into	deeply set into	from pereon, frontal	deeply set into pereon,
		pereon	pereon	margin concave	fused posteriorly but
					not laterally
	Metaphrixus carolii	Metaphrixus intutus	Metaphrixus	Metaphrixus	Metaphrixus
	Nierstrasz & Brender	Bruce, 1966	rastriferis	setouchiensis	wehrtmanni sp. nov.
	à Brandis, 1931		Markham, 1990	Shimomura, Ohtsuka
				& Sakakihara, 2006
Antennule	unsegmented	indiscernible	3 articles	3 articles	2 articles
	extended flap
Antennae	unsegmented	3 articles	unsegmented flap	5 articles	unsegmented
	extended flap
Pereopods	7, 2	7, 2	7, 3 (third	7, 2	7, 3 (third reduced)
(concave side,			reduced)
convex side)
Pleomeres	5 pleomeres: first	5 pleomeres:	5 pleomeres: first	5 pleomeres:	5 pleomeres: first four
	four with lanceolate	first four with	four with lobate	1–2 distinct; 3–4	with uniramous ovate
	to oval uniramous	large and lobular	lateral plates on	indistinct, each with	lateral plates, fifth
	lateral plates	lateral plates, fifth	both sides, fifth	ventral tubercle, first	subtriangular
		subtriangular	subrectangular,	four with lanceolate
			straight across	to oval lateral plates;
			posterior margin	first two subequal in
				length, lateral plates
				2–4 decreasing in
				length
Pleopods	4 pairs of uniramous	4 pairs of	4 pairs of	4 pairs of uniramous	4 pairs of uniramous
	lanceolate to oval	uniramous finger-	uniramous	pleopods, lanceolate,	lanceolate pleopods,
	pleopods	like to lobular	foliate lanceolate	curved inwards and	curved downwards
		pleopods	pleopods	covered in scales
Uropods	absent (with	absent	absent	absent	absent
	variation, see
	Markham, 1985)
Host	Hippolyte	Palaemonella	Periclimenaeus	Hippolyte sp.	Hippolyte
	pleuracantha	rotumana	rastrifer Bruce,		obliquimanus Dana,
	(Stimpson,	(Borradaile, 1898);	1980		1852
	1871); Hippolyte	Cuapetes grandis
	obliquimanus Dana,	(Stimpson, 1860)
	1852
Mode of	ventral on pleon	dorsolateral on	ventral on pleon	ventral on pleon	ventral on pleon
infestation		pleon
Distribution	Atlantic Ocean: USA	Indo-West Pacific	Pacific Ocean:	Pacific Ocean: Japan	Atlantic Ocean: Costa
	(Florida), Mexico,	Ocean: Singapore,	New Caledonia		Rica
	Colombia, Virgin	Tanzania, Australia
	Islands
Reference	Nierstrasz &	Bruce (1966, 1986)	Markham (1990)	Shimomura et al.	Present study
	Brender à Brandis			(2006)
	(1931); Markham
	(1985, 1988);
Román-Contreras
	& Martínez-Mayén
	(2011)