Uncharted biodiversity in the marine benthos: the void of the smallish with description of ten new Platyhelminth taxa from the well-studied North Sea

Table 4 Body size and measures of the male sclerotic apparatus in Postbursoplana species

	Distribution	Size at maturity	Lateral spines		Spines in central bundle
	Distribution	mm	Number	Size range (µm)	Number	Size range (µm)
P. noldti	North Sea	3.0–4.0	4	62–70	8	28–53
P. donoraticensis Meini, 2015	Mediterranean	1.6–1.8	4	52–70	6	46–55
P. fibulata Ax, 1956	Mediterranean	1.0	4	56–60	6	Largest 48
P. macromystax Lanfranchi, 1969	Mediterranean	0.8–1.2	4	42–47	6	35–40
P. minima Ax, 1956	NE Atlantic	0.4–0.5	2	35	8	Largest 35
P. parafibulata Lanfranchi, Melai and Meini, 2010	Mediterranean	1.2–1.4	4	55–73	6	52–62
P. pontica Ax, 1959	Black Sea	0.4–0.5	4	40–42	4	26–30
P. propontica Ax, 1959	Black Sea	0.7–0.8	4	45–50	4	38
P. tyrrhenica Lanfranchi, 1969	Mediterranean	1.5–1.6	4	44–48	4	38

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